NEWSBLUR.Models.Story = Backbone.Model.extend({
    
    score: function() {
        if (NEWSBLUR.reader.active_feed == 'starred') {
            return 1;
        } else {
            return NEWSBLUR.utils.compute_story_score(this);
        }
    },
    
    score_name: function(score) {
        score = !_.isUndefined(score) ? score : this.score();
        var score_name = 'neutral';
        if (score > 0) score_name = 'positive';
        if (score < 0) score_name = 'negative';
        return score_name;
    },
    
    has_modifications: function() {
        if (this.get('story_content').indexOf('<ins') != -1) {
            return true;
        } else if (NEWSBLUR.assets.preference('hide_story_changes') && 
                   this.get('story_content').indexOf('<del') != -1) {
            return true;
        }
        return false;
    }
    
});

NEWSBLUR.Collections.Stories = Backbone.Collection.extend({
    
    model: NEWSBLUR.Models.Story,
   
    read_stories: [],
    
    active_story: null,
    
    initialize: function() {
        this.bind('change:selected', this.detect_selected_story);
    },
    
    // ===========
    // = Actions =
    // ===========
    
    deselect: function(selected_story) {
        this.any(function(story) {
            if (story.get('selected') && story != selected_story) {
                story.set('selected', false);
                return true;
            }
        });
    },
    
    mark_read: function(story, options) {
        options = options || {};
        var delay = NEWSBLUR.assets.preference('read_story_delay');

        if (options.skip_delay) {
            delay = 0;
        } else if (delay == -1) {
            return;
        }

        this.last_read_story_id = story.id;
        clearTimeout(this.read_story_delay);
        
        this.read_story_delay = _.delay(_.bind(function() {
            if (delay || this.last_read_story_id == story.id || delay == 0) {
                var mark_read_fn = NEWSBLUR.assets.mark_story_as_read;
                var feed = NEWSBLUR.assets.get_feed(story.get('story_feed_id'));
                if (feed.is_social()) {
                    mark_read_fn = NEWSBLUR.assets.mark_social_story_as_read;
                }
                mark_read_fn.call(NEWSBLUR.assets, story.id, story.get('story_feed_id'), function(read) {
                    NEWSBLUR.reader.update_read_count(story.id, story.get('story_feed_id'), {previously_read: read});
                });
                story.set('read_status', 1);
            }
        }, this), delay * 1000);
    },
    
    mark_unread: function(story, options) {
        options = options || {};
        NEWSBLUR.assets.mark_story_as_unread(story.id, story.get('story_feed_id'), function(read) {
            NEWSBLUR.reader.update_read_count(story.id, story.get('story_feed_id'), {unread: true});
        });
        story.set('read_status', 0);
    },
    
    // ==================
    // = Model Managers =
    // ==================
    
    visible: function() {
        var unread_score = NEWSBLUR.assets.preference('unread_view');
        
        return this.select(function(story) {
            return story.score() >= unread_score;
        });
    },
    
    hidden: function() {
        var unread_score = NEWSBLUR.assets.preference('unread_view');
        
        return this.select(function(story) {
            return story.score() < unread_view;
        });
    },
    
    // ===========
    // = Getters =
    // ===========
    
    get_next_story: function(direction) {
        if (direction == -1) return this.get_previous_story();
        
        var visible_stories = this.visible();

        if (!this.active_story) {
            return visible_stories[0];
        }

        var current_index = _.indexOf(visible_stories, this.active_story);

        if (current_index+1 <= visible_stories.length) {
            return visible_stories[current_index+1];
        }
    },
    
    get_previous_story: function() {
        var visible_stories = this.visible();

        if (!this.active_story) {
            return visible_stories[0];
        }

        var current_index = _.indexOf(visible_stories, this.active_story);

        if (current_index-1 >= 0) {
            return visible_stories[current_index-1];
        }
    },
    
    // ==========
    // = Events =
    // ==========
    
    detect_selected_story: function(selected_story) {
        if (selected_story.get('selected')) {
            this.deselect(selected_story);
            this.active_story = selected_story;
            NEWSBLUR.reader.active_story = selected_story;
            if (!selected_story.get('read_status')) {
                this.mark_read(selected_story);
            }
        }
    }
    
});