-- ============================================================
-- v3.4 MercadoLibre Integration
-- ============================================================
-- Adds tables for external marketplace listings, orders,
-- order items, and a generic sync queue.
-- All tables live in the tenant DB.
-- ============================================================

-- Listings published on MercadoLibre (extensible to Amazon later)
CREATE TABLE IF NOT EXISTS marketplace_listings (
    id                  SERIAL PRIMARY KEY,
    inventory_id        INTEGER REFERENCES inventory(id),
    channel             VARCHAR(20) NOT NULL DEFAULT 'mercadolibre',
    external_item_id    VARCHAR(50) NOT NULL,
    external_status     VARCHAR(30) DEFAULT 'active',
    external_permalink  TEXT,
    title               TEXT,
    meli_category_id    VARCHAR(30),
    publish_price       NUMERIC(12,2),
    last_sync_at        TIMESTAMPTZ,
    sync_errors         TEXT,
    is_active           BOOLEAN DEFAULT true,
    created_at          TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_marketplace_listings_inventory
    ON marketplace_listings(inventory_id);
CREATE INDEX IF NOT EXISTS idx_marketplace_listings_external
    ON marketplace_listings(external_item_id);
CREATE UNIQUE INDEX IF NOT EXISTS idx_marketplace_listings_unique
    ON marketplace_listings(inventory_id, channel) WHERE is_active = true;

-- Orders received from MercadoLibre
CREATE TABLE IF NOT EXISTS marketplace_orders (
    id                  SERIAL PRIMARY KEY,
    channel             VARCHAR(20) NOT NULL DEFAULT 'mercadolibre',
    external_order_id   VARCHAR(50) NOT NULL UNIQUE,
    external_status     VARCHAR(30) NOT NULL,
    buyer_name          VARCHAR(200),
    buyer_email         VARCHAR(200),
    buyer_phone         VARCHAR(50),
    buyer_nickname      VARCHAR(100),
    shipping_address    JSONB,
    total_amount        NUMERIC(12,2),
    shipping_cost       NUMERIC(12,2),
    meli_shipping_id    VARCHAR(50),
    nexus_sale_id       INTEGER REFERENCES sales(id),
    status              VARCHAR(20) DEFAULT 'pending',
    notes               TEXT,
    raw_json            JSONB,
    created_at          TIMESTAMPTZ DEFAULT NOW(),
    updated_at          TIMESTAMPTZ DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_marketplace_orders_status
    ON marketplace_orders(status);
CREATE INDEX IF NOT EXISTS idx_marketplace_orders_external
    ON marketplace_orders(external_order_id);

-- Items inside a marketplace order
CREATE TABLE IF NOT EXISTS marketplace_order_items (
    id                      SERIAL PRIMARY KEY,
    marketplace_order_id    INTEGER REFERENCES marketplace_orders(id) ON DELETE CASCADE,
    inventory_id            INTEGER REFERENCES inventory(id),
    external_item_id        VARCHAR(50),
    title                   VARCHAR(300),
    quantity                INTEGER NOT NULL,
    unit_price              NUMERIC(12,2),
    total_price             NUMERIC(12,2),
    listing_id              INTEGER REFERENCES marketplace_listings(id)
);

-- Generic sync queue (reusable for future Amazon integration)
CREATE TABLE IF NOT EXISTS marketplace_sync_queue (
    id              SERIAL PRIMARY KEY,
    inventory_id    INTEGER REFERENCES inventory(id),
    channel         VARCHAR(20) NOT NULL,
    action          VARCHAR(20) NOT NULL,
    status          VARCHAR(20) DEFAULT 'pending',
    payload         JSONB,
    error_message   TEXT,
    retry_count     INT DEFAULT 0,
    created_at      TIMESTAMPTZ DEFAULT NOW(),
    processed_at    TIMESTAMPTZ
);

CREATE INDEX IF NOT EXISTS idx_marketplace_sync_queue_pending
    ON marketplace_sync_queue(status, channel) WHERE status = 'pending';

-- Add source column to sales to track origin (POS, ML, Amazon, etc.)
-- If the column already exists from another migration, do nothing.
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'sales' AND column_name = 'source'
    ) THEN
        ALTER TABLE sales ADD COLUMN source VARCHAR(30) DEFAULT 'pos';
    END IF;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'sales' AND column_name = 'external_order_id'
    ) THEN
        ALTER TABLE sales ADD COLUMN external_order_id VARCHAR(50);
    END IF;
END $$;