-- Phase 2: topic-based wantlists + items
-- A "list" is a topic (clothes, gear, …). An "item" is a thing the user covets,
-- usually backed by a pasted product URL. Price/metadata columns are filled by the
-- Phase 3 refetch worker (generic Shopify .json adapter, etc.) and stay NULL until then.

CREATE TABLE lists (
    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id     UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    name        TEXT NOT NULL,
    emoji       TEXT,                       -- optional decorative glyph
    description TEXT,
    position    INTEGER NOT NULL DEFAULT 0, -- manual ordering
    created_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX idx_lists_user ON lists(user_id);

CREATE TYPE item_status AS ENUM ('coveted', 'acquired', 'renounced');

CREATE TABLE items (
    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    list_id       UUID NOT NULL REFERENCES lists(id) ON DELETE CASCADE,
    title         TEXT NOT NULL,
    url           TEXT,                         -- pasted product URL (Phase 3 tracks this)
    note          TEXT,
    status        item_status NOT NULL DEFAULT 'coveted',
    target_price  NUMERIC(12, 2),               -- alert threshold the user sets
    position      INTEGER NOT NULL DEFAULT 0,

    -- Filled by the Phase 3 fetcher; NULL until first successful fetch.
    title_fetched TEXT,
    current_price NUMERIC(12, 2),
    currency      TEXT,                         -- ISO 4217, e.g. 'EUR'
    image_url     TEXT,
    in_stock      BOOLEAN,
    source        TEXT,                         -- adapter that produced the data, e.g. 'shopify'
    fetched_at    TIMESTAMPTZ,

    created_at    TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at    TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX idx_items_list ON items(list_id);
CREATE INDEX idx_items_url ON items(url) WHERE url IS NOT NULL;

CREATE TRIGGER trg_lists_updated
    BEFORE UPDATE ON lists
    FOR EACH ROW EXECUTE FUNCTION set_updated_at();

CREATE TRIGGER trg_items_updated
    BEFORE UPDATE ON items
    FOR EACH ROW EXECUTE FUNCTION set_updated_at();