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/*
 * This file is part of mpv.
 *
 * mpv is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with mpv.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stddef.h>
#include <stdbool.h>
#include <inttypes.h>
#include <math.h>
#include <assert.h>

#include "config.h"
#include "mpv_talloc.h"

#include "common/msg.h"
#include "options/options.h"
#include "common/common.h"
#include "common/global.h"

#include "stream/stream.h"
#include "sub/dec_sub.h"
#include "demux/demux.h"
#include "video/mp_image.h"
#include "video/decode/dec_video.h"
#include "video/filter/vf.h"

#include "core.h"

// 0: primary sub, 1: secondary sub, -1: not selected
static int get_order(struct MPContext *mpctx, struct track *track)
{
    for (int n = 0; n < NUM_PTRACKS; n++) {
        if (mpctx->current_track[n][STREAM_SUB] == track)
            return n;
    }
    return -1;
}

static void reset_subtitles(struct MPContext *mpctx, struct track *track)
{
    if (track->d_sub)
        sub_reset(track->d_sub);
    term_osd_set_subs(mpctx, NULL);
}

void reset_subtitle_state(struct MPContext *mpctx)
{
    for (int n = 0; n < mpctx->num_tracks; n++) {
        struct dec_sub *d_sub = mpctx->tracks[n]->d_sub;
        if (d_sub)
            sub_reset(d_sub);
    }
    term_osd_set_subs(mpctx, NULL);
}

void uninit_sub(struct MPContext *mpctx, struct track *track)
{
    if (track && track->d_sub) {
        reset_subtitles(mpctx, track);
        sub_select(track->d_sub, false);
        int order = get_order(mpctx, track);
        if (order >= 0 && order <= 1)
            osd_set_sub(mpctx->osd, OSDTYPE_SUB + order, NULL);
        reselect_demux_streams(mpctx);
    }
}

void uninit_sub_all(struct MPContext *mpctx)
{
    for (int n = 0; n < mpctx->num_tracks; n++)
        uninit_sub(mpctx, mpctx->tracks[n]);
}

static bool update_subtitle(struct MPContext *mpctx, double video_pts,
                            struct track *track)
{
    struct MPOpts *opts = mpctx->opts;
    struct dec_sub *dec_sub = track ? track->d_sub : NULL;

    if (!dec_sub || video_pts == MP_NOPTS_VALUE)
        return true;

    if (mpctx->vo_chain) {
        struct mp_image_params params = mpctx->vo_chain->vf->input_params;
        if (params.imgfmt)
            sub_set_video_fmt(dec_sub, &params);
    }

    video_pts -= opts->sub_delay;

    if (!track->preloaded && track->demuxer->fully_read && !opts->sub_clear_on_seek)
    {
        // Assume fully_read implies no interleaved audio/video streams.
        // (Reading packets will change the demuxer position.)
        demux_seek(track->demuxer, 0, SEEK_ABSOLUTE);
        track->preloaded = sub_read_all_packets(track->d_sub);
    }

    if (!sub_read_packets(dec_sub, video_pts))
        return false;

    // Handle displaying subtitles on terminal; never done for secondary subs
    if (mpctx->current_track[0][STREAM_SUB] == track && !mpctx->video_out)
        term_osd_set_subs(mpctx, sub_get_text(dec_sub, video_pts));

    return true;
}

// Return true if the subtitles for the given PTS are ready; false if the player
// should wait for new demuxer data, and then should retry.
bool update_subtitles(struct MPContext *mpctx, double video_pts)
{
    bool ok = true;
    for (int n = 0; n < NUM_PTRACKS; n++)
        ok &= update_subtitle(mpctx, video_pts, mpctx->current_track[n][STREAM_SUB]);
    return ok;
}

static bool init_subdec(struct MPContext *mpctx, struct track *track)
{
    assert(!track->d_sub);

    if (!track->demuxer || !track->stream)
        return false;

    track->d_sub = sub_create(mpctx->global, track->demuxer, track->stream);
    if (!track->d_sub)
        return false;

    struct track *vtrack = mpctx->current_track[0][STREAM_VIDEO];
    struct mp_codec_params *v_c =
        vtrack && vtrack->stream ? vtrack->stream->codec : NULL;
    double fps = v_c ? v_c->fps : 25;
    sub_control(track->d_sub, SD_CTRL_SET_VIDEO_DEF_FPS, &fps);

    return true;
}

void reinit_sub(struct MPContext *mpctx, struct track *track)
{
    if (!track || !track->stream || track->stream->type != STREAM_SUB)
        return;

    if (!track->d_sub && !init_subdec(mpctx, track)) {
        error_on_track(mpctx, track);
        return;
    }

    sub_select(track->d_sub, true);
    int order = get_order(mpctx, track);
    if (order >= 0 && order <= 1)
        osd_set_sub(mpctx->osd, OSDTYPE_SUB + order, track->d_sub);
    sub_control(track->d_sub, SD_CTRL_SET_TOP, &(bool){!!order});
}

void reinit_sub_all(struct MPContext *mpctx)
{
    for (int n = 0; n < NUM_PTRACKS; n++)
        reinit_sub(mpctx, mpctx->current_track[n][STREAM_SUB]);
}