import * as fs from 'fs-extra'
import * as path from 'path'
import { replaceExt, ensureUserPath, ensureDir } from './Utils'
import { Config } from './Config'
import { Plugin } from './FuseBox'

export class SparkyFile {
  public homePath: string

  public name: string

  public contents: Buffer | string

  public extension: string

  public filepath: string

  public root: string

  private savingRequired = false

  constructor(filepath: string, root: string) {
    this.filepath = path.normalize(filepath)
    this.root = path.normalize(root)

    const hp = path.relative(this.root, this.filepath)
    this.homePath = path.isAbsolute(hp) ? hp.slice(1) : hp
    this.name = path.basename(this.filepath)
  }

  public read(): SparkyFile {
    this.contents = fs.readFileSync(this.filepath)
    return this
  }

  public write(contents: string | Buffer): SparkyFile {
    this.contents = contents
    fs.writeFileSync(this.filepath, contents)
    return this
  }

  public save(): SparkyFile {
    this.savingRequired = false
    if (this.contents) {
      const { contents } = this
      if (typeof this.contents === 'object') {
        this.contents = JSON.stringify(contents, null, 2)
      }
      ensureDir(path.dirname(this.filepath))
      fs.writeFileSync(this.filepath, this.contents)
    }
    return this
  }

  public ext(ext: string): SparkyFile {
    this.extension = ext
    return this
  }

  public json(fn: any): SparkyFile {
    if (!this.contents) {
      this.read()
    }
    if (typeof fn === 'function') {
      try {
        const contents = this.contents.toString()
          ? JSON.parse(this.contents.toString())
          : {}
        const response = fn(contents)
        this.contents = response || contents
        this.savingRequired = true
      } catch (ex) {
        console.error(`SparkyFile Error parsing ${this.filepath} ${ex.message}`)
        process.exit(1)
      }
    }
    return this
  }

  public plugin(plugin: Plugin) {
    if (!this.contents) {
      this.read()
    }
  }

  public setContent(cnt: string): SparkyFile {
    this.contents = cnt
    this.savingRequired = true
    return this
  }

  public rename(name: string): SparkyFile {
    this.name = name
    return this
  }

  public copy(dest: string) {
    return new Promise((resolve, reject) => {
      const isDirectory = fs.statSync(this.filepath).isDirectory()
      if (isDirectory) {
        resolve()
        return
      }
      const isTemplate = dest.indexOf('$') > -1
      if (isTemplate) {
        if (!path.isAbsolute(dest)) {
          dest = path.join(Config.PROJECT_ROOT, dest)
        }
        dest = dest.replace('$name', this.name).replace('$path', this.filepath)
      } else {
        dest = path.join(dest, this.homePath)
        dest = ensureUserPath(dest)
      }
      if (this.extension) {
        dest = replaceExt(dest, `.${this.extension}`)
        delete this.extension
      }
      fs.copy(this.filepath, dest, err => {
        if (err) {
          reject(err)
          return
        }
        this.filepath = dest
        // save is required
        if (this.savingRequired) {
          this.save()
        }
        resolve()
      })
    })
  }
}