// ==UserScript==
// @name         ExUserTagStat
// @namespace    http://nat.moe/
// @version      0.1
// @description  Stat visited exhentai tags.
// @author       nat <nat@nat.moe>
// @match        https://exhentai.org/g/*/*/
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    var ehus = {};

    if (localStorage.eh_usertagstat) {
        try {
          ehus = JSON.parse(localStorage.eh_usertagstat);
        } catch (e) {
          console.log('[eh-uts] db error', e);
          ehus = {};
        }
    }

    if (!ehus.visited) ehus.visited = [];
    if (!ehus.tags) ehus.tags = {};

    var viewstat = document.createElement('a');
    viewstat.innerHTML = 'view tags stat';
    viewstat.onclick = () => {
        var visited = ehus.visited.length;
        var taglist = Object.keys(ehus.tags);
        var tagcount = taglist.length;
        var sum = 0;
        taglist.forEach(tag => {
            sum += ehus.tags[tag];
        });
        var tagstat = [];
        taglist.forEach(tag => {
            tagstat.push({tag, count: ehus.tags[tag], precent: (ehus.tags[tag]/sum*100).toFixed(2), cprecent: (ehus.tags[tag]/visited*100).toFixed(2)});
        });
        var statstr = '';
        tagstat.sort((a, b) => b.count - a.count).forEach(tag => {
            statstr += `\n${tag.cprecent}% (${tag.count}) ${tag.tag}.`;
        });
        alert(`Total visits: ${visited}\nTotal Tags:${tagcount}${statstr}`);
    };

    document.getElementById('taglist').appendChild(viewstat);

    if (ehus.visited.some(visited => visited == gid)) {
        console.log('[eh-uts] gid visited, not adding to stat.');
        return 0;
    }

    ehus.visited.push(gid);

    var xhr = new XMLHttpRequest();
    xhr.open('POST', 'https://exhentai.org/api.php');
    xhr.setRequestHeader("Content-Type", "application/json");
    xhr.send(JSON.stringify({"method":"gdata","gidlist":[[gid,token]]}));
    xhr.onload = function () {
        if (this.status == 200) {
            var tags = JSON.parse(xhr.response).gmetadata[0].tags;
            tags.forEach(tag => {
                if (ehus.tags[tag]) ehus.tags[tag]++;
                else ehus.tags[tag] = 1;
            });
            console.log('[eh-uts] db updated:', ehus);
            localStorage.eh_usertagstat = JSON.stringify(ehus);
        }
    };
})();