/**
 * M2 协同备课 - 评论 Server Actions
 */
"use server";

import { revalidatePath } from "next/cache";
import { z } from "zod";
import {
  getCommentsByPlanId,
  getCommentsByBlockId,
  createComment,
  updateCommentContent,
  toggleCommentResolved,
  deleteComment,
  countUnresolvedComments,
} from "./data-access-comments";
import type { LessonPlanComment } from "./data-access-comments";
import type { ActionState } from "@/shared/types/action-state";
import { getAuthContext, requirePermission } from "@/shared/lib/auth-guard";
import { handleActionError } from "@/shared/lib/action-utils";
import { Permissions } from "@/shared/types/permissions";

const createCommentSchema = z.object({
  planId: z.string().min(1, "error.planIdRequired"),
  blockId: z.string().min(1, "error.blockIdRequired"),
  content: z.string().min(1, "error.contentRequired").max(2000, "error.contentTooLong"),
  parentCommentId: z.string().optional(),
});

const updateCommentSchema = z.object({
  commentId: z.string().min(1, "error.commentIdRequired"),
  content: z.string().min(1, "error.contentRequired").max(2000, "error.contentTooLong"),
});

/**
 * 查询课案评论
 */
export async function getLessonPlanCommentsAction(
  planId: string,
  blockId?: string,
): Promise<ActionState<{ items: LessonPlanComment[] }>> {
  try {
    await requirePermission(Permissions.LESSON_PLAN_READ);
    const items = blockId
      ? await getCommentsByBlockId(planId, blockId)
      : await getCommentsByPlanId(planId);
    return { success: true, data: { items } };
  } catch (e) {
    return handleActionError(e);
  }
}

/**
 * 创建评论
 */
export async function createLessonPlanCommentAction(
  input: Record<string, unknown>,
): Promise<ActionState<{ comment: LessonPlanComment }>> {
  try {
    await requirePermission(Permissions.LESSON_PLAN_UPDATE);
    const parseResult = createCommentSchema.safeParse(input);
    if (!parseResult.success) {
      return {
        success: false,
        message: "Invalid input",
        errors: Object.fromEntries(
          Object.entries(parseResult.error.flatten().fieldErrors),
        ),
      };
    }
    const auth = await getAuthContext();
    if (!auth.userId) {
      return { success: false, message: "Unauthorized" };
    }
    const comment = await createComment(parseResult.data, auth.userId);
    revalidatePath(`/teacher/lesson-plans/${parseResult.data.planId}/edit`);
    return { success: true, data: { comment } };
  } catch (e) {
    return handleActionError(e);
  }
}

/**
 * 更新评论
 */
export async function updateLessonPlanCommentAction(
  input: Record<string, unknown>,
): Promise<ActionState<null>> {
  try {
    await requirePermission(Permissions.LESSON_PLAN_UPDATE);
    const parseResult = updateCommentSchema.safeParse(input);
    if (!parseResult.success) {
      return { success: false, message: "Invalid input" };
    }
    await updateCommentContent(parseResult.data.commentId, parseResult.data.content);
    return { success: true, data: null };
  } catch (e) {
    return handleActionError(e);
  }
}

/**
 * 切换评论解决状态
 */
export async function toggleCommentResolvedAction(
  commentId: string,
): Promise<ActionState<null>> {
  try {
    await requirePermission(Permissions.LESSON_PLAN_UPDATE);
    await toggleCommentResolved(commentId);
    return { success: true, data: null };
  } catch (e) {
    return handleActionError(e);
  }
}

/**
 * 删除评论
 */
export async function deleteLessonPlanCommentAction(
  commentId: string,
): Promise<ActionState<null>> {
  try {
    await requirePermission(Permissions.LESSON_PLAN_UPDATE);
    await deleteComment(commentId);
    return { success: true, data: null };
  } catch (e) {
    return handleActionError(e);
  }
}

/**
 * 统计未解决评论数（用于列表卡片徽章）
 */
export async function getUnresolvedCommentCountAction(
  planId: string,
): Promise<ActionState<{ count: number }>> {
  try {
    await requirePermission(Permissions.LESSON_PLAN_READ);
    const count = await countUnresolvedComments(planId);
    return { success: true, data: { count } };
  } catch (e) {
    return handleActionError(e);
  }
}