import type { JSX } from "react"
import { Suspense } from "react"
import { notFound } from "next/navigation"
import { getLessonPlanById } from "@/modules/lesson-preparation/data-access"
import { LessonPlanEditor } from "@/modules/lesson-preparation/components/lesson-plan-editor"
import { getTeacherClasses } from "@/modules/classes/data-access"
import { getTextbookById, getChaptersByTextbookId } from "@/modules/textbooks/data-access"
import { getAuthContext } from "@/shared/lib/auth-guard"
import { Skeleton } from "@/shared/components/ui/skeleton"
import {
  AiClientProvider,
  type AiClientService,
} from "@/modules/ai/context/ai-client-provider"
import {
  aiChatAction,
  suggestSimilarQuestionsAction,
  suggestGradingAction,
  generateLessonContentAction,
  generateQuestionVariantAction,
  analyzeWeaknessAction,
} from "@/modules/ai/actions"

export const dynamic = "force-dynamic"

/**
 * 构建 AI 客户端服务（Server Action 引用集合）
 *
 * 通过 React Context 注入，客户端组件不直接 import actions，
 * 遵循依赖注入模式，便于测试时替换为 mock。
 */
function createAiClientService(): AiClientService {
  return {
    chat: aiChatAction,
    suggestSimilarQuestions: suggestSimilarQuestionsAction,
    suggestGrading: suggestGradingAction,
    generateLessonContent: generateLessonContentAction,
    generateQuestionVariant: generateQuestionVariantAction,
    analyzeWeakness: analyzeWeaknessAction,
  }
}

export default async function EditLessonPlanPage({
  params,
}: {
  params: Promise<{ planId: string }>
}): Promise<JSX.Element> {
  const { planId } = await params
  const ctx = await getAuthContext()

  const [plan, teacherClasses] = await Promise.all([
    getLessonPlanById(planId, ctx.userId),
    getTeacherClasses({ teacherId: ctx.userId }),
  ])
  if (!plan) notFound()

  const classes = teacherClasses.map((c) => ({ id: c.id, name: c.name }))

  // 拉取教材/章节标题用于工具栏显示
  let textbookTitle: string | undefined
  let chapterTitle: string | undefined
  if (plan.textbookId) {
    const textbook = await getTextbookById(plan.textbookId)
    textbookTitle = textbook?.title
    if (plan.chapterId) {
      const chapters = await getChaptersByTextbookId(plan.textbookId)
      const findChapter = (list: typeof chapters): typeof chapters[number] | undefined => {
        for (const ch of list) {
          if (ch.id === plan.chapterId) return ch
          if (ch.children && ch.children.length > 0) {
            const found = findChapter(ch.children as typeof chapters)
            if (found) return found
          }
        }
        return undefined
      }
      const chapter = findChapter(chapters)
      chapterTitle = chapter?.title
    }
  }

  const aiClientService = createAiClientService()

  return (
    <AiClientProvider service={aiClientService}>
      <div className="h-[calc(100vh-4rem)]">
        <Suspense
          fallback={
            <div className="flex h-full items-center justify-center">
              <Skeleton className="h-[80%] w-[80%]" />
            </div>
          }
        >
          <LessonPlanEditor
            planId={plan.id}
            initialTitle={plan.title}
            initialDoc={plan.content}
            textbookId={plan.textbookId ?? undefined}
            chapterId={plan.chapterId ?? undefined}
            textbookTitle={textbookTitle}
            chapterTitle={chapterTitle}
            classes={classes}
          />
        </Suspense>
      </div>
    </AiClientProvider>
  )
}