const fs = require('fs')
const path = require('path')
const cp = require('child_process')
const assert = require('assert')
const supertest = require('supertest')
const osTmpdir = require('os-tmpdir')
const tempWrite = require('temp-write')
const mkdirp = require('mkdirp')
const rimraf = require('rimraf')
const express = require('express')
const serverReady = require('server-ready')
const pkg = require('../../package.json')

let PORT = 3100

const middlewareFiles = {
  en: './fixtures/middlewares/en.js',
  jp: './fixtures/middlewares/jp.js'
}

function cli (args) {
  const bin = path.join(__dirname, '../../src/cli/bin')
  return cp.spawn('node', [bin, '-p', PORT].concat(args), {
    cwd: __dirname,
    stdio: ['pipe', process.stdout, process.stderr]
  })
}

describe('cli', () => {
  let child
  let request
  let dbFile
  let routesFile

  beforeEach(() => {
    dbFile = tempWrite.sync(
      JSON.stringify({
        posts: [
          { id: 1 },
          { _id: 2 }
        ]
      }),
      'db.json'
    )

    routesFile = tempWrite.sync(
      JSON.stringify({ '/blog/': '/' }),
      'routes.json'
    )

    ++PORT
    request = supertest(`http://localhost:${PORT}`)
  })

  afterEach(() => {
    child.kill()
  })

  describe('db.json', () => {
    beforeEach((done) => {
      child = cli([ dbFile ])
      serverReady(PORT, done)
    })

    it('should support JSON file', (done) => {
      request.get('/posts').expect(200, done)
    })

    it('should send CORS headers', (done) => {
      const origin = 'http://example.com'

      request.get('/posts')
        .set('Origin', origin)
        .expect('access-control-allow-origin', origin)
        .expect(200, done)
    })

    it('should update JSON file', (done) => {
      request.post('/posts')
        .send({ title: 'hello' })
        .end(() => {
          setTimeout(() => {
            const str = fs.readFileSync(dbFile, 'utf8')
            assert(str.indexOf('hello') !== -1)
            done()
          }, 1000)
        })
    })
  })

  describe('seed.js', () => {
    beforeEach((done) => {
      child = cli([ 'fixtures/seed.js' ])
      serverReady(PORT, done)
    })

    it('should support JS file', (done) => {
      request.get('/posts').expect(200, done)
    })
  })

  describe('http://localhost:8080/db', () => {
    beforeEach((done) => {
      const fakeServer = express()
      fakeServer.get('/db', (req, res) => {
        res.jsonp({ posts: [] })
      })
      fakeServer.listen(8080, () => {
        child = cli([ 'http://localhost:8080/db' ])
        serverReady(PORT, done)
      })
    })

    it('should support URL file', (done) => {
      request.get('/posts').expect(200, done)
    })
  })

  describe('db.json -r routes.json -m middleware.js -i _id --read-only', () => {
    beforeEach((done) => {
      child = cli([ dbFile, '-r', routesFile, '-m', middlewareFiles.en, '-i', '_id', '--read-only' ])
      serverReady(PORT, done)
    })

    it('should use routes.json and _id as the identifier', (done) => {
      request.get('/blog/posts/2').expect(200, done)
    })

    it('should apply middlewares', (done) => {
      request.get('/blog/posts/2').expect('X-Hello', 'World', done)
    })

    it('should allow only GET requests', (done) => {
      request.post('/blog/posts').expect(403, done)
    })
  })

  describe('db.json -m first-middleware.js second-middleware.js', () => {
    beforeEach((done) => {
      child = cli([ dbFile, '-m', middlewareFiles.en, middlewareFiles.jp ])
      serverReady(PORT, done)
    })

    it('should apply all middlewares', (done) => {
      request.get('/posts')
        .expect('X-Hello', 'World')
        .expect('X-Konnichiwa', 'Sekai', done)
    })
  })

  describe('db.json -d 1000', () => {
    beforeEach((done) => {
      child = cli([ dbFile, '-d', 1000 ])
      serverReady(PORT, done)
    })

    it('should delay response', (done) => {
      const start = new Date()
      request.get('/posts').expect(200, function (err) {
        const end = new Date()
        done(
          end - start > 1000
          ? err
          : new Error('Request wasn\'t delayed')
        )
      })
    })
  })

  describe('db.json -s fixtures/public -S /some/path/snapshots', () => {
    const snapshotsDir = path.join(osTmpdir(), 'snapshots')
    const publicDir = 'fixtures/public'

    beforeEach((done) => {
      rimraf.sync(snapshotsDir)
      mkdirp.sync(snapshotsDir)

      child = cli([ dbFile, '-s', publicDir, '-S', snapshotsDir ])
      serverReady(PORT, () => {
        child.stdin.write('s\n')
        setTimeout(done, 100)
      })
    })

    it('should serve fixtures/public', (done) => {
      request.get('/').expect(/Hello/, done)
    })

    it('should save a snapshot in snapshots dir', () => {
      assert.equal(fs.readdirSync(snapshotsDir).length, 1)
    })
  })

  describe('fixtures/seed.json --no-cors=true', () => {
    beforeEach((done) => {
      child = cli([ 'fixtures/seed.js', '--no-cors=true' ])
      serverReady(PORT, done)
    })

    it('should not send Access-Control-Allow-Origin headers', (done) => {
      const origin = 'http://example.com'

      request.get('/posts')
        .set('Origin', origin)
        .expect(200)
        .end((err, res) => {
          if (err) {
            done(err)
          } if ('access-control-allow-origin' in res.headers) {
            done(new Error('CORS headers were not excluded from response'))
          } else {
            done()
          }
        })
    })
  })

  describe('fixtures/seed.json --no-gzip=true', () => {
    beforeEach((done) => {
      child = cli([ 'fixtures/seed.js', '--no-gzip=true' ])
      serverReady(PORT, done)
    })

    it('should not set Content-Encoding to gzip', (done) => {
      request.get('/posts')
        .expect(200)
        .end(function (err, res) {
          if (err) {
            done(err)
          } else if ('content-encoding' in res.headers) {
            done(new Error('Content-Encoding is set to gzip'))
          } else {
            done()
          }
        })
    })
  })

  describe('--watch db.json -r routes.json', () => {
    beforeEach((done) => {
      child = cli([ '--watch', dbFile, '-r', routesFile ])
      serverReady(PORT, done)
    })

    it('should watch db file', (done) => {
      fs.writeFileSync(dbFile, JSON.stringify({ foo: [] }))
      setTimeout(() => {
        request.get('/foo').expect(200, done)
      }, 1000)
    })

    it('should watch routes file', function (done) {
      // Can be very slow
      this.timeout(10000)
      fs.writeFileSync(routesFile, JSON.stringify({ '/api/': '/' }))
      setTimeout(() => {
        request.get('/api/posts').expect(200, done)
      }, 9000)
    })
  })

  describe('db.json --config some-config.json', (done) => {
    beforeEach((done) => {
      child = cli([ dbFile, '--config', 'fixtures/config.json' ])
      serverReady(PORT, done)
    })

    it('should apply all middlewares', (done) => {
      request.get('/posts')
        .expect('X-Hello', 'World')
        .expect('X-Konnichiwa', 'Sekai', done)
    })
  })
})