import toml from '@tauri-apps/toml'
import chalk from 'chalk'
import { sync as spawn } from 'cross-spawn'
import fs from 'fs'
import os from 'os'
import path from 'path'
import { appDir, tauriDir } from '../helpers/app-paths'
import { TauriConfig } from './../types/config'

interface DirInfo {
  path: string
  name: string
  type?: 'folder' | 'file'
  children?: DirInfo[]
}

function dirTree(filename: string): DirInfo {
  const stats = fs.lstatSync(filename)
  const info: DirInfo = {
    path: filename,
    name: path.basename(filename)
  }

  if (stats.isDirectory()) {
    info.type = 'folder'
    info.children = fs.readdirSync(filename).map(function(child: string) {
      return dirTree(filename + '/' + child)
    })
  } else {
    info.type = 'file'
  }

  return info
}

function getVersion(
  command: string,
  args: string[] = [],
  formatter?: (output: string) => string
): string {
  try {
    const child = spawn(command, [...args, '--version'])
    if (child.status === 0) {
      const output = String(child.output[1])
      return chalk
        .green(formatter === undefined ? output : formatter(output))
        .replace('\n', '')
    }
    return chalk.red('Not installed')
  } catch (err) {
    return chalk.red('Not installed')
  }
}

interface Info {
  section?: boolean
  key: string
  value?: string
}

function printInfo(info: Info): void {
  console.log(
    `${info.section ? '\n' : ''}${info.key}${
      info.value === undefined ? '' : ' - ' + info.value
    }`
  )
}

function printAppInfo(tauriDir: string): void {
  printInfo({ key: 'App', section: true })

  try {
    const tomlPath = path.join(tauriDir, 'Cargo.toml')
    const tomlFile = fs.readFileSync(tomlPath)
    // @ts-ignore
    const tomlContents = toml.parse(tomlFile)

    const tauriVersion = (): string => {
      const tauri = tomlContents.dependencies.tauri
      if (tauri) {
        if (tauri.version) {
          return chalk.green(tauri.version)
        }
        if (tauri.path) {
          try {
            const tauriTomlPath = path.resolve(
              tauriDir,
              tauri.path,
              'Cargo.toml'
            )
            const tauriTomlFile = fs.readFileSync(tauriTomlPath)
            // @ts-ignore
            const tauriTomlContents = toml.parse(tauriTomlFile)
            return chalk.green(
              `${tauriTomlContents.package.version} (from source)`
            )
          } catch (_) {}
        }
      }
      return chalk.red('unknown')
    }

    printInfo({ key: '  tauri', value: tauriVersion() })
  } catch (_) {}

  try {
    const tauriMode = (config: TauriConfig): string => {
      if (config.tauri.embeddedServer) {
        return chalk.green(
          config.tauri.embeddedServer.active ? 'embedded-server' : 'no-server'
        )
      }
      return chalk.red('unset')
    }
    const configPath = path.join(tauriDir, 'tauri.conf.json')
    const config = __non_webpack_require__(configPath) as TauriConfig
    printInfo({ key: '  mode', value: tauriMode(config) })
    printInfo({
      key: '  build-type',
      value:
        config.tauri.bundle && config.tauri.bundle.active ? 'bundle' : 'build'
    })
    printInfo({
      key: '  CSP',
      value: config.tauri.security ? config.tauri.security.csp : 'unset'
    })
    printInfo({
      key: '  Windows',
      value: config.tauri.edge && config.tauri.edge.active ? 'Edge' : 'MSHTML'
    })
    printInfo({
      key: '  distDir',
      value: config.build
        ? chalk.green(config.build.distDir)
        : chalk.red('unset')
    })
    printInfo({
      key: '  devPath',
      value: config.build
        ? chalk.green(config.build.devPath)
        : chalk.red('unset')
    })
  } catch (_) {}
}

module.exports = () => {
  printInfo({
    key: 'Operating System',
    value: chalk.green(
      `${os.type()}(${os.release()}) - ${os.platform()}/${os.arch()}`
    ),
    section: true
  })
  printInfo({ key: 'Node.js environment', section: true })
  printInfo({ key: '  Node.js', value: chalk.green(process.version.slice(1)) })
  printInfo({
    key: '  tauri.js',
    value: chalk.green(require('../../package.json').version)
  })
  printInfo({ key: 'Rust environment', section: true })
  printInfo({
    key: '  rustc',
    value: getVersion('rustc', [], output => output.split(' ')[1])
  })
  printInfo({
    key: '  cargo',
    value: getVersion('cargo', [], output => output.split(' ')[1])
  })
  printInfo({ key: '  tauri-cli', value: getVersion('cargo', ['tauri-cli']) })
  printInfo({ key: 'Global packages', section: true })
  printInfo({ key: '  NPM', value: getVersion('npm') })
  printInfo({ key: '  yarn', value: getVersion('yarn') })
  printInfo({ key: 'App directory structure', section: true })

  const tree = dirTree(appDir)
  for (const artifact of tree.children || []) {
    if (artifact.type === 'folder') {
      console.log(`/${artifact.name}`)
    }
  }
  printAppInfo(tauriDir)
}