-- 任务模块 (V0.2): 项目 / 成员 / 看板列 / 任务 / 任务成员 / 标签
-- 设计口径见 docs/V0.2/任务模块/任务模块数据库设计文档.md

-- CreateTable
CREATE TABLE `Project` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `name` VARCHAR(50) NOT NULL,
    `ownerId` INTEGER NOT NULL,
    `isPersonal` BOOLEAN NOT NULL DEFAULT false,
    `archived` BOOLEAN NOT NULL DEFAULT false,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    INDEX `Project_ownerId_idx`(`ownerId`),
    INDEX `Project_archived_idx`(`archived`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `ProjectMember` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `projectId` INTEGER NOT NULL,
    `userId` INTEGER NOT NULL,
    `permission` VARCHAR(191) NOT NULL DEFAULT 'member',
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),

    UNIQUE INDEX `ProjectMember_projectId_userId_key`(`projectId`, `userId`),
    INDEX `ProjectMember_userId_idx`(`userId`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `BoardColumn` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `projectId` INTEGER NOT NULL,
    `name` VARCHAR(20) NOT NULL,
    `sortOrder` INTEGER NOT NULL DEFAULT 0,
    `boundStatus` VARCHAR(8) NULL,
    `retention` VARCHAR(8) NOT NULL DEFAULT 'forever',
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    UNIQUE INDEX `BoardColumn_projectId_name_key`(`projectId`, `name`),
    INDEX `BoardColumn_projectId_sortOrder_idx`(`projectId`, `sortOrder`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `Task` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `projectId` INTEGER NOT NULL,
    `columnId` INTEGER NOT NULL,
    `parentId` INTEGER NULL,
    `title` VARCHAR(200) NOT NULL,
    `description` TEXT NOT NULL,
    `status` VARCHAR(8) NOT NULL DEFAULT 'todo',
    `doneAt` DATETIME(3) NULL,
    `assigneeId` INTEGER NULL,
    `creatorId` INTEGER NOT NULL,
    `extras` JSON NOT NULL,
    `sortOrder` INTEGER NOT NULL DEFAULT 0,
    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
    `updatedAt` DATETIME(3) NOT NULL,

    INDEX `Task_projectId_columnId_idx`(`projectId`, `columnId`),
    INDEX `Task_projectId_status_idx`(`projectId`, `status`),
    INDEX `Task_parentId_idx`(`parentId`),
    INDEX `Task_projectId_doneAt_idx`(`projectId`, `doneAt`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `TaskMember` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `taskId` INTEGER NOT NULL,
    `userId` INTEGER NOT NULL,

    UNIQUE INDEX `TaskMember_taskId_userId_key`(`taskId`, `userId`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- CreateTable
CREATE TABLE `TaskTag` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `taskId` INTEGER NOT NULL,
    `name` VARCHAR(20) NOT NULL,

    INDEX `TaskTag_taskId_idx`(`taskId`),
    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- AddForeignKey
ALTER TABLE `Project` ADD CONSTRAINT `Project_ownerId_fkey` FOREIGN KEY (`ownerId`) REFERENCES `User`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `ProjectMember` ADD CONSTRAINT `ProjectMember_projectId_fkey` FOREIGN KEY (`projectId`) REFERENCES `Project`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `ProjectMember` ADD CONSTRAINT `ProjectMember_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `User`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `BoardColumn` ADD CONSTRAINT `BoardColumn_projectId_fkey` FOREIGN KEY (`projectId`) REFERENCES `Project`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `Task` ADD CONSTRAINT `Task_projectId_fkey` FOREIGN KEY (`projectId`) REFERENCES `Project`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `Task` ADD CONSTRAINT `Task_columnId_fkey` FOREIGN KEY (`columnId`) REFERENCES `BoardColumn`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `Task` ADD CONSTRAINT `Task_parentId_fkey` FOREIGN KEY (`parentId`) REFERENCES `Task`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `Task` ADD CONSTRAINT `Task_assigneeId_fkey` FOREIGN KEY (`assigneeId`) REFERENCES `User`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `Task` ADD CONSTRAINT `Task_creatorId_fkey` FOREIGN KEY (`creatorId`) REFERENCES `User`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `TaskMember` ADD CONSTRAINT `TaskMember_taskId_fkey` FOREIGN KEY (`taskId`) REFERENCES `Task`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `TaskMember` ADD CONSTRAINT `TaskMember_userId_fkey` FOREIGN KEY (`userId`) REFERENCES `User`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE `TaskTag` ADD CONSTRAINT `TaskTag_taskId_fkey` FOREIGN KEY (`taskId`) REFERENCES `Task`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;