/**
 * @file Definiert Tabellen für Bildanhänge und Analyse-Caches und bereitet Anhangsmetadaten auf.
 */
export function initializeAttachments(db) {
    db.exec(`
        CREATE TABLE IF NOT EXISTS attachments (
            id TEXT PRIMARY KEY, username TEXT NOT NULL REFERENCES users(username) ON DELETE CASCADE ON UPDATE CASCADE,
            original_name TEXT NOT NULL, storage_key TEXT NOT NULL UNIQUE, mime_type TEXT NOT NULL,
            size_bytes INTEGER NOT NULL, width INTEGER NOT NULL, height INTEGER NOT NULL,
            status TEXT NOT NULL DEFAULT 'temporary' CHECK(status IN ('temporary','attached')),
            created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
            vision_model TEXT, vision_analysis TEXT, vision_analyzed_at TEXT
        );
        CREATE TABLE IF NOT EXISTS message_attachments (
            message_id INTEGER NOT NULL REFERENCES chat_messages(id) ON DELETE CASCADE,
            attachment_id TEXT NOT NULL REFERENCES attachments(id) ON DELETE CASCADE,
            position INTEGER NOT NULL DEFAULT 0, PRIMARY KEY(message_id, attachment_id)
        );
        CREATE INDEX IF NOT EXISTS attachment_references ON message_attachments(attachment_id);
        CREATE TABLE IF NOT EXISTS attachment_vision_analyses (
            attachment_id TEXT NOT NULL REFERENCES attachments(id) ON DELETE CASCADE,
            vision_model TEXT NOT NULL,
            prompt_version INTEGER NOT NULL,
            question TEXT NOT NULL,
            analysis TEXT NOT NULL,
            analyzed_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (attachment_id, vision_model, prompt_version, question)
        );
        CREATE TABLE IF NOT EXISTS upload_deletions (storage_key TEXT PRIMARY KEY);
        CREATE TABLE IF NOT EXISTS upload_leases (
            token TEXT PRIMARY KEY,
            username TEXT NOT NULL REFERENCES users(username) ON DELETE CASCADE,
            created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );
        CREATE INDEX IF NOT EXISTS upload_leases_user ON upload_leases(username);
        CREATE TABLE IF NOT EXISTS workspace_operation_leases (
            username TEXT PRIMARY KEY REFERENCES users(username) ON DELETE CASCADE,
            token TEXT NOT NULL UNIQUE,
            created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
        );
        CREATE TRIGGER IF NOT EXISTS release_message_attachment AFTER DELETE ON message_attachments
        BEGIN
            DELETE FROM attachments WHERE id = OLD.attachment_id AND status = 'attached'
            AND NOT EXISTS (SELECT 1 FROM message_attachments WHERE attachment_id = OLD.attachment_id);
        END;
        CREATE TRIGGER IF NOT EXISTS queue_attachment_file_delete AFTER DELETE ON attachments
        BEGIN INSERT OR IGNORE INTO upload_deletions(storage_key) VALUES(OLD.storage_key); END;
    `);
}

export const attachmentMetadata = (row) => ({
    id: row.id, type: "image", originalName: row.original_name, mimeType: row.mime_type,
    sizeBytes: row.size_bytes, width: row.width, height: row.height
});