const { z } = require("zod");

const { AppError } = require("../utils/AppError");
const { sendData } = require("../utils/reply");
const { buildAuditLogData } = require("../utils/audit");
const { normalizeTravelImportRows } = require("../services/integrations/travel");

const IMPORT_SCHEMA = z.object({
  orders: z.array(z.record(z.string(), z.unknown())).min(1).max(100),
});

function mapTravelOrder(item) {
  return {
    id: item.id,
    source: item.source,
    externalOrderNo: item.external_order_no,
    employeeId: item.employee_id,
    departmentId: item.department_id ?? null,
    linkedReimbursementId: item.linked_reimbursement_id ?? null,
    occurredAt: item.occurred_at?.toISOString?.()?.slice(0, 10) ?? null,
    amount: item.amount?.toString?.() ?? null,
    currency: item.currency,
    status: item.status,
    createdAt: item.created_at?.toISOString?.() ?? null,
    updatedAt: item.updated_at?.toISOString?.() ?? null,
  };
}

async function travelOrdersRoutes(fastify) {
  fastify.post(
    "/travel/orders/import",
    {
      preHandler: fastify.requirePermission("integration.manage"),
    },
    async (request, reply) => {
      if (!fastify.config.travelSyncEnabled) {
        throw new AppError({
          code: "VALID_001",
          message: "参数校验失败",
          statusCode: 409,
          details: { integration: "travel_sync_disabled" },
        });
      }

      const parsed = IMPORT_SCHEMA.safeParse(request.body ?? {});
      if (!parsed.success) {
        throw new AppError({
          code: "VALID_001",
          message: "参数校验失败",
          statusCode: 400,
          details: parsed.error.flatten(),
        });
      }

      const rows = normalizeTravelImportRows(parsed.data.orders);
      if (!rows.length) {
        throw new AppError({
          code: "VALID_001",
          message: "参数校验失败",
          statusCode: 400,
          details: { orders: "empty_after_normalization" },
        });
      }

      const employeeIds = Array.from(new Set(rows.map((item) => item.employeeId)));
      const employees = await fastify.prisma.employee.findMany({
        where: {
          id: { in: employeeIds },
          status: "active",
        },
        select: {
          id: true,
          department_id: true,
        },
      });
      const employeeMap = new Map(employees.map((item) => [item.id, item]));

      const created = [];
      const skipped = [];

      for (const row of rows) {
        const employee = employeeMap.get(row.employeeId);
        if (!employee) {
          skipped.push({
            source: row.source,
            externalOrderNo: row.externalOrderNo,
            reason: "employee_not_found",
          });
          continue;
        }

        const upserted = await fastify.prisma.travelOrder.upsert({
          where: {
            source_external_order_no: {
              source: row.source,
              external_order_no: row.externalOrderNo,
            },
          },
          update: {
            employee_id: row.employeeId,
            department_id: employee.department_id,
            linked_reimbursement_id: row.linkedReimbursementId,
            occurred_at: row.occurredAt,
            amount: row.amount,
            currency: row.currency,
            status: "imported",
            raw_payload: row.rawPayload,
            updated_by: request.employee.id,
          },
          create: {
            source: row.source,
            external_order_no: row.externalOrderNo,
            employee_id: row.employeeId,
            department_id: employee.department_id,
            linked_reimbursement_id: row.linkedReimbursementId,
            occurred_at: row.occurredAt,
            amount: row.amount,
            currency: row.currency,
            status: "imported",
            raw_payload: row.rawPayload,
            created_by: request.employee.id,
            updated_by: request.employee.id,
          },
        });

        created.push(upserted);
      }

      await fastify.prisma.auditLog.create({
        data: buildAuditLogData(request, {
          actorId: request.employee.id,
          action: "TRAVEL_ORDERS_IMPORTED",
          targetType: "travel_order",
          extra: {
            requested: rows.length,
            createdOrUpdated: created.length,
            skipped,
          },
        }),
      });

      return sendData(reply, request, {
        requested: rows.length,
        imported: created.length,
        skipped,
        items: created.map(mapTravelOrder),
      });
    },
  );
}

module.exports = travelOrdersRoutes;