const { expect } = require('chai')
const { promisify } = require('util')

const OError = require('..')

const {
  expectError,
  expectFullStackWithoutStackFramesToEqual,
} = require('./support')

describe('OError.tag', function () {
  it('tags errors thrown from an async function', async function () {
    const delay = promisify(setTimeout)

    async function foo() {
      await delay(10)
      throw new Error('foo error')
    }

    async function bar() {
      try {
        await foo()
      } catch (error) {
        throw OError.tag(error, 'failed to bar', { bar: 'baz' })
      }
    }

    async function baz() {
      try {
        await bar()
      } catch (error) {
        throw OError.tag(error, 'failed to baz', { baz: 'bat' })
      }
    }

    try {
      await baz()
      expect.fail('should have thrown')
    } catch (error) {
      expectError(error, {
        name: 'Error',
        klass: Error,
        message: 'Error: foo error',
        firstFrameRx: /at foo/,
      })
      expectFullStackWithoutStackFramesToEqual(error, [
        'Error: foo error',
        'TaggedError: failed to bar',
        'TaggedError: failed to baz',
      ])
      expect(OError.getFullInfo(error)).to.eql({
        bar: 'baz',
        baz: 'bat',
      })
    }
  })

  it('tags errors thrown from a promise rejection', async function () {
    function foo() {
      return new Promise((resolve, reject) => {
        setTimeout(function () {
          reject(new Error('foo error'))
        }, 10)
      })
    }

    async function bar() {
      try {
        await foo()
      } catch (error) {
        throw OError.tag(error, 'failed to bar', { bar: 'baz' })
      }
    }

    async function baz() {
      try {
        await bar()
      } catch (error) {
        throw OError.tag(error, 'failed to baz', { baz: 'bat' })
      }
    }

    try {
      await baz()
      expect.fail('should have thrown')
    } catch (error) {
      expectError(error, {
        name: 'Error',
        klass: Error,
        message: 'Error: foo error',
        firstFrameRx: /_onTimeout/,
      })
      expectFullStackWithoutStackFramesToEqual(error, [
        'Error: foo error',
        'TaggedError: failed to bar',
        'TaggedError: failed to baz',
      ])
      expect(OError.getFullInfo(error)).to.eql({
        bar: 'baz',
        baz: 'bat',
      })
    }
  })

  it('tags errors yielded through callbacks', function (done) {
    function foo(cb) {
      setTimeout(function () {
        cb(new Error('foo error'))
      }, 10)
    }

    function bar(cb) {
      foo(function (err) {
        if (err) {
          return cb(OError.tag(err, 'failed to bar', { bar: 'baz' }))
        }
        cb()
      })
    }

    function baz(cb) {
      bar(function (err) {
        if (err) {
          return cb(OError.tag(err, 'failed to baz', { baz: 'bat' }))
        }
        cb()
      })
    }

    baz(function (err) {
      if (err) {
        expectError(err, {
          name: 'Error',
          klass: Error,
          message: 'Error: foo error',
          firstFrameRx: /_onTimeout/,
        })
        expectFullStackWithoutStackFramesToEqual(err, [
          'Error: foo error',
          'TaggedError: failed to bar',
          'TaggedError: failed to baz',
        ])
        expect(OError.getFullInfo(err)).to.eql({
          bar: 'baz',
          baz: 'bat',
        })
        return done()
      }
      expect.fail('should have yielded an error')
    })
  })

  it('is not included in the stack trace if using capture', function () {
    if (!Error.captureStackTrace) return this.skip()
    const err = new Error('test error')
    OError.tag(err, 'test message')
    const stack = OError.getFullStack(err)
    expect(stack).to.match(/TaggedError: test message\n\s+at/)
    expect(stack).to.not.match(/TaggedError: test message\n\s+at [\w.]*tag/)
  })

  describe('without Error.captureStackTrace', function () {
    /* eslint-disable mocha/no-hooks-for-single-case */
    before(function () {
      this.originalCaptureStackTrace = Error.captureStackTrace
      Error.captureStackTrace = null
    })
    after(function () {
      Error.captureStackTrace = this.originalCaptureStackTrace
    })

    it('still captures a stack trace, albeit including itself', function () {
      const err = new Error('test error')
      OError.tag(err, 'test message')
      expectFullStackWithoutStackFramesToEqual(err, [
        'Error: test error',
        'TaggedError: test message',
      ])
      const stack = OError.getFullStack(err)
      expect(stack).to.match(/TaggedError: test message\n\s+at [\w.]*tag/)
    })
  })

  describe('with limit on the number of tags', function () {
    before(function () {
      this.originalMaxTags = OError.maxTags
      OError.maxTags = 3
    })
    after(function () {
      OError.maxTags = this.originalMaxTags
    })

    it('should not tag more than that', function () {
      const err = new Error('test error')
      OError.tag(err, 'test message 1')
      OError.tag(err, 'test message 2')
      OError.tag(err, 'test message 3')
      OError.tag(err, 'test message 4')
      OError.tag(err, 'test message 5')
      expectFullStackWithoutStackFramesToEqual(err, [
        'Error: test error',
        'TaggedError: test message 1',
        'TaggedError: ... dropped tags',
        'TaggedError: test message 4',
        'TaggedError: test message 5',
      ])
    })

    it('should handle deep recursion', async function () {
      async function recursiveAdd(n) {
        try {
          if (n === 0) throw new Error('deep error')
          const result = await recursiveAdd(n - 1)
          return result + 1
        } catch (err) {
          throw OError.tag(err, `at level ${n}`)
        }
      }
      try {
        await recursiveAdd(10)
      } catch (err) {
        expectFullStackWithoutStackFramesToEqual(err, [
          'Error: deep error',
          'TaggedError: at level 0',
          'TaggedError: ... dropped tags',
          'TaggedError: at level 9',
          'TaggedError: at level 10',
        ])
      }
    })

    it('should handle a singleton error', function (done) {
      const err = new Error('singleton error')
      function endpoint(callback) {
        helper((err) => callback(err && OError.tag(err, 'in endpoint')))
      }
      function helper(callback) {
        libraryFunction((err) => callback(err && OError.tag(err, 'in helper')))
      }
      function libraryFunction(callback) {
        callback(err)
      }

      endpoint(() => {
        endpoint((err) => {
          expect(err).to.exist
          expectFullStackWithoutStackFramesToEqual(err, [
            'Error: singleton error',
            'TaggedError: in helper',
            'TaggedError: ... dropped tags',
            'TaggedError: in helper',
            'TaggedError: in endpoint',
          ])
          done()
        })
      })
    })
  })
})

describe('OError.getFullInfo', function () {
  it('works when given null', function () {
    expect(OError.getFullInfo(null)).to.deep.equal({})
  })

  it('works on a normal error', function () {
    const err = new Error('foo')
    expect(OError.getFullInfo(err)).to.deep.equal({})
  })

  it('works on an error with tags', function () {
    const err = OError.tag(new Error('foo'), 'bar', { userId: 123 })
    expect(OError.getFullInfo(err)).to.deep.equal({ userId: 123 })
  })

  it('merges info from an error and its tags', function () {
    const err = new OError('foo').withInfo({ projectId: 456 })
    OError.tag(err, 'failed to foo', { userId: 123 })
    expect(OError.getFullInfo(err)).to.deep.equal({
      projectId: 456,
      userId: 123,
    })
  })

  it('merges info from a cause', function () {
    const err1 = new Error('foo')
    const err2 = new Error('bar')
    err1.cause = err2
    err2.info = { userId: 123 }
    expect(OError.getFullInfo(err1)).to.deep.equal({ userId: 123 })
  })

  it('merges info from a nested cause', function () {
    const err1 = new Error('foo')
    const err2 = new Error('bar')
    const err3 = new Error('baz')
    err1.cause = err2
    err2.info = { userId: 123 }
    err2.cause = err3
    err3.info = { foo: 42 }
    expect(OError.getFullInfo(err1)).to.deep.equal({
      userId: 123,
      foo: 42,
    })
  })

  it('merges info from cause with duplicate keys', function () {
    const err1 = new Error('foo')
    const err2 = new Error('bar')
    err1.info = { userId: 42, foo: 1337 }
    err1.cause = err2
    err2.info = { userId: 1 }
    expect(OError.getFullInfo(err1)).to.deep.equal({
      userId: 42,
      foo: 1337,
    })
  })

  it('merges info from tags with duplicate keys', function () {
    const err1 = OError.tag(new Error('foo'), 'bar', { userId: 123 })
    const err2 = OError.tag(err1, 'bat', { userId: 456 })
    expect(OError.getFullInfo(err2)).to.deep.equal({ userId: 456 })
  })

  it('works on an error with .info set to a string', function () {
    const err = new Error('foo')
    err.info = 'test'
    expect(OError.getFullInfo(err)).to.deep.equal({})
  })
})

describe('OError.getFullStack', function () {
  it('works when given null', function () {
    expect(OError.getFullStack(null)).to.equal('')
  })

  it('works on a normal error', function () {
    const err = new Error('foo')
    const fullStack = OError.getFullStack(err)
    expect(fullStack).to.match(/^Error: foo$/m)
    expect(fullStack).to.match(/^\s+at /m)
  })

  it('works on an error with a cause', function () {
    const err1 = new Error('foo')
    const err2 = new Error('bar')
    err1.cause = err2

    const fullStack = OError.getFullStack(err1)
    expect(fullStack).to.match(/^Error: foo$/m)
    expect(fullStack).to.match(/^\s+at /m)
    expect(fullStack).to.match(/^caused by:\n\s+Error: bar$/m)
  })

  it('works on both tags and causes', async function () {
    // Here's the actual error.
    function tryToFoo() {
      try {
        throw Error('foo')
      } catch (error) {
        throw OError.tag(error, 'failed to foo', { foo: 1 })
      }
    }

    // Inside another function that wraps it.
    function tryToBar() {
      try {
        tryToFoo()
      } catch (error) {
        throw new OError('failed to bar').withCause(error)
      }
    }

    // And it is in another try.
    try {
      try {
        tryToBar()
        expect.fail('should have thrown')
      } catch (error) {
        throw OError.tag(error, 'failed to bat', { bat: 1 })
      }
    } catch (error) {
      // We catch the wrapping error.
      expectError(error, {
        name: 'OError',
        klass: OError,
        message: 'OError: failed to bar',
        firstFrameRx: /tryToBar/,
      })

      // But the stack contains all of the errors and tags.
      expectFullStackWithoutStackFramesToEqual(error, [
        'OError: failed to bar',
        'TaggedError: failed to bat',
        'caused by:',
        '    Error: foo',
        '    TaggedError: failed to foo',
      ])

      // The info from the wrapped cause should be picked up for logging.
      expect(OError.getFullInfo(error)).to.eql({ bat: 1, foo: 1 })

      // But it should still be recorded.
      expect(OError.getFullInfo(error.cause)).to.eql({ foo: 1 })
    }
  })
})