const assert = require('assert')
const fs = require('fs')
const os = require('os')
const path = require('path')
const rimraf = require('rimraf')
const jf = require('../')

/* global describe it beforeEach afterEach */

describe('+ writeFile()', () => {
  let TEST_DIR

  beforeEach((done) => {
    TEST_DIR = path.join(os.tmpdir(), 'jsonfile-tests-writefile')
    rimraf.sync(TEST_DIR)
    fs.mkdir(TEST_DIR, done)
  })

  afterEach((done) => {
    rimraf.sync(TEST_DIR)
    done()
  })

  it('should serialize and write JSON', (done) => {
    const file = path.join(TEST_DIR, 'somefile2.json')
    const obj = { name: 'JP' }

    jf.writeFile(file, obj, (err) => {
      assert.ifError(err)
      fs.readFile(file, 'utf8', (err, data) => {
        assert.ifError(err)
        const obj2 = JSON.parse(data)
        assert.strictEqual(obj2.name, obj.name)

        // verify EOL
        assert.strictEqual(data[data.length - 1], '\n')
        done()
      })
    })
  })

  it('should write JSON, resolve promise', (done) => {
    const file = path.join(TEST_DIR, 'somefile2.json')
    const obj = { name: 'JP' }

    jf.writeFile(file, obj)
      .then(res => {
        fs.readFile(file, 'utf8', (err, data) => {
          assert.ifError(err)
          const obj2 = JSON.parse(data)
          assert.strictEqual(obj2.name, obj.name)

          // verify EOL
          assert.strictEqual(data[data.length - 1], '\n')
          done()
        })
      })
      .catch(err => {
        assert.ifError(err)
        done()
      })
  })

  describe('> when JSON replacer is set', () => {
    let file, sillyReplacer, obj

    beforeEach((done) => {
      file = path.join(TEST_DIR, 'somefile.json')
      sillyReplacer = function (k, v) {
        if (!(v instanceof RegExp)) return v
        return `regex:${v.toString()}`
      }

      obj = {
        name: 'jp',
        reg: /hello/g
      }

      done()
    })

    it('should replace JSON', (done) => {
      jf.writeFile(file, obj, { replacer: sillyReplacer }, (err) => {
        assert.ifError(err)

        const data = JSON.parse(fs.readFileSync(file))
        assert.strictEqual(data.name, 'jp')
        assert.strictEqual(typeof data.reg, 'string')
        assert.strictEqual(data.reg, 'regex:/hello/g')
        done()
      })
    })

    it('should replace JSON, resolve promise', (done) => {
      jf.writeFile(file, obj, { replacer: sillyReplacer })
        .then(res => {
          const data = JSON.parse(fs.readFileSync(file))
          assert.strictEqual(data.name, 'jp')
          assert.strictEqual(typeof data.reg, 'string')
          assert.strictEqual(data.reg, 'regex:/hello/g')
          done()
        })
        .catch(err => {
          assert.ifError(err)
          done()
        })
    })
  })

  describe('> when spaces passed as an option', () => {
    let file, obj
    beforeEach((done) => {
      file = path.join(TEST_DIR, 'somefile.json')
      obj = { name: 'jp' }
      done()
    })

    it('should write file with spaces', (done) => {
      jf.writeFile(file, obj, { spaces: 8 }, (err) => {
        assert.ifError(err)
        const data = fs.readFileSync(file, 'utf8')
        assert.strictEqual(data, `${JSON.stringify(obj, null, 8)}\n`)
        done()
      })
    })

    it('should write file with spaces, resolve the promise', (done) => {
      jf.writeFile(file, obj, { spaces: 8 })
        .then(res => {
          const data = fs.readFileSync(file, 'utf8')
          assert.strictEqual(data, `${JSON.stringify(obj, null, 8)}\n`)
          done()
        })
        .catch(err => {
          assert.ifError(err)
          done()
        })
    })
  })

  describe('> when spaces, EOL are passed as options', () => {
    let file, obj
    beforeEach((done) => {
      file = path.join(TEST_DIR, 'somefile.json')
      obj = { name: 'jp' }
      done()
    })

    it('should use EOL override', (done) => {
      jf.writeFile(file, obj, { spaces: 2, EOL: '***' }, (err) => {
        assert.ifError(err)
        const data = fs.readFileSync(file, 'utf8')
        assert.strictEqual(data, '{***  "name": "jp"***}***')
        done()
      })
    })

    it('should use EOL override, resolve the promise', (done) => {
      jf.writeFile(file, obj, { spaces: 2, EOL: '***' })
        .then(res => {
          const data = fs.readFileSync(file, 'utf8')
          assert.strictEqual(data, '{***  "name": "jp"***}***')
          done()
        })
        .catch(err => {
          assert.ifError(err)
          done()
        })
    })
  })
  describe('> when passing encoding string as options', () => {
    let file, obj
    beforeEach((done) => {
      file = path.join(TEST_DIR, 'somefile.json')
      obj = { name: 'jp' }
      done()
    })

    it('should not error', (done) => {
      jf.writeFile(file, obj, 'utf8', (err) => {
        assert.ifError(err)
        const data = fs.readFileSync(file, 'utf8')
        assert.strictEqual(data, `${JSON.stringify(obj)}\n`)
        done()
      })
    })

    it('should not error, resolve the promise', (done) => {
      jf.writeFile(file, obj, 'utf8')
        .then(res => {
          const data = fs.readFileSync(file, 'utf8')
          assert.strictEqual(data, `${JSON.stringify(obj)}\n`)
          done()
        })
        .catch(err => {
          assert.ifError(err)
          done()
        })
    })
  })

  describe('> when EOF option is set to a falsey value', () => {
    beforeEach((done) => {
      TEST_DIR = path.join(os.tmpdir(), 'jsonfile-tests-writefile')
      rimraf.sync(TEST_DIR)
      fs.mkdir(TEST_DIR, done)
    })

    afterEach((done) => {
      rimraf.sync(TEST_DIR)
      done()
    })

    it('should not have a the EOL symbol at the end of file', (done) => {
      const file = path.join(TEST_DIR, 'somefile2.json')
      const obj = { name: 'jp' }
      jf.writeFile(file, obj, { finalEOL: false }, (err) => {
        assert.ifError(err)
        fs.readFile(file, 'utf8', (_, rawData) => {
          const data = JSON.parse(rawData)
          assert.strictEqual(rawData[rawData.length - 1], '}')
          assert.strictEqual(data.name, obj.name)
          done()
        })
      })
    })

    it('should have a the EOL symbol at the end of file when finalEOL is a truth value in options', (done) => {
      const file = path.join(TEST_DIR, 'somefile2.json')
      const obj = { name: 'jp' }
      jf.writeFile(file, obj, { finalEOL: true }, (err) => {
        assert.ifError(err)
        fs.readFile(file, 'utf8', (_, rawData) => {
          const data = JSON.parse(rawData)
          assert.strictEqual(rawData[rawData.length - 1], '\n')
          assert.strictEqual(data.name, obj.name)
          done()
        })
      })
    })
  })

  // Prevent https://github.com/jprichardson/node-jsonfile/issues/81 from happening
  describe("> when callback isn't passed & can't serialize", () => {
    it('should not write an empty file, should reject the promise', function (done) {
      this.slow(1100)
      const file = path.join(TEST_DIR, 'somefile.json')
      const obj1 = { name: 'JP' }
      const obj2 = { person: obj1 }
      obj1.circular = obj2

      jf.writeFile(file, obj1)
        .catch(err => {
          assert(err)
          assert(!fs.existsSync(file))
          done()
        })
    })
  })
})