-- 050_data_validation_constraints.sql
-- Data Validation Constraints (BE-DB-011: Add database constraints for data validation)
-- Add CHECK constraints for status values, enum constraints

-- === TRACKS STATUS CONSTRAINTS ===
-- Constraint for track status (uploading, processing, completed, failed)
ALTER TABLE public.tracks 
ADD CONSTRAINT IF NOT EXISTS chk_tracks_status_valid 
CHECK (status IN ('uploading', 'processing', 'completed', 'failed'));

-- Constraint for stream_status (pending, processing, ready, error)
ALTER TABLE public.tracks 
ADD CONSTRAINT IF NOT EXISTS chk_tracks_stream_status_valid 
CHECK (stream_status IN ('pending', 'processing', 'ready', 'error'));

-- Constraint for counts (non-negative)
ALTER TABLE public.tracks 
ADD CONSTRAINT IF NOT EXISTS chk_tracks_counts_non_negative 
CHECK (play_count >= 0 AND like_count >= 0 AND comment_count >= 0 AND download_count >= 0);

-- Constraint for year (reasonable range)
ALTER TABLE public.tracks 
ADD CONSTRAINT IF NOT EXISTS chk_tracks_year_valid 
CHECK (year >= 0 AND year <= EXTRACT(YEAR FROM CURRENT_DATE) + 10);

-- === PLAYLISTS CONSTRAINTS ===
-- Constraint for counts (non-negative)
ALTER TABLE public.playlists 
ADD CONSTRAINT IF NOT EXISTS chk_playlists_counts_non_negative 
CHECK (track_count >= 0 AND follower_count >= 0);

-- === PLAYLIST_TRACKS CONSTRAINTS ===
-- Constraint for position (positive)
ALTER TABLE public.playlist_tracks 
ADD CONSTRAINT IF NOT EXISTS chk_playlist_tracks_position_positive 
CHECK (position >= 0);

-- === HLSTranscodeQueue CONSTRAINTS ===
-- Constraint for queue status (pending, processing, completed, failed)
ALTER TABLE public.hls_transcode_queue 
ADD CONSTRAINT IF NOT EXISTS chk_hls_transcode_queue_status_valid 
CHECK (status IN ('pending', 'processing', 'completed', 'failed'));

-- Constraint for retry counts (non-negative)
ALTER TABLE public.hls_transcode_queue 
ADD CONSTRAINT IF NOT EXISTS chk_hls_transcode_queue_retry_valid 
CHECK (retry_count >= 0 AND max_retries >= 0);

-- Constraint for priority (reasonable range)
ALTER TABLE public.hls_transcode_queue 
ADD CONSTRAINT IF NOT EXISTS chk_hls_transcode_queue_priority_valid 
CHECK (priority >= 1 AND priority <= 10);

-- === TRACK_COMMENTS CONSTRAINTS ===
-- Constraint for content length (already exists, but ensure it's there)
-- Note: chk_track_comments_content_length already exists in 041_streaming_analytics.sql

-- === TRACK_PLAYS CONSTRAINTS ===
-- Constraint for duration (non-negative)
ALTER TABLE public.track_plays 
ADD CONSTRAINT IF NOT EXISTS chk_track_plays_duration_non_negative 
CHECK (duration >= 0);

-- === PLAYBACK_ANALYTICS CONSTRAINTS ===
-- Constraint for completion_rate (0-100)
ALTER TABLE public.playback_analytics 
ADD CONSTRAINT IF NOT EXISTS chk_playback_analytics_completion_rate 
CHECK (completion_rate >= 0 AND completion_rate <= 100);

-- Constraint for counts (non-negative)
ALTER TABLE public.playback_analytics 
ADD CONSTRAINT IF NOT EXISTS chk_playback_analytics_counts_non_negative 
CHECK (play_time >= 0 AND pause_count >= 0 AND seek_count >= 0);

-- === PLAYLIST_VERSION CONSTRAINTS ===
-- Constraint for version (positive)
ALTER TABLE public.playlist_versions 
ADD CONSTRAINT IF NOT EXISTS chk_playlist_versions_version_positive 
CHECK (version > 0);

-- Constraint for action (created, updated, restored)
ALTER TABLE public.playlist_versions 
ADD CONSTRAINT IF NOT EXISTS chk_playlist_versions_action_valid 
CHECK (action IN ('created', 'updated', 'restored'));

-- === TRACK_HISTORY CONSTRAINTS ===
-- Constraint for action (created, updated, deleted, published, unpublished, restored)
ALTER TABLE public.track_history 
ADD CONSTRAINT IF NOT EXISTS chk_track_history_action_valid 
CHECK (action IN ('created', 'updated', 'deleted', 'published', 'unpublished', 'restored'));

-- === BITRATE_ADAPTATION CONSTRAINTS ===
-- Constraint for reason (network_slow, network_fast, user_selected, buffer_low)
ALTER TABLE public.bitrate_adaptation_logs 
ADD CONSTRAINT IF NOT EXISTS chk_bitrate_adaptation_reason_valid 
CHECK (reason IN ('network_slow', 'network_fast', 'user_selected', 'buffer_low'));

-- Constraint for bitrates (positive)
ALTER TABLE public.bitrate_adaptation_logs 
ADD CONSTRAINT IF NOT EXISTS chk_bitrate_adaptation_bitrates_positive 
CHECK (old_bitrate > 0 AND new_bitrate > 0);

-- === NOTIFICATIONS CONSTRAINTS ===
-- Constraint for type (reasonable length)
ALTER TABLE public.notifications 
ADD CONSTRAINT IF NOT EXISTS chk_notifications_type_length 
CHECK (LENGTH(type) >= 1 AND LENGTH(type) <= 50);

-- Constraint for title (reasonable length)
ALTER TABLE public.notifications 
ADD CONSTRAINT IF NOT EXISTS chk_notifications_title_length 
CHECK (LENGTH(title) >= 1 AND LENGTH(title) <= 255);

-- === USER_PROFILES CONSTRAINTS ===
-- Constraint for counts (non-negative)
ALTER TABLE public.user_profiles 
ADD CONSTRAINT IF NOT EXISTS chk_user_profiles_counts_non_negative 
CHECK (follower_count >= 0 AND following_count >= 0 AND track_count >= 0 AND playlist_count >= 0);

-- Comments
COMMENT ON CONSTRAINT chk_tracks_status_valid ON public.tracks IS 'Validates track status values';
COMMENT ON CONSTRAINT chk_tracks_stream_status_valid ON public.tracks IS 'Validates stream status values';
COMMENT ON CONSTRAINT chk_hls_transcode_queue_status_valid ON public.hls_transcode_queue IS 'Validates queue status values';
COMMENT ON CONSTRAINT chk_playlist_versions_action_valid ON public.playlist_versions IS 'Validates playlist version action values';
COMMENT ON CONSTRAINT chk_track_history_action_valid ON public.track_history IS 'Validates track history action values';
COMMENT ON CONSTRAINT chk_bitrate_adaptation_reason_valid ON public.bitrate_adaptation_logs IS 'Validates bitrate adaptation reason values';