// LICENSE : MIT
"use strict";
import { JSerWeek } from "../models/JSerWeek";
import { JSerItem } from "../models/JSerItem";

/**
 * {タグ名:出現回数}のオブジェクトを返す
 * @param {JSerWeek[]} weeks
 * @returns {{string:number}}
 */
export function countTagsByGroup(weeks: JSerWeek[]): { [index: string]: number } {
    return countByGroup(weeks, function(item: JSerItem) {
        var rank: any = {};
        item.tags.forEach(function(tag) {
            rank[tag] = ++rank[tag] || 1;
        });
        return rank;
    });
}

export function countByGroup(weeks: JSerWeek[], countFn: any): { [index: string]: number } {
    var rank: any = {};
    weeks.forEach(function(week) {
        week.items.forEach(function(item) {
            var ret = countFn(item);
            var keys: string[] = Object.keys(ret);
            keys.forEach(function(key) {
                rank[key] = (rank[key] || 0) + ret[key];
            });
        });
    });
    return rank;
}