-- name: GetCoursesWithHierarchy :many
SELECT
    cc.id AS category_id,
    cc.name AS category_name,
    csc.id AS sub_category_id,
    csc.name AS sub_category_name,
    c.id AS course_id,
    c.title AS course_title
FROM course_categories cc
LEFT JOIN course_sub_categories csc ON csc.category_id = cc.id AND csc.is_active = TRUE
LEFT JOIN courses c ON c.sub_category_id = csc.id AND c.is_active = TRUE
WHERE cc.is_active = TRUE
ORDER BY cc.id, csc.display_order, csc.id, c.id;

-- name: GetLevelsByCourseID :many
SELECT *
FROM levels
WHERE course_id = $1
  AND is_active = TRUE
ORDER BY display_order ASC, id ASC;

-- name: GetModulesByLevelID :many
SELECT *
FROM modules
WHERE level_id = $1
  AND is_active = TRUE
ORDER BY display_order ASC, id ASC;

-- name: GetSubModulesByModuleID :many
SELECT *
FROM sub_modules
WHERE module_id = $1
  AND is_active = TRUE
ORDER BY display_order ASC, id ASC;

-- name: GetSubModuleVideos :many
SELECT *
FROM sub_module_videos
WHERE sub_module_id = $1
  AND status != 'ARCHIVED'
ORDER BY display_order ASC, id ASC;

-- name: GetSubModuleLessons :many
SELECT
    smp.id,
    smp.sub_module_id,
    smp.question_set_id,
    smp.intro_video_url,
    smp.display_order,
    smp.is_active,
    qs.title,
    qs.description,
    qs.status,
    qs.set_type,
    (SELECT COUNT(*) FROM question_set_items qsi WHERE qsi.set_id = qs.id) AS question_count
FROM sub_module_lessons smp
JOIN question_sets qs ON qs.id = smp.question_set_id
WHERE smp.sub_module_id = $1
  AND smp.is_active = TRUE
  AND qs.set_type = 'QUIZ'
ORDER BY smp.display_order ASC, smp.id ASC;

-- name: GetSubModulePractices :many
SELECT
    smp.id,
    smp.sub_module_id,
    smp.title,
    smp.description,
    smp.thumbnail,
    smp.intro_video_url,
    smp.question_set_id,
    smp.display_order,
    smp.is_active,
    qs.status,
    qs.set_type,
    (SELECT COUNT(*) FROM question_set_items qsi WHERE qsi.set_id = qs.id) AS question_count
FROM sub_module_practices smp
JOIN question_sets qs ON qs.id = smp.question_set_id
WHERE smp.sub_module_id = $1
  AND smp.is_active = TRUE
  AND qs.set_type = 'PRACTICE'
ORDER BY smp.display_order ASC, smp.id ASC;

-- name: GetFullHierarchyByCourseID :many
SELECT
    c.id AS course_id,
    c.title AS course_title,
    l.id AS level_id,
    l.cefr_level,
    m.id AS module_id,
    m.title AS module_title,
    sm.id AS sub_module_id,
    sm.title AS sub_module_title
FROM courses c
LEFT JOIN levels l ON l.course_id = c.id AND l.is_active = TRUE
LEFT JOIN modules m ON m.level_id = l.id AND m.is_active = TRUE
LEFT JOIN sub_modules sm ON sm.module_id = m.id AND sm.is_active = TRUE
WHERE c.id = $1
ORDER BY l.display_order, l.id, m.display_order, m.id, sm.display_order, sm.id;

-- name: CreateCourseSubCategory :one
INSERT INTO course_sub_categories (
    category_id,
    name,
    description,
    display_order,
    is_active
)
VALUES ($1, $2, $3, COALESCE($4, 0), COALESCE($5, TRUE))
RETURNING *;

-- name: CreateLevel :one
INSERT INTO levels (
    course_id,
    cefr_level,
    display_order,
    is_active
)
VALUES ($1, $2, COALESCE($3, 0), COALESCE($4, TRUE))
RETURNING *;

-- name: CreateModule :one
INSERT INTO modules (
    level_id,
    title,
    description,
    display_order,
    is_active
)
VALUES ($1, $2, $3, COALESCE($4, 0), COALESCE($5, TRUE))
RETURNING *;

-- name: CreateSubModule :one
INSERT INTO sub_modules (
    module_id,
    title,
    description,
    display_order,
    is_active
)
VALUES ($1, $2, $3, COALESCE($4, 0), COALESCE($5, TRUE))
RETURNING *;

-- name: CreateSubModuleVideo :one
INSERT INTO sub_module_videos (
    sub_module_id,
    title,
    description,
    video_url,
    duration,
    resolution,
    is_published,
    publish_date,
    visibility,
    instructor_id,
    thumbnail,
    display_order,
    status,
    vimeo_id,
    vimeo_embed_url,
    vimeo_player_html,
    vimeo_status,
    video_host_provider
)
VALUES (
    $1, $2, $3, $4, $5, $6,
    COALESCE($7, FALSE), $8, $9, $10, $11,
    COALESCE($12, 0), COALESCE($13, 'DRAFT'),
    $14, $15, $16, $17, COALESCE($18, 'DIRECT')
)
RETURNING *;

-- name: AttachQuestionSetLessonToSubModule :one
INSERT INTO sub_module_lessons (
    sub_module_id,
    question_set_id,
    intro_video_url,
    display_order,
    is_active
)
VALUES ($1, $2, $3, COALESCE($4, 0), COALESCE($5, TRUE))
RETURNING *;

-- name: CreateSubModulePractice :one
INSERT INTO sub_module_practices (
    sub_module_id,
    title,
    description,
    thumbnail,
    intro_video_url,
    question_set_id,
    display_order,
    is_active
)
VALUES ($1, $2, $3, $4, $5, $6, COALESCE($7, 0), COALESCE($8, TRUE))
RETURNING *;