/**
 * 自动记账状态管理（plan.md「3.x JS 层分层处理」+「决策 6 跨进程通信」）。
 *
 * 统一所有自动化入口（OCR/通知/短信/截图）的检测事件，
 * 全部汇入 BillPipeline（转账识别→去重→分类→入库）。
 */

import { create } from 'zustand';
import type { ImportedEvent, LedgerIndex, Transaction } from '../domain/types';
import type { Category } from '../domain/categories';
import type { Rule } from '../domain/types';
import type { DedupConfig } from '../domain/dedup';
import type { TransferConfig } from '../domain/transferRecognizer';
import { sharedPipeline } from '../domain/pipelineSingleton';
import type { ProcessedDraft } from '../domain/billPipeline';

import { logger } from '../utils/logger';

export type AutomationSource = 'ocr' | 'notification' | 'sms' | 'screenshot' | 'manual';

export interface AutomationEvent {
  id: string;
  source: AutomationSource;
  event: ImportedEvent;
  detectedAt: string;
}

export interface AutomationState {
  /** 待处理的检测事件（未入 pipeline 前）。 */
  detected: AutomationEvent[];
  /** pipeline 处理后的草稿。 */
  drafts: ProcessedDraft[];
  /** 是否正在处理。 */
  isProcessing: boolean;
  /** 处理出错时的错误信息。 */
  error: string | null;
  /** 各入口的统计。 */
  stats: Record<AutomationSource, number>;

  // actions
  /** 添加检测事件（来自 OCR/通知/短信/截图）。 */
  addDetected: (source: AutomationSource, event: ImportedEvent) => void;
  /** 批量处理：把 detected 走 BillPipeline。 */
  processAll: (
    ledger: LedgerIndex,
    rules: Rule[],
    categories: Category[],
    history: Transaction[],
    dedupConfig?: DedupConfig,
    transferConfig?: TransferConfig,
  ) => Promise<void>;
  /** 确认单笔草稿。 */
  confirmDraft: (index: number) => ProcessedDraft | null;
  /** 拒绝单笔草稿。 */
  rejectDraft: (index: number) => void;
  /** 清空。 */
  clear: () => void;
}

/** 使用共享 pipeline 单例，保证跨 store 的并发安全。 */
const pipeline = sharedPipeline;

export const useAutomationStore = create<AutomationState>((set, get) => ({
  detected: [],
  drafts: [],
  isProcessing: false,
  error: null,
  stats: { ocr: 0, notification: 0, sms: 0, screenshot: 0, manual: 0 },

  addDetected: (source, event) => {
    logger.info('automationStore', `[收到自动化账单事件] 来源: ${source}, ID: ${event.id}, 时间: ${event.occurredAt}, 金额: ${event.amount} ${event.currency}, 对方: "${event.counterparty || '未知'}"`);
    set(state => ({
      detected: [...state.detected, {
        id: `${source}:${event.id}`,
        source,
        event,
        detectedAt: new Date().toISOString(),
      }],
      stats: { ...state.stats, [source]: state.stats[source] + 1 },
    }));
  },

  processAll: async (ledger, rules, categories, history, dedupConfig, transferConfig) => {
    const { detected } = get();
    if (detected.length === 0) return;
    const snapshotLength = detected.length;
    set({ isProcessing: true, error: null });
    try {
      const events = detected.map(d => d.event);
      const result = await pipeline.process(events, {
        ledger, rules, categories, history, dedupConfig, transferConfig,
      });
      // 只清空已处理的事件，保留处理期间新增的
      const { detected: currentDetected } = get();
      set({
        drafts: result.drafts,
        detected: currentDetected.slice(snapshotLength),
        isProcessing: false,
      });
    } catch (e) {
      logger.error('automationStore', '处理自动化账单事件异常', e);
      set({ isProcessing: false, error: e instanceof Error ? e.message : String(e) });
    }
  },

  confirmDraft: (index) => {
    const { drafts } = get();
    const draft = drafts[index];
    if (!draft) return null;
    logger.info('automationStore', `[自动化草稿确认] 确认自动记账草稿 [日期: ${draft.draft.date}, 商户: "${draft.draft.payee ?? '未知'}", 叙述: "${draft.draft.narration}"]`);
    set({ drafts: drafts.filter((_, i) => i !== index) });
    return draft;
  },

  rejectDraft: (index) => {
    const { drafts } = get();
    const draft = drafts[index];
    if (draft) {
      logger.info('automationStore', `[自动化草稿拒绝] 丢弃自动记账草稿 [日期: ${draft.draft.date}, 商户: "${draft.draft.payee ?? '未知'}", 叙述: "${draft.draft.narration}"]`);
    }
    set({ drafts: drafts.filter((_, i) => i !== index) });
  },

  clear: () => {
    logger.info('automationStore', '[自动化队列清空] 已清空自动化事件与待处理草稿');
    set({
      detected: [],
      drafts: [],
      isProcessing: false,
      stats: { ocr: 0, notification: 0, sms: 0, screenshot: 0, manual: 0 },
    });
  },
}));