-- API Tokens Table
CREATE TABLE IF NOT EXISTS api_tokens (
    id SERIAL PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    token VARCHAR(255) UNIQUE NOT NULL,
    description TEXT,
    user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,
    active BOOLEAN DEFAULT true,
    rate_limit INTEGER DEFAULT 100, -- requests per minute
    allowed_endpoints TEXT[], -- null = all endpoints allowed
    expires_at TIMESTAMP,
    last_used_at TIMESTAMP,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- API Token Usage Tracking
CREATE TABLE IF NOT EXISTS api_token_usage (
    id SERIAL PRIMARY KEY,
    token_id INTEGER REFERENCES api_tokens(id) ON DELETE CASCADE,
    endpoint VARCHAR(255) NOT NULL,
    method VARCHAR(10) NOT NULL,
    status_code INTEGER,
    response_time_ms INTEGER,
    request_size INTEGER, -- bytes
    response_size INTEGER, -- bytes
    ip_address INET,
    user_agent TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Indexes for performance
CREATE INDEX IF NOT EXISTS idx_api_tokens_token ON api_tokens(token);
CREATE INDEX IF NOT EXISTS idx_api_tokens_active ON api_tokens(active);
CREATE INDEX IF NOT EXISTS idx_api_token_usage_token_id ON api_token_usage(token_id);
CREATE INDEX IF NOT EXISTS idx_api_token_usage_created_at ON api_token_usage(created_at);
CREATE INDEX IF NOT EXISTS idx_api_token_usage_endpoint ON api_token_usage(endpoint);

-- Function to update updated_at timestamp
CREATE OR REPLACE FUNCTION update_api_token_updated_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = CURRENT_TIMESTAMP;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER api_tokens_updated_at
    BEFORE UPDATE ON api_tokens
    FOR EACH ROW
    EXECUTE FUNCTION update_api_token_updated_at();