-- +goose Up
-- +goose StatementBegin
CREATE TABLE IF NOT EXISTS tests
(
    id          serial               NOT NULL,
    problem_id  INT                  NOT NULL,

    PRIMARY KEY (id),
);

CREATE INDEX ON users USING B-TREE (id);
CREATE INDEX ON users USING B-TREE (problem_id);




CREATE TABLE IF NOT EXISTS languages
(
    id                 serial               NOT NULL,
    name               VARCHAR(60)          NOT NULL,
    build_file_hash    CHAR(128)            NOT NULL,
    execute_file_hash  CHAR(128)            NOT NULL,
    created_at         TIMESTAMPTZ          NOT NULL DEFAULT NOW(),
    updated_at         TIMESTAMPTZ          NOT NULL DEFAULT NOW(),

    PRIMARY KEY (id),
);


CREATE FUNCTION lng_upd_trg_fn() RETURNS TRIGGER
    LANGUAGE plpgsql AS
$$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$;

CREATE TRIGGER lng_upd_trg
    BEFORE UPDATE
    ON languages
    FOR EACH ROW
EXECUTE PROCEDURE lng_upd_trg_fn();



CREATE TABLE IF NOT EXISTS solutions
(
    id            serial               NOT NULL,
    user_id       INT                  REFERENCES users ON DELETE CASCADE,
    problem_id    INT                  REFERENCES problems ON DELETE CASCADE,
    language_id   INT                  REFERENCES languages ON DELETE CASCADE,
    contest_id    INT                  NOT NULL,
    solution_hash CHAR(128)            NOT NULL,
    created_at    TIMESTAMPTZ          NOT NULL DEFAULT NOW(),

    PRIMARY KEY (id),
    CHECK (length(name) != 0),
    CHECK (length(description) != 0)
);

CREATE INDEX ON users USING B-TREE (id);
CREATE INDEX ON users USING B-TREE (id,user_id,problem_id,language_id);

-- +goose StatementEnd

-- +goose Down
DROP TABLE IF EXISTS tests;
DROP TABLE IF EXISTS solutions;