import { execFile } from 'child_process'
import * as path from 'path'
import * as fs from 'fs'
import readdir from 'fs-readdir-promise'
import sharp from 'sharp'

import modules from './modules'
import * as runner from './runner'

const MEGABYTES = 1024 * 1024
const MAX_TRANSFER_SIZE = 2.5 * MEGABYTES
const MAX_LOAD_SIZE = 108 * MEGABYTES
const THUMBNAIL_SIZE = 200
const THUMBNAIL_QUALITY = 80

function sanitize_path(f){
  return f.replace(/^\//,'').replace(/\.\./, '')
}

export function upload_file(task, cb) {
  const module = modules[task.module]
  const filepath = path.join(module.cwd, sanitize_path(task.path), sanitize_path(task.filename))
  const params = [
    '-F', 'module=' + task.module,
    '-F', 'activity=' + task.activity,
    '-F', 'generated=' + (String(task.generated) === 'true'),
    '-F', 'processed=' + (String(task.processed) === 'true'),
    '-F', "file=@" + filepath,
    process.env.API_REMOTE + '/api/folder/' + task.folder_id + '/upload/',
  ]
  console.log(params)
  execFile('curl', params, cb)
  // curl \
  // -F "module=samplernn" \
  // -F "activity=train" \
  // -F "file=@woods1.jpg" \
  // localhost:7013/api/folder/1/upload/
}

export function status () {
  return {
    cpu: serialize_task(state.current_cpu_task),
    gpu: serialize_task(state.current_gpu_task),
  }
}

export function run_system_command(opt, cb) {
  console.log('running system command:', opt.cmd)
  switch(opt.cmd) {
    case 'nvidia-smi':
    case 'uptime':
    case 'w':
      execFile(opt.cmd, [], cb)
      break
    case 'ps':
      execFile('ps', ['au'], cb)
      break
    case 'df':
      execFile('df', ['-h'], cb)
      break
    case 'ls':
      list_directory(opt, cb)
      break
    case 'du':
      disk_usage(opt, cb)
      break
    case 'list_sequences':
      list_sequences(opt, cb)
      break
    case 'dir_to_video':
      dir_to_video(opt, cb)
      break
    default:
      cb({ error: 'no such command' })
      break
  }
}

export function module_dir(opt, dir){
  if (!opt.module || ! modules[opt.module]) {
    return null
  }
  const module = modules[opt.module]
  if (!module) {
    return null
  }
  return path.join(module.cwd, dir.replace(/\.\.?\//g, ''))
}

export function read_file(opt, cb) {
  const fn = module_dir(opt, opt.fn)
  if (!fn) return cb([])
  stat_promise(fn).then(stat => {
    if (stat.size > MAX_TRANSFER_SIZE) {
      return cb({ error: 'file too large'})
    }
    fs.readFile(fn, (err, buf) => cb({
      error: err,
      name: opt.fn,
      path: fn,
      date: stat.ctime,
      size: stat.size,
      buf
    }))
  }).catch(() => cb({ error: 'error reading file' }))
}

export function thumbnail(opt, cb) {
  const fn = module_dir(opt, opt.fn)
  if (!fn) return cb([])
  stat_promise(fn).then(stat => {
    if (stat.size > MAX_LOAD_SIZE) {
      return cb({ error: 'file too large'})
    }
    sharp(fn)
      .resize(opt.size || THUMBNAIL_SIZE)
      .jpeg({ quality: opt.quality || THUMBNAIL_QUALITY })
      .toBuffer()
      .then(buf => cb({
        error: err,
        name: opt.fn,
        path: fn,
        date: stat.ctime,
        size: stat.size,
        buf
      }))
      .catch(err => cb({
        error: err,
        name: opt.fn,
        path: fn,
        date: stat.ctime,
        size: stat.size,
        buf: null,
      }))
  })
}

export function list_directory(opt, cb) {
  const dir = module_dir(opt, opt.dir)
  if (!dir) return cb([])
  fs.readdir(dir, (err, files) => {
    const statPromises = (files || []).filter(f => f[0] !== '.').map(f => {
      return new Promise((resolve, reject) => {
        const full_path = path.join(dir, f)
        fs.stat(full_path, (err, stat={}) => {
          resolve({
            name: f,
            date: stat.ctime,
            size: stat.size,
            dir: stat.isDirectory ? stat.isDirectory() : false,
          })
        })
      })
    })
    Promise.all(statPromises).then(stats => {
      cb(stats, dir)
    }).catch(error => {
      cb(error)
    })
  })
}

export function count_directory(opt, cb) {
  const dir = module_dir(opt, opt.dir)
  if (!dir) return cb([])
  fs.readdir(dir, (err, files) => {
    err ? cb(err) : cb(files.length)
  })
}

// list the contents of a directory of sequences
export function list_sequences(opt, cb) {
  list_directory(opt, (files, root_dir) => {
    // console.log(files, root_dir)
    const sequencePromises = files.filter(d => !!d.dir).map(f => {
      return list_sequence(opt, f, root_dir)
    })
    Promise.all(sequencePromises).then(cb).catch(error => {
      console.error(error)
      cb([])
    })
  })
}
export function list_sequence(opt, f, root_dir) {
  return new Promise( (resolve, reject) => {
    let sequence = {
      name: f.name,
      date: f.date,
      size: f.size,
      frame: null,
      count: 0,
    }
    readdir(path.join(root_dir, f.name)).then(files => {
      if (! files.length) {
        return resolve(sequence)
      }
      const middle_file = files[Math.floor(files.length/2)]
      if (! middle_file) return resolve(sequence)
      sequence.frame = {
        prefix: middle_file.split('_')[0],
      }
      sequence.count = files.length
      // console.log(sequence.count)
      return stat_promise(path.join(root_dir, f.name, middle_file))
    }).then(stat => {
      sequence.frame.date = stat.date
      sequence.frame.size = stat.size
      resolve(sequence)
    }).catch(err => reject(err))
  })
}

export function stat_promise(fn) {
  return new Promise((resolve, reject) => {
    fs.stat(fn, (err, stat={}) => {
      if (err) reject(err)
      resolve(stat)
    })
  })
}
export function dir_to_video(opt, db) {
  const dir = module_dir(opt, opt.dir)
  if (!dir) return cb([])
  // input: the path (in results/) you want as a video
  // output: the path (in renders/) that contains the video
  // run the dir to video script with CWD as the directory and first input as ../renders plus the directory name
  // list the file in renders...
  execFile('./bin/dir_to_video.pl', params, {
    cwd: module.cwd,
  }, cb)
}


export function disk_usage(opt, cb) {
  const dir = module_dir(opt, opt.dir)
  if (!dir) return cb([])
  execFile('du', ['-d', 1, dir], cb)
}

export function run_script(task, cb) {
  if (!task.module || ! modules[task.module]) {
    cb("")
  }
  const module = modules[task.module]
  const activity = module.activities[task.activity]
  const { interpreter, params, cancelled } = runner.build_params(module, activity, task)
  if (cancelled) return { type: 'error', error: "Task builder cancelled process" }
  if (! interpreter) return { type: 'error', error: "No such interpreter: " + activity.interpreter }
  if (! activity.isScript) return { type: 'error', error: "Not a script: " + task.module }

  console.log('running task', task.activity)
  console.log(module.cwd)
  console.log(interpreter.cmd, params)
  execFile(interpreter.cmd, params, {
    cwd: module.cwd,
  }, cb)
}