-- Generalise the two-slot kit designation (migration 0024) into the full set of
-- active club designations.
--
-- Ownership still lives ONLY in `owned_cards`; this table records which owned
-- INSTANCE currently occupies each club-scoped role. A row here is a pointer,
-- never a second ownership authority.
--
-- Lifecycle invariants enforced by the schema, not by convention:
--   * `PRIMARY KEY (club_id, slot)` — at most one active item per role.
--   * `owned_card_id ... UNIQUE` — one owned instance can occupy at most ONE
--     slot, so "the same card is both the home and the away kit" is unstorable.
--   * `REFERENCES owned_cards(id) ON DELETE CASCADE` — quick-selling/consuming
--     the item removes the designation, so a sold item can never be projected
--     back to the client as active.
--   * the BEFORE UPDATE trigger below — a market transfer moves ownership by
--     UPDATE (the row id survives), which no FK action can see, so the
--     designation is dropped explicitly before the owner changes.
--
-- `squad_managers` (migration 0023) is squad-scoped, not club-scoped, and is
-- deliberately NOT folded in here.
CREATE TABLE IF NOT EXISTS club_active_items (
    club_id       TEXT NOT NULL REFERENCES clubs(id) ON DELETE CASCADE,
    slot          TEXT NOT NULL CHECK (slot IN (
                      'home_kit', 'away_kit', 'badge', 'ball', 'stadium'
                  )),
    owned_card_id TEXT NOT NULL UNIQUE REFERENCES owned_cards(id) ON DELETE CASCADE,
    updated_at    TEXT NOT NULL,
    PRIMARY KEY (club_id, slot)
);

CREATE INDEX IF NOT EXISTS idx_club_active_items_owned
    ON club_active_items(owned_card_id);

-- Carry every existing kit designation over: 'home' -> 'home_kit',
-- 'away' -> 'away_kit'. No designation is lost and none is invented.
INSERT INTO club_active_items (club_id, slot, owned_card_id, updated_at)
SELECT club_id,
       CASE slot WHEN 'home' THEN 'home_kit' ELSE 'away_kit' END,
       owned_card_id,
       updated_at
FROM club_kit_assignments
WHERE slot IN ('home', 'away');

-- 0024's trigger lives ON owned_cards, so DROP TABLE would NOT remove it and
-- every subsequent ownership transfer would fail on a missing table. Drop it
-- explicitly first, then replace it with the generalised one.
DROP TRIGGER IF EXISTS clear_club_kit_assignment_before_transfer;
DROP TABLE club_kit_assignments;

CREATE TRIGGER IF NOT EXISTS clear_club_active_item_before_transfer
BEFORE UPDATE OF club_id ON owned_cards
WHEN OLD.club_id <> NEW.club_id
BEGIN
    DELETE FROM club_active_items WHERE owned_card_id = OLD.id;
END;