-- name: CreateModule :one
INSERT INTO modules (program_id, course_id, name, description, icon, sort_order)
SELECT
    $1,
    $2,
    $3,
    $4,
    $5,
    coalesce((
        SELECT
            max(m.sort_order)
        FROM modules m
        WHERE
            m.course_id = $2), 0) + 1
RETURNING
    *;

-- name: GetModuleByID :one
SELECT
    m.*,
    EXISTS (
        SELECT 1
        FROM lms_practices p
        WHERE p.module_id = m.id
          AND p.lesson_id IS NULL
    ) AS has_practice
FROM modules
    m
WHERE m.id = $1;

-- name: ListModuleIDsByCourse :many
SELECT
    m.id
FROM
    modules AS m
WHERE
    m.course_id = $1
ORDER BY
    m.id;

-- name: ListModulesByProgramAndCourse :many
SELECT
    COUNT(*) OVER () AS total_count,
    m.id,
    m.program_id,
    m.course_id,
    m.name,
    m.description,
    m.icon,
    m.sort_order,
    m.created_at,
    m.updated_at,
    EXISTS (
        SELECT 1
        FROM lms_practices p
        WHERE p.module_id = m.id
          AND p.lesson_id IS NULL
    ) AS has_practice
FROM
    modules m
WHERE
    m.program_id = $1
    AND m.course_id = $2
ORDER BY
    m.sort_order ASC,
    m.id ASC
LIMIT $3
OFFSET $4;

-- name: UpdateModule :one
UPDATE modules
SET
    name = COALESCE(sqlc.narg('name')::varchar, name),
    description = COALESCE(sqlc.narg('description')::text, description),
    icon = COALESCE(sqlc.narg('icon')::text, icon),
    sort_order = coalesce(sqlc.narg('sort_order')::int, sort_order),
    updated_at = CURRENT_TIMESTAMP
WHERE
    id = sqlc.arg('id')
RETURNING
    *;

-- name: DeleteModule :exec
DELETE FROM modules
WHERE id = $1;