/**
 * generationStore — SSE进度 / 图片候选 / 飞轮注入
 * image_candidate 无 batch 字段，所以 imageCandidates 平铺存储
 */
import { create } from 'zustand';
import { SseConnectionStatus } from '@/lib/sse';
import { TextCandidate, ImageCandidate } from '@/types/index';
// 懒引入 taskStore，避免循环依赖（taskStore 不引 generationStore）
import { useTaskStore } from '@/stores/taskStore';

interface FailedBatch {
  batch: string;  // 图片角色名（"hook"/"pain"等），对应 BE batch_failed.batch 字段
  reason: string;
  retryable: boolean;
}

// 生成阶段（驱动阶段进度条，对齐产品包"有阶段进度"体验 #3#4）
// idle→分析竞品→生成文案→配图→完成；failed 单列
export type GenStage = 'idle' | 'analyzing' | 'text' | 'image' | 'done' | 'failed';

// 文案产出结果原因（B1）——task_done 透传，区分"完成但没出文案"的真实原因
export type TextOutcomeReason =
  | 'scoring_unavailable'   // 评分服务不可用（apiports+codeproxy都挂）
  | 'generation_failed'     // 文案生成本身失败
  | 'quality_filtered'      // 生成了但全部未达标
  | 'replenishing'          // 有产出但不足，后台补充中
  | null;                   // 正常足量

export interface TextOutcome {
  saved: number;
  target: number;
  reason: TextOutcomeReason;
}

interface GenerationState {
  // 连接状态
  connectionStatus: SseConnectionStatus;
  reconnectAttempt: number;

  // 当前生成阶段（#3#4 阶段进度）
  stage: GenStage;

  // 文案生成进度
  textDone: number;
  textTotal: number;
  textCandidates: TextCandidate[];

  // 图片生成进度（平铺，不分 batch — 契约无 batch 字段）
  imageDone: number;
  imageTotal: number;
  imageCandidates: ImageCandidate[];
  failedBatches: FailedBatch[];

  // 任务级致命错误(SSE error事件,生成彻底失败)。区别于图片批次级 failedBatches。
  fatalError: { code: number; message: string } | null;

  // 飞轮注入（飞轮隐形，只显注入提示，无"训练AI"按钮）
  flywheelInjected: {
    recentPreference: string;
    rejectReasons: string[];
    signalCount?: number;
  } | null;

  // 任务启动时间戳（ms），task_started 事件到达时记录，用于 ETA 推算（A1/A2）
  startedAt: number | null;

  // 文案产出结果（B1）——task_done 到达时落定，驱动"完成但没出文案"的明确提示
  textOutcome: TextOutcome | null;

  setConnectionStatus: (s: SseConnectionStatus, attempt?: number) => void;
  setStage: (stage: GenStage) => void;
  setStartedAt: (ts: number) => void;
  setTextOutcome: (outcome: TextOutcome) => void;
  setTextProgress: (done: number, total: number) => void;
  addTextCandidate: (candidate: TextCandidate) => void;
  patchTextCandidateScore: (candidateId: number, score: TextCandidate['score']) => void;
  patchTextCandidateContent: (candidateId: number, content: string) => void;
  removeTextCandidate: (candidateId: number) => void;
  removeImageCandidate: (candidateId: number) => void;
  setImageProgress: (done: number, total: number) => void;
  addImageCandidate: (candidate: ImageCandidate) => void;
  markBatchFailed: (batch: string, reason: string, retryable: boolean) => void;
  setFatalError: (code: number, message: string) => void;
  setFlywheelInjected: (data: { recentPreference: string; rejectReasons: string[]; signalCount?: number }) => void;
  hydrateFromTask: (data: {
    textCandidates: TextCandidate[];
    imageCandidates: ImageCandidate[];
  }) => void;
  reset: () => void;
}

export const useGenerationStore = create<GenerationState>((set) => ({
  connectionStatus: 'connecting',
  reconnectAttempt: 0,
  stage: 'idle',
  startedAt: null,
  textOutcome: null,
  textDone: 0,
  textTotal: 0,
  textCandidates: [],
  imageDone: 0,
  imageTotal: 0,
  imageCandidates: [],
  failedBatches: [],
  fatalError: null,
  flywheelInjected: null,

  setConnectionStatus(s, attempt = 0) {
    set({ connectionStatus: s, reconnectAttempt: attempt });
  },

  setStage(stage) {
    set({ stage });
  },

  setStartedAt(ts) {
    set({ startedAt: ts });
  },

  setTextOutcome(outcome) {
    set({ textOutcome: outcome });
  },

  setTextProgress(done, total) {
    set({ textDone: done, textTotal: total });
  },

  addTextCandidate(candidate) {
    set((s) => {
      const exists = s.textCandidates.some((tc) => tc.candidate_id === candidate.candidate_id);
      return {
        textCandidates: exists
          ? s.textCandidates.map((tc) => tc.candidate_id === candidate.candidate_id ? { ...tc, ...candidate } : tc)
          : [...s.textCandidates, candidate],
      };
    });
  },

  patchTextCandidateScore(candidateId, score) {
    set((s) => ({
      textCandidates: s.textCandidates.map((tc) =>
        tc.candidate_id === candidateId ? { ...tc, score } : tc
      ),
    }));
  },

  patchTextCandidateContent(candidateId, content) {
    set((s) => ({
      textCandidates: s.textCandidates.map((tc) =>
        tc.candidate_id === candidateId ? { ...tc, content, edited: true } : tc
      ),
    }));
  },

  removeTextCandidate(candidateId) {
    set((s) => ({
      textCandidates: s.textCandidates.filter((tc) => tc.candidate_id !== candidateId),
    }));
    // 同步清选中态
    useTaskStore.getState().deselectText(candidateId);
  },

  removeImageCandidate(candidateId) {
    set((s) => ({
      imageCandidates: s.imageCandidates.filter((ic) => ic.candidate_id !== candidateId),
    }));
    useTaskStore.getState().deselectImage(candidateId);
  },

  setImageProgress(done, total) {
    set({ imageDone: done, imageTotal: total });
  },

  addImageCandidate(candidate) {
    set((s) => {
      const exists = s.imageCandidates.some((ic) => ic.candidate_id === candidate.candidate_id);
      return {
        imageCandidates: exists
          ? s.imageCandidates.map((ic) => ic.candidate_id === candidate.candidate_id ? { ...ic, ...candidate } : ic)
          : [...s.imageCandidates, candidate],
      };
    });
  },

  markBatchFailed(batch, reason, retryable) {
    set((s) => ({
      failedBatches: [...s.failedBatches, { batch, reason, retryable }],
    }));
  },

  setFatalError(code, message) {
    set({ fatalError: { code, message } });
  },

  setFlywheelInjected(data) {
    set({ flywheelInjected: data });
  },

  // 进入已完成/进行中任务时一次性回填（历史任务 SSE 不重放，必须主动拉接口）
  // 同时把带 is_selected 标记的候选 id 写进 taskStore，修复跨页选中态丢失（B2）
  hydrateFromTask({ textCandidates, imageCandidates }) {
    set({
      textCandidates,
      textDone: textCandidates.length,
      textTotal: textCandidates.length || 0,
      imageCandidates,
      imageDone: imageCandidates.length,
      imageTotal: imageCandidates.length || 0,
    });
    // 若候选带 is_selected 字段，同步还原 taskStore 选中态
    const selectedTexts = textCandidates
      .filter((c) => (c as TextCandidate & { is_selected?: boolean }).is_selected)
      .map((c) => c.candidate_id);
    const selectedImages = imageCandidates
      .filter((c) => (c as ImageCandidate & { is_selected?: boolean }).is_selected)
      .map((c) => c.candidate_id);
    // 方案B（倩倩姐2026-06-26拍板）：选中回填只做「首次进页恢复历史」。
    // 本地已有选中=用户正在挑（图片/文案选中只存本地、点"去生图/去确认"才提交后端），
    // 此时 5 秒轮询的后端快照绝不能整体覆盖本地，否则未提交的选中过几秒就被抹掉。
    const taskState = useTaskStore.getState();
    const localHasSelection =
      taskState.selectedTextIds.length > 0 || taskState.selectedImageIds.length > 0;
    if (!localHasSelection && (selectedTexts.length || selectedImages.length)) {
      taskState.setSelections(selectedTexts, selectedImages);
    }
  },

  reset() {
    set({
      connectionStatus: 'connecting', reconnectAttempt: 0, stage: 'idle',
      textDone: 0, textTotal: 0, textCandidates: [],
      imageDone: 0, imageTotal: 0, imageCandidates: [],
      failedBatches: [], fatalError: null, flywheelInjected: null, startedAt: null,
      textOutcome: null,
    });
  },
}));