-- 003_discount_codes.sql
-- Discount and referral code system.
-- Supports percentage and flat discounts, usage limits, expiration,
-- referral partner tracking, and per-service or global application.

BEGIN;

-- Discount / referral codes
CREATE TABLE IF NOT EXISTS discount_codes (
    id                  SERIAL PRIMARY KEY,
    code                TEXT NOT NULL UNIQUE,           -- e.g. 'SAVE20', 'PARTNER-ACME', 'REDDIT10'
    description         TEXT,                           -- internal note

    -- Discount type: 'percent' or 'flat'
    discount_type       TEXT NOT NULL CHECK (discount_type IN ('percent', 'flat')),
    discount_value      INTEGER NOT NULL,               -- percent (0-100) or flat amount in cents
    -- e.g. percent=20 means 20% off service fee; flat=10000 means $100 off total

    -- Scope: which services does this code apply to?
    -- NULL = all services; otherwise comma-separated slugs
    applies_to          TEXT DEFAULT NULL,               -- NULL=all, or 'formation,llc,corporation'

    -- Referral partner info (for payout tracking)
    referral_partner    TEXT,                            -- partner name or ID
    referral_email      TEXT,                            -- partner payout email
    referral_pct        INTEGER DEFAULT 0,              -- % of service fee paid to partner (0-100)

    -- Limits
    max_uses            INTEGER DEFAULT NULL,           -- NULL = unlimited
    max_uses_per_email  INTEGER DEFAULT 1,              -- per customer email
    current_uses        INTEGER DEFAULT 0,

    -- Validity
    active              BOOLEAN DEFAULT TRUE,
    starts_at           TIMESTAMPTZ DEFAULT now(),
    expires_at          TIMESTAMPTZ DEFAULT NULL,       -- NULL = never expires

    -- Metadata
    created_at          TIMESTAMPTZ DEFAULT now(),
    updated_at          TIMESTAMPTZ DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_discount_codes_code ON discount_codes(code);
CREATE INDEX IF NOT EXISTS idx_discount_codes_partner ON discount_codes(referral_partner);

-- Usage log: track every time a code is used
CREATE TABLE IF NOT EXISTS discount_usage (
    id                  SERIAL PRIMARY KEY,
    discount_code_id    INTEGER NOT NULL REFERENCES discount_codes(id),
    code                TEXT NOT NULL,
    order_type          TEXT NOT NULL,                   -- 'formation', 'service', 'quote'
    order_id            INTEGER,                         -- FK to formation_orders.id or orders.id
    customer_email      TEXT NOT NULL,
    discount_amount     INTEGER NOT NULL,                -- actual discount applied in cents
    referral_payout     INTEGER DEFAULT 0,               -- amount owed to referral partner in cents
    ip_address          TEXT,
    created_at          TIMESTAMPTZ DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_discount_usage_code ON discount_usage(code);
CREATE INDEX IF NOT EXISTS idx_discount_usage_email ON discount_usage(customer_email);
CREATE INDEX IF NOT EXISTS idx_discount_usage_partner ON discount_usage(discount_code_id);

-- Seed some example codes
INSERT INTO discount_codes (code, description, discount_type, discount_value, applies_to, max_uses, active) VALUES
    ('LAUNCH25', 'Launch promotion — 25% off service fee', 'percent', 25, NULL, 100, TRUE),
    ('FIRST50', 'First-time customer — $50 off', 'flat', 5000, NULL, NULL, TRUE),
    ('FORMATION100', '$100 off business formation', 'flat', 10000, 'formation', NULL, TRUE),
    ('REDDIT10', 'Reddit community — 10% off', 'percent', 10, NULL, NULL, TRUE)
ON CONFLICT (code) DO NOTHING;

-- Example referral partner code
INSERT INTO discount_codes (code, description, discount_type, discount_value, referral_partner, referral_email, referral_pct, max_uses, active) VALUES
    ('REF-EXAMPLE', 'Example referral partner', 'percent', 15, 'Example CPA Firm', 'partner@example.com', 20, NULL, TRUE)
ON CONFLICT (code) DO NOTHING;

COMMIT;