-- Create synthetic_monitors table
CREATE TABLE IF NOT EXISTS synthetic_monitors (
    id SERIAL PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    type VARCHAR(50) NOT NULL CHECK (type IN ('http_status', 'ping', 'port_check')),
    target VARCHAR(500) NOT NULL,
    expected_status INTEGER,
    port INTEGER,
    interval INTEGER NOT NULL DEFAULT 60,
    enabled BOOLEAN DEFAULT TRUE,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
);

-- Create monitor_results table
CREATE TABLE IF NOT EXISTS monitor_results (
    id SERIAL PRIMARY KEY,
    monitor_id INTEGER NOT NULL REFERENCES synthetic_monitors(id) ON DELETE CASCADE,
    status VARCHAR(20) NOT NULL CHECK (status IN ('success', 'failed')),
    response_time INTEGER,
    message TEXT,
    timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
);

-- Create indexes for better query performance
CREATE INDEX IF NOT EXISTS idx_monitor_results_monitor_id ON monitor_results(monitor_id);
CREATE INDEX IF NOT EXISTS idx_monitor_results_timestamp ON monitor_results(timestamp DESC);
CREATE INDEX IF NOT EXISTS idx_synthetic_monitors_enabled ON synthetic_monitors(enabled) WHERE enabled = TRUE;

-- Create function to update updated_at timestamp
CREATE OR REPLACE FUNCTION update_updated_at_column()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

-- Create trigger to automatically update updated_at
DROP TRIGGER IF EXISTS trigger_update_synthetic_monitors_updated_at ON synthetic_monitors;
CREATE TRIGGER trigger_update_synthetic_monitors_updated_at
    BEFORE UPDATE ON synthetic_monitors
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();