import assert from 'node:assert/strict';
import { EventEmitter } from 'node:events';
import express from 'express';
import test from 'node:test';
import type { RequestHandler } from 'express';
import { createRequest, createResponse } from 'node-mocks-http';
import type { Body, Headers, RequestMethod, RequestOptions } from 'node-mocks-http';

import { createEntityRouter } from '../../src/factories/router.factory.ts';
import { commonErrorHandler } from '../../src/helpers.ts';
import type {
  EntityRouterDbApi,
  EntityRouterService,
} from '../../src/types/index.ts';
import {
  setCurrentUser,
  setRuntimeContext,
} from '../../src/utils/request-context.ts';

const USER_ID = '0f5cb907-73d3-45da-9e42-bf3e4b499efb';
const ENTITY_ID = 'aa0b89ab-b0db-4d6c-a59c-c7785fc3eae5';

interface RecordedCall {
  name: string;
  payload: unknown;
}

function contextMiddleware(): RequestHandler {
  return (req, _res, next) => {
    setCurrentUser(req, {
      id: USER_ID,
      app_role: {
        name: 'Test Role',
        permissions: [
          { name: 'READ_TEST_ENTITIES' },
          { name: 'CREATE_TEST_ENTITIES' },
          { name: 'UPDATE_TEST_ENTITIES' },
          { name: 'DELETE_TEST_ENTITIES' },
        ],
      },
    });
    setRuntimeContext(req, {
      mode: 'admin',
      projectSlug: null,
      headerEnvironment: 'stage',
      headerProjectSlug: 'demo-tour',
    });
    next();
  };
}

function buildHarness() {
  const calls: RecordedCall[] = [];
  const service: EntityRouterService<Record<string, unknown>, Record<string, unknown>> = {
    create: (options) => {
      calls.push({ name: 'create', payload: options });
      return Promise.resolve({ id: ENTITY_ID, ...options.data });
    },
    update: (options) => {
      calls.push({ name: 'update', payload: options });
      return Promise.resolve(true);
    },
    remove: (options) => {
      calls.push({ name: 'remove', payload: options });
      return Promise.resolve(true);
    },
    deleteByIds: (options) => {
      calls.push({ name: 'deleteByIds', payload: options });
      return Promise.resolve(true);
    },
    bulkImport: () => {
      calls.push({ name: 'bulkImport', payload: null });
      return Promise.resolve();
    },
  };
  const dbApi: EntityRouterDbApi = {
    MODEL: {
      rawAttributes: {
        id: {},
        name: {},
        createdAt: {},
      },
    },
    findAll: (query, options) => {
      calls.push({ name: 'findAll', payload: { query, options } });
      return Promise.resolve({
        rows: [{ id: ENTITY_ID, name: 'Lobby' }],
        count: 1,
      });
    },
    findAllAutocomplete: (options) => {
      calls.push({ name: 'findAllAutocomplete', payload: options });
      return Promise.resolve([{ id: ENTITY_ID, label: 'Lobby' }]);
    },
    findBy: (options) => {
      calls.push({ name: 'findBy', payload: options });
      return Promise.resolve({ id: ENTITY_ID, name: 'Lobby' });
    },
  };

  const app = express();
  app.use(contextMiddleware());
  app.use('/entities', createEntityRouter('test_entities', service, dbApi));
  app.use(commonErrorHandler);

  return { app, calls };
}

interface AppRequestOptions {
  method: RequestMethod;
  url: string;
  headers?: Headers;
  body?: Body;
}

function dispatchApp(app: express.Express, options: AppRequestOptions) {
  const requestOptions: RequestOptions = {
    method: options.method,
    url: options.url,
  };
  if (options.headers !== undefined) {
    requestOptions.headers = options.headers;
  }
  if (options.body !== undefined) {
    requestOptions.body = options.body;
  }

  const req = createRequest(requestOptions);
  const res = createResponse({ eventEmitter: EventEmitter });

  return new Promise<typeof res>((resolve, reject) => {
    res.on('end', () => resolve(res));
    app(req, res, (error?: unknown) => {
      if (error) {
        reject(
          error instanceof Error
            ? error
            : new Error('Express app returned a non-Error callback value.'),
        );
        return;
      }
      resolve(res);
    });
  });
}

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === 'object' && value !== null;
}

function asRecord(value: unknown): Record<string, unknown> {
  if (isRecord(value)) return value;
  throw new TypeError('Expected value to be an object record.');
}

void test('createEntityRouter passes current user, runtime context, and host into create service calls', async () => {
  const { app, calls } = buildHarness();
  const response = await dispatchApp(app, {
    method: 'POST',
    url: '/entities',
    headers: {
      referer: 'https://builder.example.test/projects',
    },
    body: { data: { name: 'Lobby' } },
  });

  assert.equal(response.statusCode, 200);
  assert.deepEqual(response._getData(), { id: ENTITY_ID, name: 'Lobby' });

  const call = calls.find((item) => item.name === 'create');
  assert.ok(call);
  const payload = asRecord(call.payload);
  assert.equal(payload.host, 'https://builder.example.test');
  assert.equal(asRecord(payload.currentUser).id, USER_ID);
  assert.equal(
    asRecord(payload.runtimeContext).headerProjectSlug,
    'demo-tour',
  );
});

void test('createEntityRouter normalizes list query controls and preserves filters', async () => {
  const { app, calls } = buildHarness();
  const response = await dispatchApp(app, {
    method: 'GET',
    url: '/entities?limit=1000&page=2&sort=asc&field=name&unknown=keep',
  });

  assert.equal(response.statusCode, 200);
  assert.deepEqual(response._getData(), {
    rows: [{ id: ENTITY_ID, name: 'Lobby' }],
    count: 1,
  });

  const call = calls.find((item) => item.name === 'findAll');
  assert.ok(call);
  const payload = asRecord(call.payload);
  assert.deepEqual(payload.query, {
    limit: 1000,
    page: 2,
    unknown: 'keep',
    sort: 'ASC',
    field: 'name',
  });
  assert.equal(asRecord(payload.options).currentUser !== undefined, true);
});

void test('createEntityRouter rejects mismatched body ids before update service call', async () => {
  const { app, calls } = buildHarness();
  const response = await dispatchApp(app, {
    method: 'PUT',
    url: `/entities/${ENTITY_ID}`,
    body: {
      data: {
        id: '6a373ead-7ff4-4f1c-9a69-29ff1e97420d',
        name: 'Mismatch',
      },
    },
  });

  assert.equal(response.statusCode, 400);
  assert.equal(response._getData(), 'Request body id does not match route id');
  assert.equal(calls.some((item) => item.name === 'update'), false);
});

void test('createEntityRouter emits CSV exports with configured fields', async () => {
  const { app } = buildHarness();
  const response = await dispatchApp(app, {
    method: 'GET',
    url: '/entities?filetype=csv',
  });

  assert.equal(response.statusCode, 200);
  const disposition: unknown = response.getHeader('content-disposition');
  if (typeof disposition !== 'string') {
    throw new TypeError('Expected content-disposition response header.');
  }
  assert.match(disposition, /export\.csv/);
  const csvPayload: unknown = response._getData();
  if (typeof csvPayload !== 'string') {
    throw new TypeError('Expected CSV response body.');
  }
  assert.equal(
    csvPayload.trim(),
    '"id","createdAt"\n"aa0b89ab-b0db-4d6c-a59c-c7785fc3eae5",',
  );
});