import type { FastifyInstance, FastifyReply, FastifyRequest } from 'fastify';
import { z } from 'zod';
import type { AuthRepository } from '../auth/auth-repository.js';
import { authenticateAccessToken } from '../auth/authenticate.js';
import type { AccessProfile } from '../auth/rbac-repository.js';
import {
  OrderManagementError, type OrderManagementRepository
} from '../orders/order-management-repository.js';
import type { OrderActor } from '../orders/order-state-repository.js';

const paramsSchema = z.object({ orderId: z.string().regex(/^[1-9]\d{0,19}$/) });
const renewSchema = z.object({
  endAt: z.coerce.date(),
  pricingPolicy: z.enum(['CURRENT', 'LOCKED']).default('CURRENT'),
  reason: z.string().min(1).max(512)
}).strict();
const roomSchema = z.object({
  roomId: z.string().regex(/^[1-9]\d{0,19}$/),
  reason: z.string().min(1).max(512)
}).strict();
const timeSchema = z.object({
  startAt: z.coerce.date().optional(),
  endAt: z.coerce.date().optional(),
  reason: z.string().min(1).max(512)
}).strict().refine((value) => value.startAt || value.endAt);
const noteSchema = z.object({ note: z.string().min(1).max(512) }).strict();

export interface OrderManagementRouteOptions {
  repository: Pick<OrderManagementRepository,
    'renew' | 'changeRoom' | 'adjustTime' | 'note' | 'cancellationQuote'
    | 'customerRenew' | 'customerChangeRoom'>;
  authRepository: Pick<AuthRepository, 'validateSession'>;
  accessControl: { getAccessProfile(tenantId: string, userId: string): Promise<AccessProfile> };
  jwtSecret: string;
}

export async function registerOrderManagementRoutes(
  app: FastifyInstance, options: OrderManagementRouteOptions
) {
  app.post('/app-api/orders/:orderId/renew', async (request, reply) => {
    const auth = await authenticate(request.headers.authorization, options);
    const params = paramsSchema.safeParse(request.params);
    const body = renewSchema.safeParse(request.body);
    if (!auth) return unauthorized(reply, request.traceId);
    if (!params.success || !body.success) return invalid(reply, request.traceId);
    const actor = customerActor(auth, request);
    return handle(reply, request.traceId, async () => ({
      code: 0,
      data: await options.repository.customerRenew(actor, params.data.orderId, body.data),
      traceId: request.traceId
    }));
  });

  app.post('/app-api/orders/:orderId/change-room', async (request, reply) => {
    const auth = await authenticate(request.headers.authorization, options);
    const params = paramsSchema.safeParse(request.params);
    const body = roomSchema.safeParse(request.body);
    if (!auth) return unauthorized(reply, request.traceId);
    if (!params.success || !body.success) return invalid(reply, request.traceId);
    const actor = customerActor(auth, request);
    return handle(reply, request.traceId, async () => ({
      code: 0,
      data: await options.repository.customerChangeRoom(actor, params.data.orderId, body.data),
      traceId: request.traceId
    }));
  });

  app.get('/app-api/orders/:orderId/cancellation-quote', async (request, reply) => {
    const auth = await authenticate(request.headers.authorization, options);
    const params = paramsSchema.safeParse(request.params);
    if (!auth) return unauthorized(reply, request.traceId);
    if (!params.success) return invalid(reply, request.traceId);
    return handle(reply, request.traceId, async () => ({
      code: 0,
      data: await options.repository.cancellationQuote(
        auth.tenantId, auth.userId, params.data.orderId
      ),
      traceId: request.traceId
    }));
  });

  const adminActions = [
    ['renew', renewSchema, (actor: OrderActor, orderId: string, body: z.infer<typeof renewSchema>) =>
      options.repository.renew(actor, orderId, body)],
    ['change-room', roomSchema, (actor: OrderActor, orderId: string, body: z.infer<typeof roomSchema>) =>
      options.repository.changeRoom(actor, orderId, body)],
    ['adjust-time', timeSchema, (actor: OrderActor, orderId: string, body: z.infer<typeof timeSchema>) =>
      options.repository.adjustTime(actor, orderId, body)],
    ['note', noteSchema, (actor: OrderActor, orderId: string, body: z.infer<typeof noteSchema>) =>
      options.repository.note(actor, orderId, body.note)]
  ] as const;

  for (const [path, schema, execute] of adminActions) {
    app.post(`/admin-api/orders/:orderId/${path}`, async (request, reply) => {
      const auth = await authenticate(request.headers.authorization, options);
      const params = paramsSchema.safeParse(request.params);
      const body = schema.safeParse(request.body);
      if (!auth) return unauthorized(reply, request.traceId);
      if (!params.success || !body.success) return invalid(reply, request.traceId);
      const actor = {
        tenantId: auth.tenantId, userId: auth.userId, actorType: 'USER' as const,
        source: 'ADMIN' as const, traceId: request.traceId, ip: request.ip,
        userAgent: request.headers['user-agent'] ?? '', access: auth.access
      };
      return handle(reply, request.traceId, async () => ({
        code: 0,
        data: await execute(actor, params.data.orderId, body.data as never),
        traceId: request.traceId
      }));
    });
  }
}

function customerActor(
  auth: { tenantId: string; userId: string; access: AccessProfile },
  request: FastifyRequest
): OrderActor {
  return {
    tenantId: auth.tenantId, userId: auth.userId, actorType: 'USER',
    source: 'APP', traceId: request.traceId, ip: request.ip,
    userAgent: String(request.headers['user-agent'] ?? ''), access: auth.access
  };
}

async function authenticate(
  authorization: string | undefined, options: OrderManagementRouteOptions
) {
  const result = await authenticateAccessToken(
    authorization, options.authRepository, options.jwtSecret
  );
  if (!result) return null;
  const tenantId = result.session.tenantId;
  const userId = result.session.user.id;
  return {
    tenantId, userId,
    access: await options.accessControl.getAccessProfile(tenantId, userId)
  };
}

async function handle(reply: FastifyReply, traceId: string, work: () => Promise<unknown>) {
  try {
    return await work();
  } catch (error) {
    if (!(error instanceof OrderManagementError)) throw error;
    const status = error.code === 'ORDER_NOT_FOUND' || error.code === 'ROOM_NOT_FOUND' ? 404
      : error.code === 'TIME_SLOT_CONFLICT' ? 409
        : error.code.includes('FORBIDDEN') ? 403 : 400;
    return reply.status(status).send({
      code: error.code,
      message: 'The requested order adjustment is not available.',
      traceId
    });
  }
}

function unauthorized(reply: FastifyReply, traceId: string) {
  return reply.status(401).send({
    code: 'AUTH_SESSION_INVALID', message: 'Authentication required.', traceId
  });
}

function invalid(reply: FastifyReply, traceId: string) {
  return reply.status(400).send({
    code: 'INVALID_ORDER_ADJUSTMENT', message: 'The order adjustment is invalid.', traceId
  });
}