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# Study Player — Seek system (PRE_UPDATE).
#
# Applies a pending seek intent:
# 1. Calls Rl.seek_music_stream to the target position.
# 2. Sets current_time = seek_target (instant visual update).
# 3. Sets skip_auto_update = N to implement non-blocking seek cooldown.
# 4. Clears seek_pending.
#
# Running in PRE_UPDATE means the subsequent UpdateSystem (ON_UPDATE)
# sees the already-applied seek and honours the cooldown counter.
#
# See: notes/study-player-rewrite-plan.md §7 (non-blocking seek design)
module StudyPlayer
class SeekSystem
# Number of frames to skip current_time auto-update after a seek.
# 3 frames at 60 fps = ~50 ms — enough for raylib's miniaudio stream
# to flush and report a stable time.
SKIP_FRAMES = 3
def self.build(world, player_entity, runtime, playback_state)
world.system("ApplySeek", with: [], phase: Flecs::PRE_UPDATE) do
pb = player_entity.get(playback_state)
next unless pb && pb[:loaded] && pb[:seek_pending]
audio = runtime.audio
next unless audio.loaded?
target = pb[:seek_target]
# Apply the seek
audio.seek(target)
# Update component state
pb[:current_time] = target
pb[:skip_auto_update] = SKIP_FRAMES
pb[:seek_pending] = false
player_entity.set(playback_state, pb)
end
end
end
end
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