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#include "player.h"
#include "list.h"
#include "data.h"
static bool player_history_contains(struct track *cmp, int depth);
static struct track *playlist_track_next_unused(struct link *start);
static struct track *player_next_from_playlist(void);
bool
player_history_contains(struct track *cmp, int depth)
{
struct link *link;
struct track *track;
link = list_back(&player.history);
while (LIST_INNER(link) && depth-- > 0) {
track = UPCAST(link, struct track, link_hs);
if (track == cmp)
return true;
link = link->prev;
}
return false;
}
struct track *
playlist_track_next_unused(struct link *start)
{
struct track *track;
struct link *link;
bool in_history;
int len;
track = NULL;
len = list_len(&player.playlist);
if (!len) return NULL;
link = start;
while (LIST_INNER(link)) {
track = UPCAST(link, struct track, link_pl);
in_history = player_history_contains(track, len - 2);
if (track != player.track && !in_history)
break;
link = link->next;
if (!LIST_INNER(link))
link = list_front(&player.playlist);
if (link == start)
return NULL;
}
return track;
}
struct track *
player_next_from_playlist(void)
{
struct link *link;
int index;
if (list_empty(&player.playlist))
return NULL;
if (player.shuffle) {
index = rand() % list_len(&player.playlist);
link = list_at(&player.playlist, index);
return playlist_track_next_unused(link);
} else {
if (player.track && link_inuse(&player.track->link_pl)) {
index = list_index(&player.playlist,
&player.track->link_pl);
if (index < 0) PANIC();
if (++index == list_len(&player.playlist))
return NULL;
} else {
index = 0;
}
link = list_at(&player.playlist, index);
return UPCAST(link, struct track, link_pl);
}
return NULL;
}
int
player_prev(void)
{
struct link *next;
struct track *track;
if (list_empty(&player.history))
return PLAYER_STATUS_ERR;
if (!player.track || !link_inuse(&player.track->link_hs)) {
next = list_back(&player.history);
} else if (LIST_INNER(player.track->link_hs.prev)) {
next = player.track->link_hs.prev;
} else {
return PLAYER_STATUS_ERR;
}
track = UPCAST(next, struct track, link_hs);
player_play_track(track, false);
return PLAYER_STATUS_OK;
}
int
player_next(void)
{
struct track *next_track;
struct link *link;
bool new_entry;
if (player.track && link_inuse(&player.track->link_hs)
&& LIST_INNER(player.track->link_hs.next)) {
next_track = UPCAST(player.track->link_hs.next,
struct track, link_hs);
new_entry = false;
} else if (!list_empty(&player.queue)) {
link = list_pop_front(&player.queue);
next_track = UPCAST(link, struct track, link_pq);
new_entry = true;
} else {
next_track = player_next_from_playlist();
if (!next_track) goto clear;
new_entry = true;
}
player_play_track(next_track, new_entry);
return PLAYER_STATUS_OK;
clear:
player_clear_track();
return PLAYER_STATUS_ERR;
}
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