import { isValidContainerNo } from "@/utils/iso6346";

/**
 * 这一条「预报」指令是否具备进入确认页的数据与状态。
 * 不看整封邮件主类型：同封还可以有转仓/工单/DO，互不拦截。
 * 仅柜头预报（有柜号、暂无货件行）也可进入确认页补录/空货件导入。
 */
export function canEnterForecastConfirm(input: {
  status: string;
  validShipmentCount: number;
  /** 已解析出可用柜号（ISO 柜头），允许无货件行进入确认 */
  hasContainerHeader?: boolean;
  /** 详情页仅待确认类状态可点导入；确认页还允许多种导入后回看状态 */
  allowReadonlyStatuses?: boolean;
}): boolean {
  const { status, validShipmentCount } = input;
  const hasRows = validShipmentCount >= 1;
  const headerOnly = Boolean(input.hasContainerHeader) && !hasRows;
  if (!hasRows && !headerOnly) return false;

  if (input.allowReadonlyStatuses) {
    return [
      "PENDING_CONFIRM",
      "FAILED",
      "IMPORTING",
      "SUCCESS",
      "PARTIAL_SUCCESS",
    ].includes(status);
  }

  return (
    status === "PENDING_CONFIRM" ||
    status === "FAILED" ||
    status === "PARTIAL_SUCCESS"
  );
}

export type ForecastImportIssues = {
  /** 字段级错误，挂到对应表单项 */
  errors: Record<string, string>;
  /** 阻断「确认导入」的原因（按钮灰掉时必须展示） */
  blockers: string[];
  /** 不阻断提交的提示（如仅柜头、货件全无效） */
  notes: string[];
};

function summarizeInvalidRows(
  rows: Array<{ row_index: number; invalid_reasons?: string[] }>,
): string | null {
  if (!rows.length) return null;
  const counts = new Map<string, number>();
  for (const row of rows) {
    const reasons = row.invalid_reasons?.length
      ? row.invalid_reasons
      : ["未标明原因"];
    for (const reason of reasons) {
      counts.set(reason, (counts.get(reason) || 0) + 1);
    }
  }
  const parts = [...counts.entries()].map(([reason, n]) =>
    n > 1 ? `${reason}（${n}行）` : reason,
  );
  return `货件有 ${rows.length} 行未通过校验：${parts.join("、")}。请在本页补全必填项或导入装箱表。`;
}

/**
 * 实时收集确认导入页的缺项 / 错项，供灰按钮旁提示与字段红字共用。
 * 必填以 SaveContainer 为准：柜头 F_TransMode / F_OperationType / F_ContainerNo / F_CabinetType；
 * 货件行 F_FBACode / F_Transporter / F_CTNS（由 VALID 行保证）。无有效货件不可导入。
 */
export function collectForecastImportIssues(input: {
  transMode: number | null | undefined;
  operationType: number | null | undefined;
  containerNo: string;
  /** 柜型（SaveContainer 必填） */
  cabinetType?: string | null;
  hasContainerConflict: boolean;
  containerSource: "body" | "attachment" | null;
  validRowCount: number;
  selectedValidCount: number;
  invalidRows?: Array<{ row_index: number; invalid_reasons?: string[] }>;
  shipmentCount?: number;
  hasUnmappedSelected: boolean;
  ackUnmapped: boolean;
  softLimitExceeded?: boolean;
  portal?: "admin" | "client";
  step?: number;
}): ForecastImportIssues {
  const errors: Record<string, string> = {};
  const blockers: string[] = [];
  const notes: string[] = [];
  const invalidRows = input.invalidRows ?? [];
  const shipmentCount = input.shipmentCount ?? 0;

  if (input.transMode !== 0 && input.transMode !== 1 && input.transMode !== 3) {
    const msg = "请选择运输方式（海运 / 空运 / 自送柜）";
    errors.transMode = msg;
    blockers.push(msg);
  }
  if (
    input.operationType !== 0 &&
    input.operationType !== 2 &&
    input.operationType !== 4
  ) {
    const msg = "请选择业务类型（提拆派 / 直送 / 只清关）";
    errors.operationType = msg;
    blockers.push(msg);
  }

  const containerNo = (input.containerNo || "").trim();
  if (!containerNo) {
    const msg = "柜号为空，请填写 4 位字母 + 7 位数字（ISO 6346）";
    errors.containerNo = msg;
    blockers.push(msg);
  } else if (!isValidContainerNo(containerNo)) {
    const msg = `柜号「${containerNo.toUpperCase()}」不符合 ISO 6346 校验位，请核对后改正`;
    errors.containerNo = msg;
    blockers.push(msg);
  }

  if (!(input.cabinetType || "").trim()) {
    const msg = "请选择柜型（标准：20GP / 40GP / 40HQ / 40HR / 45HQ / 53HQ 等）";
    errors.cabinetType = msg;
    blockers.push(msg);
  }

  if (input.hasContainerConflict && !input.containerSource) {
    const msg = "正文与附件柜号不一致，请先选定使用哪一个";
    errors.containerSource = msg;
    blockers.push(msg);
  }

  if (input.validRowCount <= 0) {
    const msg =
      shipmentCount > 0 || invalidRows.length > 0
        ? "没有可导入的有效货件行（必填：派送方式、件数、体积、毛重）。请在本页修改或导入装箱表"
        : "未解析到货件信息。请在本页新增货件，或导入卡派清单（xlsx）后再确认导入";
    errors.rows = msg;
    blockers.push(msg);
  } else if (input.selectedValidCount === 0) {
    const msg = input.softLimitExceeded
      ? "货件超过软限，默认未全选；请筛选后至少勾选一行有效货件"
      : "请至少勾选一行有效货件";
    errors.rows = msg;
    blockers.push(msg);
  }

  if (input.hasUnmappedSelected && !input.ackUnmapped) {
    const msg = "所选货件含未映射渠道，请勾选「已知晓存在未映射渠道，仍提交原值」";
    errors.ack = msg;
    blockers.push(msg);
  }

  const invalidSummary = summarizeInvalidRows(invalidRows);
  if (input.validRowCount === 0 && invalidSummary) {
    notes.push(invalidSummary);
  }

  return { errors, blockers, notes };
}