-- CreateTable
CREATE TABLE `learning_journeys` (
    `userId` BIGINT UNSIGNED NOT NULL,
    `currentStep` VARCHAR(32) NOT NULL DEFAULT 'registered',
    `preTestCompletedAt` DATETIME(3) NULL,
    `trainingStartedAt` DATETIME(3) NULL,
    `trainingCompletedAt` DATETIME(3) NULL,
    `postTestCompletedAt` DATETIME(3) NULL,
    `lastActivityAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    PRIMARY KEY (`userId`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `course_sessions` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `sessionKey` VARCHAR(64) NOT NULL,
    `order` INTEGER NOT NULL,
    `title` VARCHAR(191) NOT NULL,
    `description` TEXT NOT NULL,
    `estimatedDurationMinutes` INTEGER NOT NULL,
    `blocks` JSON NOT NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    UNIQUE INDEX `course_sessions_sessionKey_key`(`sessionKey`),
    UNIQUE INDEX `course_sessions_order_key`(`order`),
    INDEX `idx_course_sessions_order`(`order`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `session_progress` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `userId` BIGINT UNSIGNED NOT NULL,
    `sessionOrder` INTEGER NOT NULL,
    `status` ENUM('not_started', 'in_progress', 'completed') NOT NULL DEFAULT 'not_started',
    `startedAt` DATETIME(3) NULL,
    `completedAt` DATETIME(3) NULL,
    `completionMetadata` JSON NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    INDEX `idx_session_progress_user_status`(`userId`, `status`),
    UNIQUE INDEX `uq_session_progress_user_order`(`userId`, `sessionOrder`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `assessment_attempts` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `userId` BIGINT UNSIGNED NOT NULL,
    `phase` ENUM('pre', 'post') NOT NULL,
    `status` ENUM('submitted', 'scored') NOT NULL DEFAULT 'scored',
    `submittedAt` DATETIME(3) NOT NULL,
    `scoredAt` DATETIME(3) NOT NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    INDEX `idx_assessment_attempts_user_phase_submitted`(`userId`, `phase`, `submittedAt`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `assessment_answers` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `attemptId` BIGINT UNSIGNED NOT NULL,
    `questionId` VARCHAR(32) NOT NULL,
    `rawValue` INTEGER NOT NULL,
    `points` INTEGER NOT NULL,
    `dimension` VARCHAR(32) NOT NULL,
    `isReverseScored` BOOLEAN NOT NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),

    UNIQUE INDEX `uq_assessment_answers_attempt_question`(`attemptId`, `questionId`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `assessment_scores` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `attemptId` BIGINT UNSIGNED NOT NULL,
    `metricKey` VARCHAR(32) NOT NULL,
    `rawScore` INTEGER NOT NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),

    UNIQUE INDEX `uq_assessment_scores_attempt_metric`(`attemptId`, `metricKey`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `chat_sessions` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `userId` BIGINT UNSIGNED NOT NULL,
    `sessionOrder` INTEGER NOT NULL,
    `startedAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `endedAt` DATETIME(3) NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    INDEX `idx_chat_sessions_user_order_started`(`userId`, `sessionOrder`, `startedAt`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `chat_messages` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `chatSessionId` BIGINT UNSIGNED NOT NULL,
    `role` ENUM('system', 'user', 'assistant') NOT NULL,
    `content` TEXT NOT NULL,
    `metadata` JSON NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),

    INDEX `idx_chat_messages_session_created`(`chatSessionId`, `createdAt`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `ai_analysis_runs` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `userId` BIGINT UNSIGNED NOT NULL,
    `chatSessionId` BIGINT UNSIGNED NULL,
    `provider` VARCHAR(64) NOT NULL,
    `model` VARCHAR(128) NOT NULL,
    `status` ENUM('queued', 'running', 'succeeded', 'failed') NOT NULL DEFAULT 'queued',
    `latencyMs` INTEGER NULL,
    `totalTokens` INTEGER NULL,
    `errorMessage` TEXT NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    INDEX `idx_ai_analysis_runs_user_created`(`userId`, `createdAt`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- AddForeignKey
ALTER TABLE `learning_journeys` ADD CONSTRAINT `learning_journeys_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `session_progress` ADD CONSTRAINT `session_progress_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `assessment_attempts` ADD CONSTRAINT `assessment_attempts_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `assessment_answers` ADD CONSTRAINT `assessment_answers_attemptId_fkey` FOREIGN KEY (`attemptId`) REFERENCES `assessment_attempts`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `assessment_scores` ADD CONSTRAINT `assessment_scores_attemptId_fkey` FOREIGN KEY (`attemptId`) REFERENCES `assessment_attempts`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `chat_sessions` ADD CONSTRAINT `chat_sessions_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `chat_messages` ADD CONSTRAINT `chat_messages_chatSessionId_fkey` FOREIGN KEY (`chatSessionId`) REFERENCES `chat_sessions`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `ai_analysis_runs` ADD CONSTRAINT `ai_analysis_runs_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `ai_analysis_runs` ADD CONSTRAINT `ai_analysis_runs_chatSessionId_fkey` FOREIGN KEY (`chatSessionId`) REFERENCES `chat_sessions`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;