-- Gateway sessions: one row per signed-in TV.
--
-- token_hash is SHA-256 of the bearer token handed to the device, so a database dump
-- does not hand over working gateway tokens. emby_token IS the live upstream token and
-- is stored as-is: treat this volume as a secret store.
CREATE TABLE IF NOT EXISTS sessions (
    token_hash   BYTEA PRIMARY KEY,
    emby_user_id TEXT        NOT NULL,
    emby_token   TEXT        NOT NULL,
    username     TEXT        NOT NULL,
    server_id    TEXT        NOT NULL DEFAULT '',
    device_id    TEXT        NOT NULL DEFAULT '',
    device_name  TEXT        NOT NULL DEFAULT 'Memby TV',
    created_at   TIMESTAMPTZ NOT NULL DEFAULT now(),
    last_seen_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

ALTER TABLE sessions ADD COLUMN IF NOT EXISTS device_name TEXT NOT NULL DEFAULT 'Memby TV';

-- Older builds could create more than one token for the same physical TV. Keep the most
-- recently used row before adding the identity constraint.
DELETE FROM sessions older
USING sessions newer
WHERE older.emby_user_id = newer.emby_user_id
  AND older.device_id = newer.device_id
  AND (
      older.last_seen_at < newer.last_seen_at
      OR (older.last_seen_at = newer.last_seen_at AND older.token_hash < newer.token_hash)
  );

CREATE INDEX IF NOT EXISTS sessions_emby_user_idx ON sessions (emby_user_id);
CREATE INDEX IF NOT EXISTS sessions_last_seen_idx ON sessions (last_seen_at);
CREATE UNIQUE INDEX IF NOT EXISTS sessions_user_device_idx
    ON sessions (emby_user_id, device_id);

-- The imported library.
--
-- payload is Emby's item JSON verbatim, so rows served from here are byte-identical to
-- rows served live. Deliberately holds NO per-user state: everything is imported with
-- EnableUserData=false, because one household shares this table and watched/favourite
-- flags are not shareable. Anything user-specific still comes from Emby live.
CREATE TABLE IF NOT EXISTS library_items (
    id               TEXT PRIMARY KEY,
    type             TEXT        NOT NULL DEFAULT '',
    name             TEXT        NOT NULL DEFAULT '',
    series_id        TEXT        NOT NULL DEFAULT '',
    series_name      TEXT        NOT NULL DEFAULT '',
    production_year  INT,
    community_rating REAL,
    genres           TEXT[]      NOT NULL DEFAULT '{}',
    studios          TEXT[]      NOT NULL DEFAULT '{}',
    date_created     TIMESTAMPTZ,
    search_text      TEXT        NOT NULL DEFAULT '',
    payload          JSONB       NOT NULL,
    synced_at        TIMESTAMPTZ NOT NULL DEFAULT now(),
    -- 'simple' rather than 'english': film titles are proper nouns, and stemming
    -- "Arrival" into "arriv" helps nobody.
    search_tsv       tsvector GENERATED ALWAYS AS (to_tsvector('simple', search_text)) STORED
);

CREATE INDEX IF NOT EXISTS library_items_search_idx ON library_items USING GIN (search_tsv);
CREATE INDEX IF NOT EXISTS library_items_genres_idx ON library_items USING GIN (genres);
CREATE INDEX IF NOT EXISTS library_items_type_created_idx ON library_items (type, date_created DESC);
CREATE INDEX IF NOT EXISTS library_items_synced_idx ON library_items (synced_at);

-- One row per import, so the admin page can show what happened and when.
CREATE TABLE IF NOT EXISTS sync_runs (
    id             BIGSERIAL PRIMARY KEY,
    kind           TEXT        NOT NULL,                    -- full | incremental
    trigger        TEXT        NOT NULL DEFAULT 'schedule', -- schedule | manual | startup
    status         TEXT        NOT NULL,                    -- running | success | failed
    started_at     TIMESTAMPTZ NOT NULL DEFAULT now(),
    finished_at    TIMESTAMPTZ,
    items_seen     INT         NOT NULL DEFAULT 0,
    items_upserted INT         NOT NULL DEFAULT 0,
    items_removed  INT         NOT NULL DEFAULT 0,
    error          TEXT        NOT NULL DEFAULT ''
);

CREATE INDEX IF NOT EXISTS sync_runs_started_idx ON sync_runs (started_at DESC);

-- Small key/value store for operator switches (currently just maintenance mode). Kept in
-- Postgres rather than memory so a restart cannot silently bring the app back up.
CREATE TABLE IF NOT EXISTS app_settings (
    key        TEXT PRIMARY KEY,
    value      JSONB       NOT NULL,
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Row-level engagement. One row per reported event; aggregation happens at read time,
-- which is fine at household scale and keeps the write path trivial.
CREATE TABLE IF NOT EXISTS row_events (
    id           BIGSERIAL PRIMARY KEY,
    occurred_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
    emby_user_id TEXT        NOT NULL,
    row_id       TEXT        NOT NULL,
    row_kind     TEXT        NOT NULL DEFAULT '',
    event        TEXT        NOT NULL,                -- impression | focus | select
    item_id      TEXT        NOT NULL DEFAULT '',
    dwell_ms     INT         NOT NULL DEFAULT 0
);

CREATE INDEX IF NOT EXISTS row_events_time_idx ON row_events (occurred_at DESC);
CREATE INDEX IF NOT EXISTS row_events_row_idx ON row_events (row_id, occurred_at DESC);