/* -*- indent-tabs-mode: nil; js-indent-level: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const kPermissionType = "translate";
const kLanguagesPref = "browser.translation.neverForLanguages";

function Tree(aId, aData) {
  this._data = aData;
  this._tree = document.getElementById(aId);
  this._tree.view = this;
}

Tree.prototype = {
  get tree() {
    return this._tree;
  },
  get isEmpty() {
    return !this._data.length;
  },
  get hasSelection() {
    return this.selection.count > 0;
  },
  getSelectedItems() {
    let result = [];

    let rc = this.selection.getRangeCount();
    for (let i = 0; i < rc; ++i) {
      let min = {},
        max = {};
      this.selection.getRangeAt(i, min, max);
      for (let j = min.value; j <= max.value; ++j) {
        result.push(this._data[j]);
      }
    }

    return result;
  },

  // nsITreeView implementation
  get rowCount() {
    return this._data.length;
  },
  getCellText(aRow, aColumn) {
    return this._data[aRow];
  },
  isSeparator(aIndex) {
    return false;
  },
  isSorted() {
    return false;
  },
  isContainer(aIndex) {
    return false;
  },
  setTree(aTree) {},
  getImageSrc(aRow, aColumn) {},
  getCellValue(aRow, aColumn) {},
  cycleHeader(column) {},
  getRowProperties(row) {
    return "";
  },
  getColumnProperties(column) {
    return "";
  },
  getCellProperties(row, column) {
    return "";
  },
  QueryInterface: ChromeUtils.generateQI(["nsITreeView"]),
};

function Lang(aCode, label) {
  this.langCode = aCode;
  this._label = label;
}

Lang.prototype = {
  toString() {
    return this._label;
  },
};

var gTranslationExceptions = {
  onLoad() {
    if (this._siteTree) {
      // Re-using an open dialog, clear the old observers.
      this.uninit();
    }

    // Load site permissions into an array.
    this._sites = [];
    for (let perm of Services.perms.all) {
      if (
        perm.type == kPermissionType &&
        perm.capability == Services.perms.DENY_ACTION
      ) {
        this._sites.push(perm.principal.origin);
      }
    }
    Services.obs.addObserver(this, "perm-changed");
    this._sites.sort();

    this._siteTree = new Tree("sitesTree", this._sites);
    this.onSiteSelected();

    this._langs = this.getLanguageExceptions();
    Services.prefs.addObserver(kLanguagesPref, this);
    this._langTree = new Tree("languagesTree", this._langs);
    this.onLanguageSelected();
  },

  // Get the list of languages we don't translate as an array.
  getLanguageExceptions() {
    let langs = Services.prefs.getCharPref(kLanguagesPref);
    if (!langs) {
      return [];
    }

    let langArr = langs.split(",");
    let displayNames = Services.intl.getLanguageDisplayNames(
      undefined,
      langArr
    );
    let result = langArr.map((lang, i) => new Lang(lang, displayNames[i]));
    result.sort();

    return result;
  },

  observe(aSubject, aTopic, aData) {
    if (aTopic == "perm-changed") {
      if (aData == "cleared") {
        if (!this._sites.length) {
          return;
        }
        let removed = this._sites.splice(0, this._sites.length);
        this._siteTree.tree.rowCountChanged(0, -removed.length);
      } else {
        let perm = aSubject.QueryInterface(Ci.nsIPermission);
        if (perm.type != kPermissionType) {
          return;
        }

        if (aData == "added") {
          if (perm.capability != Services.perms.DENY_ACTION) {
            return;
          }
          this._sites.push(perm.principal.origin);
          this._sites.sort();
          let tree = this._siteTree.tree;
          tree.rowCountChanged(0, 1);
          tree.invalidate();
        } else if (aData == "deleted") {
          let index = this._sites.indexOf(perm.principal.origin);
          if (index == -1) {
            return;
          }
          this._sites.splice(index, 1);
          this._siteTree.tree.rowCountChanged(index, -1);
          this.onSiteSelected();
          return;
        }
      }
      this.onSiteSelected();
    } else if (aTopic == "nsPref:changed") {
      this._langs = this.getLanguageExceptions();
      let change = this._langs.length - this._langTree.rowCount;
      this._langTree._data = this._langs;
      let tree = this._langTree.tree;
      if (change) {
        tree.rowCountChanged(0, change);
      }
      tree.invalidate();
      this.onLanguageSelected();
    }
  },

  _handleButtonDisabling(aTree, aIdPart) {
    let empty = aTree.isEmpty;
    document.getElementById("removeAll" + aIdPart + "s").disabled = empty;
    document.getElementById("remove" + aIdPart).disabled =
      empty || !aTree.hasSelection;
  },

  onLanguageSelected() {
    this._handleButtonDisabling(this._langTree, "Language");
  },

  onSiteSelected() {
    this._handleButtonDisabling(this._siteTree, "Site");
  },

  onLanguageDeleted() {
    let langs = Services.prefs.getCharPref(kLanguagesPref);
    if (!langs) {
      return;
    }

    let removed = this._langTree.getSelectedItems().map(l => l.langCode);

    langs = langs.split(",").filter(l => !removed.includes(l));
    Services.prefs.setCharPref(kLanguagesPref, langs.join(","));
  },

  onAllLanguagesDeleted() {
    Services.prefs.setCharPref(kLanguagesPref, "");
  },

  onSiteDeleted() {
    let removedSites = this._siteTree.getSelectedItems();
    for (let origin of removedSites) {
      let principal = Services.scriptSecurityManager.createContentPrincipalFromOrigin(
        origin
      );
      Services.perms.removeFromPrincipal(principal, kPermissionType);
    }
  },

  onAllSitesDeleted() {
    if (this._siteTree.isEmpty) {
      return;
    }

    let removedSites = this._sites.splice(0, this._sites.length);
    this._siteTree.tree.rowCountChanged(0, -removedSites.length);

    for (let origin of removedSites) {
      let principal = Services.scriptSecurityManager.createContentPrincipalFromOrigin(
        origin
      );
      Services.perms.removeFromPrincipal(principal, kPermissionType);
    }

    this.onSiteSelected();
  },

  onSiteKeyPress(aEvent) {
    if (aEvent.keyCode == KeyEvent.DOM_VK_DELETE) {
      this.onSiteDeleted();
    }
  },

  onLanguageKeyPress(aEvent) {
    if (aEvent.keyCode == KeyEvent.DOM_VK_DELETE) {
      this.onLanguageDeleted();
    }
  },

  uninit() {
    Services.obs.removeObserver(this, "perm-changed");
    Services.prefs.removeObserver(kLanguagesPref, this);
  },
};