-- ═══════════════════════════════════════════════════════════════════════════
-- v4.27 — Yonke M1: used-parts (parts-usadas) data model
-- Additive + idempotent. Runs against tenant DBs.
--
-- Enables businesses that sell ONLY used parts (yonkes/deshuesaderos):
--   * condition (nuevo/usado/reconstruido) + grade (A/B/C/D)
--   * unique 1-of-1 pieces (is_unique_piece) with a donor vehicle
--   * multiple photos per item (inventory_images)
--   * ownership (propio/consigna) + consignment tables
--   * warranty expressed in days (for used parts)
-- ═══════════════════════════════════════════════════════════════════════════

-- ─── 1. inventory: condition / donor / ownership / unique-piece columns ─────
ALTER TABLE inventory
    ADD COLUMN IF NOT EXISTS condition           VARCHAR(20) DEFAULT 'nuevo',
    ADD COLUMN IF NOT EXISTS condition_grade     VARCHAR(2),
    ADD COLUMN IF NOT EXISTS is_unique_piece     BOOLEAN     DEFAULT FALSE,
    ADD COLUMN IF NOT EXISTS serial_number       VARCHAR(100),
    ADD COLUMN IF NOT EXISTS donor_vin           VARCHAR(20),
    ADD COLUMN IF NOT EXISTS donor_make          VARCHAR(60),
    ADD COLUMN IF NOT EXISTS donor_model         VARCHAR(60),
    ADD COLUMN IF NOT EXISTS donor_year          INTEGER,
    ADD COLUMN IF NOT EXISTS donor_mileage_km    INTEGER,
    ADD COLUMN IF NOT EXISTS ownership           VARCHAR(20) DEFAULT 'propio',
    ADD COLUMN IF NOT EXISTS acquisition_cost    NUMERIC(12,2);

-- CHECK constraints (guarded so re-runs are safe)
DO $$
BEGIN
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'inventory_condition_chk') THEN
        ALTER TABLE inventory ADD CONSTRAINT inventory_condition_chk
            CHECK (condition IS NULL OR condition IN ('nuevo','usado','reconstruido'));
    END IF;
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'inventory_ownership_chk') THEN
        ALTER TABLE inventory ADD CONSTRAINT inventory_ownership_chk
            CHECK (ownership IS NULL OR ownership IN ('propio','consigna'));
    END IF;
    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'inventory_grade_chk') THEN
        ALTER TABLE inventory ADD CONSTRAINT inventory_grade_chk
            CHECK (condition_grade IS NULL OR condition_grade IN ('A','B','C','D'));
    END IF;
END $$;

CREATE INDEX IF NOT EXISTS idx_inventory_condition
    ON inventory(condition);
CREATE INDEX IF NOT EXISTS idx_inventory_donor_vin
    ON inventory(donor_vin) WHERE donor_vin IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_inventory_donor_vehicle
    ON inventory(donor_make, donor_model, donor_year) WHERE is_unique_piece;

-- ─── 2. Relax part_number NOT NULL so codeless unique pieces can exist ──────
-- A standard UNIQUE index in PostgreSQL already treats NULLs as distinct, so
-- the existing full unique index (idx_inventory_part_unique) keeps enforcing
-- uniqueness on non-null codes while allowing many NULLs. We deliberately do
-- NOT turn it into a partial index: that would break `ON CONFLICT (part_number)`
-- used by the importers.
ALTER TABLE inventory ALTER COLUMN part_number DROP NOT NULL;

-- ─── 3. inventory_images: multiple photos per item ─────────────────────────
CREATE TABLE IF NOT EXISTS inventory_images (
    id            SERIAL PRIMARY KEY,
    inventory_id  INTEGER NOT NULL REFERENCES inventory(id) ON DELETE CASCADE,
    url           VARCHAR(500) NOT NULL,
    sort_order    INTEGER NOT NULL DEFAULT 0,
    is_primary    BOOLEAN NOT NULL DEFAULT FALSE,
    created_at    TIMESTAMPTZ DEFAULT NOW()
);
CREATE INDEX IF NOT EXISTS idx_inventory_images_inv
    ON inventory_images(inventory_id, sort_order);
CREATE UNIQUE INDEX IF NOT EXISTS idx_inventory_images_primary
    ON inventory_images(inventory_id) WHERE is_primary;

-- Migrate the existing single image_url into the new table (first photo).
INSERT INTO inventory_images (inventory_id, url, sort_order, is_primary)
SELECT i.id, i.image_url, 0, TRUE
FROM inventory i
WHERE i.image_url IS NOT NULL AND i.image_url <> ''
  AND NOT EXISTS (SELECT 1 FROM inventory_images ii WHERE ii.inventory_id = i.id);

-- ─── 4. warranties: express warranty in days (used parts) ──────────────────
DO $$
BEGIN
    IF to_regclass('public.warranties') IS NOT NULL THEN
        EXECUTE 'ALTER TABLE warranties ADD COLUMN IF NOT EXISTS warranty_days INTEGER';
    END IF;
END $$;

-- ─── 5. Consignments (third-party parts held for sale) ─────────────────────
CREATE TABLE IF NOT EXISTS consignments (
    id               SERIAL PRIMARY KEY,
    consignor_name   VARCHAR(200) NOT NULL,
    consignor_rfc    VARCHAR(13),
    consignor_phone  VARCHAR(30),
    commission_pct   NUMERIC(5,2) DEFAULT 0,
    status           VARCHAR(20) NOT NULL DEFAULT 'open',   -- open | closed | settled
    notes            TEXT,
    created_at       TIMESTAMPTZ DEFAULT NOW(),
    updated_at       TIMESTAMPTZ DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS consignment_items (
    id                SERIAL PRIMARY KEY,
    consignment_id    INTEGER NOT NULL REFERENCES consignments(id) ON DELETE CASCADE,
    inventory_id      INTEGER REFERENCES inventory(id) ON DELETE SET NULL,
    agreed_price      NUMERIC(12,2),
    commission_amount NUMERIC(12,2),
    status            VARCHAR(20) NOT NULL DEFAULT 'in_stock',  -- in_stock | sold | returned | settled
    created_at        TIMESTAMPTZ DEFAULT NOW()
);
CREATE INDEX IF NOT EXISTS idx_consignment_items_cons
    ON consignment_items(consignment_id);
CREATE INDEX IF NOT EXISTS idx_consignment_items_inv
    ON consignment_items(inventory_id);