/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set sts=2 sw=2 et tw=80: */
"use strict";

// The ext-* files are imported into the same scopes.
/* import-globals-from ext-browserAction.js */

XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
                                  "resource://gre/modules/PlacesUtils.jsm");

const {
  TYPE_BOOKMARK,
  TYPE_FOLDER,
  TYPE_SEPARATOR,
} = PlacesUtils.bookmarks;

const BOOKMARKS_TYPES_TO_API_TYPES_MAP = new Map([
  [TYPE_BOOKMARK, "bookmark"],
  [TYPE_FOLDER, "folder"],
  [TYPE_SEPARATOR, "separator"],
]);

const BOOKMARK_SEPERATOR_URL = "data:";

XPCOMUtils.defineLazyGetter(this, "API_TYPES_TO_BOOKMARKS_TYPES_MAP", () => {
  let theMap = new Map();

  for (let [code, name] of BOOKMARKS_TYPES_TO_API_TYPES_MAP) {
    theMap.set(name, code);
  }
  return theMap;
});

let listenerCount = 0;

function getUrl(type, url) {
  switch (type) {
    case TYPE_BOOKMARK:
      return url;
    case TYPE_SEPARATOR:
      return BOOKMARK_SEPERATOR_URL;
    default:
      return undefined;
  }
}

const getTree = (rootGuid, onlyChildren) => {
  function convert(node, parent) {
    let treenode = {
      id: node.guid,
      title: node.title || "",
      index: node.index,
      dateAdded: node.dateAdded / 1000,
      type: BOOKMARKS_TYPES_TO_API_TYPES_MAP.get(node.typeCode),
      url: getUrl(node.typeCode, node.uri),
    };

    if (parent && node.guid != PlacesUtils.bookmarks.rootGuid) {
      treenode.parentId = parent.guid;
    }

    if (node.typeCode == TYPE_FOLDER) {
      treenode.dateGroupModified = node.lastModified / 1000;

      if (!onlyChildren) {
        treenode.children = node.children
          ? node.children.map(child => convert(child, node))
          : [];
      }
    }

    return treenode;
  }

  return PlacesUtils.promiseBookmarksTree(rootGuid, {
    excludeItemsCallback: item => {
      return item.annos &&
             item.annos.find(a => a.name == PlacesUtils.EXCLUDE_FROM_BACKUP_ANNO);
    },
  }).then(root => {
    if (onlyChildren) {
      let children = root.children || [];
      return children.map(child => convert(child, root));
    }
    let treenode = convert(root, null);
    treenode.parentId = root.parentGuid;
    // It seems like the array always just contains the root node.
    return [treenode];
  }).catch(e => Promise.reject({message: e.message}));
};

const convertBookmarks = result => {
  let node = {
    id: result.guid,
    title: result.title || "",
    index: result.index,
    dateAdded: result.dateAdded.getTime(),
    type: BOOKMARKS_TYPES_TO_API_TYPES_MAP.get(result.type),
    url: getUrl(result.type, result.url && result.url.href),
  };

  if (result.guid != PlacesUtils.bookmarks.rootGuid) {
    node.parentId = result.parentGuid;
  }

  if (result.type == TYPE_FOLDER) {
    node.dateGroupModified = result.lastModified.getTime();
  }

  return node;
};

let observer = new class extends EventEmitter {
  constructor() {
    super();

    this.skipTags = true;
    this.skipDescendantsOnItemRemoval = true;
  }

  onBeginUpdateBatch() {}
  onEndUpdateBatch() {}

  onItemAdded(id, parentId, index, itemType, uri, title, dateAdded, guid, parentGuid, source) {
    let bookmark = {
      id: guid,
      parentId: parentGuid,
      index,
      title,
      dateAdded: dateAdded / 1000,
      type: BOOKMARKS_TYPES_TO_API_TYPES_MAP.get(itemType),
      url: getUrl(itemType, uri && uri.spec),
    };

    if (itemType == TYPE_FOLDER) {
      bookmark.dateGroupModified = bookmark.dateAdded;
    }

    this.emit("created", bookmark);
  }

  onItemVisited() {}

  onItemMoved(id, oldParentId, oldIndex, newParentId, newIndex, itemType, guid, oldParentGuid, newParentGuid, source) {
    let info = {
      parentId: newParentGuid,
      index: newIndex,
      oldParentId: oldParentGuid,
      oldIndex,
    };
    this.emit("moved", {guid, info});
  }

  onItemRemoved(id, parentId, index, itemType, uri, guid, parentGuid, source) {
    let node = {
      id: guid,
      parentId: parentGuid,
      index,
      type: BOOKMARKS_TYPES_TO_API_TYPES_MAP.get(itemType),
      url: getUrl(itemType, uri && uri.spec),
    };

    this.emit("removed", {guid, info: {parentId: parentGuid, index, node}});
  }

  onItemChanged(id, prop, isAnno, val, lastMod, itemType, parentId, guid, parentGuid, oldVal, source) {
    let info = {};
    if (prop == "title") {
      info.title = val;
    } else if (prop == "uri") {
      info.url = val;
    } else {
      // Not defined yet.
      return;
    }

    this.emit("changed", {guid, info});
  }
}();

const decrementListeners = () => {
  listenerCount -= 1;
  if (!listenerCount) {
    PlacesUtils.bookmarks.removeObserver(observer);
  }
};

const incrementListeners = () => {
  listenerCount++;
  if (listenerCount == 1) {
    PlacesUtils.bookmarks.addObserver(observer);
  }
};

this.bookmarks = class extends ExtensionAPI {
  getAPI(context) {
    return {
      bookmarks: {
        async get(idOrIdList) {
          let list = Array.isArray(idOrIdList) ? idOrIdList : [idOrIdList];

          try {
            let bookmarks = [];
            for (let id of list) {
              let bookmark = await PlacesUtils.bookmarks.fetch({guid: id});
              if (!bookmark) {
                throw new Error("Bookmark not found");
              }
              bookmarks.push(convertBookmarks(bookmark));
            }
            return bookmarks;
          } catch (error) {
            return Promise.reject({message: error.message});
          }
        },

        getChildren: function(id) {
          // TODO: We should optimize this.
          return getTree(id, true);
        },

        getTree: function() {
          return getTree(PlacesUtils.bookmarks.rootGuid, false);
        },

        getSubTree: function(id) {
          return getTree(id, false);
        },

        search: function(query) {
          return PlacesUtils.bookmarks.search(query).then(result => result.map(convertBookmarks));
        },

        getRecent: function(numberOfItems) {
          return PlacesUtils.bookmarks.getRecent(numberOfItems).then(result => result.map(convertBookmarks));
        },

        create: function(bookmark) {
          let info = {
            title: bookmark.title || "",
          };

          info.type = API_TYPES_TO_BOOKMARKS_TYPES_MAP.get(bookmark.type);
          if (!info.type) {
            // If url is NULL or missing, it will be a folder.
            if (bookmark.url !== null) {
              info.type = TYPE_BOOKMARK;
            } else {
              info.type = TYPE_FOLDER;
            }
          }

          if (info.type === TYPE_BOOKMARK) {
            info.url = bookmark.url || "";
          }

          if (bookmark.index !== null) {
            info.index = bookmark.index;
          }

          if (bookmark.parentId !== null) {
            info.parentGuid = bookmark.parentId;
          } else {
            info.parentGuid = PlacesUtils.bookmarks.unfiledGuid;
          }

          try {
            return PlacesUtils.bookmarks.insert(info).then(convertBookmarks)
              .catch(error => Promise.reject({message: error.message}));
          } catch (e) {
            return Promise.reject({message: `Invalid bookmark: ${JSON.stringify(info)}`});
          }
        },

        move: function(id, destination) {
          let info = {
            guid: id,
          };

          if (destination.parentId !== null) {
            info.parentGuid = destination.parentId;
          }
          info.index = (destination.index === null) ?
            PlacesUtils.bookmarks.DEFAULT_INDEX : destination.index;

          try {
            return PlacesUtils.bookmarks.update(info).then(convertBookmarks)
              .catch(error => Promise.reject({message: error.message}));
          } catch (e) {
            return Promise.reject({message: `Invalid bookmark: ${JSON.stringify(info)}`});
          }
        },

        update: function(id, changes) {
          let info = {
            guid: id,
          };

          if (changes.title !== null) {
            info.title = changes.title;
          }
          if (changes.url !== null) {
            info.url = changes.url;
          }

          try {
            return PlacesUtils.bookmarks.update(info).then(convertBookmarks)
              .catch(error => Promise.reject({message: error.message}));
          } catch (e) {
            return Promise.reject({message: `Invalid bookmark: ${JSON.stringify(info)}`});
          }
        },

        remove: function(id) {
          let info = {
            guid: id,
          };

          // The API doesn't give you the old bookmark at the moment
          try {
            return PlacesUtils.bookmarks.remove(info, {preventRemovalOfNonEmptyFolders: true}).then(result => {})
              .catch(error => Promise.reject({message: error.message}));
          } catch (e) {
            return Promise.reject({message: `Invalid bookmark: ${JSON.stringify(info)}`});
          }
        },

        removeTree: function(id) {
          let info = {
            guid: id,
          };

          try {
            return PlacesUtils.bookmarks.remove(info).then(result => {})
              .catch(error => Promise.reject({message: error.message}));
          } catch (e) {
            return Promise.reject({message: `Invalid bookmark: ${JSON.stringify(info)}`});
          }
        },

        onCreated: new EventManager(context, "bookmarks.onCreated", fire => {
          let listener = (event, bookmark) => {
            fire.sync(bookmark.id, bookmark);
          };

          observer.on("created", listener);
          incrementListeners();
          return () => {
            observer.off("created", listener);
            decrementListeners();
          };
        }).api(),

        onRemoved: new EventManager(context, "bookmarks.onRemoved", fire => {
          let listener = (event, data) => {
            fire.sync(data.guid, data.info);
          };

          observer.on("removed", listener);
          incrementListeners();
          return () => {
            observer.off("removed", listener);
            decrementListeners();
          };
        }).api(),

        onChanged: new EventManager(context, "bookmarks.onChanged", fire => {
          let listener = (event, data) => {
            fire.sync(data.guid, data.info);
          };

          observer.on("changed", listener);
          incrementListeners();
          return () => {
            observer.off("changed", listener);
            decrementListeners();
          };
        }).api(),

        onMoved: new EventManager(context, "bookmarks.onMoved", fire => {
          let listener = (event, data) => {
            fire.sync(data.guid, data.info);
          };

          observer.on("moved", listener);
          incrementListeners();
          return () => {
            observer.off("moved", listener);
            decrementListeners();
          };
        }).api(),
      },
    };
  }
};
