const { appPackageFolder, appsFolder } = require("../createAppPackage")
const {
  readJSON,
  writeJSON,
  readdir,
  stat,
  ensureDir,
  rename,
  unlink,
  rmdir,
} = require("fs-extra")
const { join, dirname } = require("path")
const { $ } = require("@budibase/core").common
const { keyBy, intersection, map } = require("lodash/fp")
const { merge } = require("lodash")

const { componentLibraryInfo } = require("./componentLibraryInfo")
const savePackage = require("./savePackage")
const buildApp = require("./buildApp")

module.exports.savePackage = savePackage

const getPages = async appPath => await readJSON(`${appPath}/pages.json`)
const getAppDefinition = async appPath =>
  await readJSON(`${appPath}/appDefinition.json`)

module.exports.getPackageForBuilder = async (config, appname) => {
  const appPath = appPackageFolder(config, appname)

  const pages = await getPages(appPath)

  return {
    appDefinition: await getAppDefinition(appPath),

    accessLevels: await readJSON(`${appPath}/access_levels.json`),

    pages,

    components: await getComponents(appPath, pages),

    screens: keyBy("name")(await fetchscreens(appPath)),
  }
}

module.exports.getApps = async (config, master) => {
  const dirs = await readdir(appsFolder(config))

  return $(master.listApplications(), [map(a => a.name), intersection(dirs)])
}

const componentPath = (appPath, name) =>
  join(appPath, "components", name + ".json")

module.exports.saveScreen = async (config, appname, component) => {
  const appPath = appPackageFolder(config, appname)
  const compPath = componentPath(appPath, component.name)
  await ensureDir(dirname(compPath))
  await writeJSON(compPath, component, {
    encoding: "utf8",
    flag: "w",
    spaces: 2,
  })
}

module.exports.renameScreen = async (config, appname, oldName, newName) => {
  const appPath = appPackageFolder(config, appname)

  const oldComponentPath = componentPath(appPath, oldName)

  const newComponentPath = componentPath(appPath, newName)

  await ensureDir(dirname(newComponentPath))
  await rename(oldComponentPath, newComponentPath)
}

module.exports.deleteScreen = async (config, appname, name) => {
  const appPath = appPackageFolder(config, appname)
  const componentFile = componentPath(appPath, name)
  await unlink(componentFile)

  const dir = dirname(componentFile)
  if ((await readdir(dir)).length === 0) {
    await rmdir(dir)
  }
}

module.exports.componentLibraryInfo = async (config, appname, lib) => {
  const appPath = appPackageFolder(config, appname)
  return await componentLibraryInfo(appPath, lib)
}

const getComponents = async (appPath, pages, lib) => {
  let libs
  if (!lib) {
    pages = pages || (await readJSON(`${appPath}/pages.json`))

    if (!pages.componentLibraries) return []

    libs = pages.componentLibraries
  } else {
    libs = [lib]
  }

  const components = {}
  const generators = {}

  for (let l of libs) {
    const info = await componentLibraryInfo(appPath, l)
    merge(components, info.components)
    merge(generators, info.generators)
  }

  if (components._lib) delete components._lib
  if (components._generators) delete components._generators

  return { components, generators }
}

const fetchscreens = async (appPath, relativePath = "") => {
  const currentDir = join(appPath, "components", relativePath)

  const contents = await readdir(currentDir)

  const components = []

  for (let item of contents) {
    const itemRelativePath = join(relativePath, item)
    const itemFullPath = join(currentDir, item)
    const stats = await stat(itemFullPath)

    if (stats.isFile()) {
      if (!item.endsWith(".json")) continue

      const component = await readJSON(itemFullPath)

      component.name = itemRelativePath
        .substring(0, itemRelativePath.length - 5)
        .replace(/\\/g, "/")

      component.props = component.props || {}

      components.push(component)
    } else {
      const childComponents = await fetchscreens(
        appPath,
        join(relativePath, item)
      )

      for (let c of childComponents) {
        components.push(c)
      }
    }
  }

  return components
}

module.exports.getComponents = getComponents