import { Eltro as t, assert, stub } from 'eltro'
import fs from 'fs/promises'
import Core from '../core/core.mjs'
import Util from '../core/util.mjs'
import { createFakeLog } from './helpers.mjs'
import StaticProvider from '../core/providers/static.mjs'
import lowdb from '../core/db.mjs'

const util = new Util(import.meta.url)
const log = createFakeLog()
let db

t.before(function() {
  return lowdb({}, log, null).then(function(res) {
    db = res
  })
})

t.describe('Core.addProvider()', function() {
  t.beforeEach(function() {
    Core.providers.clear()
  })

  t.after(function() {
    Core.providers.clear()
  })

  t.test('should fail if name is not a string', function() {
    let tests = [
      [1, 'number'],
      [0, 'false number'],
      ['', 'false string'],
      [[], 'array'],
      [{}, 'object'],
    ]

    tests.forEach(function(check) {
      assert.throws(function() {
        Core.addProvider(check[0], StaticProvider)
      }, function(err) {
        assert.match(err.message, /name/i)
        assert.match(err.message, /string/i)
        return true
      }, `throw if name is ${check[1]}`)
    })
  })
  
  t.test('should fail if provider not a function', function() {
    let tests = [
      [1, 'number'],
      [0, 'false number'],
      ['asdf', 'string'],
      ['', 'false string'],
      [[], 'array'],
      [{}, 'object'],
    ]

    tests.forEach(function(check) {
      assert.throws(function() {
        Core.addProvider('insertname', check[0])
      }, function(err) {
        assert.match(err.message, /provider/i)
        assert.match(err.message, /class/i)
        assert.match(err.message, /insertname/i)
        return true
      }, `throw if provider is ${check[1]}`)
    })
  })
  
  t.test('should fail if provider instance is missing checkConfig', function() {
    let tests = [
      [1, 'number'],
      [0, 'false number'],
      ['asdf', 'string'],
      ['', 'false string'],
      [[], 'array'],
      [{}, 'object'],
    ]

    tests.forEach(function(check) {
      assert.throws(function() {
        let provider = function() { this.getLatestVersion = function() {}; this.checkConfig = check[0] }
        Core.addProvider('somename', provider)
      }, function(err) {
        assert.match(err.message, /provider/i)
        assert.match(err.message, /class/i)
        assert.match(err.message, /missing/i)
        assert.match(err.message, /checkConfig/i)
        assert.match(err.message, /somename/i)
        return true
      }, `throw if provider checkConfig is ${check[1]}`)
    })
  })
  
  t.test('should fail if provider instance is missing getLatestVersion', function() {
    let tests = [
      [1, 'number'],
      [0, 'false number'],
      ['asdf', 'string'],
      ['', 'false string'],
      [[], 'array'],
      [{}, 'object'],
    ]

    tests.forEach(function(check) {
      assert.throws(function() {
        let provider = function() { this.checkConfig = function() {}; this.getLatestVersion = check[0] }
        Core.addProvider('somename', provider)
      }, function(err) {
        assert.match(err.message, /provider/i)
        assert.match(err.message, /class/i)
        assert.match(err.message, /missing/i)
        assert.match(err.message, /getLatestVersion/i)
        assert.match(err.message, /somename/i)
        return true
      }, `throw if provider getLatestVersion is ${check[1]}`)
    })
  })

  t.test('should otherwise add provider to map', function() {
    assert.strictEqual(Core.providers.size, 0)
    Core.addProvider('testnamehere', StaticProvider)
    assert.strictEqual(Core.providers.size, 1)
    assert.strictEqual(Core.providers.get('testnamehere'), StaticProvider)
  })
})

t.describe('#constructor()', function() {
  t.test('should throw if close is not a function', function() {
    let tests = [
      [1, 'number'],
      [0, 'false number'],
      ['asdf', 'string'],
      ['', 'false string'],
      [[], 'array'],
      [{}, 'object'],
    ]

    tests.forEach(function(check) {
      assert.throws(function() {
        new Core(db, util, log, check[0])
      }, function(err) {
        assert.match(err.message, /restart/i)
        assert.match(err.message, /function/i)
        return true
      }, `throw if restart is ${check[1]}`)
    })
  })

  t.test('should throw if util is not util', function() {
    let tests = [
      [1, 'number'],
      [0, 'false number'],
      ['asdf', 'string'],
      ['', 'false string'],
      [[], 'array'],
      [{}, 'object'],
      [Util, 'not instance'],
    ]

    tests.forEach(function(check) {
      assert.throws(function() {
        new Core(db, check[0], log, function() {})
      }, function(err) {
        assert.match(err.message, /util/i)
        assert.match(err.message, /instance/i)
        return true
      }, `throw if util is ${check[1]}`)
    })
  })
  
  t.test('should throw if db is not lowdb', function() {
    let tests = [
      [1, 'number'],
      [0, 'false number'],
      ['asdf', 'string'],
      ['', 'false string'],
      [[], 'array'],
      [{}, 'object'],
      [lowdb.Low, 'not instance'],
    ]

    tests.forEach(function(check) {
      assert.throws(function() {
        new Core(check[0], util, log, function() {})
      }, function(err) {
        assert.match(err.message, /db/i)
        assert.match(err.message, /instance/i)
        return true
      }, `throw if db is ${check[1]}`)
    })
  })
  
  t.test('should throw if log is not an object with event', function() {
    let func = function() {}
    let validEvent = { info: func, warn: func, error: func }
    let tests = [
      [1, 'number'],
      [0, 'false number'],
      [null, 'null'],
      [undefined, 'undefined'],
      ['asdf', 'string'],
      ['', 'false string'],
      [[], 'array'],
      [{}, 'object'],
      [{warn: func, event: validEvent }, 'log only warn'],
      [{error: func, event: validEvent }, 'log only error'],
      [{info: func, event: validEvent }, 'log only info'],
      [{warn: func, error: func, event: validEvent }, 'log only warn and error'],
      [{warn: func, info: func, event: validEvent }, 'log only warn and info'],
      [{error: func, info: func, event: validEvent }, 'log only error and info'],
      [{ warn: func, error: func, info: func, event: { warn: func } }, 'event only warn'],
      [{ warn: func, error: func, info: func, event: { error: func } }, 'event only error'],
      [{ warn: func, error: func, info: func, event: { info: func } }, 'event only info'],
      [{ warn: func, error: func, info: func, event: { warn: func, error: func } }, 'event only warn and error'],
      [{ warn: func, error: func, info: func, event: { warn: func, info: func } }, 'event only warn and info'],
      [{ warn: func, error: func, info: func, event: { error: func, info: func } }, 'event only error and info'],
    ]

    tests.forEach(function(check) {
      assert.throws(function() {
        new Core(db, util, check[0], func)
      }, function(err) {
        assert.match(err.message, /log/i)
        assert.match(err.message, /valid/i)
        return true
      }, `throw if log is ${check[1]}`)
    })
  })

  t.test('should accept log, util and close function', function() {
    const assertLog = log
    const assertClose = function() {}

    let core = new Core(db, util, assertLog, assertClose)
    assert.strictEqual(core.db, db)
    assert.strictEqual(core.util, util)
    assert.strictEqual(core.log, assertLog)
    assert.strictEqual(core.restart, assertClose)
    assert.deepStrictEqual(core.applications, [])
    assert.ok(core.applicationMap)
  })
})

t.describe('#getApplication()', function() {

  t.test('should return application based on the name', function() {
    const assertName = 'Yami no Naka'
    const assertApplication = { a: 1 }
    let core = new Core(db, util, log, function() {})
    core.applicationMap.set(assertName, assertApplication)
    assert.strictEqual(core.getApplication(assertName), assertApplication)
  })
})

t.describe('#init()', function() {
  const assertProviderName = 'Kyousuu Gakku Gogyou Kikan'
  let core
  let fakeUtil
  let fakeProvider
  let fakeProviderConfig

  function FakeProvider(config) {
    fakeProvider(config)
    this.static = true
    this.checkConfig = fakeProviderConfig
  }

  t.beforeEach(function() {
    core = new Core(db, util, createFakeLog(), function() {})
    core.util = fakeUtil = {
      verifyConfig: stub(),
      getAppNames: stub().returns([]),
    }
    fakeProvider = stub()
    fakeProviderConfig = stub()
    Core.providers.set(assertProviderName, FakeProvider)
  })

  t.test('it should call util.verifyConfig correctly', async function() {
    const assertError = new Error('Red faction IO drive mix')
    const assertConfig = { a: 1 }
    db.config = assertConfig
    fakeUtil.verifyConfig.throws(assertError)

    let err = await assert.isRejected(core.init())
    assert.strictEqual(err, assertError)
    assert.strictEqual(fakeUtil.verifyConfig.firstCall[0], assertConfig)
  })

  t.test('should call util.getNames correctly', async function() {
    const assertError = new Error('Hero within')
    const assertConfig = { a: 1 }
    db.config = assertConfig
    fakeUtil.getAppNames.throws(assertError)

    let err = await assert.isRejected(core.init())
    assert.strictEqual(err, assertError)
    assert.strictEqual(fakeUtil.getAppNames.firstCall[0], assertConfig)
  })

  t.test('should call provider constructor correctly', async function() {
    const assertError = new Error('Funny days')
    const assertAppName = 'Tsuugakuro'
    const assertConfig = {
      [assertAppName]: {
        provider: assertProviderName,
      }
    }
    db.config = assertConfig
    fakeProvider.throws(assertError)
    fakeUtil.getAppNames.returns([assertAppName])
    
    let err = await assert.isRejected(core.init())
    assert.strictEqual(err, assertError)
    assert.strictEqual(fakeProvider.firstCall[0], assertConfig[assertAppName])
  })

  t.test('should call provider checkConfig correctly', async function() {
    const assertAppName = 'Zetsubou'
    const assertConfig = {
      [assertAppName]: {
        provider: assertProviderName,
      }
    }
    db.config = assertConfig

    const assertError = new Error('Shousou')
    fakeProviderConfig.rejects(assertError)
    fakeUtil.getAppNames.returns([assertAppName])
    
    let err = await assert.isRejected(core.init())
    assert.strictEqual(err, assertError)
    assert.strictEqual(fakeProviderConfig.firstCall[0], assertConfig[assertAppName])
  })

  t.test('should create an application with the provider and name and config', async function() {
    const assertAppName = 'Yasashii Ketsumatsu'
    const assertTestString = 'Serozore no Omoi'
    const assertConfig = {
      [assertAppName]: {
        provider: assertProviderName,
        teststring: assertTestString,
      }
    }
    db.config = assertConfig
    fakeUtil.getAppNames.returns([assertAppName])
    assert.strictEqual(core.applications.length, 0)

    await core.init()
    let application = core.getApplication(assertAppName)
    
    assert.ok(application)
    assert.strictEqual(core.applications.length, 1)
    assert.strictEqual(core.applications[0], application)
    assert.strictEqual(application.name, assertAppName)
    assert.strictEqual(application.ctx.db, core.db)
    assert.strictEqual(application.ctx.util, core.util)
    assert.strictEqual(application.ctx.log, core.log)
    assert.strictEqual(application.ctx.core, core)
    assert.strictEqual(application.config.teststring, assertTestString)
    assert.ok(application.fresh)
    assert.ok(application.provider instanceof FakeProvider)
  })
})