-- Cumulative homework/assignments: definitions, user instances, multi-reports, daily entries.

CREATE TABLE `assignment_definitions` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `key` VARCHAR(64) NOT NULL,
    `sessionOrder` INTEGER NOT NULL,
    `title` VARCHAR(191) NOT NULL,
    `description` TEXT NOT NULL,
    `instructions` TEXT NOT NULL,
    `assignmentType` ENUM('ONE_TIME', 'DAILY', 'ONGOING') NOT NULL,
    `formSchema` JSON NULL,
    `expectedDurationDays` INTEGER NULL,
    `suggestedEndDay` INTEGER NULL,
    `requiresReport` BOOLEAN NOT NULL DEFAULT true,
    `blocksNextSession` BOOLEAN NOT NULL DEFAULT false,
    `isFinalAssignment` BOOLEAN NOT NULL DEFAULT false,
    `displayOrder` INTEGER NOT NULL DEFAULT 0,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    UNIQUE INDEX `assignment_definitions_key_key`(`key`),
    INDEX `idx_assignment_definitions_session_order`(`sessionOrder`),
    INDEX `idx_assignment_definitions_display_order`(`displayOrder`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

CREATE TABLE `user_assignments` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `userId` BIGINT UNSIGNED NOT NULL,
    `definitionId` BIGINT UNSIGNED NOT NULL,
    `status` ENUM('NOT_STARTED', 'ACTIVE', 'IN_PROGRESS', 'REPORTED', 'COMPLETED') NOT NULL DEFAULT 'ACTIVE',
    `activatedAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `startedAt` DATETIME(3) NULL,
    `lastActivityAt` DATETIME(3) NULL,
    `completedAt` DATETIME(3) NULL,
    `draftData` JSON NULL,
    `completionNote` TEXT NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    INDEX `idx_user_assignments_user_status`(`userId`, `status`),
    INDEX `idx_user_assignments_user_activated`(`userId`, `activatedAt`),
    UNIQUE INDEX `uq_user_assignments_user_definition`(`userId`, `definitionId`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

CREATE TABLE `assignment_reports` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `userAssignmentId` BIGINT UNSIGNED NOT NULL,
    `userId` BIGINT UNSIGNED NOT NULL,
    `reportText` TEXT NOT NULL,
    `reportStatus` ENUM('completed', 'in_progress', 'difficult', 'not_started') NOT NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),

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

CREATE TABLE `assignment_daily_entries` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `userAssignmentId` BIGINT UNSIGNED NOT NULL,
    `userId` BIGINT UNSIGNED NOT NULL,
    `entryDate` DATE NOT NULL,
    `responseData` JSON NOT NULL,
    `note` TEXT NULL,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    INDEX `idx_assignment_daily_entries_user_date`(`userId`, `entryDate`),
    UNIQUE INDEX `uq_assignment_daily_entries_ua_date`(`userAssignmentId`, `entryDate`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

ALTER TABLE `assignment_definitions` ADD CONSTRAINT `assignment_definitions_sessionOrder_fkey` FOREIGN KEY (`sessionOrder`) REFERENCES `course_sessions`(`order`) ON DELETE RESTRICT ON UPDATE CASCADE;

ALTER TABLE `user_assignments` ADD CONSTRAINT `user_assignments_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE `user_assignments` ADD CONSTRAINT `user_assignments_definitionId_fkey` FOREIGN KEY (`definitionId`) REFERENCES `assignment_definitions`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;

ALTER TABLE `assignment_reports` ADD CONSTRAINT `assignment_reports_userAssignmentId_fkey` FOREIGN KEY (`userAssignmentId`) REFERENCES `user_assignments`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE `assignment_reports` ADD CONSTRAINT `assignment_reports_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE `assignment_daily_entries` ADD CONSTRAINT `assignment_daily_entries_userAssignmentId_fkey` FOREIGN KEY (`userAssignmentId`) REFERENCES `user_assignments`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE `assignment_daily_entries` ADD CONSTRAINT `assignment_daily_entries_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;