/*
 * Treebird - Lightweight frontend for Pleroma
 * Copyright (C) 2022 Nekobit
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "math.h"
#include "hashtag.h"
#include "string_helpers.h"
#include "easprintf.h"
#include "../config.h"

// Pages
#include "../static/hashtag.ctmpl"
#include "../static/hashtag_page.ctmpl"

#define TAG_SIZE_INITIAL 12

static unsigned hashtag_history_daily_uses(size_t max, struct mstdnt_history* history, size_t history_len)
{
    unsigned total = 0;

    for (int i = 0; i < history_len && i < max; ++i)
        total += history[i].uses;
    
    return total;
}

char* construct_hashtag(struct mstdnt_tag* hashtag, size_t* size)
{
    // Lol!
    unsigned hash_size = TAG_SIZE_INITIAL +
        CLAMP(hashtag_history_daily_uses(7, hashtag->history, hashtag->history_len)*2, 0, 42);

    struct hashtag_template data = {
        .prefix = config_url_prefix,
        .tag = hashtag->name,
        .tag_size = hash_size,
    };
    return tmpl_gen_hashtag(&data, size);
}

static char* construct_hashtag_voidwrap(void* passed, size_t index, size_t* res)
{
    return construct_hashtag((struct mstdnt_tag*)passed + index, res);
}

char* construct_hashtags(struct mstdnt_tag* hashtags, size_t size, size_t* ret_size)
{
    if (!(hashtags && size)) return NULL;
    return construct_func_strings(construct_hashtag_voidwrap, hashtags, size, ret_size);
}