/**
 * 任务中心 Prisma 行 → 共享 DTO 映射（A6-BE-04）
 *
 * - 列表 / 详情显式 select（DB-10：列表不返回 payload 等大 JSONB）；
 * - 金额 `estimated_cost` 为 Decimal(14,4)，出参统一转 number（元，2 位小数展示由前端处理）；
 * - DB 存英文 code，未知 code 视为脏数据直接抛错（由全局过滤器转 500，不静默降级成错误状态）。
 */
import {
  type MediaTaskDetail,
  type MediaTaskItem,
  type MediaTaskSummary,
  TASK_ITEM_STATUSES,
  TASK_STATUSES,
  TASK_TYPES,
  type TaskItemStatus,
  type TaskStatus,
  type TaskType,
} from '@lingxi/shared';
import type { Prisma } from '@prisma/client';

/** 摘要 select：列表与详情共用（详情再追加 payload / 取消 / 错误字段） */
export const MEDIA_TASK_SUMMARY_SELECT = {
  id: true,
  type: true,
  status: true,
  title: true,
  customerId: true,
  customerName: true,
  itemTotal: true,
  itemSucceeded: true,
  itemFailed: true,
  itemSkipped: true,
  progress: true,
  estimatedItems: true,
  estimatedCost: true,
  estimatedSeconds: true,
  createdBy: true,
  createdByName: true,
  createdAt: true,
  startedAt: true,
  finishedAt: true,
} satisfies Prisma.MediaTaskSelect;

export type MediaTaskSummaryRow = Prisma.MediaTaskGetPayload<{
  select: typeof MEDIA_TASK_SUMMARY_SELECT;
}>;

export const MEDIA_TASK_DETAIL_SELECT = {
  ...MEDIA_TASK_SUMMARY_SELECT,
  payloadJson: true,
  cancelRequestedAt: true,
  lastErrorCode: true,
  lastErrorMessage: true,
} satisfies Prisma.MediaTaskSelect;

export type MediaTaskDetailRow = Prisma.MediaTaskGetPayload<{
  select: typeof MEDIA_TASK_DETAIL_SELECT;
}>;

/** 任务项 select：列表 / 详情只给状态与失败原因，不含产物引用 */
export const MEDIA_ITEM_SELECT = {
  id: true,
  seq: true,
  status: true,
  failureCode: true,
  failureMessage: true,
  attempts: true,
  startedAt: true,
  finishedAt: true,
} satisfies Prisma.MediaItemSelect;

export type MediaItemRow = Prisma.MediaItemGetPayload<{ select: typeof MEDIA_ITEM_SELECT }>;

/** DB 字符串 → 任务类型（未知视为脏数据） */
export function parseTaskType(value: string): TaskType {
  const found = TASK_TYPES.find((type) => type === value);
  if (found === undefined) throw new Error(`任务类型非法：${value}`);
  return found;
}

/** DB 字符串 → 任务状态（未知视为脏数据） */
export function parseTaskStatus(value: string): TaskStatus {
  const found = TASK_STATUSES.find((status) => status === value);
  if (found === undefined) throw new Error(`任务状态非法：${value}`);
  return found;
}

/** DB 字符串 → 任务项状态（未知视为脏数据） */
export function parseTaskItemStatus(value: string): TaskItemStatus {
  const found = TASK_ITEM_STATUSES.find((status) => status === value);
  if (found === undefined) throw new Error(`任务项状态非法：${value}`);
  return found;
}

function optionalIso(value: Date | null): string | undefined {
  return value === null ? undefined : value.toISOString();
}

/** JsonB → 普通对象（只接受 object；异常结构回退空对象，详情不因此 500） */
export function toJsonObject(value: Prisma.JsonValue): Record<string, unknown> {
  if (typeof value === 'object' && value !== null && !Array.isArray(value)) {
    return value;
  }
  return {};
}

export function toMediaTaskSummary(row: MediaTaskSummaryRow): MediaTaskSummary {
  const startedAt = optionalIso(row.startedAt);
  const finishedAt = optionalIso(row.finishedAt);
  return {
    id: row.id,
    type: parseTaskType(row.type),
    status: parseTaskStatus(row.status),
    title: row.title,
    customerId: row.customerId,
    customerName: row.customerName,
    itemTotal: row.itemTotal,
    itemSucceeded: row.itemSucceeded,
    itemFailed: row.itemFailed,
    itemSkipped: row.itemSkipped,
    progress: row.progress,
    estimatedItems: row.estimatedItems,
    estimatedCost: Number(row.estimatedCost),
    estimatedSeconds: row.estimatedSeconds,
    createdBy: row.createdBy,
    createdByName: row.createdByName,
    createdAt: row.createdAt.toISOString(),
    ...(startedAt === undefined ? {} : { startedAt }),
    ...(finishedAt === undefined ? {} : { finishedAt }),
  };
}

export function toMediaTaskItem(row: MediaItemRow): MediaTaskItem {
  const startedAt = optionalIso(row.startedAt);
  const finishedAt = optionalIso(row.finishedAt);
  return {
    id: row.id,
    seq: row.seq,
    status: parseTaskItemStatus(row.status),
    ...(row.failureCode === null ? {} : { failureCode: row.failureCode }),
    ...(row.failureMessage === null ? {} : { failureMessage: row.failureMessage }),
    attempts: row.attempts,
    ...(startedAt === undefined ? {} : { startedAt }),
    ...(finishedAt === undefined ? {} : { finishedAt }),
  };
}

export function toMediaTaskDetail(
  row: MediaTaskDetailRow,
  items: MediaItemRow[],
  itemsNextCursor: string | null,
): MediaTaskDetail {
  const cancelRequestedAt = optionalIso(row.cancelRequestedAt);
  return {
    ...toMediaTaskSummary(row),
    payload: toJsonObject(row.payloadJson),
    ...(cancelRequestedAt === undefined ? {} : { cancelRequestedAt }),
    ...(row.lastErrorCode === null ? {} : { lastErrorCode: row.lastErrorCode }),
    ...(row.lastErrorMessage === null ? {} : { lastErrorMessage: row.lastErrorMessage }),
    items: items.map((item) => toMediaTaskItem(item)),
    itemsNextCursor,
  };
}