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# Study Player — Load system.
#
# Reacts to entities with the NeedsLoad tag. Calls AudioAdapter.load,
# then sets the PlaybackState component (loaded, playing, duration,
# current_time=0).
#
# Registered as PRE_UPDATE so other systems in ON_UPDATE see the new state
# in the same frame.
#
# See: notes/study-player-rewrite-plan.md §5 (audio loading from argv)
module StudyPlayer
class LoadSystem
def self.build(world, player_entity, runtime, audio_file_comp, playback_state, needs_load_tag)
world.system("LoadAudio", with: [audio_file_comp], phase: Flecs::PRE_UPDATE) do |eid, af|
# Only react to entities that also have NeedsLoad
ent = world.entity_for(eid)
next unless ent.has?(needs_load_tag)
path = af[:path].to_s
next if path.empty?
success = runtime.audio.load(path)
if success
duration = runtime.audio.duration
pb = player_entity.get(playback_state) || {}
pb[:loaded] = true
pb[:playing] = true # auto-play on load
pb[:current_time] = 0.0
pb[:skip_auto_update] = 0
pb[:seek_pending] = false
pb[:seek_target] = 0.0
player_entity.set(playback_state, pb)
# Also update the AudioFile component with actual duration
af[:duration] = duration
ent.set(audio_file_comp, af)
# Start playback
runtime.audio.play
else
# Load failed — clear the file path
af[:path] = ""
ent.set(audio_file_comp, af)
end
# Clear the NeedsLoad tag (one-shot)
ent.remove(needs_load_tag)
end
end
end
end
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