import chalk from 'chalk'
import logger from 'loglevel'
import { copyFileSync, existsSync, writeFileSync } from 'node:fs'
import { basename, isAbsolute, join } from 'node:path'
import kebabCase from 'kebab-case'
import  { userInfo } from 'os'
import { ENTER, createFolderIfNotExists, failureDescription, validateName } from '../utils.js'
import { PROGRAM_FILE_EXTENSION, TEST_FILE_EXTENSION, WOLLOK_FILE_EXTENSION } from 'wollok-ts'
import { execSync } from 'node:child_process'

const { bold, cyan, yellow, green } = chalk

export type Options = {
  project: string,
  name?: string | undefined,
  noTest: boolean,
  noCI: boolean,
  game: boolean,
  noGit: boolean,
  natives?: string
}

export default function (folder: string | undefined, { project: _project, name, noTest = false, noCI = false, game = false, noGit = false, natives = undefined }: Options): void {
  try {
    const project = join(_project, folder ?? '')

    // Initialization
    if (existsSync(join(project, 'package.json'))) {
      throw new Error('There is already a project inside the specified folder')
    }
    logger.info(cyan(`Creating project in ${bold(project)}...`))

    const exampleName = name ?? 'example'
    validateName(basename(project))
    validateName(exampleName)

    // Creating folders
    createFolderIfNotExists(project)
    if (natives) {
      const nativesFolder = isAbsolute(natives) ? natives : join(project, natives)
      createFolderIfNotExists(nativesFolder)
    }
    createFolderIfNotExists(join(project, '.github'))
    createFolderIfNotExists(join(project, '.github', 'workflows'))
    if (game) {
      logger.info('Creating assets folder with pepita.png')
      const assetsFolder = join(project, 'assets')
      createFolderIfNotExists(assetsFolder)
      const image = join('public', 'game', 'pepita.png')
      copyFileSync(image, join(assetsFolder, 'pepita.png'))
    }

    // Creating files
    const definition = game ? wlkDefinitionGame : wlkDefinition
    logger.info(`Creating definition file ${exampleName}.${WOLLOK_FILE_EXTENSION}`)
    writeFileSync(join(project, `${exampleName}.${WOLLOK_FILE_EXTENSION}`), definition)

    if (!noTest) {
      const definition = game ? testDefinitionGame(exampleName) : testDefinition(exampleName)
      const testFile = `test${capitalizeFirstLetter(exampleName)}.${TEST_FILE_EXTENSION}`
      logger.info(`Creating test file ${testFile}`)
      writeFileSync(join(project, testFile), definition)
    }

    if (game) {
      const gameFile = `main${capitalizeFirstLetter(exampleName)}.${PROGRAM_FILE_EXTENSION}`
      logger.info(`Creating program file ${gameFile}`)
      writeFileSync(join(project, `${gameFile}`), gameDefinition(exampleName))
    }

    logger.info('Creating package.json')
    writeFileSync(join(project, 'package.json'), packageJsonDefinition(project, game, natives ))

    if (!noCI) {
      logger.info('Creating CI files')
      writeFileSync(join(project, '.github', 'workflows', 'ci.yml'), ymlForCI)
    }

    logger.info('Creating README')
    writeFileSync(join(project, 'README.md'), readme(exampleName))

    logger.info('Creating Gitignore')
    writeFileSync(join(project, '.gitignore'), gitignore)

    if (!noGit) {
      logger.info('Initializing Git repository')
      try {
        execSync('git init --initial-branch=master', { cwd: project })
      } catch {
        logger.error(yellow('🚨 Error initializing git repository, please check if git is installed in your system.'))
      }
    }

    // Finish
    logger.info(green('✨ Project succesfully created. Happy coding!'))
    process.exit(0)
  } catch (error) {
    logger.error(failureDescription((error as unknown as Error).message))
    process.exit(1)
  }
}


// ══════════════════════════════════════════════════════════════════════════════════════════════════════════════════
// HELPER FUNCTIONS
// ══════════════════════════════════════════════════════════════════════════════════════════════════════════════════

const capitalizeFirstLetter = (value: string) =>
  value.charAt(0).toUpperCase() + value.slice(1)

// ══════════════════════════════════════════════════════════════════════════════════════════════════════════════════
// COMMANDS
// ══════════════════════════════════════════════════════════════════════════════════════════════════════════════════


// files made by default

const wlkDefinition = `object pepita {
  var energy = 100

  method energy() = energy

  method fly(minutes) {
    energy = energy - minutes * 3
  }
}`

const testDefinition = (exampleName: string) => `import ${exampleName}.pepita

describe "group of tests for pepita" {

  test "pepita has initial energy" {
    assert.equals(100, pepita.energy())
  }

}`


// files made for games

const wlkDefinitionGame = `object pepita {
  var energy = 100
  var property position = game.origin()

  method energy() = energy

  method image() = "pepita.png"

  method fly(minutes) {
    energy = energy - minutes * 3
  }
}`

const testDefinitionGame = (exampleName: string) => `import wollok.game.*
import ${exampleName}.pepita

describe "group of tests for pepita" {
  test "pepita has initial energy" {
    assert.equals(100, pepita.energy())
  }

  test "pepita has an image" {
    assert.equals("pepita.png", pepita.image())
  }

}`


const gameDefinition = (exampleName: string) => `import wollok.game.*
import ${exampleName}.pepita

program PepitaGame {
	game.title("Pepita")
	game.height(10)
	game.width(10)

	game.addVisualCharacter(pepita)

	game.start()
}
`


const packageJsonDefinition = (projectName: string, game: boolean, natives?: string) => {
  const wollokVersion = '4.2.3' // TODO: obtain it from package.json dependency

  return `{
    "name": "${kebabCase(basename(projectName))}",
    "version": "1.0.0",
    ${game ? assetsConfiguration() : ''}"wollokVersion": "${wollokVersion}",
    "author": "${userInfo().username}",${nativesConfiguration(natives)}
    "license": "ISC"
  }
  `
}

const assetsConfiguration = () => `"resourceFolder": "assets",${ENTER}  `
const nativesConfiguration = (natives?: string) =>  natives ? `${ENTER}  "natives": "${natives}",` : ''

const ymlForCI = `name: build

on: [push, pull_request]
jobs:
  wollok-ts:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repo
        uses: actions/checkout@v4

      - name: Setup Node.js 20
        uses: actions/setup-node@v4
        with:
          node-version: 20

      - name: Install wollok-ts-cli globally
        run: npm install -g wollok-ts-cli

      - run: wollok test --skipValidations -p ./
        name: Run tests
`

const readme = (exampleName: string) => `

## ${exampleName}

TODO

`

const gitignore = `
# Local history
.history

# Wollok Log
log
*.log

# Dependencies
node_modules
`