-- Migration 015: Create notification tables
-- NotificationRule: admin-defined rules for triggering notifications
-- Notification: individual notification instance
-- NotificationDelivery: tracks delivery attempts per channel

-- Admin-defined notification rule
CREATE TABLE notification_rules (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    name VARCHAR(200) NOT NULL,
    description TEXT,
    is_active BOOLEAN NOT NULL DEFAULT TRUE,

    -- Event types that trigger this rule (array of event_type strings)
    event_types VARCHAR(50)[] NOT NULL,

    -- Channels to deliver through (array of notification_channel strings)
    channels VARCHAR(10)[] NOT NULL,

    -- Target roles (array of team_role strings, optional)
    target_roles VARCHAR(20)[],

    -- Custom conditions for triggering (JSONB)
    conditions JSONB NOT NULL DEFAULT '{}'::JSONB,

    -- Templates
    subject_template VARCHAR(500),
    body_template TEXT
);

-- M2M: NotificationRule targets specific TeamProfiles
CREATE TABLE notification_rule_team_profiles (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    rule_id UUID NOT NULL REFERENCES notification_rules(id) ON DELETE CASCADE,
    team_profile_id UUID NOT NULL REFERENCES team_profiles(id) ON DELETE CASCADE,

    UNIQUE (rule_id, team_profile_id)
);

-- M2M: NotificationRule targets specific CustomerProfiles
CREATE TABLE notification_rule_customer_profiles (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    rule_id UUID NOT NULL REFERENCES notification_rules(id) ON DELETE CASCADE,
    customer_profile_id UUID NOT NULL REFERENCES customer_profiles(id) ON DELETE CASCADE,

    UNIQUE (rule_id, customer_profile_id)
);

-- Individual notification instance
CREATE TABLE notifications (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    -- Polymorphic: recipient type
    recipient_type VARCHAR(20) NOT NULL,  -- 'team_profile' or 'customer_profile'
    recipient_id UUID NOT NULL,

    -- References
    rule_id UUID REFERENCES notification_rules(id) ON DELETE SET NULL,
    event_id UUID,  -- FK added in migration 016 after events table exists

    status notification_status NOT NULL DEFAULT 'PENDING',
    subject VARCHAR(500) NOT NULL,
    body TEXT NOT NULL,

    -- URL to navigate to when notification is clicked
    action_url VARCHAR(500),

    read_at TIMESTAMPTZ,
    metadata JSONB NOT NULL DEFAULT '{}'::JSONB
);

-- Notification delivery attempt
CREATE TABLE notification_deliveries (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    notification_id UUID NOT NULL REFERENCES notifications(id) ON DELETE CASCADE,

    channel notification_channel NOT NULL,
    status delivery_status NOT NULL DEFAULT 'PENDING',

    attempts INTEGER NOT NULL DEFAULT 0 CHECK (attempts >= 0),
    last_attempt_at TIMESTAMPTZ,
    sent_at TIMESTAMPTZ,
    delivered_at TIMESTAMPTZ,

    error_message TEXT,

    -- External service ID (e.g., email provider message ID)
    external_id VARCHAR(200),

    metadata JSONB NOT NULL DEFAULT '{}'::JSONB
);

-- Indexes
CREATE INDEX idx_notification_rules_active ON notification_rules(is_active);
CREATE INDEX idx_notification_rule_team_profiles_rule ON notification_rule_team_profiles(rule_id);
CREATE INDEX idx_notification_rule_customer_profiles_rule ON notification_rule_customer_profiles(rule_id);
CREATE INDEX idx_notifications_recipient ON notifications(recipient_type, recipient_id);
CREATE INDEX idx_notifications_status ON notifications(status);
CREATE INDEX idx_notifications_created ON notifications(created_at DESC);
CREATE INDEX idx_notification_deliveries_notification ON notification_deliveries(notification_id);
CREATE INDEX idx_notification_deliveries_status ON notification_deliveries(status);