import { useState, useCallback, useRef, useEffect } from 'react';
import { DEFAULT_MESSAGES, DEFAULT_CONFIG, DEBUG_TABS, MESSAGE_STATUS } from '../utils/constants';
import { loadConfig, saveConfig, loadMessages, saveMessages } from '../components/playground/configStorage';
import { processIncompleteThinkTags } from '../utils/messageUtils';

export const usePlaygroundState = () => {
  // 使用惰性初始化，确保只在组件首次挂载时加载配置和消息
  const [savedConfig] = useState(() => loadConfig());
  const [initialMessages] = useState(() => loadMessages() || DEFAULT_MESSAGES);

  // 基础配置状态
  const [inputs, setInputs] = useState(savedConfig.inputs || DEFAULT_CONFIG.inputs);
  const [parameterEnabled, setParameterEnabled] = useState(
    savedConfig.parameterEnabled || DEFAULT_CONFIG.parameterEnabled
  );
  const [showDebugPanel, setShowDebugPanel] = useState(
    savedConfig.showDebugPanel || DEFAULT_CONFIG.showDebugPanel
  );
  const [customRequestMode, setCustomRequestMode] = useState(
    savedConfig.customRequestMode || DEFAULT_CONFIG.customRequestMode
  );
  const [customRequestBody, setCustomRequestBody] = useState(
    savedConfig.customRequestBody || DEFAULT_CONFIG.customRequestBody
  );

  // UI状态
  const [showSettings, setShowSettings] = useState(false);
  const [models, setModels] = useState([]);
  const [groups, setGroups] = useState([]);
  const [status, setStatus] = useState({});

  // 消息相关状态 - 使用加载的消息初始化
  const [message, setMessage] = useState(initialMessages);

  // 调试状态
  const [debugData, setDebugData] = useState({
    request: null,
    response: null,
    timestamp: null,
    previewRequest: null,
    previewTimestamp: null
  });
  const [activeDebugTab, setActiveDebugTab] = useState(DEBUG_TABS.PREVIEW);
  const [previewPayload, setPreviewPayload] = useState(null);

  // 编辑状态
  const [editingMessageId, setEditingMessageId] = useState(null);
  const [editValue, setEditValue] = useState('');

  // Refs
  const sseSourceRef = useRef(null);
  const chatRef = useRef(null);
  const saveConfigTimeoutRef = useRef(null);
  const saveMessagesTimeoutRef = useRef(null);

  // 配置更新函数
  const handleInputChange = useCallback((name, value) => {
    setInputs(prev => ({ ...prev, [name]: value }));
  }, []);

  const handleParameterToggle = useCallback((paramName) => {
    setParameterEnabled(prev => ({
      ...prev,
      [paramName]: !prev[paramName]
    }));
  }, []);

  // 消息保存函数 - 改为立即保存，可以接受参数
  const saveMessagesImmediately = useCallback((messagesToSave) => {
    // 如果提供了参数，使用参数；否则使用当前状态
    saveMessages(messagesToSave || message);
  }, [message]);

  // 配置保存
  const debouncedSaveConfig = useCallback(() => {
    if (saveConfigTimeoutRef.current) {
      clearTimeout(saveConfigTimeoutRef.current);
    }

    saveConfigTimeoutRef.current = setTimeout(() => {
      const configToSave = {
        inputs,
        parameterEnabled,
        showDebugPanel,
        customRequestMode,
        customRequestBody,
      };
      saveConfig(configToSave);
    }, 1000);
  }, [inputs, parameterEnabled, showDebugPanel, customRequestMode, customRequestBody]);

  // 配置导入/重置
  const handleConfigImport = useCallback((importedConfig) => {
    if (importedConfig.inputs) {
      setInputs(prev => ({ ...prev, ...importedConfig.inputs }));
    }
    if (importedConfig.parameterEnabled) {
      setParameterEnabled(prev => ({ ...prev, ...importedConfig.parameterEnabled }));
    }
    if (typeof importedConfig.showDebugPanel === 'boolean') {
      setShowDebugPanel(importedConfig.showDebugPanel);
    }
    if (importedConfig.customRequestMode) {
      setCustomRequestMode(importedConfig.customRequestMode);
    }
    if (importedConfig.customRequestBody) {
      setCustomRequestBody(importedConfig.customRequestBody);
    }
    // 如果导入的配置包含消息，也恢复消息
    if (importedConfig.messages && Array.isArray(importedConfig.messages)) {
      setMessage(importedConfig.messages);
    }
  }, []);

  const handleConfigReset = useCallback((options = {}) => {
    const { resetMessages = false } = options;

    setInputs(DEFAULT_CONFIG.inputs);
    setParameterEnabled(DEFAULT_CONFIG.parameterEnabled);
    setShowDebugPanel(DEFAULT_CONFIG.showDebugPanel);
    setCustomRequestMode(DEFAULT_CONFIG.customRequestMode);
    setCustomRequestBody(DEFAULT_CONFIG.customRequestBody);

    // 只有在明确指定时才重置消息
    if (resetMessages) {
      setMessage([]);
      setTimeout(() => {
        setMessage(DEFAULT_MESSAGES);
      }, 0);
    }
  }, []);

  // 清理定时器
  useEffect(() => {
    return () => {
      if (saveConfigTimeoutRef.current) {
        clearTimeout(saveConfigTimeoutRef.current);
      }
    };
  }, []);

  // 页面首次加载时，若最后一条消息仍处于 LOADING/INCOMPLETE 状态，自动修复
  useEffect(() => {
    if (!Array.isArray(message) || message.length === 0) return;

    const lastMsg = message[message.length - 1];
    if (lastMsg.status === MESSAGE_STATUS.LOADING || lastMsg.status === MESSAGE_STATUS.INCOMPLETE) {
      const processed = processIncompleteThinkTags(
        lastMsg.content || '',
        lastMsg.reasoningContent || ''
      );

      const fixedLastMsg = {
        ...lastMsg,
        status: MESSAGE_STATUS.COMPLETE,
        content: processed.content,
        reasoningContent: processed.reasoningContent || null,
        isThinkingComplete: true,
      };

      const updatedMessages = [...message.slice(0, -1), fixedLastMsg];
      setMessage(updatedMessages);

      // 保存修复后的消息列表
      setTimeout(() => saveMessagesImmediately(updatedMessages), 0);
    }
  }, []);

  return {
    // 配置状态
    inputs,
    parameterEnabled,
    showDebugPanel,
    customRequestMode,
    customRequestBody,

    // UI状态
    showSettings,
    models,
    groups,
    status,

    // 消息状态
    message,

    // 调试状态
    debugData,
    activeDebugTab,
    previewPayload,

    // 编辑状态
    editingMessageId,
    editValue,

    // Refs
    sseSourceRef,
    chatRef,
    saveConfigTimeoutRef,

    // 更新函数
    setInputs,
    setParameterEnabled,
    setShowDebugPanel,
    setCustomRequestMode,
    setCustomRequestBody,
    setShowSettings,
    setModels,
    setGroups,
    setStatus,
    setMessage,
    setDebugData,
    setActiveDebugTab,
    setPreviewPayload,
    setEditingMessageId,
    setEditValue,

    // 处理函数
    handleInputChange,
    handleParameterToggle,
    debouncedSaveConfig,
    saveMessagesImmediately,
    handleConfigImport,
    handleConfigReset,
  };
}; 