/**
 * Browser Hand State Management
 *
 * Zustand store for managing browser automation state, sessions, and execution.
 */

import { create } from 'zustand';
import { v4 as uuidv4 } from 'uuid';
import Browser, {
  createSession,
  closeSession,
  listSessions,
} from '../lib/browser-client';
import {
  BUILTIN_TEMPLATES,
  validateTemplateParams,
  mergeParamsWithDefaults,
  type TaskTemplate,
  type ExecutionState,
  type BrowserSession,
  type BrowserLog,
  type RecentTask,
  type SessionOptions,
  type LogLevel,
  type SessionStatus,
} from '../components/BrowserHand/templates';

// ============================================================================
// Store State Interface
// ============================================================================

interface BrowserHandState {
  // Sessions
  sessions: BrowserSession[];
  activeSessionId: string | null;

  // Execution
  execution: ExecutionState;

  // Logs
  logs: BrowserLog[];
  maxLogs: number;

  // Templates
  templates: TaskTemplate[];
  recentTasks: RecentTask[];
  maxRecentTasks: number;

  // UI State
  isTemplateModalOpen: boolean;
  isLoading: boolean;
  error: string | null;
}

interface BrowserHandActions {
  // Session Management
  createSession: (options?: SessionOptions) => Promise<string>;
  closeSession: (sessionId: string) => Promise<void>;
  listSessions: () => Promise<void>;
  setActiveSession: (sessionId: string | null) => void;

  // Template Execution
  executeTemplate: (templateId: string, params: Record<string, unknown>) => Promise<unknown>;
  executeScript: (script: string, args?: unknown[]) => Promise<unknown>;

  // State Updates
  updateExecutionState: (state: Partial<ExecutionState>) => void;
  addLog: (log: Omit<BrowserLog, 'id' | 'timestamp'>) => void;
  clearLogs: () => void;

  // Screenshot
  takeScreenshot: () => Promise<string>;

  // UI Control
  openTemplateModal: () => void;
  closeTemplateModal: () => void;
  setLoading: (loading: boolean) => void;
  setError: (error: string | null) => void;
  clearError: () => void;

  // Recent Tasks
  addRecentTask: (task: Omit<RecentTask, 'id' | 'executedAt'>) => void;
  clearRecentTasks: () => void;
}

// ============================================================================
// Initial State
// ============================================================================

const initialExecutionState: ExecutionState = {
  isRunning: false,
  currentAction: null,
  currentUrl: null,
  lastScreenshot: null,
  progress: 0,
  startTime: null,
  status: 'idle',
  error: null,
};

const initialState: BrowserHandState = {
  sessions: [],
  activeSessionId: null,
  execution: initialExecutionState,
  logs: [],
  maxLogs: 100,
  templates: BUILTIN_TEMPLATES,
  recentTasks: [],
  maxRecentTasks: 50,
  isTemplateModalOpen: false,
  isLoading: false,
  error: null,
};

// ============================================================================
// Store Implementation
// ============================================================================

export const useBrowserHandStore = create<BrowserHandState & BrowserHandActions>((set, get) => ({
  // State
  ...initialState,

  // Session Management
  createSession: async (options?: SessionOptions) => {
    const store = get();
    store.setLoading(true);
    store.clearError();

    try {
      store.addLog({ level: 'info', message: '正在创建浏览器会话...' });

      const result = await createSession({
        webdriverUrl: options?.webdriverUrl,
        headless: options?.headless ?? true,
        browserType: options?.browserType ?? 'chrome',
        windowWidth: options?.windowWidth,
        windowHeight: options?.windowHeight,
      });

      const sessionId = result.session_id;

      // Fetch session info
      const sessions = await listSessions();
      const sessionInfo = sessions.find(s => s.id === sessionId);

      const newSession: BrowserSession = {
        id: sessionId,
        name: `Browser ${sessionId.substring(0, 8)}`,
        currentUrl: sessionInfo?.current_url ?? null,
        title: sessionInfo?.title ?? null,
        status: (sessionInfo?.status as SessionStatus) ?? 'connected',
        createdAt: sessionInfo?.created_at ?? new Date().toISOString(),
        lastActivity: sessionInfo?.last_activity ?? new Date().toISOString(),
      };

      set((state) => ({
        sessions: [...state.sessions, newSession],
        activeSessionId: sessionId,
        isLoading: false,
      }));

      store.addLog({ level: 'info', message: `会话已创建: ${sessionId}` });

      return sessionId;
    } catch (error) {
      const errorMsg = error instanceof Error ? error.message : String(error);
      store.addLog({ level: 'error', message: `创建会话失败: ${errorMsg}` });
      set({ isLoading: false, error: errorMsg });
      throw error;
    }
  },

  closeSession: async (sessionId: string) => {
    const store = get();
    store.setLoading(true);

    try {
      await closeSession(sessionId);

      set((state) => ({
        sessions: state.sessions.filter(s => s.id !== sessionId),
        activeSessionId: state.activeSessionId === sessionId ? null : state.activeSessionId,
        isLoading: false,
      }));

      store.addLog({ level: 'info', message: `会话已关闭: ${sessionId}` });
    } catch (error) {
      const errorMsg = error instanceof Error ? error.message : String(error);
      store.addLog({ level: 'error', message: `关闭会话失败: ${errorMsg}` });
      set({ isLoading: false, error: errorMsg });
      throw error;
    }
  },

  listSessions: async () => {
    try {
      const sessions = await listSessions();

      const mappedSessions: BrowserSession[] = sessions.map(s => ({
        id: s.id,
        name: `Browser ${s.id.substring(0, 8)}`,
        currentUrl: s.current_url,
        title: s.title,
        status: s.status as SessionStatus,
        createdAt: s.created_at,
        lastActivity: s.last_activity,
      }));

      set({ sessions: mappedSessions });
    } catch (error) {
      console.error('[BrowserHand] Failed to list sessions:', error);
    }
  },

  setActiveSession: (sessionId: string | null) => {
    set({ activeSessionId: sessionId });
  },

  // Template Execution
  executeTemplate: async (templateId: string, params: Record<string, unknown>) => {
    const store = get();

    // Find template
    const template = store.templates.find(t => t.id === templateId);
    if (!template) {
      throw new Error(`Template not found: ${templateId}`);
    }

    // Validate params
    const validation = validateTemplateParams(template.params, params);
    if (!validation.valid) {
      const errorMessages = validation.errors.map(e => e.message).join(', ');
      throw new Error(`Invalid parameters: ${errorMessages}`);
    }

    // Merge with defaults
    const mergedParams = mergeParamsWithDefaults(template.params, params);

    // Initialize execution state
    const startTime = new Date().toISOString();
    set({
      execution: {
        ...initialExecutionState,
        isRunning: true,
        startTime,
        status: 'running',
      },
    });

    // Create browser instance
    const browser = new Browser();

    try {
      store.addLog({ level: 'info', message: `开始执行模板: ${template.name}` });

      // Start browser session
      await browser.start({ headless: true });

      // Create execution context
      const context = {
        browser,
        onProgress: (action: string, progress: number) => {
          store.updateExecutionState({ currentAction: action, progress });
          store.addLog({ level: 'action', message: action });
        },
        onLog: (level: LogLevel, message: string, details?: Record<string, unknown>) => {
          store.addLog({ level, message, details });
        },
      };

      // Execute template
      const result = await template.execute(mergedParams, context);

      // Update state on success
      set((state) => ({
        execution: {
          ...state.execution,
          isRunning: false,
          progress: 100,
          status: 'success',
        },
      }));

      // Add to recent tasks
      const duration = Date.now() - new Date(startTime).getTime();
      store.addRecentTask({
        templateId: template.id,
        templateName: template.name,
        params: mergedParams,
        status: 'success',
        duration,
        result,
      });

      store.addLog({ level: 'info', message: `模板执行完成: ${template.name}` });

      return result;
    } catch (error) {
      const errorMsg = error instanceof Error ? error.message : String(error);

      set((state) => ({
        execution: {
          ...state.execution,
          isRunning: false,
          status: 'error',
          error: errorMsg,
        },
      }));

      // Add failed task
      const duration = Date.now() - new Date(startTime).getTime();
      store.addRecentTask({
        templateId: template.id,
        templateName: template.name,
        params: mergedParams,
        status: 'failed',
        duration,
        error: errorMsg,
      });

      store.addLog({ level: 'error', message: `模板执行失败: ${errorMsg}` });

      throw error;
    } finally {
      await browser.close();
    }
  },

  executeScript: async (script: string, args?: unknown[]) => {
    const store = get();

    if (!store.activeSessionId) {
      throw new Error('No active browser session');
    }

    store.updateExecutionState({
      isRunning: true,
      currentAction: 'Executing script...',
      status: 'running',
    });

    try {
      const browser = new Browser();
      await browser.start();

      const result = await browser.eval(script, args);

      store.updateExecutionState({
        isRunning: false,
        status: 'success',
      });

      return result;
    } catch (error) {
      const errorMsg = error instanceof Error ? error.message : String(error);
      store.updateExecutionState({
        isRunning: false,
        status: 'error',
        error: errorMsg,
      });
      throw error;
    }
  },

  // State Updates
  updateExecutionState: (state: Partial<ExecutionState>) => {
    set((prev) => ({
      execution: { ...prev.execution, ...state },
    }));
  },

  addLog: (log: Omit<BrowserLog, 'id' | 'timestamp'>) => {
    const newLog: BrowserLog = {
      ...log,
      id: uuidv4(),
      timestamp: new Date().toISOString(),
    };

    set((state) => {
      const logs = [...state.logs, newLog];
      // Trim logs if exceeding max
      if (logs.length > state.maxLogs) {
        return { logs: logs.slice(-state.maxLogs) };
      }
      return { logs };
    });
  },

  clearLogs: () => {
    set({ logs: [] });
  },

  // Screenshot
  takeScreenshot: async () => {
    const store = get();

    if (!store.activeSessionId) {
      throw new Error('No active browser session');
    }

    try {
      const browser = new Browser();
      await browser.start();

      const result = await browser.screenshot();

      set((state) => ({
        execution: {
          ...state.execution,
          lastScreenshot: result.base64,
        },
      }));

      store.addLog({ level: 'info', message: 'Screenshot captured' });

      return result.base64;
    } catch (error) {
      const errorMsg = error instanceof Error ? error.message : String(error);
      store.addLog({ level: 'error', message: `Screenshot failed: ${errorMsg}` });
      throw error;
    }
  },

  // UI Control
  openTemplateModal: () => {
    set({ isTemplateModalOpen: true });
  },

  closeTemplateModal: () => {
    set({ isTemplateModalOpen: false });
  },

  setLoading: (loading: boolean) => {
    set({ isLoading: loading });
  },

  setError: (error: string | null) => {
    set({ error });
  },

  clearError: () => {
    set({ error: null });
  },

  // Recent Tasks
  addRecentTask: (task: Omit<RecentTask, 'id' | 'executedAt'>) => {
    const newTask: RecentTask = {
      ...task,
      id: uuidv4(),
      executedAt: new Date().toISOString(),
    };

    set((state) => {
      const recentTasks = [newTask, ...state.recentTasks];
      // Trim if exceeding max
      if (recentTasks.length > state.maxRecentTasks) {
        return { recentTasks: recentTasks.slice(0, state.maxRecentTasks) };
      }
      return { recentTasks };
    });
  },

  clearRecentTasks: () => {
    set({ recentTasks: [] });
  },
}));

// ============================================================================
// Selector Hooks
// ============================================================================

export const useActiveSession = () =>
  useBrowserHandStore((state) => {
    if (!state.activeSessionId) return null;
    return state.sessions.find(s => s.id === state.activeSessionId) ?? null;
  });

export const useExecutionState = () =>
  useBrowserHandStore((state) => state.execution);

export const useIsRunning = () =>
  useBrowserHandStore((state) => state.execution.isRunning);

export const useTemplates = () =>
  useBrowserHandStore((state) => state.templates);

export const useTemplatesByCategory = (category: string) =>
  useBrowserHandStore((state) =>
    state.templates.filter(t => t.category === category)
  );

export const useRecentTasks = () =>
  useBrowserHandStore((state) => state.recentTasks);

export const useLogs = () =>
  useBrowserHandStore((state) => state.logs);