-- ==============================================================================
-- SAQEL PLATFORM (منصة صَقِل) - PRIMARY DATABASE SCHEMA (MySQL 8.4+)
-- Complete Production Database Definition
-- ==============================================================================

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ------------------------------------------------------------------------------
-- DROP ALL EXISTING TABLES IN REVERSE ORDER TO PREVENT FOREIGN KEY CONFLICTS
-- ------------------------------------------------------------------------------
DROP TABLE IF EXISTS `otp_verifications`;
DROP TABLE IF EXISTS `user_devices`;
DROP TABLE IF EXISTS `voice_notes`;
DROP TABLE IF EXISTS `lesson_progress`;
DROP TABLE IF EXISTS `progress`;
DROP TABLE IF EXISTS `question_options`;
DROP TABLE IF EXISTS `questions`;
DROP TABLE IF EXISTS `quizzes`;
DROP TABLE IF EXISTS `lessons`;
DROP TABLE IF EXISTS `courses`;
DROP TABLE IF EXISTS `subjects`;
DROP TABLE IF EXISTS `teacher_profiles`;
DROP TABLE IF EXISTS `guardian_student`;
DROP TABLE IF EXISTS `users`;
DROP TABLE IF EXISTS `schools`;

-- ------------------------------------------------------------------------------
-- 1. Table: schools (المدارس والجهات الشريكة - B2B مثل الثقافة العسكرية)
-- ------------------------------------------------------------------------------
CREATE TABLE `schools` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `uuid` CHAR(36) NOT NULL,
  `name` VARCHAR(255) NOT NULL,
  `code` VARCHAR(50) NOT NULL UNIQUE,
  `type` ENUM('military_culture', 'private', 'public', 'center') NOT NULL DEFAULT 'private',
  `director_name` VARCHAR(255) DEFAULT NULL,
  `phone` VARCHAR(50) DEFAULT NULL,
  `city` VARCHAR(100) DEFAULT 'Amman',
  `is_active` TINYINT(1) NOT NULL DEFAULT 1,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_schools_uuid` (`uuid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 2. Table: users (المستخدمون الموحدون - طلاب، معلمون، أولياء أمور، إدارة)
-- ------------------------------------------------------------------------------
CREATE TABLE `users` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `uuid` CHAR(36) NOT NULL,
  `full_name` TEXT NOT NULL,
  `phone_number` TEXT NOT NULL,
  `phone_hash` VARCHAR(64) NOT NULL,
  `password_hash` VARCHAR(255) DEFAULT NULL,
  `role` ENUM('student', 'guardian', 'teacher', 'school_admin', 'super_admin') NOT NULL DEFAULT 'student',
  `school_id` BIGINT UNSIGNED DEFAULT NULL,
  `grade_level` VARCHAR(50) DEFAULT 'tawjihi_2007',
  `stream` ENUM('scientific', 'literary', 'vocational', 'general') DEFAULT 'scientific',
  `token_version` INT UNSIGNED NOT NULL DEFAULT 1,
  `status` ENUM('active', 'pending_otp', 'suspended') NOT NULL DEFAULT 'pending_otp',
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_users_uuid` (`uuid`),
  KEY `idx_users_phone_hash` (`phone_hash`),
  KEY `idx_users_school_id` (`school_id`),
  CONSTRAINT `fk_users_school` FOREIGN KEY (`school_id`) REFERENCES `schools` (`id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 3. Table: guardian_student (ربط أولياء الأمور بالأبناء - N:M)
-- ------------------------------------------------------------------------------
CREATE TABLE `guardian_student` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `guardian_id` BIGINT UNSIGNED NOT NULL,
  `student_id` BIGINT UNSIGNED NOT NULL,
  `relationship_type` ENUM('father', 'mother', 'brother', 'guardian') NOT NULL DEFAULT 'father',
  `is_verified` TINYINT(1) NOT NULL DEFAULT 0,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_guardian_student_unique` (`guardian_id`, `student_id`),
  KEY `idx_guardian_student_student` (`student_id`),
  CONSTRAINT `fk_gs_guardian` FOREIGN KEY (`guardian_id`) REFERENCES `users` (`id`) ON DELETE CASCADE,
  CONSTRAINT `fk_gs_student` FOREIGN KEY (`student_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 4. Table: teacher_profiles (ملفات المعلمين ونسب الأرباح)
-- ------------------------------------------------------------------------------
CREATE TABLE `teacher_profiles` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `user_id` BIGINT UNSIGNED NOT NULL,
  `bio` TEXT DEFAULT NULL,
  `specialization` VARCHAR(150) NOT NULL,
  `revenue_share_pct` DECIMAL(5,2) NOT NULL DEFAULT 45.00,
  `contract_type` ENUM('exclusive', 'non_exclusive') NOT NULL DEFAULT 'exclusive',
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_teacher_user` (`user_id`),
  CONSTRAINT `fk_teacher_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 5. Table: subjects (المواد التعليمية)
-- ------------------------------------------------------------------------------
CREATE TABLE `subjects` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(150) NOT NULL,
  `code` VARCHAR(50) NOT NULL UNIQUE,
  `stream` ENUM('scientific', 'literary', 'common') NOT NULL DEFAULT 'common',
  `is_active` TINYINT(1) NOT NULL DEFAULT 1,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 6. Table: courses (الدورات التدريبية)
-- ------------------------------------------------------------------------------
CREATE TABLE `courses` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `uuid` CHAR(36) NOT NULL,
  `subject_id` BIGINT UNSIGNED NOT NULL,
  `teacher_id` BIGINT UNSIGNED NOT NULL,
  `title` VARCHAR(255) NOT NULL,
  `description` TEXT DEFAULT NULL,
  `semester` ENUM('first', 'second', 'full_year', 'intensive') NOT NULL DEFAULT 'first',
  `price_jod` DECIMAL(8,2) NOT NULL DEFAULT 35.00,
  `thumbnail_url` VARCHAR(500) DEFAULT NULL,
  `is_published` TINYINT(1) NOT NULL DEFAULT 0,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_courses_uuid` (`uuid`),
  KEY `idx_courses_subject` (`subject_id`),
  KEY `idx_courses_teacher` (`teacher_id`),
  CONSTRAINT `fk_courses_subject` FOREIGN KEY (`subject_id`) REFERENCES `subjects` (`id`) ON DELETE RESTRICT,
  CONSTRAINT `fk_courses_teacher` FOREIGN KEY (`teacher_id`) REFERENCES `users` (`id`) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 7. Table: lessons (الدروس والفيديوهات المربوطة بـ Bunny Stream)
-- ------------------------------------------------------------------------------
CREATE TABLE `lessons` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `course_id` BIGINT UNSIGNED NOT NULL,
  `title` VARCHAR(255) NOT NULL,
  `sequence_order` INT UNSIGNED NOT NULL DEFAULT 1,
  `bunny_video_id` VARCHAR(100) NOT NULL,
  `duration_seconds` INT UNSIGNED NOT NULL DEFAULT 0,
  `is_free_preview` TINYINT(1) NOT NULL DEFAULT 0,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_lessons_course` (`course_id`),
  CONSTRAINT `fk_lessons_course` FOREIGN KEY (`course_id`) REFERENCES `courses` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 8. Table: quizzes (الكويزات داخل الفيديو - Socratic Checkpoints)
-- ------------------------------------------------------------------------------
CREATE TABLE `quizzes` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `lesson_id` BIGINT UNSIGNED NOT NULL,
  `title` VARCHAR(255) NOT NULL,
  `timestamp_seconds` INT UNSIGNED NOT NULL DEFAULT 0,
  `is_mandatory` TINYINT(1) NOT NULL DEFAULT 1,
  `rewind_on_fail_seconds` INT UNSIGNED NOT NULL DEFAULT 45,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_quizzes_lesson` (`lesson_id`),
  CONSTRAINT `fk_quizzes_lesson` FOREIGN KEY (`lesson_id`) REFERENCES `lessons` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 9. Table: questions (الأسئلة)
-- ------------------------------------------------------------------------------
CREATE TABLE `questions` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `quiz_id` BIGINT UNSIGNED NOT NULL,
  `question_text` TEXT NOT NULL,
  `explanation_text` TEXT DEFAULT NULL,
  `points` INT UNSIGNED NOT NULL DEFAULT 1,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_questions_quiz` (`quiz_id`),
  CONSTRAINT `fk_questions_quiz` FOREIGN KEY (`quiz_id`) REFERENCES `quizzes` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 10. Table: question_options (خيارات الإجابة)
-- ------------------------------------------------------------------------------
CREATE TABLE `question_options` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `question_id` BIGINT UNSIGNED NOT NULL,
  `option_text` TEXT NOT NULL,
  `is_correct` TINYINT(1) NOT NULL DEFAULT 0,
  PRIMARY KEY (`id`),
  KEY `idx_options_question` (`question_id`),
  CONSTRAINT `fk_options_question` FOREIGN KEY (`question_id`) REFERENCES `questions` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 11. Table: lesson_progress (سجل متابعة ونبض المشاهدة)
-- ------------------------------------------------------------------------------
CREATE TABLE `lesson_progress` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `user_id` BIGINT UNSIGNED NOT NULL,
  `lesson_id` BIGINT UNSIGNED NOT NULL,
  `last_watched_second` INT UNSIGNED NOT NULL DEFAULT 0,
  `max_watched_second` INT UNSIGNED NOT NULL DEFAULT 0,
  `completion_pct` DECIMAL(5,2) NOT NULL DEFAULT 0.00,
  `is_completed` TINYINT(1) NOT NULL DEFAULT 0,
  `updated_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_user_lesson_progress` (`user_id`, `lesson_id`),
  KEY `idx_progress_lesson` (`lesson_id`),
  CONSTRAINT `fk_progress_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE,
  CONSTRAINT `fk_progress_lesson` FOREIGN KEY (`lesson_id`) REFERENCES `lessons` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 12. Table: voice_notes (الملاحظات الصوتية والتفريغ الذكي)
-- ------------------------------------------------------------------------------
CREATE TABLE `voice_notes` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `uuid` CHAR(36) NOT NULL,
  `user_id` BIGINT UNSIGNED NOT NULL,
  `lesson_id` BIGINT UNSIGNED NOT NULL,
  `timestamp_seconds` INT UNSIGNED NOT NULL DEFAULT 0,
  `audio_url` VARCHAR(500) NOT NULL,
  `transcript_text` TEXT DEFAULT NULL,
  `ai_summary` TEXT DEFAULT NULL,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_voice_notes_uuid` (`uuid`),
  KEY `idx_voice_notes_user_lesson` (`user_id`, `lesson_id`),
  CONSTRAINT `fk_vn_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE,
  CONSTRAINT `fk_vn_lesson` FOREIGN KEY (`lesson_id`) REFERENCES `lessons` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 13. Table: user_devices (بصمة الأجهزة المربوطة بالجلسات)
-- ------------------------------------------------------------------------------
CREATE TABLE `user_devices` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `user_id` BIGINT UNSIGNED NOT NULL,
  `device_fingerprint` VARCHAR(64) NOT NULL,
  `device_name` VARCHAR(150) DEFAULT NULL,
  `platform` ENUM('android', 'ios', 'windows', 'macos', 'web') NOT NULL,
  `is_active` TINYINT(1) NOT NULL DEFAULT 1,
  `last_active_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_user_device_fingerprint` (`user_id`, `device_fingerprint`),
  CONSTRAINT `fk_ud_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ------------------------------------------------------------------------------
-- 14. Table: otp_verifications (رموز التحقق عبر منصة صقل)
-- ------------------------------------------------------------------------------
CREATE TABLE `otp_verifications` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `phone_hash` VARCHAR(64) NOT NULL,
  `otp_code_hash` VARCHAR(255) NOT NULL,
  `attempts` INT UNSIGNED NOT NULL DEFAULT 0,
  `is_used` TINYINT(1) NOT NULL DEFAULT 0,
  `expires_at` TIMESTAMP NOT NULL,
  `created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_otp_phone_hash` (`phone_hash`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

SET FOREIGN_KEY_CHECKS = 1;