const defBench = require('./defBench')
// https://github.com/bestiejs/benchmark.js/issues/128
const _ = require('lodash')
const each = require('licia/each')
const $ = require('licia/$')
const isArr = require('licia/isArr')
const escape = require('licia/escape')
const map = require('licia/map')
const process = require('process')
const benchmark = require('benchmark')
const Benchmark = benchmark.runInContext({ _, process })
window.Benchmark = Benchmark

module.exports = function (eruda) {
  let { evalCss } = eruda.util

  class BenchmarkTool extends eruda.Tool {
    constructor() {
      super()
      this.name = 'benchmark'
      this.displayName = 'ベンチマーク'
      this._style = evalCss(require('./style.scss'))

      this._benches = []
    }
    init($el, container) {
      super.init($el, container)

      this._addDefBench()
      this._bindEvent()
    }
    show() {
      super.show()
    }
    hide() {
      super.hide()
    }
    destroy() {
      super.destroy()
      evalCss.remove(this._style)
    }
    add(name, fn) {
      return isArr(fn)
        ? this._addBenchSuite(name, fn)
        : this._addBench(name, fn)
    }
    _addBenchSuite(name, fns) {
      let benches = this._benches

      let self = this

      let bench = {
        name,
        result: null,
        stores: [],
        status: 'ready',
      }

      let suite = new Benchmark.Suite(name, {
        onStart() {
          bench.status = 'running'
          bench.stores = []
          bench.result = null
          self._render()
        },
        onCycle(e) {
          if (bench.status === 'error') return
          bench.stores.push(e.target)
          bench.result = formatBenches(bench.stores)
          self._updateResult(bench, bench.result)
        },
        onError(e) {
          bench.status = 'error'
          bench.result = e.message.message
          self._render()
        },
        onAbort() {
          if (bench.status === 'error') return
          bench.status = 'abort'
          self._render()
        },
        onComplete() {
          if (bench.status === 'error') return
          bench.status = 'complete'

          bench.result = formatBenches(bench.stores)
          self._render()
        },
      })

      each(fns, ({ name, fn }) => suite.add(name, fn))

      bench.bench = suite
      benches.push(bench)

      return this._render()
    }
    _addBench(name, fn) {
      let benches = this._benches

      let self = this

      let bench = {
        bench: new Benchmark(name, fn, {
          onStart() {
            bench.status = 'running'
            bench.result = null
            self._render()
          },
          onCycle() {
            if (bench.status === 'error') return
            bench.result = formatBench(this)
            self._updateResult(bench, bench.result)
          },
          onError(e) {
            bench.status = 'error'
            bench.result = e.message.message
            self._render()
          },
          onAbort() {
            if (bench.status === 'error') return
            bench.status = 'abort'
            self._render()
          },
          onComplete() {
            if (bench.status === 'error') return
            bench.status = 'complete'

            bench.result = formatBench(this)
            self._render()
          },
        }),
        name,
        result: null,
        status: 'ready',
      }
      benches.push(bench)

      return this._render()
    }
    remove(name) {
      let benches = this._benches

      for (let i = benches.length - 1; i >= 0; i--) {
        if (benches[i].name === name) benches.splice(i, 1)
      }

      return this._render()
    }
    clear() {
      this._benches = []

      return this._render()
    }
    run(name) {
      let benches = this._benches

      for (let i = 0, len = benches.length; i < len; i++) {
        if (benches[i].name === name) this._run(i)
      }

      return this
    }
    _render() {
      let benches = this._benches

      each(benches, (bench) => {
        bench.isRunning = bench.status === 'running'
      })

      const html = `<ul>
        ${map(benches, (bench, idx) => {
          return `<li>
            <h2 class="eruda-title">${escape(
              bench.name
            )}<span class="eruda-status">${bench.status}</span></h2>
            <div class="eruda-result" data-idx="${idx}">${
            bench.result || ''
          }</div>
            <div class="eruda-btn ${
              bench.isRunning ? 'eruda-disabled' : 'eruda-run'
            }" data-idx="${idx}">実行</div>
          </li>`
        }).join('')}
      </ul>`

      this._$el.html(html)

      return this
    }
    _run(idx) {
      this._benches[idx].bench.run({ async: true })
    }
    _updateResult(bench, result) {
      let benches = this._benches

      let i = 0
      for (let len = benches.length; i < len; i++) {
        if (benches[i] === bench) break
      }

      this._$el.find(`.eruda-result[data-idx="${i}"]`).html(result)
    }
    _addDefBench() {
      each(defBench, ({ name, fn }) => this.add(name, fn))
    }
    _bindEvent() {
      let self = this

      this._$el.on('click', '.eruda-run', function () {
        let idx = $(this).data('idx')

        self._run(idx)
      })
    }
  }

  return new BenchmarkTool()
}

function formatBench(bench, name) {
  let { hz, stats } = bench

  let ops = hz.toFixed(hz < 100 ? 2 : 0),
    deviation = stats.rme.toFixed(2),
    size = stats.sample.length

  return `
        <div class="eruda-result-item">
            ${
              name
                ? '<div class="eruda-result-item-name">' + name + '</div>  x '
                : ''
            }<div class="eruda-result-number">${ops}</div> ops/sec \xb1<div class="eruda-result-number">${deviation}</div>% (<div class="eruda-result-number">${size}</div> runs sampled)
        </div>
    `
}

function formatBenches(benches) {
  let result = []

  for (let i = 0, len = benches.length; i < len; i++) {
    let bench = benches[i]
    result.push(formatBench(bench, bench.name))
  }

  return result.join('')
}