-- 006: Coupons table (issuer-service)
CREATE TABLE IF NOT EXISTS coupons (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    chain_token_id BIGINT UNIQUE,
    issuer_id UUID NOT NULL REFERENCES issuers(id),
    name VARCHAR(200) NOT NULL,
    description TEXT,
    image_url VARCHAR(500),
    face_value NUMERIC(12,2) NOT NULL CHECK (face_value > 0),
    current_price NUMERIC(12,2),
    issue_price NUMERIC(12,2),
    total_supply INTEGER NOT NULL DEFAULT 1,
    remaining_supply INTEGER NOT NULL DEFAULT 1,
    expiry_date DATE NOT NULL,
    coupon_type VARCHAR(10) NOT NULL DEFAULT 'utility' CHECK (coupon_type IN ('utility', 'security')),
    category VARCHAR(50),
    status VARCHAR(20) NOT NULL DEFAULT 'minted' CHECK (status IN ('minted', 'listed', 'sold', 'in_circulation', 'redeemed', 'expired', 'recalled')),
    owner_user_id UUID REFERENCES users(id),
    resale_count SMALLINT NOT NULL DEFAULT 0,
    max_resale_count SMALLINT NOT NULL DEFAULT 3,
    is_transferable BOOLEAN NOT NULL DEFAULT true,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_coupons_issuer_id ON coupons(issuer_id);
CREATE INDEX idx_coupons_status ON coupons(status);
CREATE INDEX idx_coupons_coupon_type ON coupons(coupon_type);
CREATE INDEX idx_coupons_category ON coupons(category);
CREATE INDEX idx_coupons_owner_user_id ON coupons(owner_user_id);
CREATE INDEX idx_coupons_expiry_date ON coupons(expiry_date);
CREATE INDEX idx_coupons_name_trgm ON coupons USING gin (name gin_trgm_ops);