-- Subscription Plans table
CREATE TABLE subscription_plans (
    id BIGSERIAL PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    description TEXT,
    duration_value INT NOT NULL,
    duration_unit VARCHAR(10) NOT NULL CHECK (duration_unit IN ('DAY', 'WEEK', 'MONTH', 'YEAR')),
    price DECIMAL(10, 2) NOT NULL,
    currency VARCHAR(3) NOT NULL DEFAULT 'ETB',
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMPTZ
);

CREATE INDEX idx_subscription_plans_active ON subscription_plans(is_active);

-- User Subscriptions table
CREATE TABLE user_subscriptions (
    id BIGSERIAL PRIMARY KEY,
    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    plan_id BIGINT NOT NULL REFERENCES subscription_plans(id) ON DELETE RESTRICT,
    starts_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    expires_at TIMESTAMPTZ NOT NULL,
    status VARCHAR(20) NOT NULL DEFAULT 'ACTIVE' CHECK (status IN ('PENDING', 'ACTIVE', 'EXPIRED', 'CANCELLED')),
    payment_reference VARCHAR(255),
    payment_method VARCHAR(50),
    auto_renew BOOLEAN NOT NULL DEFAULT FALSE,
    cancelled_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMPTZ
);

CREATE INDEX idx_user_subscriptions_user_id ON user_subscriptions(user_id);
CREATE INDEX idx_user_subscriptions_status ON user_subscriptions(status);
CREATE INDEX idx_user_subscriptions_expires_at ON user_subscriptions(expires_at);
CREATE INDEX idx_user_subscriptions_user_status ON user_subscriptions(user_id, status);