-- V17: Enhanced Sharing System
-- Replaces simple share_links with comprehensive sharing capabilities
-- Enhanced shares table
CREATE TABLE shares (
  id TEXT PRIMARY KEY NOT NULL,
  target_type TEXT NOT NULL CHECK (
    target_type IN ('media', 'collection', 'tag', 'saved_search')
  ),
  target_id TEXT NOT NULL,
  owner_id TEXT NOT NULL,
  recipient_type TEXT NOT NULL CHECK (
    recipient_type IN ('public_link', 'user', 'group', 'federated')
  ),
  recipient_user_id TEXT,
  recipient_group_id TEXT,
  recipient_federated_handle TEXT,
  recipient_federated_server TEXT,
  public_token TEXT UNIQUE,
  public_password_hash TEXT,
  perm_view INTEGER NOT NULL DEFAULT 1,
  perm_download INTEGER NOT NULL DEFAULT 0,
  perm_edit INTEGER NOT NULL DEFAULT 0,
  perm_delete INTEGER NOT NULL DEFAULT 0,
  perm_reshare INTEGER NOT NULL DEFAULT 0,
  perm_add INTEGER NOT NULL DEFAULT 0,
  note TEXT,
  expires_at TEXT,
  access_count INTEGER NOT NULL DEFAULT 0,
  last_accessed TEXT,
  inherit_to_children INTEGER NOT NULL DEFAULT 1,
  parent_share_id TEXT,
  created_at TEXT NOT NULL,
  updated_at TEXT NOT NULL,
  FOREIGN KEY (owner_id) REFERENCES users (id) ON DELETE CASCADE,
  FOREIGN KEY (recipient_user_id) REFERENCES users (id) ON DELETE CASCADE,
  FOREIGN KEY (parent_share_id) REFERENCES shares (id) ON DELETE CASCADE,
  UNIQUE (
    owner_id,
    target_type,
    target_id,
    recipient_type,
    recipient_user_id
  )
);

CREATE INDEX idx_shares_owner ON shares (owner_id);

CREATE INDEX idx_shares_recipient_user ON shares (recipient_user_id);

CREATE INDEX idx_shares_target ON shares (target_type, target_id);

CREATE INDEX idx_shares_token ON shares (public_token);

CREATE INDEX idx_shares_expires ON shares (expires_at);

-- Share activity log
CREATE TABLE share_activity (
  id TEXT PRIMARY KEY NOT NULL,
  share_id TEXT NOT NULL,
  actor_id TEXT,
  actor_ip TEXT,
  action TEXT NOT NULL,
  details TEXT,
  timestamp TEXT NOT NULL,
  FOREIGN KEY (share_id) REFERENCES shares (id) ON DELETE CASCADE,
  FOREIGN KEY (actor_id) REFERENCES users (id) ON DELETE SET NULL
);

CREATE INDEX idx_share_activity_share ON share_activity (share_id);

CREATE INDEX idx_share_activity_timestamp ON share_activity (timestamp);

-- Share notifications
CREATE TABLE share_notifications (
  id TEXT PRIMARY KEY NOT NULL,
  user_id TEXT NOT NULL,
  share_id TEXT NOT NULL,
  notification_type TEXT NOT NULL,
  is_read INTEGER NOT NULL DEFAULT 0,
  created_at TEXT NOT NULL,
  FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE,
  FOREIGN KEY (share_id) REFERENCES shares (id) ON DELETE CASCADE
);

CREATE INDEX idx_share_notifications_user ON share_notifications (user_id);

CREATE INDEX idx_share_notifications_unread ON share_notifications (user_id, is_read)
WHERE
  is_read = 0;

-- Migrate existing share_links to new shares table (if share_links exists)
INSERT
OR IGNORE INTO shares (
  id,
  target_type,
  target_id,
  owner_id,
  recipient_type,
  public_token,
  public_password_hash,
  perm_view,
  perm_download,
  access_count,
  expires_at,
  created_at,
  updated_at
)
SELECT
  id,
  'media',
  media_id,
  created_by,
  'public_link',
  token,
  password_hash,
  1,
  1,
  view_count,
  expires_at,
  created_at,
  created_at
FROM
  share_links
WHERE
  EXISTS (
    SELECT
      1
    FROM
      sqlite_master
    WHERE
      type = 'table'
      AND name = 'share_links'
  );