const tsconfig = require('tsconfig')
const cache = require('./cache')
const deprecate = require('./deprecate')
const logger = require('./logger')
const path = require('path')

const defaultTypescriptConfig = {
  'compilerOptions': {
    'target': 'es5',
    'lib': [
      'dom',
      'es6'
    ],
    'module': 'es2015',
    'moduleResolution': 'node',
    'types': ['vue-typescript-import-dts', 'jest', 'node'],
    'isolatedModules': false,
    'experimentalDecorators': true,
    'noImplicitAny': true,
    'noImplicitThis': true,
    'strictNullChecks': true,
    'removeComments': true,
    'emitDecoratorMetadata': true,
    'suppressImplicitAnyIndexErrors': true,
    'allowSyntheticDefaultImports': true,
    'sourceMap': true,
    'allowJs': true
  }
}

module.exports.loadTypescriptConfig = function loadTypescriptConfig (vueJestConfig) {
  const find = () => {
    const { path, config } = tsconfig.loadSync(process.cwd())

    if (!path) {
      logger.info('no tsconfig.json found, defaulting to default typescript options')
    }

    return path ? config : defaultTypescriptConfig
  }
  const cachedConfig = cache.get('typescript-config')
  if (cachedConfig) {
    return cachedConfig
  } else {
    let typescriptConfig

    if (vueJestConfig.tsConfigFile) {
      deprecate.replace('tsConfigFile', 'tsConfig')
      typescriptConfig = tsconfig.readFileSync(vueJestConfig.tsConfigFile)
    } else if (vueJestConfig.hasOwnProperty('tsConfig')) {
      switch (typeof vueJestConfig.tsConfig) {
        case 'string':
          // a path to a config file is being passed in; load it
          const tsConfigPath = path.resolve(process.cwd(), vueJestConfig.tsConfig)
          typescriptConfig = require(tsConfigPath)
          break
        case 'boolean':
          // if tsConfig is true, search for it
          if (vueJestConfig.tsConfig === true) {
            typescriptConfig = find()
          } else {
            // use default typescript options
            typescriptConfig = defaultTypescriptConfig
          }
          break
        case 'object':
        default:
          // support for inline typescript options
          typescriptConfig = vueJestConfig.tsConfig
          break
      }
    } else {
      typescriptConfig = find()
    }

    cache.set('typescript-config', typescriptConfig)
    return typescriptConfig
  }
}

module.exports.defaultConfig = defaultTypescriptConfig