-- Sādhana streak rewards.
--
-- `sadhna_rewards` is the catalog of gift items (one row per reward),
-- seeded/synced at BFF startup from the embedded rewards.json so the
-- name / meaning / image_url stay in lockstep with the source of truth.
--
-- `sadhna_reward_grants` records which reward a user earned at which
-- streak milestone (a multiple of 7 days). The UNIQUE (user_id, milestone)
-- makes granting idempotent — a milestone hands out exactly one gift no
-- matter how often the dashboard is recomputed. `celebrated_at` is NULL
-- until the client has shown the confetti celebration, so a freshly earned
-- gift surfaces exactly once.
CREATE TABLE IF NOT EXISTS sadhna_rewards (
    id         UUID         PRIMARY KEY DEFAULT gen_random_uuid(),
    key        TEXT         NOT NULL UNIQUE,
    name       TEXT         NOT NULL,
    meaning    TEXT         NOT NULL DEFAULT '',
    image_url  TEXT         NOT NULL DEFAULT '',
    active     BOOLEAN      NOT NULL DEFAULT TRUE,
    sort       INTEGER      NOT NULL DEFAULT 0,
    created_at TIMESTAMPTZ  NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ  NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS sadhna_reward_grants (
    id            UUID         PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id       UUID         NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    reward_id     UUID         NOT NULL REFERENCES sadhna_rewards(id) ON DELETE CASCADE,
    milestone     INTEGER      NOT NULL,
    granted_at    TIMESTAMPTZ  NOT NULL DEFAULT now(),
    celebrated_at TIMESTAMPTZ,
    UNIQUE (user_id, milestone)
);

CREATE INDEX IF NOT EXISTS sadhna_reward_grants_user_idx
    ON sadhna_reward_grants (user_id, granted_at DESC);