/**
 * IPC App Handlers — 应用工具域（P2-9 从 handlers.ts 拆分）
 *
 * 版本/路径查询、外部链接、文件夹选择、重启、SearXNG 连接测试、
 * 审计日志链验证/查询、渲染进程错误上报（P0-3 修复断链）。
 */

import { ipcMain, shell, app, dialog } from 'electron';
import type { IPCContext } from './context';
import type { AuditEventType } from '../services/audit.service';
import log from 'electron-log';

export function registerAppHandlers(ctx: IPCContext): void {
  const { mainWindow, auditService } = ctx;

  ipcMain.handle('app:getVersion', async () => {
    return app.getVersion();
  });

  ipcMain.handle('app:getAppDataPath', async () => {
    return app.getPath('userData');
  });

  ipcMain.handle('app:openExternal', async (_event, url: unknown) => {
    // M-12 修复: URL 协议白名单校验，防止打开 file:///smb:// 等危险协议
    if (typeof url !== 'string' || !url) {
      return { success: false, error: 'Invalid URL' };
    }
    try {
      const parsed = new URL(url);
      const ALLOWED_PROTOCOLS = ['http:', 'https:', 'mailto:'];
      if (!ALLOWED_PROTOCOLS.includes(parsed.protocol)) {
        log.warn(`[IPC] openExternal blocked: protocol "${parsed.protocol}" not in whitelist`);
        return { success: false, error: `Protocol not allowed: ${parsed.protocol}` };
      }
      await shell.openExternal(url);
      return { success: true };
    } catch (error) {
      log.warn('[IPC] openExternal failed:', (error as Error).message);
      return { success: false, error: (error as Error).message };
    }
  });

  ipcMain.handle('app:showItemInFolder', async (_event, path: unknown) => {
    // M-36 修复: path 类型校验
    if (typeof path !== 'string' || !path) {
      return { success: false, error: 'Invalid path' };
    }
    try {
      shell.showItemInFolder(path);
      return { success: true };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });

  ipcMain.handle('app:selectFolder', async (_event, defaultPath?: string) => {
    const result = await dialog.showOpenDialog(mainWindow, {
      properties: ['openDirectory', 'createDirectory'],
      defaultPath: defaultPath ?? app.getPath('home'),
      title: '选择工作空间目录',
    });
    if (result.canceled || result.filePaths.length === 0) return { canceled: true, path: '' };
    return { canceled: false, path: result.filePaths[0] };
  });

  // 重启应用（工作空间切换后调用）
  ipcMain.handle('app:restart', async () => {
    log.info('[APP] Restart requested');
    // 延迟 200ms 让 IPC 响应先返回
    setTimeout(() => {
      app.relaunch();
      app.exit(0);
    }, 200);
    return { success: true };
  });

  // ===== P0-3 修复: 渲染进程错误上报通道（原 preload 发送端存在但主进程无 handler，上报被静默丢弃） =====
  ipcMain.on('error:report', (_event, payload: unknown) => {
    try {
      if (!payload || typeof payload !== 'object') return;
      const p = payload as Record<string, unknown>;
      // 截断超长字段（stack 可达数十 KB），防止日志膨胀
      const truncateStr = (v: unknown, max = 4000): unknown =>
        typeof v === 'string' ? v.slice(0, max) : v;
      const details = {
        type: truncateStr(p.type, 100),
        error: truncateStr(p.error, 1000),
        stack: truncateStr(p.stack),
        componentStack: truncateStr(p.componentStack, 4000),
        timestamp: p.timestamp,
      };
      log.error('[Renderer Error]', JSON.stringify(details));
      // 同步写入审计日志（TOOL 层），便于事后追溯
      auditService.log({
        sessionId: '',
        eventType: 'error',
        actor: 'user',
        target: 'renderer',
        details,
        outcome: 'error',
      });
    } catch (err) {
      // 错误上报自身失败仅记录，不抛出（单向通道无响应方）
      log.warn('[IPC] error:report handler failed:', err);
    }
  });

  // ===== SearXNG 连接测试 =====

  ipcMain.handle(
    'searxng:testConnection',
    async (_event, url: string, authKey: string, authType: string) => {
      try {
        if (!url || !/^https?:\/\//.test(url)) {
          return { success: false, error: 'URL 需以 http:// 或 https:// 开头' };
        }

        const startTime = Date.now();
        const headers: Record<string, string> = {};

        if (authKey) {
          if (authType === 'bearer') {
            headers['Authorization'] = `Bearer ${authKey}`;
          } else if (authType === 'basic') {
            headers['Authorization'] = `Basic ${Buffer.from(authKey).toString('base64')}`;
          }
        }

        const testUrl = `${url.replace(/\/$/, '')}/search?q=test&format=json&pageno=1`;
        const response = await fetch(testUrl, {
          headers,
          signal: AbortSignal.timeout(10_000),
        });

        const latencyMs = Date.now() - startTime;

        if (response.ok) {
          return { success: true, statusCode: response.status, latencyMs };
        }
        return {
          success: false,
          statusCode: response.status,
          latencyMs,
          error: `HTTP ${response.status} ${response.statusText}`,
        };
      } catch (error) {
        return { success: false, error: (error as Error).message };
      }
    },
  );

  // ===== v0.2.0: 审计日志链式哈希验证 =====

  ipcMain.handle('audit:verifyChain', async () => {
    try {
      const result = auditService.verifyChain();
      log.info(
        `[AUDIT] Chain verification: ${result.valid ? 'valid' : 'TAMPERED'} (${result.verifiedRecords}/${result.totalRecords})`,
      );
      return { success: true, ...result };
    } catch (error) {
      log.error('[AUDIT] Chain verification failed:', error);
      return { success: false, error: (error as Error).message };
    }
  });

  // v0.5.0: 审计日志导出（JSONL / CSV 两种格式）
  ipcMain.handle('audit:export', async (_event, format: unknown) => {
    const fmt = format === 'csv' ? 'csv' : 'jsonl';
    try {
      const content = fmt === 'csv' ? auditService.exportCSV() : auditService.exportJSONL();
      const recordCount = content.trim()
        ? fmt === 'csv'
          ? content.trim().split('\n').length - 1
          : content.trim().split('\n').length
        : 0;
      log.info(`[AUDIT] Exported ${recordCount} records as ${fmt.toUpperCase()}`);
      return { success: true, data: content, format: fmt, recordCount };
    } catch (error) {
      log.error('[AUDIT] Export failed:', error);
      return { success: false, error: (error as Error).message };
    }
  });

  ipcMain.handle('audit:query', async (_event, filters?: unknown) => {
    // M-45 修复: 校验 filters 参数类型和范围
    const VALID_AUDIT_EVENT_TYPES: readonly AuditEventType[] = [
      'tool_call',
      'permission_check',
      'error',
      'llm_request',
      'llm_response',
      'session_start',
      'session_end',
      'config_change',
    ];
    const safeFilters: { sessionId?: string; eventType?: AuditEventType; limit?: number } = {};
    if (filters && typeof filters === 'object') {
      const f = filters as Record<string, unknown>;
      if (typeof f.sessionId === 'string' && f.sessionId) safeFilters.sessionId = f.sessionId;
      if (typeof f.eventType === 'string' && f.eventType) {
        // 校验 eventType 是否在合法枚举内
        if (!(VALID_AUDIT_EVENT_TYPES as readonly string[]).includes(f.eventType)) {
          return {
            success: false,
            error: `Invalid eventType (must be one of: ${VALID_AUDIT_EVENT_TYPES.join(', ')})`,
          };
        }
        safeFilters.eventType = f.eventType as AuditEventType;
      }
      if (f.limit !== undefined) {
        const limit = Number(f.limit);
        // 限制 1-1000 范围，防止过大查询拖慢性能
        if (!Number.isFinite(limit) || limit < 1 || limit > 1000) {
          return { success: false, error: 'Invalid limit (must be 1-1000)' };
        }
        safeFilters.limit = Math.floor(limit);
      }
    }
    try {
      return { success: true, data: auditService.query(safeFilters) };
    } catch (error) {
      return { success: false, error: (error as Error).message };
    }
  });
}