"use client";

import React, { useCallback, useEffect, useRef, useState } from "react";
import {
  Alert,
  Box,
  Button,
  Checkbox,
  Chip,
  CircularProgress,
  FormControlLabel,
  Paper,
  Stack,
  Tab,
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableRow,
  Tabs,
  TextField,
  Typography,
} from "@mui/material";
import { DateCalendar } from "@mui/x-date-pickers/DateCalendar";
import { LocalizationProvider } from "@mui/x-date-pickers/LocalizationProvider";
import { AdapterDayjs } from "@mui/x-date-pickers/AdapterDayjs";
import dayjs, { type Dayjs } from "dayjs";
import "dayjs/locale/zh-hk";
import {
  runStockLedgerFixAdj,
  fetchStockLedgerFixDay,
  fetchStockLedgerFixInventory,
  fetchStockLedgerFixInventoryScope,
  fetchStockLedgerFixLotScope,
  runStockLedgerFixDay,
  runStockLedgerFixRange,
  runStockLedgerFixInventory,
  runStockLedgerFixInventoryScope,
  runStockLedgerFixLotScope,
  searchStockLedgerFixInventory,
  searchStockLedgerFixLot,
  downloadStockLedgerFixSql,
  type StockLedgerFixCheckPart,
  type StockLedgerFixDayDetail,
  type StockLedgerFixInventoryPreview,
  type StockLedgerFixRunResponse,
  type StockLedgerFixScopeDetail,
  type StockLedgerFixSearchInventoryHit,
  type StockLedgerFixSearchLotHit,
} from "@/app/api/stockLedgerFix/client";

const FIRST_LEDGER_DAY = dayjs("2026-03-01");

const DAY_FIX_STEPS = ["2.1", "2.2", "2.3", "2.4", "2.5", "2.6"] as const;
type DayFixStep = (typeof DAY_FIX_STEPS)[number];
const ALL_DAY_STEPS: Record<DayFixStep, boolean> = {
  "2.1": true,
  "2.2": true,
  "2.3": true,
  "2.4": true,
  "2.5": true,
  "2.6": true,
};
const DAY_STEP_LABEL: Record<DayFixStep, string> = {
  "2.1": "2.1 lot",
  "2.2": "2.2 uom",
  "2.3": "2.3 inventoryId",
  "2.4": "2.4 lotQty",
  "2.5": "2.5 balance",
  "2.6": "2.6 日結",
};

/** Export SQL parts (aligned with fix steps + 1.0 / 2.7). */
const EXPORT_PARTS = ["1.0", "2.1", "2.3", "ledger", "2.6", "2.7"] as const;
type ExportPart = (typeof EXPORT_PARTS)[number];
const DEFAULT_EXPORT_PARTS: Record<ExportPart, boolean> = {
  "1.0": false,
  "2.1": false,
  "2.3": false,
  ledger: true,
  "2.6": true,
  "2.7": false,
};
const FULL_EXPORT_PARTS: Record<ExportPart, boolean> = {
  "1.0": true,
  "2.1": true,
  "2.3": true,
  ledger: true,
  "2.6": true,
  "2.7": true,
};
const EXPORT_PART_LABEL: Record<ExportPart, string> = {
  "1.0": "1.0 inventory",
  "2.1": "2.1 軟刪流水帳＋出倉列批號",
  "2.3": "2.3 inventoryId",
  ledger: "ledger lot/uom/lotQty/balance",
  "2.6": "2.6 日結",
  "2.7": "2.7 ADJ＋入出倉單＋調整記錄",
};

function selectedExportParts(flags: Record<ExportPart, boolean>): ExportPart[] {
  return EXPORT_PARTS.filter((p) => flags[p]);
}

function exportPartsPayload(flags: Record<ExportPart, boolean>): string[] | undefined {
  const selected = selectedExportParts(flags);
  if (selected.length === 0) return undefined;
  // Always send explicit list so backend does not fall back to legacy default alone
  return selected;
}

function selectedDaySteps(flags: Record<DayFixStep, boolean>): DayFixStep[] {
  return DAY_FIX_STEPS.filter((s) => flags[s]);
}

function stepsPayload(flags: Record<DayFixStep, boolean>): string[] | undefined {
  const selected = selectedDaySteps(flags);
  if (selected.length === 0 || selected.length === DAY_FIX_STEPS.length) return undefined;
  return selected;
}

function lotLineFixNote(res: StockLedgerFixRunResponse): string {
  const deleted = res.deletedUnlinkedLot ?? 0;
  const matched = res.existingLotMatch ?? 0;
  const mismatched = res.existingLotMismatch ?? 0;
  const blankOut = res.deletedBlankOutLine ?? 0;
  const alignedOut = res.alignedOutLine ?? 0;
  if (deleted === 0 && matched === 0 && mismatched === 0 && blankOut === 0 && alignedOut === 0) return "";
  return `、軟刪未連批號 ${deleted}、出倉列空而軟刪 ${blankOut}、出倉列已改跟帳本 ${alignedOut}、已有批號相符 ${matched}、不相符 ${mismatched}`;
}

function apiErrorMessage(e: unknown, fallback: string): string {
  if (e && typeof e === "object" && "response" in e) {
    const data = (e as { response?: { data?: unknown } }).response?.data;
    if (typeof data === "string" && data.trim()) {
      return data.trim().slice(0, 400);
    }
    if (data && typeof data === "object") {
      const msg = (data as { message?: unknown }).message;
      if (typeof msg === "string" && msg.trim()) {
        return msg.trim().slice(0, 400);
      }
    }
  }
  if (e instanceof Error && e.message) return e.message;
  return fallback;
}

function partVerdict(
  part: StockLedgerFixCheckPart,
): "correct" | "miss" | "incorrect" | "over-issue" | "can-fix" | "cannot-fix" {
  if (part.group === "canFix") {
    return part.miss > 0 || part.incorrect > 0 ? "can-fix" : "correct";
  }
  if (part.group === "cannotFix") {
    return part.miss > 0 || part.incorrect > 0 ? "cannot-fix" : "correct";
  }
  if (part.key === "overIssue") {
    if (part.incorrect > 0 || part.miss > 0) return "over-issue";
    return "correct";
  }
  if (part.incorrect > 0) return "incorrect";
  if (part.miss > 0) return "miss";
  if (part.key === "dayTable" && part.ok === 0) return "miss";
  return "correct";
}

function CheckPartsTable({ parts }: { parts: StockLedgerFixCheckPart[] }) {
  const field = parts.filter((p) => !p.group || p.group === "field");
  const canFix = parts.filter(
    (p) => p.group === "canFix" && p.miss + p.incorrect > 0,
  );
  const cannotFix = parts.filter(
    (p) => p.group === "cannotFix" && p.miss + p.incorrect > 0,
  );
  const renderRows = (rows: StockLedgerFixCheckPart[]) =>
    rows.map((p) => {
      const v = partVerdict(p);
      return (
        <TableRow key={p.key}>
          <TableCell>{p.label}</TableCell>
          <TableCell>
            <Chip
              size="small"
              label={
                v === "correct"
                  ? "correct"
                  : v === "miss"
                    ? "miss"
                    : v === "over-issue"
                      ? "over-issue"
                      : v === "can-fix"
                        ? "可修"
                        : v === "cannot-fix"
                          ? "不能修"
                          : "incorrect"
              }
              color={
                v === "correct"
                  ? "success"
                  : v === "miss" || v === "over-issue" || v === "can-fix"
                    ? "warning"
                    : "error"
              }
            />
          </TableCell>
          <TableCell align="right">{p.ok}</TableCell>
          <TableCell align="right">{p.miss}</TableCell>
          <TableCell align="right">{p.incorrect}</TableCell>
        </TableRow>
      );
    });
  return (
    <Stack spacing={2}>
      <Table size="small">
        <TableHead>
          <TableRow>
            <TableCell>項目</TableCell>
            <TableCell>狀態</TableCell>
            <TableCell align="right">正確</TableCell>
            <TableCell align="right">缺</TableCell>
            <TableCell align="right">不正確</TableCell>
          </TableRow>
        </TableHead>
        <TableBody>{renderRows(field)}</TableBody>
      </Table>
      {canFix.length > 0 && (
        <>
          <Typography variant="subtitle2">可自動修（按 Fix 會處理）</Typography>
          <Table size="small">
            <TableHead>
              <TableRow>
                <TableCell>原因</TableCell>
                <TableCell>狀態</TableCell>
                <TableCell align="right">正確</TableCell>
                <TableCell align="right">列數</TableCell>
                <TableCell align="right">—</TableCell>
              </TableRow>
            </TableHead>
            <TableBody>{renderRows(canFix)}</TableBody>
          </Table>
        </>
      )}
      {cannotFix.length > 0 && (
        <>
          <Typography variant="subtitle2">
            不能自動修（Fix 不會消；舊 TKE 開新批／真超發／沒有 lot 來源）
          </Typography>
          <Table size="small">
            <TableHead>
              <TableRow>
                <TableCell>原因</TableCell>
                <TableCell>狀態</TableCell>
                <TableCell align="right">正確</TableCell>
                <TableCell align="right">—</TableCell>
                <TableCell align="right">列數</TableCell>
              </TableRow>
            </TableHead>
            <TableBody>{renderRows(cannotFix)}</TableBody>
          </Table>
        </>
      )}
    </Stack>
  );
}

const StockLedgerFixPageClient: React.FC = () => {
  const [tab, setTab] = useState<"day" | "inventory" | "lot">("day");
  const [selected, setSelected] = useState<Dayjs | null>(() =>
    dayjs().subtract(1, "day"),
  );
  const [detail, setDetail] = useState<StockLedgerFixDayDetail | null>(null);
  const [detailLoading, setDetailLoading] = useState(false);
  const [detailError, setDetailError] = useState<string | null>(null);
  const [fixing, setFixing] = useState(false);
  const [fixError, setFixError] = useState<string | null>(null);
  const [fixMessage, setFixMessage] = useState<string | null>(null);
  const detailInFlight = useRef(false);
  const fixInFlight = useRef(false);
  const inventoryLoadInFlight = useRef(false);
  const inventoryRunInFlight = useRef(false);
  const searchInFlight = useRef(false);
  const scopeInFlight = useRef(false);
  const exportInFlight = useRef(false);
  const [chainFrom, setChainFrom] = useState("2026-03-15");
  const [chainTo, setChainTo] = useState(() =>
    dayjs().subtract(1, "day").format("YYYY-MM-DD"),
  );
  const [chainRunning, setChainRunning] = useState(false);
  const [chainProgress, setChainProgress] = useState<string | null>(null);
  const [daySteps, setDaySteps] = useState<Record<DayFixStep, boolean>>(ALL_DAY_STEPS);
  const [exportFrom, setExportFrom] = useState("2026-03-15");
  const [exportTo, setExportTo] = useState(() =>
    dayjs().subtract(1, "day").format("YYYY-MM-DD"),
  );
  const [exportParts, setExportParts] =
    useState<Record<ExportPart, boolean>>(DEFAULT_EXPORT_PARTS);
  const [exporting, setExporting] = useState(false);
  const [exportError, setExportError] = useState<string | null>(null);
  const [inventoryPreview, setInventoryPreview] =
    useState<StockLedgerFixInventoryPreview | null>(null);
  const [inventoryLoading, setInventoryLoading] = useState(false);
  const [inventoryRunning, setInventoryRunning] = useState(false);
  const [inventoryError, setInventoryError] = useState<string | null>(null);
  const [inventoryMessage, setInventoryMessage] = useState<string | null>(null);
  const adjRunInFlight = useRef(false);
  const [adjRunning, setAdjRunning] = useState(false);
  const [adjError, setAdjError] = useState<string | null>(null);
  const [adjMessage, setAdjMessage] = useState<string | null>(null);
  /** Default yesterday; freeze-night dump set to today so ADJ lands on dump day. */
  const [adjDate, setAdjDate] = useState(() =>
    dayjs().subtract(1, "day").format("YYYY-MM-DD"),
  );
  const [invQuery, setInvQuery] = useState("");
  const [lotQuery, setLotQuery] = useState("");
  const [invHits, setInvHits] = useState<StockLedgerFixSearchInventoryHit[]>([]);
  const [lotHits, setLotHits] = useState<StockLedgerFixSearchLotHit[]>([]);
  const [searchError, setSearchError] = useState<string | null>(null);
  const [searching, setSearching] = useState(false);
  const [scope, setScope] = useState<StockLedgerFixScopeDetail | null>(null);
  const [scopeLoading, setScopeLoading] = useState(false);

  const loadInventory = useCallback(async () => {
    if (inventoryLoadInFlight.current) return;
    inventoryLoadInFlight.current = true;
    setInventoryLoading(true);
    setInventoryError(null);
    try {
      const data = await fetchStockLedgerFixInventory();
      setInventoryPreview(data);
    } catch (e) {
      console.error(e);
      setInventoryError("無法載入 inventory 1.0 預覽（需要 ADMIN / TESTING）");
      setInventoryPreview(null);
    } finally {
      setInventoryLoading(false);
      inventoryLoadInFlight.current = false;
    }
  }, []);

  const loadDay = useCallback(async (date: string) => {
    if (detailInFlight.current) return;
    detailInFlight.current = true;
    setDetailLoading(true);
    setDetailError(null);
    setFixMessage(null);
    try {
      const data = await fetchStockLedgerFixDay(date);
      setDetail(data);
    } catch (e) {
      console.error(e);
      setDetailError("無法載入當日檢查");
      setDetail(null);
    } finally {
      setDetailLoading(false);
      detailInFlight.current = false;
    }
  }, []);

  useEffect(() => {
    void loadInventory();
  }, [loadInventory]);

  useEffect(() => {
    if (tab === "day" && selected) {
      void loadDay(selected.format("YYYY-MM-DD"));
    }
  }, [selected, loadDay, tab]);

  const onFixDay = async () => {
    if (!selected || fixInFlight.current) return;
    const date = selected.format("YYYY-MM-DD");
    if (selected.isAfter(dayjs(), "day")) {
      setFixError("不能修未來日期");
      return;
    }
    const picked = selectedDaySteps(daySteps);
    if (picked.length === 0) {
      setFixError("請至少勾一個步驟（預設全跑 2.1–2.6）");
      return;
    }
    const steps = stepsPayload(daySteps);
    const stepLabel = steps?.join("、") ?? "全部 2.1–2.6";
    if (steps) {
      const ok = window.confirm(
        `只跑 ${stepLabel}（${date}）。未勾的步驟不會重算。確定？`,
      );
      if (!ok) return;
    }
    fixInFlight.current = true;
    setFixing(true);
    setFixError(null);
    setFixMessage(null);
    try {
      const res = await runStockLedgerFixDay(date, steps);
      setFixMessage(
        `已修 ${res.date}（${stepLabel}）：lot ${res.filledLotLineId}、uom ${res.filledUomId}、inventory ${res.filledInventoryId}、lotQty ${res.filledLotQty}、balance ${res.filledBalance}、日結 ${res.dayRowsWritten}${lotLineFixNote(res)}`,
      );
      await loadDay(date);
    } catch (e) {
      console.error(e);
      setFixError(apiErrorMessage(e, "修復失敗"));
    } finally {
      setFixing(false);
      fixInFlight.current = false;
    }
  };

  const onInventory = async () => {
    if (inventoryRunInFlight.current) return;
    const ok = window.confirm(
      "方案 A：保留現有 inventory.id；從 lot 回填 stockUomId（舊 uomId 是 stock 則改回 base）；補缺 (itemId, stockUomId)；用 lot 的 in−out 重算 onHand／unavailable。不寫 onHoldQty、不改 inventory_lot_line。確定執行？",
    );
    if (!ok) return;
    inventoryRunInFlight.current = true;
    setInventoryRunning(true);
    setInventoryError(null);
    setInventoryMessage(null);
    try {
      const res = await runStockLedgerFixInventory();
      setInventoryMessage(
        `inventory 1.0 完成：回填 stockUomId ${res.patchedStockUomId} 列、新增 ${res.inserted} 列、殘列 deleted ${res.orphansDeleted ?? 0}、重算 ${res.updated} 列、之後仍缺 UOM ${res.missingUomPairsAfter}、仍 NULL stockUomId ${res.nullStockUomIdAfter}`,
      );
      await loadInventory();
    } catch (e) {
      console.error(e);
      setInventoryError(apiErrorMessage(e, "inventory 1.0 失敗"));
    } finally {
      setInventoryRunning(false);
      inventoryRunInFlight.current = false;
    }
  };

  const onAdjApply = async () => {
    if (adjRunInFlight.current) return;
    const d = adjDate.trim();
    if (!d) {
      setAdjError("請填 ADJ 日期");
      return;
    }
    if (d > dayjs().format("YYYY-MM-DD")) {
      setAdjError("ADJ 日期不能是未來");
      return;
    }
    const ok = window.confirm(
      `會在 ${d} 對最後餘額不等於 onHandQty 的庫存桶各寫一筆 ADJ（入或出），掛在既有 lot 上，並寫入庫存調整記錄。不改 lot line、不改 inventory。已對齊的桶不會再寫；缺調整記錄的舊 ADJ 會補上。確定？`,
    );
    if (!ok) return;
    adjRunInFlight.current = true;
    setAdjRunning(true);
    setAdjError(null);
    setAdjMessage(null);
    try {
      const res = await runStockLedgerFixAdj(d);
      setAdjMessage(
        `ADJ ${res.adjDate}：入 ${res.insertedIn}、出 ${res.insertedOut}、調整記錄 ${res.adjustmentRecords ?? 0}、lotQty ${res.filledLotQty}、balance ${res.filledBalance}、日結 ${res.dayRowsWritten}`,
      );
    } catch (e) {
      console.error(e);
      setAdjError(apiErrorMessage(e, "ADJ 對齊失敗"));
    } finally {
      setAdjRunning(false);
      adjRunInFlight.current = false;
    }
  };

  const onSearchInventory = async () => {
    if (searchInFlight.current || !invQuery.trim()) return;
    searchInFlight.current = true;
    setSearching(true);
    setSearchError(null);
    try {
      const hits = await searchStockLedgerFixInventory(invQuery.trim());
      setInvHits(hits);
      setScope(null);
    } catch (e) {
      console.error(e);
      setSearchError(apiErrorMessage(e, "搜尋失敗"));
    } finally {
      setSearching(false);
      searchInFlight.current = false;
    }
  };

  const onSearchLot = async () => {
    if (searchInFlight.current || !lotQuery.trim()) return;
    searchInFlight.current = true;
    setSearching(true);
    setSearchError(null);
    try {
      const hits = await searchStockLedgerFixLot(lotQuery.trim());
      setLotHits(hits);
      setScope(null);
    } catch (e) {
      console.error(e);
      setSearchError(apiErrorMessage(e, "搜尋失敗"));
    } finally {
      setSearching(false);
      searchInFlight.current = false;
    }
  };

  const loadInventoryScope = async (id: number) => {
    if (scopeInFlight.current) return;
    scopeInFlight.current = true;
    setScopeLoading(true);
    setFixError(null);
    setFixMessage(null);
    try {
      setScope(await fetchStockLedgerFixInventoryScope(id));
    } catch (e) {
      console.error(e);
      setFixError(apiErrorMessage(e, "無法載入 inventory"));
      setScope(null);
    } finally {
      setScopeLoading(false);
      scopeInFlight.current = false;
    }
  };

  const loadLotScope = async (id: number) => {
    if (scopeInFlight.current) return;
    scopeInFlight.current = true;
    setScopeLoading(true);
    setFixError(null);
    setFixMessage(null);
    try {
      setScope(await fetchStockLedgerFixLotScope(id));
    } catch (e) {
      console.error(e);
      setFixError(apiErrorMessage(e, "無法載入 lot"));
      setScope(null);
    } finally {
      setScopeLoading(false);
      scopeInFlight.current = false;
    }
  };

  const onFixInventoryScope = async () => {
    if (!scope || scope.kind !== "inventory" || fixInFlight.current) return;
    const ok = window.confirm(
      "會重算這顆 inventory 到今天為止全部 ledger 的 lotQty、日結，以及這顆料的 balance。確定？",
    );
    if (!ok) return;
    fixInFlight.current = true;
    setFixing(true);
    setFixError(null);
    setFixMessage(null);
    try {
      const res = await runStockLedgerFixInventoryScope(scope.id);
      setFixMessage(
        `已修 inventory ${scope.id}：lot ${res.filledLotLineId}、uom ${res.filledUomId}、inventory ${res.filledInventoryId}、lotQty ${res.filledLotQty}、balance ${res.filledBalance}、日結 ${res.dayRowsWritten}${lotLineFixNote(res)}`,
      );
      await loadInventoryScope(scope.id);
    } catch (e) {
      console.error(e);
      setFixError(apiErrorMessage(e, "修復失敗"));
    } finally {
      setFixing(false);
      fixInFlight.current = false;
    }
  };

  const onFixLotScope = async () => {
    if (!scope || scope.kind !== "lot" || fixInFlight.current) return;
    const ok = window.confirm(
      "只修這張 lot 的 lotQty 與日結，不會改整顆料的 balance。確定？",
    );
    if (!ok) return;
    fixInFlight.current = true;
    setFixing(true);
    setFixError(null);
    setFixMessage(null);
    try {
      const res = await runStockLedgerFixLotScope(scope.id);
      setFixMessage(
        `已修 lot ${scope.id}：lot ${res.filledLotLineId}、uom ${res.filledUomId}、inventory ${res.filledInventoryId}、lotQty ${res.filledLotQty}、日結 ${res.dayRowsWritten}${lotLineFixNote(res)}`,
      );
      await loadLotScope(scope.id);
    } catch (e) {
      console.error(e);
      setFixError(apiErrorMessage(e, "修復失敗"));
    } finally {
      setFixing(false);
      fixInFlight.current = false;
    }
  };

  const canFixDay = Boolean(selected && !selected.isAfter(dayjs(), "day"));

  const onFixDayRange = async () => {
    if (fixInFlight.current) return;
    const from = chainFrom.trim();
    const to = chainTo.trim();
    const today = dayjs().format("YYYY-MM-DD");
    if (!from || !to) {
      setFixError("請填區間修 from / to");
      return;
    }
    if (to < from) {
      setFixError("to 必須 ≥ from");
      return;
    }
    if (from < FIRST_LEDGER_DAY.format("YYYY-MM-DD")) {
      setFixError(`from 不能早於 ${FIRST_LEDGER_DAY.format("YYYY-MM-DD")}`);
      return;
    }
    if (to > today) {
      setFixError("不能修未來日期（今天可以，給 freeze dump 夜修）");
      return;
    }
    const picked = selectedDaySteps(daySteps);
    if (picked.length === 0) {
      setFixError("請至少勾一個步驟（預設全跑 2.1–2.6）");
      return;
    }
    const steps = stepsPayload(daySteps);
    const stepLabel = steps?.join("、") ?? "全部 2.1–2.6";
    const ok = window.confirm(
      `一次修 ${from} → ${to}（步驟：${stepLabel}）。改為逐日跑（每天 commit）。中途失敗時已跑完的天會留下。確定？`,
    );
    if (!ok) return;

    fixInFlight.current = true;
    setChainRunning(true);
    setFixing(true);
    setFixError(null);
    setFixMessage(null);
    setChainProgress(`區間修 ${from} → ${to}（${stepLabel}）進行中…`);
    try {
      const res = await runStockLedgerFixRange(from, to, steps);
      setFixMessage(
        `區間修完成 ${res.date}（${stepLabel}）：lot ${res.filledLotLineId}、uom ${res.filledUomId}、inventory ${res.filledInventoryId}、lotQty ${res.filledLotQty}、balance ${res.filledBalance}、日結 ${res.dayRowsWritten}${lotLineFixNote(res)}`,
      );
      setSelected(dayjs(to));
      setChainProgress(null);
    } catch (e) {
      console.error(e);
      setFixError(apiErrorMessage(e, "區間修失敗"));
    } finally {
      setFixing(false);
      setChainRunning(false);
      fixInFlight.current = false;
    }
  };

  const onExportSql = async () => {
    if (exportInFlight.current) return;
    const from = exportFrom.trim();
    const to = exportTo.trim();
    if (!from || !to) {
      setExportError("請填 from / to");
      return;
    }
    if (to < from) {
      setExportError("to 必須 ≥ from");
      return;
    }
    const picked = selectedExportParts(exportParts);
    if (picked.length === 0) {
      setExportError("請至少勾一個匯出項目");
      return;
    }
    if (exportParts["2.3"] && !exportParts["1.0"]) {
      const ok = window.confirm(
        "已勾 2.3 inventoryId 但未勾 1.0 inventory：正式庫若缺新 id，UPDATE 會指到空列。建議一併勾 1.0（完整檔）。仍要匯出？",
      );
      if (!ok) return;
    }
    const parts = exportPartsPayload(exportParts);
    exportInFlight.current = true;
    setExporting(true);
    setExportError(null);
    try {
      await downloadStockLedgerFixSql(from, to, parts);
    } catch (e) {
      console.error(e);
      const data = (e as { response?: { data?: unknown } })?.response?.data;
      if (data instanceof Blob) {
        try {
          const text = (await data.text()).trim().slice(0, 400);
          setExportError(text || "匯出失敗");
        } catch {
          setExportError(apiErrorMessage(e, "匯出失敗"));
        }
      } else {
        setExportError(apiErrorMessage(e, "匯出失敗"));
      }
    } finally {
      setExporting(false);
      exportInFlight.current = false;
    }
  };

  return (
    <Stack spacing={3}>
      <Paper sx={{ p: 2 }}>
        <Stack spacing={1.5}>
          <Typography variant="h6">1.0 inventory（方案 A）</Typography>
          <Typography variant="body2" color="text.secondary">
            保留現有 id；lot 有、inventory 沒有的 UOM 會新增；onHand = Σ(in−out) 按
            item+UOM。沒有 lot 的列會變成 0。同一料多顆舊列時只留一顆 stock UOM
            桶，其餘 deleted=1。請在進出倉暫停時執行，再逐日 Fix。
          </Typography>
          {inventoryError && <Alert severity="error">{inventoryError}</Alert>}
          {inventoryMessage && (
            <Alert severity="success">{inventoryMessage}</Alert>
          )}
          {inventoryLoading && !inventoryPreview && <CircularProgress size={24} />}
          {inventoryPreview && (
            <Typography variant="body2">
              現有 inventory {inventoryPreview.inventoryRows} 列；lot 的
              item+UOM {inventoryPreview.lotUomPairs} 組；缺{" "}
              {inventoryPreview.missingUomPairs} 組；stockUomId 仍 NULL{" "}
              {inventoryPreview.nullStockUomId} 列。
            </Typography>
          )}
          <Box>
            <Button
              variant="contained"
              color="warning"
              disabled={inventoryRunning || inventoryLoading}
              onClick={() => void onInventory()}
            >
              {inventoryRunning ? "重算中…" : "Run inventory 1.0 (A)"}
            </Button>
          </Box>
        </Stack>
      </Paper>

      <Paper sx={{ p: 2 }}>
        <Stack spacing={1.5}>
          <Typography variant="h6">2.7 ADJ：對齊最後餘額與 onHandQty</Typography>
          <Typography variant="body2" color="text.secondary">
            選 ADJ 日期後直接執行。預設昨天；freeze dump 夜可選今天。最後餘額低於 onHandQty
            的桶補一筆入倉 ADJ，高於 onHandQty 的桶補一筆出倉 ADJ，掛在既有 lot 上。不改 lot
            line、不改 inventory。一次執行共用一張入倉單、一張出倉單；已對齊的桶再跑不會再寫。
          </Typography>
          <Stack direction="row" spacing={1} alignItems="center" flexWrap="wrap" useFlexGap>
            <TextField
              size="small"
              type="date"
              label="ADJ 日期"
              value={adjDate}
              onChange={(e) => {
                setAdjDate(e.target.value);
                setAdjMessage(null);
              }}
              disabled={adjRunning}
              InputLabelProps={{ shrink: true }}
              inputProps={{ max: dayjs().format("YYYY-MM-DD") }}
            />
            <Button
              size="small"
              disabled={adjRunning}
              onClick={() => {
                setAdjDate(dayjs().format("YYYY-MM-DD"));
                setAdjMessage(null);
              }}
            >
              今天（freeze 夜）
            </Button>
            <Button
              size="small"
              disabled={adjRunning}
              onClick={() => {
                setAdjDate(dayjs().subtract(1, "day").format("YYYY-MM-DD"));
                setAdjMessage(null);
              }}
            >
              昨天
            </Button>
          </Stack>
          {adjError && <Alert severity="error">{adjError}</Alert>}
          {adjMessage && <Alert severity="success">{adjMessage}</Alert>}
          {adjRunning && <CircularProgress size={24} />}
          <Stack direction="row" spacing={1}>
            <Button
              variant="contained"
              color="warning"
              disabled={adjRunning}
              onClick={() => void onAdjApply()}
            >
              {adjRunning ? "寫入 ADJ 中…" : "Apply ADJ"}
            </Button>
          </Stack>
        </Stack>
      </Paper>

      <Paper sx={{ px: 2, pt: 1 }}>
        <Tabs
          value={tab}
          onChange={(_, v: "day" | "inventory" | "lot") => {
            setTab(v);
            setFixError(null);
            setFixMessage(null);
            setSearchError(null);
          }}
        >
          <Tab label="日曆" value="day" />
          <Tab label="Inventory" value="inventory" />
          <Tab label="Lot line" value="lot" />
        </Tabs>
      </Paper>

      {tab === "day" && (
        <Stack direction={{ xs: "column", md: "row" }} spacing={3} alignItems="flex-start">
          <Paper sx={{ p: 1 }}>
            <LocalizationProvider dateAdapter={AdapterDayjs} adapterLocale="zh-hk">
              <DateCalendar
                value={selected}
                onChange={(v) => setSelected(v)}
                views={["year", "month", "day"]}
                openTo="day"
                minDate={FIRST_LEDGER_DAY}
                maxDate={dayjs()}
              />
            </LocalizationProvider>
            <Typography variant="caption" color="text.secondary" sx={{ px: 2, pb: 1, display: "block" }}>
              點左上標題可先選年再選月。換月不會查資料；點某一天才檢查當天。今天可修（freeze dump 夜）。
            </Typography>
          </Paper>

          <Paper sx={{ p: 2, flex: 1, minWidth: 0, width: "100%" }}>
            <Stack spacing={2}>
              <Typography variant="h6">
                {selected ? selected.format("YYYY-MM-DD") : "請選日期"}
              </Typography>
              {detailError && <Alert severity="error">{detailError}</Alert>}
              {fixError && <Alert severity="error">{fixError}</Alert>}
              {fixMessage && <Alert severity="success">{fixMessage}</Alert>}
              {chainProgress && <Alert severity="info">{chainProgress}</Alert>}
              {detailLoading && <CircularProgress size={24} />}
              {detail && !detailLoading && (
                <>
                  <Typography variant="body2" color="text.secondary">
                    當天 ledger {detail.cnt} 列
                  </Typography>
                  <CheckPartsTable parts={detail.parts} />
                </>
              )}
              <Box>
                <Typography variant="subtitle2" sx={{ mb: 0.5 }}>
                  步驟（預設全跑）
                </Typography>
                <Typography variant="body2" color="text.secondary" sx={{ mb: 0.5 }}>
                  套 SQL 後只改 inventoryId 時只勾 2.3。只跑部分時未勾的不會重算。
                </Typography>
                <Stack direction="row" spacing={0} flexWrap="wrap" useFlexGap>
                  {DAY_FIX_STEPS.map((step) => (
                    <FormControlLabel
                      key={step}
                      control={
                        <Checkbox
                          size="small"
                          checked={daySteps[step]}
                          disabled={fixing || chainRunning}
                          onChange={(_, checked) =>
                            setDaySteps((prev) => ({ ...prev, [step]: checked }))
                          }
                        />
                      }
                      label={DAY_STEP_LABEL[step]}
                    />
                  ))}
                  <Button
                    size="small"
                    disabled={fixing || chainRunning}
                    onClick={() => setDaySteps(ALL_DAY_STEPS)}
                  >
                    全選
                  </Button>
                </Stack>
              </Box>
              <Box>
                <Button
                  variant="contained"
                  disabled={!canFixDay || fixing || chainRunning}
                  onClick={() => void onFixDay()}
                >
                  {fixing && !chainRunning ? "修復中…" : "Fix this day"}
                </Button>
              </Box>
              <Box sx={{ pt: 1 }}>
                <Typography variant="subtitle2" sx={{ mb: 1 }}>
                  區間修（2.1–2.6 一次）
                </Typography>
                <Typography variant="body2" color="text.secondary" sx={{ mb: 1 }}>
                  使用上面勾的步驟，一次 API 但改為逐日（與單日修相同 SQL，每天 commit）。可含今天（freeze dump 夜）。前端最長約 20 分鐘；大區間仍建議匯出 SQL。
                </Typography>
                <Stack direction="row" spacing={1} alignItems="center" flexWrap="wrap" useFlexGap>
                  <TextField
                    size="small"
                    type="date"
                    label="from"
                    value={chainFrom}
                    onChange={(e) => setChainFrom(e.target.value)}
                    disabled={chainRunning}
                    InputLabelProps={{ shrink: true }}
                  />
                  <TextField
                    size="small"
                    type="date"
                    label="to"
                    value={chainTo}
                    onChange={(e) => setChainTo(e.target.value)}
                    disabled={chainRunning}
                    InputLabelProps={{ shrink: true }}
                  />
                  <Button
                    variant="contained"
                    disabled={fixing || chainRunning}
                    onClick={() => void onFixDayRange()}
                  >
                    {chainRunning ? "區間修中…" : "區間修"}
                  </Button>
                </Stack>
              </Box>
              <Box sx={{ pt: 1 }}>
                <Typography variant="subtitle2" sx={{ mb: 1 }}>
                  匯出已修 SQL（新庫用）
                </Typography>
                <Typography variant="body2" color="text.secondary" sx={{ mb: 1 }}>
                  勾選要匯出的段落（同日修步驟）。套檔順序：1.0 → 2.1 → ledger（±2.3）→ 2.7 入出倉單＋調整記錄＋ADJ →
                  2.6。完整檔且正式庫 freeze／id 同源、日期蓋過全部已修日子時，結果與已修庫相同。預設只匯
                  ledger＋日結（舊行為）。
                </Typography>
                <Stack direction="row" spacing={0} flexWrap="wrap" useFlexGap sx={{ mb: 1 }}>
                  {EXPORT_PARTS.map((part) => (
                    <FormControlLabel
                      key={part}
                      control={
                        <Checkbox
                          size="small"
                          checked={exportParts[part]}
                          disabled={exporting}
                          onChange={(_, checked) =>
                            setExportParts((prev) => ({ ...prev, [part]: checked }))
                          }
                        />
                      }
                      label={EXPORT_PART_LABEL[part]}
                    />
                  ))}
                  <Button
                    size="small"
                    disabled={exporting}
                    onClick={() => setExportParts(DEFAULT_EXPORT_PARTS)}
                  >
                    預設
                  </Button>
                  <Button
                    size="small"
                    disabled={exporting}
                    onClick={() => setExportParts(FULL_EXPORT_PARTS)}
                  >
                    完整檔
                  </Button>
                </Stack>
                {exportError && <Alert severity="error">{exportError}</Alert>}
                <Stack direction="row" spacing={1} alignItems="center" flexWrap="wrap" useFlexGap>
                  <TextField
                    size="small"
                    type="date"
                    label="from"
                    value={exportFrom}
                    onChange={(e) => setExportFrom(e.target.value)}
                    InputLabelProps={{ shrink: true }}
                  />
                  <TextField
                    size="small"
                    type="date"
                    label="to"
                    value={exportTo}
                    onChange={(e) => setExportTo(e.target.value)}
                    InputLabelProps={{ shrink: true }}
                  />
                  <Button
                    variant="outlined"
                    disabled={exporting}
                    onClick={() => void onExportSql()}
                  >
                    {exporting ? "匯出中…" : "匯出 .sql"}
                  </Button>
                </Stack>
              </Box>
            </Stack>
          </Paper>
        </Stack>
      )}

      {tab === "inventory" && (
        <Paper sx={{ p: 2 }}>
          <Stack spacing={2}>
            <Typography variant="body2" color="text.secondary">
              搜 itemCode 或 inventoryId。Fix 會重算這顆料到今天為止全部流水的 lotQty、日結與
              balance，不必逐日點日曆。白天倉還在寫這顆料時，修完後新流水仍由 live writer 接。
            </Typography>
            <Stack direction="row" spacing={1}>
              <TextField
                size="small"
                label="itemCode / inventoryId"
                value={invQuery}
                onChange={(e) => setInvQuery(e.target.value)}
                onKeyDown={(e) => {
                  if (e.key === "Enter") void onSearchInventory();
                }}
              />
              <Button
                variant="outlined"
                disabled={searching || !invQuery.trim()}
                onClick={() => void onSearchInventory()}
              >
                {searching ? "搜尋中…" : "搜尋"}
              </Button>
            </Stack>
            {searchError && <Alert severity="error">{searchError}</Alert>}
            {invHits.length > 0 && (
              <Table size="small">
                <TableHead>
                  <TableRow>
                    <TableCell>inventoryId</TableCell>
                    <TableCell>itemCode</TableCell>
                    <TableCell>uomId</TableCell>
                    <TableCell align="right">ledger 列</TableCell>
                  </TableRow>
                </TableHead>
                <TableBody>
                  {invHits.map((h) => (
                    <TableRow
                      key={h.inventoryId}
                      hover
                      selected={scope?.kind === "inventory" && scope.id === h.inventoryId}
                      onClick={() => void loadInventoryScope(h.inventoryId)}
                      sx={{ cursor: "pointer" }}
                    >
                      <TableCell>{h.inventoryId}</TableCell>
                      <TableCell>{h.itemCode ?? "—"}</TableCell>
                      <TableCell>{h.uomId ?? "—"}</TableCell>
                      <TableCell align="right">{h.ledgerCnt}</TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            )}
            {fixError && <Alert severity="error">{fixError}</Alert>}
            {fixMessage && <Alert severity="success">{fixMessage}</Alert>}
            {scopeLoading && <CircularProgress size={24} />}
            {scope?.kind === "inventory" && !scopeLoading && (
              <>
                <Typography variant="body2">
                  {scope.itemCode ?? "?"} / inventory {scope.id} / uom {scope.uomId ?? "?"}
                  ；{scope.firstDate} → {scope.lastDate}；{scope.cnt} 列；最後
                  balance {scope.lastBalance ?? "—"}
                </Typography>
                <CheckPartsTable parts={scope.parts} />
                <Box>
                  <Button
                    variant="contained"
                    disabled={fixing || scope.cnt === 0}
                    onClick={() => void onFixInventoryScope()}
                  >
                    {fixing ? "修復中…" : "Fix this inventory"}
                  </Button>
                </Box>
              </>
            )}
          </Stack>
        </Paper>
      )}

      {tab === "lot" && (
        <Paper sx={{ p: 2 }}>
          <Stack spacing={2}>
            <Typography variant="body2" color="text.secondary">
              搜 lotNo 或 inventoryLotLineId。Fix 只重算這張 lot 的 lotQty 與日結，不改
              balance。
            </Typography>
            <Stack direction="row" spacing={1}>
              <TextField
                size="small"
                label="lotNo / lot line id"
                value={lotQuery}
                onChange={(e) => setLotQuery(e.target.value)}
                onKeyDown={(e) => {
                  if (e.key === "Enter") void onSearchLot();
                }}
              />
              <Button
                variant="outlined"
                disabled={searching || !lotQuery.trim()}
                onClick={() => void onSearchLot()}
              >
                {searching ? "搜尋中…" : "搜尋"}
              </Button>
            </Stack>
            {searchError && <Alert severity="error">{searchError}</Alert>}
            {lotHits.length > 0 && (
              <Table size="small">
                <TableHead>
                  <TableRow>
                    <TableCell>lot line id</TableCell>
                    <TableCell>lotNo</TableCell>
                    <TableCell>itemCode</TableCell>
                    <TableCell>inventoryId</TableCell>
                    <TableCell align="right">ledger 列</TableCell>
                  </TableRow>
                </TableHead>
                <TableBody>
                  {lotHits.map((h) => (
                    <TableRow
                      key={h.inventoryLotLineId}
                      hover
                      selected={scope?.kind === "lot" && scope.id === h.inventoryLotLineId}
                      onClick={() => void loadLotScope(h.inventoryLotLineId)}
                      sx={{ cursor: "pointer" }}
                    >
                      <TableCell>{h.inventoryLotLineId}</TableCell>
                      <TableCell>{h.lotNo ?? "—"}</TableCell>
                      <TableCell>{h.itemCode ?? "—"}</TableCell>
                      <TableCell>{h.inventoryId ?? "—"}</TableCell>
                      <TableCell align="right">{h.ledgerCnt}</TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            )}
            {fixError && <Alert severity="error">{fixError}</Alert>}
            {fixMessage && <Alert severity="success">{fixMessage}</Alert>}
            {scopeLoading && <CircularProgress size={24} />}
            {scope?.kind === "lot" && !scopeLoading && (
              <>
                <Typography variant="body2">
                  {scope.lotNo ?? "?"} / lot {scope.id} / {scope.itemCode ?? "?"}
                  ；{scope.firstDate} → {scope.lastDate}；{scope.cnt} 列；最後
                  lotQtyAfter {scope.lastLotQtyAfter ?? "—"}
                </Typography>
                <CheckPartsTable parts={scope.parts} />
                <Box>
                  <Button
                    variant="contained"
                    disabled={fixing || scope.cnt === 0}
                    onClick={() => void onFixLotScope()}
                  >
                    {fixing ? "修復中…" : "Fix this lot"}
                  </Button>
                </Box>
              </>
            )}
          </Stack>
        </Paper>
      )}
    </Stack>
  );
};

export default StockLedgerFixPageClient;