import path from 'path'
import webpack from 'webpack'
import MemoeryFS from 'memory-fs'
import { createBundleRenderer } from '../../packages/vue-server-renderer'

const rendererCache = {}
function createRenderer (file, cb, options) {
  if (!options && rendererCache[file]) {
    return cb(rendererCache[file])
  }
  const compiler = webpack({
    target: 'node',
    entry: path.resolve(__dirname, 'fixtures', file),
    output: {
      path: '/',
      filename: 'bundle.js',
      libraryTarget: 'commonjs2'
    },
    module: {
      loaders: [{ test: /\.js$/, loader: 'babel' }]
    }
  })
  const fs = new MemoeryFS()
  compiler.outputFileSystem = fs
  compiler.run((err, stats) => {
    expect(err).toBeFalsy()
    expect(stats.errors).toBeFalsy()
    const code = fs.readFileSync('/bundle.js', 'utf-8')
    const renderer = rendererCache[file] = createBundleRenderer(code, options)
    cb(renderer)
  })
}

describe('SSR: bundle renderer', () => {
  it('renderToString', done => {
    createRenderer('app.js', renderer => {
      const context = { url: '/test' }
      renderer.renderToString(context, (err, res) => {
        expect(err).toBeNull()
        expect(res).toBe('<div server-rendered="true">&sol;test</div>')
        expect(context.msg).toBe('hello')
        done()
      })
    })
  })

  it('renderToStream', done => {
    createRenderer('app.js', renderer => {
      const context = { url: '/test' }
      const stream = renderer.renderToStream(context)
      let res = ''
      stream.on('data', chunk => {
        res += chunk.toString()
      })
      stream.on('end', () => {
        expect(res).toBe('<div server-rendered="true">&sol;test</div>')
        expect(context.msg).toBe('hello')
        done()
      })
    })
  })

  it('renderToString catch error', done => {
    createRenderer('error.js', renderer => {
      renderer.renderToString(err => {
        expect(err.message).toBe('foo')
        done()
      })
    })
  })

  it('renderToStream catch error', done => {
    createRenderer('error.js', renderer => {
      const stream = renderer.renderToStream()
      stream.on('error', err => {
        expect(err.message).toBe('foo')
        done()
      })
    })
  })

  it('render with cache (get/set)', done => {
    const cache = {}
    const get = jasmine.createSpy('get')
    const set = jasmine.createSpy('set')
    const options = {
      cache: {
        // async
        get: (key, cb) => {
          setTimeout(() => {
            get(key)
            cb(cache[key])
          }, 0)
        },
        set: (key, val) => {
          set(key, val)
          cache[key] = val
        }
      }
    }
    createRenderer('cache.js', renderer => {
      const expected = '<div server-rendered="true">&sol;test</div>'
      const key = '1::1'
      renderer.renderToString((err, res) => {
        expect(err).toBeNull()
        expect(res).toBe(expected)
        expect(get).toHaveBeenCalledWith(key)
        expect(set).toHaveBeenCalledWith(key, expected)
        expect(cache[key]).toBe(expected)
        renderer.renderToString((err, res) => {
          expect(err).toBeNull()
          expect(res).toBe(expected)
          expect(get.calls.count()).toBe(2)
          expect(set.calls.count()).toBe(1)
          done()
        })
      })
    }, options)
  })

  it('render with cache (get/set/has)', done => {
    const cache = {}
    const has = jasmine.createSpy('has')
    const get = jasmine.createSpy('get')
    const set = jasmine.createSpy('set')
    const options = {
      cache: {
        // async
        has: (key, cb) => {
          has(key)
          cb(!!cache[key])
        },
        // sync
        get: key => {
          get(key)
          return cache[key]
        },
        set: (key, val) => {
          set(key, val)
          cache[key] = val
        }
      }
    }
    createRenderer('cache.js', renderer => {
      const expected = '<div server-rendered="true">&sol;test</div>'
      const key = '1::1'
      renderer.renderToString((err, res) => {
        expect(err).toBeNull()
        expect(res).toBe(expected)
        expect(has).toHaveBeenCalledWith(key)
        expect(get).not.toHaveBeenCalled()
        expect(set).toHaveBeenCalledWith(key, expected)
        expect(cache[key]).toBe(expected)
        renderer.renderToString((err, res) => {
          expect(err).toBeNull()
          expect(res).toBe(expected)
          expect(has.calls.count()).toBe(2)
          expect(get.calls.count()).toBe(1)
          expect(set.calls.count()).toBe(1)
          done()
        })
      })
    }, options)
  })
})