/*

 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>

 *

 * This file is part of mpv.

 *

 * mpv is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * mpv 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 Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <string.h>

#include <stdlib.h>

#include <stdarg.h>

#include <stdbool.h>

#include <assert.h>

#include <math.h>

#include <ass/ass.h>

#include <ass/ass_types.h>

#include "common/common.h"

#include "common/msg.h"

#include "options/path.h"

#include "ass_mp.h"

#include "osd.h"

#include "stream/stream.h"

// res_y should be track->PlayResY

// It determines scaling of font sizes and more.

void mp_ass_set_style(ASS_Style *style, double res_y,

                      const struct osd_style_opts *opts)

{

    if (!style)

        return;

    if (opts->font) {

        if (!style->FontName || strcmp(style->FontName, opts->font) != 0) {

            free(style->FontName);

            style->FontName = strdup(opts->font);

        }

    }

    // libass_font_size = FontSize * (window_height / res_y)

    // scale translates parameters from PlayResY=720 to res_y

    double scale = res_y / 720.0;

    style->FontSize = opts->font_size * scale;

    style->PrimaryColour = MP_ASS_COLOR(opts->color);

    style->SecondaryColour = style->PrimaryColour;

    style->OutlineColour = MP_ASS_COLOR(opts->outline_color);

    style->BackColour = MP_ASS_COLOR(opts->back_color);

    style->BorderStyle = opts->border_style;

    style->Outline = opts->outline_size * scale;

    style->Shadow = opts->shadow_offset * scale;

    style->Spacing = opts->spacing * scale;

    style->MarginL = opts->margin_x * scale;

    style->MarginR = style->MarginL;

    style->MarginV = (opts->margin_y + opts->margin_y_offset) * scale;

    style->ScaleX = 1.;

    style->ScaleY = 1.;

    style->Alignment = 1 + (opts->align_x + 1) + (opts->align_y + 2) % 3 * 4;

#ifdef ASS_JUSTIFY_LEFT

    style->Justify = opts->justify;

#endif

    style->Blur = opts->blur;

    style->Bold = opts->bold;

    style->Italic = opts->italic;

}

void mp_ass_configure_fonts(ASS_Renderer *priv, struct osd_style_opts *opts,

                            struct mpv_global *global, struct mp_log *log)

{

    void *tmp = talloc_new(NULL);

    char *default_font = mp_find_config_file(tmp, global, "subfont.ttf");

    char *config       = mp_find_config_file(tmp, global, "fonts.conf");

    if (default_font && !mp_path_exists(default_font))

        default_font = NULL;

    int font_provider = ASS_FONTPROVIDER_AUTODETECT;

    if (opts->font_provider == 1)

        font_provider = ASS_FONTPROVIDER_NONE;

    if (opts->font_provider == 2)

        font_provider = ASS_FONTPROVIDER_FONTCONFIG;

    mp_verbose(log, "Setting up fonts...\n");

    ass_set_fonts(priv, default_font, opts->font, font_provider, config, 1);

    mp_verbose(log, "Done.\n");

    talloc_free(tmp);

}

static const int map_ass_level[] = {

    MSGL_ERR,           // 0 "FATAL errors"

    MSGL_WARN,

    MSGL_INFO,

    MSGL_V,

    MSGL_V,

    MSGL_DEBUG,         // 5 application recommended level

    MSGL_TRACE,

    MSGL_TRACE,         // 7 "verbose DEBUG"

};

MP_PRINTF_ATTRIBUTE(2, 0)

static void message_callback(int level, const char *format, va_list va, void *ctx)

{

    struct mp_log *log = ctx;

    if (!log)

        return;

    level = map_ass_level[level];

    mp_msg_va(log, level, format, va);

    // libass messages lack trailing \n

    mp_msg(log, level, "\n");

}

ASS_Library *mp_ass_init(struct mpv_global *global,

                         struct osd_style_opts *opts, struct mp_log *log)

{

    char *path = opts->fonts_dir && opts->fonts_dir[0] ?

                 mp_get_user_path(NULL, global, opts->fonts_dir) :

                 mp_find_config_file(NULL, global, "fonts");

    mp_dbg(log, "ASS library version: 0x%x (runtime 0x%x)\n",

           (unsigned)LIBASS_VERSION, ass_library_version());

    ASS_Library *priv = ass_library_init();

    if (!priv)

        abort();

    ass_set_message_cb(priv, message_callback, log);

    if (path)

        ass_set_fonts_dir(priv, path);

    talloc_free(path);

    return priv;

}

void mp_ass_flush_old_events(ASS_Track *track, long long ts)

{

    int n = 0;

    for (; n < track->n_events; n++) {

        if ((track->events[n].Start + track->events[n].Duration) >= ts)

            break;

        ass_free_event(track, n);

        track->n_events--;

    }

    for (int i = 0; n > 0 && i < track->n_events; i++) {

        track->events[i] = track->events[i+n];

    }

}

// Set *out_rc to [x0, y0, x1, y1] of the graphical bounding box in script

// coordinates.

// Set it to [inf, inf, -inf, -inf] if empty.

void mp_ass_get_bb(ASS_Image *image_list, ASS_Track *track,

                   struct mp_osd_res *res, double *out_rc)

{

    double rc[4] = {INFINITY, INFINITY, -INFINITY, -INFINITY};

    for (ASS_Image *img = image_list; img; img = img->next) {

        if (img->w == 0 || img->h == 0)

            continue;

        rc[0] = MPMIN(rc[0], img->dst_x);

        rc[1] = MPMIN(rc[1], img->dst_y);

        rc[2] = MPMAX(rc[2], img->dst_x + img->w);

        rc[3] = MPMAX(rc[3], img->dst_y + img->h);

    }

    double scale = track->PlayResY / (double)MPMAX(res->h, 1);

    if (scale > 0) {

        for (int i = 0; i < 4; i++)

            out_rc[i] = rc[i] * scale;

    }

}