-- Migration: Add anonymize_names, expires_at, access_password_hash to share_links
-- Run this on existing database

-- 1. Add anonymize_names column (default false = show names)
ALTER TABLE share_links ADD COLUMN IF NOT EXISTS anonymize_names BOOLEAN DEFAULT false;

-- 2. Add expires_at column (default 7 days from creation, nullable for backward compat)
ALTER TABLE share_links ADD COLUMN IF NOT EXISTS expires_at TIMESTAMPTZ;

-- 3. Add access_password_hash column for bcrypt password protection
ALTER TABLE share_links ADD COLUMN IF NOT EXISTS access_password_hash VARCHAR(255);

-- 4. Update existing links to have expires_at = created_at + 7 days (optional, for existing links)
-- UPDATE share_links SET expires_at = created_at + interval '7 days' WHERE expires_at IS NULL;

-- 5. Add index for cleanup of expired links
CREATE INDEX IF NOT EXISTS idx_share_links_expires_at ON share_links(expires_at);

-- 6. Add public message and external link shown on the share page
ALTER TABLE share_links ADD COLUMN IF NOT EXISTS message TEXT;
ALTER TABLE share_links ADD COLUMN IF NOT EXISTS link_url VARCHAR(500);

-- 7. Per-link visibility overrides (NULL = fall back to global settings)
ALTER TABLE share_links ADD COLUMN IF NOT EXISTS show_student_message BOOLEAN;
ALTER TABLE share_links ADD COLUMN IF NOT EXISTS show_entry_date BOOLEAN;
ALTER TABLE share_links ADD COLUMN IF NOT EXISTS show_group_photos BOOLEAN;

-- 8. Replace anonymize_names with positive show_student_names (NULL = inherit global setting)
DO $$
BEGIN
  IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'share_links' AND column_name = 'anonymize_names') THEN
    ALTER TABLE share_links ADD COLUMN IF NOT EXISTS show_student_names BOOLEAN;
    UPDATE share_links SET show_student_names = (NOT anonymize_names) WHERE anonymize_names IS NOT NULL;
    ALTER TABLE share_links DROP COLUMN anonymize_names;
  END IF;
END $$;