import chalk from 'chalk'
import stripAnsi from 'next/dist/compiled/strip-ansi'
import textTable from 'next/dist/compiled/text-table'
import createStore from 'next/dist/compiled/unistore'
import formatWebpackMessages from '../../client/dev/error-overlay/format-webpack-messages'
import { OutputState, store as consoleStore } from './store'

export function startedDevelopmentServer(appUrl: string, bindAddr: string) {
  consoleStore.setState({ appUrl, bindAddr })
}

let previousClient: import('webpack').Compiler | null = null
let previousServer: import('webpack').Compiler | null = null

type CompilerDiagnosticsWithFile = {
  errors: { file: string | undefined; message: string }[] | null
  warnings: { file: string | undefined; message: string }[] | null
}

type CompilerDiagnostics = {
  errors: string[] | null
  warnings: string[] | null
}

type WebpackStatus =
  | { loading: true }
  | ({ loading: false } & CompilerDiagnostics)

type AmpStatus = {
  message: string
  line: number
  col: number
  specUrl: string | null
  code: string
}

export type AmpPageStatus = {
  [page: string]: { errors: AmpStatus[]; warnings: AmpStatus[] }
}

type BuildStatusStore = {
  client: WebpackStatus
  server: WebpackStatus
  amp: AmpPageStatus
}

enum WebpackStatusPhase {
  COMPILING = 1,
  COMPILED_WITH_ERRORS = 2,
  COMPILED_WITH_WARNINGS = 4,
  COMPILED = 5,
}

function getWebpackStatusPhase(status: WebpackStatus): WebpackStatusPhase {
  if (status.loading) {
    return WebpackStatusPhase.COMPILING
  }
  if (status.errors) {
    return WebpackStatusPhase.COMPILED_WITH_ERRORS
  }
  if (status.warnings) {
    return WebpackStatusPhase.COMPILED_WITH_WARNINGS
  }
  return WebpackStatusPhase.COMPILED
}

export function formatAmpMessages(amp: AmpPageStatus) {
  let output = chalk.bold('Amp Validation') + '\n\n'
  let messages: string[][] = []

  const chalkError = chalk.red('error')
  function ampError(page: string, error: AmpStatus) {
    messages.push([page, chalkError, error.message, error.specUrl || ''])
  }

  const chalkWarn = chalk.yellow('warn')
  function ampWarn(page: string, warn: AmpStatus) {
    messages.push([page, chalkWarn, warn.message, warn.specUrl || ''])
  }

  for (const page in amp) {
    let { errors, warnings } = amp[page]

    const devOnlyFilter = (err: AmpStatus) => err.code !== 'DEV_MODE_ONLY'
    errors = errors.filter(devOnlyFilter)
    warnings = warnings.filter(devOnlyFilter)
    if (!(errors.length || warnings.length)) {
      // Skip page with no non-dev warnings
      continue
    }

    if (errors.length) {
      ampError(page, errors[0])
      for (let index = 1; index < errors.length; ++index) {
        ampError('', errors[index])
      }
    }
    if (warnings.length) {
      ampWarn(errors.length ? '' : page, warnings[0])
      for (let index = 1; index < warnings.length; ++index) {
        ampWarn('', warnings[index])
      }
    }
    messages.push(['', '', '', ''])
  }

  if (!messages.length) {
    return ''
  }

  output += textTable(messages, {
    align: ['l', 'l', 'l', 'l'],
    stringLength(str: string) {
      return stripAnsi(str).length
    },
  })

  return output
}

const buildStore = createStore<BuildStatusStore>()

buildStore.subscribe((state) => {
  const { amp, client, server } = state

  const [{ status }] = [
    { status: client, phase: getWebpackStatusPhase(client) },
    { status: server, phase: getWebpackStatusPhase(server) },
  ].sort((a, b) => a.phase.valueOf() - b.phase.valueOf())

  const { bootstrap: bootstrapping, appUrl } = consoleStore.getState()
  if (bootstrapping && status.loading) {
    return
  }

  let partialState: Partial<OutputState> = {
    bootstrap: false,
    appUrl: appUrl!,
  }

  if (status.loading) {
    consoleStore.setState(
      { ...partialState, loading: true } as OutputState,
      true
    )
  } else {
    let { errors, warnings } = status

    if (errors == null) {
      if (Object.keys(amp).length > 0) {
        warnings = (warnings || []).concat(formatAmpMessages(amp) || [])
        if (!warnings.length) warnings = null
      }
    }

    consoleStore.setState(
      {
        ...partialState,
        loading: false,
        typeChecking: false,
        errors,
        warnings,
      } as OutputState,
      true
    )
  }
})

export function ampValidation(
  page: string,
  errors: AmpStatus[],
  warnings: AmpStatus[]
) {
  const { amp } = buildStore.getState()
  if (!(errors.length || warnings.length)) {
    buildStore.setState({
      amp: Object.keys(amp)
        .filter((k) => k !== page)
        .sort()
        // eslint-disable-next-line no-sequences
        .reduce((a, c) => ((a[c] = amp[c]), a), {} as AmpPageStatus),
    })
    return
  }

  const newAmp: AmpPageStatus = { ...amp, [page]: { errors, warnings } }
  buildStore.setState({
    amp: Object.keys(newAmp)
      .sort()
      // eslint-disable-next-line no-sequences
      .reduce((a, c) => ((a[c] = newAmp[c]), a), {} as AmpPageStatus),
  })
}

export function watchCompilers(
  client: import('webpack').Compiler,
  server: import('webpack').Compiler
) {
  if (previousClient === client && previousServer === server) {
    return
  }

  buildStore.setState({
    client: { loading: true },
    server: { loading: true },
  })

  function tapCompiler(
    key: string,
    compiler: any,
    onEvent: (status: WebpackStatus) => void
  ) {
    compiler.hooks.invalid.tap(`NextJsInvalid-${key}`, () => {
      onEvent({ loading: true })
    })

    compiler.hooks.done.tap(
      `NextJsDone-${key}`,
      (stats: import('webpack').Stats) => {
        buildStore.setState({ amp: {} })

        const { errors, warnings } = formatWebpackMessages(
          stats.toJson({ all: false, warnings: true, errors: true })
        )

        const hasErrors = !!errors?.length
        const hasWarnings = !!warnings?.length

        onEvent({
          loading: false,
          errors: hasErrors ? errors : null,
          warnings: hasWarnings ? warnings : null,
        })
      }
    )
  }

  tapCompiler('client', client, (status) =>
    buildStore.setState({ client: status })
  )
  tapCompiler('server', server, (status) =>
    buildStore.setState({ server: status })
  )

  previousClient = client
  previousServer = server
}