'use strict'

const BinaryXmlParser = require('./binaryxml')

// const NS_ANDROID = 'http://schemas.android.com/apk/res/android'
const INTENT_MAIN = 'android.intent.action.MAIN'
const CATEGORY_LAUNCHER = 'android.intent.category.LAUNCHER'

class ManifestParser {
  constructor(buffer, options = {}) {
    this.buffer = buffer
    this.xmlParser = new BinaryXmlParser(this.buffer, options)
  }

  collapseAttributes(element) {
    const collapsed = Object.create(null)
    for (let attr of Array.from(element.attributes)) {
      collapsed[attr.name] = attr.typedValue.value
    }
    return collapsed
  }

  parseIntents(element, target) {
    target.intentFilters = []
    target.metaData = []

    return element.childNodes.forEach(element => {
      switch (element.nodeName) {
      case 'intent-filter': {
        const intentFilter = this.collapseAttributes(element)

        intentFilter.actions = []
        intentFilter.categories = []
        intentFilter.data = []

        element.childNodes.forEach(element => {
          switch (element.nodeName) {
          case 'action':
            intentFilter.actions.push(this.collapseAttributes(element))
            break
          case 'category':
            intentFilter.categories.push(this.collapseAttributes(element))
            break
          case 'data':
            intentFilter.data.push(this.collapseAttributes(element))
            break
          }
        })

        target.intentFilters.push(intentFilter)
        break
      }
      case 'meta-data':
        target.metaData.push(this.collapseAttributes(element))
        break
      }
    })
  }

  parseApplication(element) {
    const app = this.collapseAttributes(element)

    app.activities = []
    app.activityAliases = []
    app.launcherActivities = []
    app.services = []
    app.receivers = []
    app.providers = []
    app.usesLibraries = []

    element.childNodes.forEach(element => {
      switch (element.nodeName) {
      case 'activity': {
        const activity = this.collapseAttributes(element)
        this.parseIntents(element, activity)
        app.activities.push(activity)
        if (this.isLauncherActivity(activity)) {
          app.launcherActivities.push(activity)
        }
        break
      }
      case 'activity-alias': {
        const activityAlias = this.collapseAttributes(element)
        this.parseIntents(element, activityAlias)
        app.activityAliases.push(activityAlias)
        if (this.isLauncherActivity(activityAlias)) {
          app.launcherActivities.push(activityAlias)
        }
        break
      }
      case 'service': {
        const service = this.collapseAttributes(element)
        this.parseIntents(element, service)
        app.services.push(service)
        break
      }
      case 'receiver': {
        const receiver = this.collapseAttributes(element)
        this.parseIntents(element, receiver)
        app.receivers.push(receiver)
        break
      }
      case 'provider': {
        const provider = this.collapseAttributes(element)

        provider.grantUriPermissions = []
        provider.metaData = []
        provider.pathPermissions = []

        element.childNodes.forEach(element => {
          switch (element.nodeName) {
          case 'grant-uri-permission':
            provider.grantUriPermissions.push(this.collapseAttributes(element))
            break
          case 'meta-data':
            provider.metaData.push(this.collapseAttributes(element))
            break
          case 'path-permission':
            provider.pathPermissions.push(this.collapseAttributes(element))
            break
          }
        })

        app.providers.push(provider)
        break
      }
      case 'uses-library':
        app.usesLibraries.push(this.collapseAttributes(element))
        break
      }
    })

    return app
  }

  isLauncherActivity(activity) {
    return activity.intentFilters.some(function(filter) {
      const hasMain = filter.actions.some(action => action.name === INTENT_MAIN)
      if (!hasMain) {
        return false
      }
      return filter.categories.some(category => category.name === CATEGORY_LAUNCHER)
    })
  }

  parse() {
    const document = this.xmlParser.parse()
    const manifest = this.collapseAttributes(document)

    manifest.usesPermissions = []
    manifest.permissions = []
    manifest.permissionTrees = []
    manifest.permissionGroups = []
    manifest.instrumentation = null
    manifest.usesSdk = null
    manifest.usesConfiguration = null
    manifest.usesFeatures = []
    manifest.supportsScreens = null
    manifest.compatibleScreens = []
    manifest.supportsGlTextures = []
    manifest.application = Object.create(null)

    document.childNodes.forEach(element => {
      switch (element.nodeName) {
      case 'uses-permission':
        manifest.usesPermissions.push(this.collapseAttributes(element))
        break
      case 'permission':
        manifest.permissions.push(this.collapseAttributes(element))
        break
      case 'permission-tree':
        manifest.permissionTrees.push(this.collapseAttributes(element))
        break
      case 'permission-group':
        manifest.permissionGroups.push(this.collapseAttributes(element))
        break
      case 'instrumentation':
        manifest.instrumentation = this.collapseAttributes(element)
        break
      case 'uses-sdk':
        manifest.usesSdk = this.collapseAttributes(element)
        break
      case 'uses-configuration':
        manifest.usesConfiguration = this.collapseAttributes(element)
        break
      case 'uses-feature':
        manifest.usesFeatures.push(this.collapseAttributes(element))
        break
      case 'supports-screens':
        manifest.supportsScreens = this.collapseAttributes(element)
        break
      case 'compatible-screens':
        element.childNodes.forEach(screen => {
          return manifest.compatibleScreens.push(this.collapseAttributes(screen))
        })
        break
      case 'supports-gl-texture':
        manifest.supportsGlTextures.push(this.collapseAttributes(element))
        break
      case 'application':
      case 'com.stub.StubApp': // 360 encryption services (adbkit-apkreader#13)
        manifest.application = this.parseApplication(element)
        break
      }
    })

    return manifest
  }
}

module.exports = ManifestParser