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

const { AppError } = require("../utils/AppError");
const { sendData } = require("../utils/reply");
const {
  normalizeDocumentType,
  resolveDocumentSequenceConfig,
} = require("../services/documentSequence");

const ENABLED_QUERY_SCHEMA = z.object({
  enabled: z.enum(["true", "false", "1", "0"]).optional(),
});

const DOCUMENT_TYPE_PARAM_SCHEMA = z.object({
  documentType: z.string().trim().min(1).max(64).regex(/^[a-z_]+$/),
});

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

  const enabledRaw = parsed.data.enabled;
  const enabled =
    enabledRaw == null
      ? null
      : ["true", "1"].includes(enabledRaw)
        ? true
        : ["false", "0"].includes(enabledRaw)
          ? false
          : null;

  return { enabled };
}

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

  return normalizeDocumentType(parsed.data.documentType);
}

function mapApprovalRule(item) {
  return {
    id: item.id,
    name: item.name,
    minAmount: item.min_amount?.toString?.() ?? String(item.min_amount ?? "0"),
    maxAmount: item.max_amount == null ? null : item.max_amount?.toString?.() ?? String(item.max_amount),
    level1Role: item.level1_role,
    level2Role: item.level2_role ?? null,
    level3Role: item.level3_role ?? null,
    enabled: item.enabled,
    priority: item.priority,
    createdAt: item.created_at?.toISOString?.() ?? null,
    updatedAt: item.updated_at?.toISOString?.() ?? null,
  };
}

function mapDocumentSequence(config) {
  return {
    exists: Boolean(config.exists),
    source: config.source,
    documentType: config.documentType,
    documentCategoryCode: config.documentCategoryCode ?? null,
    prefix: config.prefix,
    dateFormat: config.dateFormat,
    separator: config.separator,
    numberLength: config.numberLength,
    resetPeriod: config.resetPeriod,
    currentNumber: config.currentNumber,
    lastResetDate: config.lastResetDate ?? null,
    updatedAt: config.updatedAt ?? null,
    updatedBy: config.updatedBy ?? null,
  };
}

async function loadDocumentSequenceConfig(fastify, documentType) {
  return resolveDocumentSequenceConfig(fastify.prisma, {
    documentType,
  });
}

async function configReadRoutes(fastify) {
  fastify.get(
    "/approval-rules",
    {
      preHandler: fastify.authenticate,
    },
    async (request, reply) => {
      const query = parseEnabledQuery(request.query);

      const items = await fastify.prisma.approvalRule.findMany({
        where: {
          ...(query.enabled == null ? {} : { enabled: query.enabled }),
        },
        orderBy: [{ priority: "asc" }, { min_amount: "asc" }],
        select: {
          id: true,
          name: true,
          min_amount: true,
          max_amount: true,
          level1_role: true,
          level2_role: true,
          level3_role: true,
          enabled: true,
          priority: true,
          created_at: true,
          updated_at: true,
        },
      });

      return sendData(reply, request, {
        enabled: query.enabled,
        items: items.map(mapApprovalRule),
      });
    },
  );

  fastify.get(
    "/document-sequences/reimbursement",
    {
      preHandler: fastify.requirePermission("system.settings"),
    },
    async (request, reply) => {
      const config = await loadDocumentSequenceConfig(fastify, "reimbursement");
      return sendData(reply, request, mapDocumentSequence(config));
    },
  );

  fastify.get(
    "/document-sequences/:documentType",
    {
      preHandler: fastify.requirePermission("system.settings"),
    },
    async (request, reply) => {
      const documentType = parseDocumentTypeParams(request.params);
      const config = await loadDocumentSequenceConfig(fastify, documentType);
      return sendData(reply, request, mapDocumentSequence(config));
    },
  );
}

module.exports = configReadRoutes;