/**
 * 报价模板预览：Excel 样式网格（上传原文），辅以映射摘要。
 * 主数据来自 /previewSheet；mappingJson 用于已映射/未映射清单。
 */

/** 系统字段 code → 中文标签 */
export const FIELD_LABELS: Record<string, string> = {
  customer_name: "客户名称",
  contact_name: "联系人",
  contact_phone: "电话",
  quote_no: "报价单编号",
  quote_date: "报价日期",
  valid_until: "有效期至",
  currency: "币别",
  sales_name: "业务员",
  pol: "起运港",
  pod: "目的港",
  origin: "始发地",
  destination: "目的地",
  commodity: "品名",
  quantity: "货物数量",
  container_type_qty: "箱型箱量",
  fcl_or_lcl: "整柜或拼柜",
  trade_terms: "贸易条款",
  cargo_ready_date: "货好时间",
  pieces: "件数",
  weight_kg: "重量",
  volume_cbm: "体积",
  total_amount: "报价合计",
  chargeable_weight_kg: "计费重",
  delivery_address: "送货地址",
  pickup_address: "提货地址",
  transit_time: "运输时效",
  cargo_value: "货值",
  hs_code: "HS编码",
  oil_elec_mag: "油电磁",
  has_battery: "是否带电",
  on_board_date: "开船日",
  special_remarks: "特殊备注",
  eta_request: "要求到港",
  sailing_schedule: "船期",
  shipping_line: "船公司",
  flight_no: "航班号",
  transfer_airport: "中转机场",
  effective_date: "生效日期",
  fuel_surcharge_rate: "燃油附加费率",
  tax_rate: "税率",
  has_oil: "是否含油",
  has_magnet: "是否含磁",
  vehicle_qty: "车型/数量",
};

/** 解析结果摘要：供预览弹窗展示「已解析 / 未解析」 */
export type MappingFieldItem = {
  code: string;
  label: string;
  cell: string;
};

export type MappingRegionItem = {
  kind: "fee" | "route";
  id: string;
  title: string;
};

export type MappingParseSummary = {
  fields: MappingFieldItem[];
  regions: MappingRegionItem[];
  gaps: string[];
  unmappedRequired: string[];
  unmappedLabels: string[];
  pointCount: number;
};

function asMappingObject(mappingJson: unknown): Record<string, any> | null {
  if (!mappingJson) return null;
  if (typeof mappingJson === "object") return mappingJson as Record<string, any>;
  if (typeof mappingJson === "string") {
    try {
      const obj = JSON.parse(mappingJson);
      return obj && typeof obj === "object" ? obj : null;
    } catch {
      return null;
    }
  }
  return null;
}

/**
 * 从 mappingJson 拆出运营可读的已映射 / 未映射清单。
 * 不打接口；mappingGaps 为空时（旧版解析）仍可看 fields 与 unmapped*。
 */
export function summarizeMappingParse(mappingJson: unknown): MappingParseSummary {
  const obj = asMappingObject(mappingJson);
  const empty: MappingParseSummary = {
    fields: [],
    regions: [],
    gaps: [],
    unmappedRequired: [],
    unmappedLabels: [],
    pointCount: 0,
  };
  if (!obj) return empty;

  const fieldsObj = obj.fields && typeof obj.fields === "object" ? obj.fields : {};
  const fields: MappingFieldItem[] = Object.keys(fieldsObj)
    .filter((k) => fieldsObj[k])
    .map((code) => ({
      code,
      label: FIELD_LABELS[code] || code,
      cell: String(fieldsObj[code] || ""),
    }))
    .sort((a, b) => a.label.localeCompare(b.label, "zh"));

  const regions: MappingRegionItem[] = [];
  const feeRegions = Array.isArray(obj.feeRegions) ? obj.feeRegions : [];
  for (const r of feeRegions) {
    if (!r || typeof r !== "object") continue;
    regions.push({
      kind: "fee",
      id: String(r.id || ""),
      title: String(r.title || r.id || "费用区"),
    });
  }
  const routeRegions = Array.isArray(obj.routeRegions) ? obj.routeRegions : [];
  for (const r of routeRegions) {
    if (!r || typeof r !== "object") continue;
    regions.push({
      kind: "route",
      id: String(r.id || ""),
      title: String(r.title || r.id || "线路区"),
    });
  }

  const gaps = Array.isArray(obj.mappingGaps)
    ? obj.mappingGaps.map((x: any) => String(x)).filter(Boolean)
    : [];
  const unmappedRequired = Array.isArray(obj.unmappedRequired)
    ? obj.unmappedRequired.map((x: any) => String(x)).filter(Boolean)
    : [];
  const unmappedLabels = Array.isArray(obj.unmappedLabels)
    ? obj.unmappedLabels.map((x: any) => String(x)).filter(Boolean)
    : [];

  return {
    fields,
    regions,
    gaps,
    unmappedRequired,
    unmappedLabels,
    pointCount: fields.length + regions.length,
  };
}

export type SheetPreviewCell = {
  addr: string;
  text: string;
  yellow: boolean;
  mappedCode?: string;
  mappedLabel?: string;
};

export type SheetPreviewRow = {
  rowNo: number;
  cells: SheetPreviewCell[];
};

export type PreviewViewModel = {
  loading: boolean;
  error: string;
  sheet: string;
  fileName: string;
  colHeaders: string[];
  rows: SheetPreviewRow[];
  mappedCount: number;
  yellowCount: number;
  unmappedLabels: string[];
  unmappedRequired: string[];
};

function parseUnmapped(mappingJson: unknown): string[] {
  if (!mappingJson) return [];
  let obj: any = mappingJson;
  if (typeof mappingJson === "string") {
    try {
      obj = JSON.parse(mappingJson);
    } catch {
      return [];
    }
  }
  return Array.isArray(obj?.unmappedRequired) ? obj.unmappedRequired.map((x: any) => String(x)) : [];
}

/** 把主账 previewSheet 结果转成弹窗视图 */
export function buildSheetPreviewViewModel(sheetRes: any, mappingJson?: unknown): PreviewViewModel {
  const colHeaders = Array.isArray(sheetRes?.colHeaders)
    ? sheetRes.colHeaders.map((x: any) => String(x))
    : [];
  const rowsRaw = Array.isArray(sheetRes?.rows) ? sheetRes.rows : [];
  const rows: SheetPreviewRow[] = rowsRaw.map((r: any) => ({
    rowNo: Number(r.rowNo || 0),
    cells: Array.isArray(r.cells)
      ? r.cells.map((c: any) => ({
          addr: String(c.addr || ""),
          text: String(c.text || ""),
          yellow: Boolean(c.yellow),
          mappedCode: c.mappedCode ? String(c.mappedCode) : undefined,
          mappedLabel: c.mappedLabel ? String(c.mappedLabel) : undefined,
        }))
      : [],
  }));
  let yellowCount = 0;
  let mappedHit = 0;
  for (const row of rows) {
    for (const c of row.cells) {
      if (c.yellow) yellowCount += 1;
      if (c.mappedCode) mappedHit += 1;
    }
  }
  const unmapped = parseUnmapped(mappingJson);
  return {
    loading: false,
    error: String(sheetRes?.error || ""),
    sheet: String(sheetRes?.sheet || ""),
    fileName: String(sheetRes?.fileName || ""),
    colHeaders,
    rows,
    mappedCount: Number(sheetRes?.mappedCount || mappedHit || 0),
    yellowCount,
    unmappedLabels: unmapped.map((c) => FIELD_LABELS[c] || c),
    unmappedRequired: unmapped,
  };
}

export function emptyPreviewViewModel(): PreviewViewModel {
  return {
    loading: false,
    error: "",
    sheet: "",
    fileName: "",
    colHeaders: [],
    rows: [],
    mappedCount: 0,
    yellowCount: 0,
    unmappedLabels: [],
    unmappedRequired: [],
  };
}

/** @deprecated 兼容旧名：请用 buildSheetPreviewViewModel */
export function buildPreviewViewModel(_mappingJson: unknown, _pointCountHint = 0): PreviewViewModel {
  return emptyPreviewViewModel();
}