-- #73. movies.state used missing|grabbed|imported, predating arr-core's
-- canonical MediaState vocabulary (missing|downloading|available) that
-- series/episodes (0005) already follow.
--
-- SQLite can't ALTER a CHECK constraint, so this rebuilds the table -- which
-- means dropping the old copy. `movie_releases` references it with
-- ON DELETE CASCADE, so the drop would take its rows down too; stash them
-- first and restore them once the new `movies` exists with the same ids.

CREATE TABLE movie_releases_backup AS SELECT * FROM movie_releases;

CREATE TABLE movies_new (
    id                INTEGER PRIMARY KEY,
    tmdb_id           INTEGER NOT NULL UNIQUE,
    title             TEXT NOT NULL,
    year              INTEGER,
    original_language TEXT,
    root_id           INTEGER NOT NULL REFERENCES roots (id),
    wanted            INTEGER NOT NULL DEFAULT 1 CHECK (wanted IN (0, 1)),
    overrides         TEXT NOT NULL DEFAULT '{}' CHECK (json_valid(overrides)),
    state             TEXT NOT NULL DEFAULT 'missing'
                      CHECK (state IN ('missing', 'downloading', 'available')),
    blocked           INTEGER NOT NULL DEFAULT 0 CHECK (blocked IN (0, 1)),
    search_attempts   INTEGER NOT NULL DEFAULT 0,
    last_searched_at  TEXT,
    created_at        TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
    updated_at        TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
) STRICT;

INSERT INTO movies_new (
    id, tmdb_id, title, year, original_language, root_id, wanted, overrides,
    state, blocked, search_attempts, last_searched_at, created_at, updated_at
)
SELECT
    id, tmdb_id, title, year, original_language, root_id, wanted, overrides,
    CASE state
        WHEN 'grabbed'  THEN 'downloading'
        WHEN 'imported' THEN 'available'
        ELSE state
    END,
    blocked, search_attempts, last_searched_at, created_at, updated_at
FROM movies;

DROP TABLE movies;

ALTER TABLE movies_new RENAME TO movies;

CREATE INDEX movies_pending_search
    ON movies (last_searched_at)
    WHERE wanted = 1 AND blocked = 0;

CREATE INDEX movies_state ON movies (state);
CREATE INDEX movies_root ON movies (root_id);

-- Dropping `movies` drops the triggers defined on it too (0005); recreate
-- the movie-root invariant they enforced.
CREATE TRIGGER movies_require_movie_root
BEFORE INSERT ON movies
WHEN EXISTS (SELECT 1 FROM roots WHERE id = NEW.root_id AND kind != 'movie')
BEGIN
    SELECT RAISE(ABORT, 'movies require a movie root');
END;

CREATE TRIGGER movies_require_movie_root_on_update
BEFORE UPDATE OF root_id ON movies
WHEN EXISTS (SELECT 1 FROM roots WHERE id = NEW.root_id AND kind != 'movie')
BEGIN
    SELECT RAISE(ABORT, 'movies require a movie root');
END;

INSERT INTO movie_releases SELECT * FROM movie_releases_backup;

DROP TABLE movie_releases_backup;