-- ============================================================
-- Migration: 010_create_notification_history
-- Date: 2025-01-26
-- Description: Create table for logging all sent notifications
-- ============================================================

-- UP: Apply migration
-- ============================================================

CREATE TABLE IF NOT EXISTS notification_history (
    id SERIAL PRIMARY KEY,

    -- Who received the notification
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,

    -- Related beneficiary (optional, for beneficiary-related notifications)
    beneficiary_id INTEGER REFERENCES users(id) ON DELETE SET NULL,

    -- Notification content
    title VARCHAR(255) NOT NULL,
    body TEXT NOT NULL,

    -- Notification type (emergency, activity, low_battery, daily, weekly, system)
    type VARCHAR(50) NOT NULL,

    -- Delivery channel (push, email, sms)
    channel VARCHAR(20) NOT NULL DEFAULT 'push',

    -- Delivery status
    status VARCHAR(20) NOT NULL DEFAULT 'pending' CHECK (status IN (
        'pending',    -- queued for delivery
        'sent',       -- successfully sent to provider
        'delivered',  -- confirmed delivered (if supported)
        'failed',     -- delivery failed
        'skipped'     -- skipped due to settings
    )),

    -- Skip/failure reason (if applicable)
    skip_reason VARCHAR(100),

    -- Additional data payload (JSON)
    data JSONB,

    -- Expo push ticket ID (for tracking delivery status)
    expo_ticket_id VARCHAR(255),

    -- Error details (if failed)
    error_message TEXT,

    -- Timestamps
    created_at TIMESTAMPTZ DEFAULT NOW(),
    sent_at TIMESTAMPTZ,
    delivered_at TIMESTAMPTZ
);

-- Indexes for common queries
CREATE INDEX IF NOT EXISTS idx_notification_history_user ON notification_history(user_id);
CREATE INDEX IF NOT EXISTS idx_notification_history_beneficiary ON notification_history(beneficiary_id);
CREATE INDEX IF NOT EXISTS idx_notification_history_type ON notification_history(type);
CREATE INDEX IF NOT EXISTS idx_notification_history_status ON notification_history(status);
CREATE INDEX IF NOT EXISTS idx_notification_history_created ON notification_history(created_at DESC);
CREATE INDEX IF NOT EXISTS idx_notification_history_user_created ON notification_history(user_id, created_at DESC);

-- Comments
COMMENT ON TABLE notification_history IS 'Log of all sent/attempted notifications';
COMMENT ON COLUMN notification_history.type IS 'Notification type: emergency, activity, low_battery, daily, weekly, system';
COMMENT ON COLUMN notification_history.channel IS 'Delivery channel: push, email, sms';
COMMENT ON COLUMN notification_history.status IS 'Delivery status: pending, sent, delivered, failed, skipped';
COMMENT ON COLUMN notification_history.skip_reason IS 'Reason for skipping: push_disabled, quiet_hours, no_tokens, etc.';
COMMENT ON COLUMN notification_history.expo_ticket_id IS 'Expo Push API ticket ID for delivery tracking';

-- ============================================================
-- DOWN: Rollback migration (for reference only)
-- ============================================================
-- DROP TABLE IF EXISTS notification_history;