import { logger } from '../../utils/logger';
import { getServiceOrThrow, getServiceOptional } from './service-registry';
import type { IdeConfigResult } from '../../server/modules/proxy/proxy-ide-config.service';
import { TrafficLogsRepo } from '../database/proxyMetricsHandler';
import { CloudAccountRepo } from '../database/cloudHandler';
import { ConfigManager } from '../config/manager';
import { networkInterfaces } from 'os';

export interface TrafficLogEntryParsed {
  timestamp: string;
  direction: string;
  requestId: string;
  endpoint: string;
  method?: string;
  status?: number;
  headers?: Record<string, unknown>;
  body?: unknown;
  chunk?: unknown;
  durationMs?: number;
  error?: {
    message: string;
    stack?: string;
    status?: number;
    body?: unknown;
  };
  metadata?: Record<string, unknown>;
}

function normalizeServiceError(error: unknown): string {
  if (error instanceof Error && error.message.includes('is not registered')) {
    return 'Proxy advanced service not initialized';
  }
  return error instanceof Error ? error.message : String(error);
}

export async function getRecentTrafficLogs(
  limit: number = 50,
  direction?: string,
): Promise<{ success: boolean; data?: TrafficLogEntryParsed[]; error?: string }> {
  try {
    const rows = TrafficLogsRepo.getRecent(limit, direction);
    const entries: TrafficLogEntryParsed[] = rows.map((r) => ({
      timestamp: new Date(r.timestamp).toISOString(),
      direction: r.direction,
      requestId: r.requestId,
      endpoint: r.endpoint,
      method: r.method,
      status: r.status,
      headers: r.headers,
      body: r.body,
      chunk: r.chunk,
      durationMs: r.durationMs,
      error: r.error,
      metadata: r.metadata,
    }));

    return { success: true, data: entries };
  } catch (error) {
    logger.error('Failed to get recent traffic logs', error);
    return { success: false, error: error instanceof Error ? error.message : String(error) };
  }
}

export async function getTrafficLogStats(): Promise<{
  success: boolean;
  data?: { byDirection: Record<string, number>; byEndpoint: Record<string, number>; total: number };
  error?: string;
}> {
  try {
    const stats = TrafficLogsRepo.getStats();
    return { success: true, data: stats };
  } catch (error) {
    logger.error('Failed to get traffic log stats', error);
    return { success: false, error: error instanceof Error ? error.message : String(error) };
  }
}

export async function exportTrafficLogs(
  format: 'json' | 'csv',
): Promise<{ success: boolean; data?: string; error?: string }> {
  try {
    const rows = TrafficLogsRepo.getAllForExport();

    if (format === 'json') {
      return { success: true, data: JSON.stringify(rows, null, 2) };
    }

    // CSV format
    const headers = [
      'timestamp',
      'direction',
      'requestId',
      'endpoint',
      'method',
      'status',
      'durationMs',
    ];
    const rowsCsv = rows.map((e) =>
      [
        new Date(e.timestamp).toISOString(),
        e.direction,
        e.requestId,
        e.endpoint,
        e.method || '',
        e.status != null ? e.status : '',
        e.durationMs != null ? e.durationMs : '',
      ]
        .map((v) => `"${String(v).replace(/"/g, '""')}"`)
        .join(','),
    );

    return { success: true, data: [headers.join(','), ...rowsCsv].join('\n') };
  } catch (error) {
    logger.error('Failed to export traffic logs', error);
    return { success: false, error: error instanceof Error ? error.message : String(error) };
  }
}

export async function getParityCounters(): Promise<{
  success: boolean;
  data?: {
    totalRequests: number;
    matchedRequests: number;
    parityViolations: number;
    lastUpdated: string;
  };
  error?: string;
}> {
  try {
    const tokenManager = getServiceOptional('tokenManager');
    if (!tokenManager) {
      return {
        success: true,
        data: {
          totalRequests: 0,
          matchedRequests: 0,
          parityViolations: 0,
          lastUpdated: new Date().toISOString(),
        },
      };
    }
    return {
      success: true,
      data: tokenManager.getParityCounters(),
    };
  } catch (error) {
    return { success: false, error: normalizeServiceError(error) };
  }
}

export async function getCircuitBreakerStatus(): Promise<{
  success: boolean;
  data?: {
    states: Record<string, { state: string; failures: number; lastFailure: string | null }>;
    globalEnabled: boolean;
  };
  error?: string;
}> {
  try {
    const tokenManager = getServiceOptional('tokenManager');
    if (!tokenManager) {
      return {
        success: true,
        data: { states: {}, globalEnabled: true },
      };
    }

    const rawStatus = tokenManager.getCircuitBreakerStatus();
    const states: Record<string, { state: string; failures: number; lastFailure: string | null }> =
      {};
    for (const [accountId, entry] of Object.entries(rawStatus)) {
      states[accountId] = {
        state: entry.state,
        failures: entry.failureCount,
        lastFailure: entry.lastFailureTime ? new Date(entry.lastFailureTime).toISOString() : null,
      };
    }

    return {
      success: true,
      data: {
        states,
        globalEnabled: true,
      },
    };
  } catch (error) {
    return { success: false, error: normalizeServiceError(error) };
  }
}

export async function getProxyMetrics(): Promise<{
  success: boolean;
  data?: {
    uptimeSeconds: number;
    totalRequests: number;
    activeConnections: number;
    avgLatency: number;
    errorRate: number;
    requestsPerMinute: number;
    cacheHitRate: number;
  };
  error?: string;
}> {
  try {
    const proxyMetrics = getServiceOptional('proxyMetrics');
    if (!proxyMetrics) {
      return {
        success: true,
        data: {
          uptimeSeconds: 0,
          totalRequests: 0,
          activeConnections: 0,
          avgLatency: 0,
          errorRate: 0,
          requestsPerMinute: 0,
          cacheHitRate: 0,
        },
      };
    }

    const metrics = proxyMetrics.getMetrics();
    return {
      success: true,
      data: {
        uptimeSeconds: Math.floor(process.uptime()),
        totalRequests: metrics.totalRequests,
        activeConnections: metrics.activeConnections,
        avgLatency: metrics.avgLatency,
        errorRate: metrics.errorRate,
        requestsPerMinute: metrics.requestsPerMinute,
        cacheHitRate: metrics.cacheHitRate,
      },
    };
  } catch (error) {
    logger.error('Failed to get proxy metrics', error);
    return { success: false, error: normalizeServiceError(error) };
  }
}

export async function getRecentRequests(): Promise<{
  success: boolean;
  data?: unknown[];
  error?: string;
}> {
  try {
    const proxyReplay = getServiceOptional('proxyReplay');
    if (!proxyReplay) return { success: true, data: [] };
    return {
      success: true,
      data: proxyReplay.getRecentRequests(20),
    };
  } catch (error) {
    return { success: false, error: normalizeServiceError(error) };
  }
}

export async function replayRequest(requestId: string): Promise<{
  success: boolean;
  data?: { original: unknown; newResponse: unknown };
  error?: string;
}> {
  try {
    const proxyReplay = getServiceOrThrow('proxyReplay');
    const result = await proxyReplay.replayRequest(requestId);
    return { success: true, data: result };
  } catch (error) {
    return { success: false, error: normalizeServiceError(error) };
  }
}

export interface ModelCapabilityEntry {
  id: string;
  object: string;
  displayName?: string;
  capabilities: {
    vision: boolean;
    thinking: boolean;
    streaming: boolean;
    jsonMode: boolean;
    recommended: boolean;
  };
  limits: {
    maxTokens?: number;
    maxOutputTokens?: number;
    thinkingBudget?: number;
  };
}

export async function getModelCapabilities(): Promise<{
  success: boolean;
  data?: ModelCapabilityEntry[];
  error?: string;
}> {
  try {
    const accounts = await CloudAccountRepo.getAccounts();

    const modelMap = new Map<string, ModelCapabilityEntry>();

    for (const account of accounts) {
      if (!account.quota || !account.quota.models) {
        continue;
      }

      for (const [modelId, modelInfo] of Object.entries(account.quota.models)) {
        if (modelMap.has(modelId)) {
          continue;
        }

        modelMap.set(modelId, {
          id: modelId,
          object: 'model',
          displayName: modelInfo.display_name,
          capabilities: {
            vision: modelInfo.supports_images ?? false,
            thinking: modelInfo.supports_thinking ?? false,
            streaming: true,
            jsonMode: true,
            recommended: modelInfo.recommended ?? false,
          },
          limits: {
            maxTokens: modelInfo.max_tokens,
            maxOutputTokens: modelInfo.max_output_tokens,
            thinkingBudget: modelInfo.thinking_budget,
          },
        });
      }
    }

    const data = Array.from(modelMap.values()).sort((a, b) => a.id.localeCompare(b.id));

    return { success: true, data };
  } catch (error) {
    logger.error('Failed to get model capabilities', error);
    return { success: false, error: error instanceof Error ? error.message : String(error) };
  }
}

function mapIdeConfigResult(result: IdeConfigResult): {
  name: string;
  settingsPath: string;
  proxySetting?: string;
  apiKeySetting?: string;
  instructions?: string;
  format: 'json' | 'shell' | 'env' | 'instructions';
  content: Record<string, unknown> | string;
} {
  switch (result.ide) {
    case 'vscode':
      return {
        name: 'VS Code',
        settingsPath: 'settings.json',
        proxySetting: 'openai.url',
        apiKeySetting: 'openai.apiKey',
        instructions: 'Add these settings to your VS Code settings.json',
        format: result.format,
        content: result.content as Record<string, unknown>,
      };
    case 'cursor':
      return {
        name: 'Cursor',
        settingsPath: 'settings.json',
        proxySetting: 'OPENAI_BASE_URL',
        apiKeySetting: 'OPENAI_API_KEY',
        instructions: 'Set these environment variables for Cursor',
        format: result.format,
        content: result.content as Record<string, unknown>,
      };
    case 'claude-code':
      return {
        name: 'Claude Code',
        settingsPath: 'Shell environment',
        proxySetting: 'ANTHROPIC_BASE_URL',
        apiKeySetting: 'ANTHROPIC_API_KEY',
        instructions: 'Run these export commands before starting Claude Code',
        format: result.format,
        content: result.content as string,
      };
    case 'jetbrains':
      return {
        name: 'JetBrains',
        settingsPath: 'IDE Settings',
        proxySetting: 'Base URL',
        apiKeySetting: 'API Key',
        instructions: String(result.content),
        format: result.format,
        content: result.content as string,
      };
    case 'opencide':
      return {
        name: 'Opencide',
        settingsPath: '.env',
        proxySetting: 'OPENAI_BASE_URL',
        apiKeySetting: 'OPENAI_API_KEY',
        instructions: 'Add these lines to your .env file',
        format: result.format,
        content: result.content as string,
      };
    case 'opencode':
      return {
        name: 'OpenCode',
        settingsPath: '.config/opencode/providers.json',
        instructions: 'Add this snippet to your providers.json',
        format: result.format,
        content: result.content as Record<string, unknown>,
      };
    default: {
      const exhaustiveCheck: never = result.ide as never;
      throw new Error(`Unsupported IDE: ${String(exhaustiveCheck)}`);
    }
  }
}

export async function generateIdeConfig(
  ide: string,
  defaultModel?: string,
): Promise<{
  success: boolean;
  data?: {
    name: string;
    settingsPath: string;
    proxySetting?: string;
    apiKeySetting?: string;
    instructions?: string;
    format: 'json' | 'shell' | 'env' | 'instructions';
    content: Record<string, unknown> | string;
  };
  error?: string;
}> {
  try {
    const supportedIdes = [
      'cursor',
      'vscode',
      'claude-code',
      'jetbrains',
      'opencide',
      'opencode',
    ] as const;
    const normalizedIde = ide.toLowerCase() as (typeof supportedIdes)[number];
    if (!supportedIdes.includes(normalizedIde)) {
      return { success: false, error: `Unsupported IDE: ${ide}` };
    }

    // Attempt to use NestJS service if running, fallback to manual generation
    const proxyIdeConfig = getServiceOptional('proxyIdeConfig');
    if (proxyIdeConfig) {
      const result = proxyIdeConfig.generateConfigForCurrentServer(normalizedIde, defaultModel);
      if (result) return { success: true, data: mapIdeConfigResult(result) };
    }

    // Fallback logic when proxy is stopped
    const config = ConfigManager.getCachedConfig()?.proxy;
    const port = config?.port || 8045;
    const apiKey = config?.api_key || 'YOUR_API_KEY';

    let localIp = '127.0.0.1';
    const interfaces = networkInterfaces();
    for (const iface of Object.values(interfaces)) {
      if (iface) {
        for (const entry of iface) {
          if (entry.family === 'IPv4' && !entry.internal) {
            localIp = entry.address;
            break;
          }
        }
      }
    }

    // Fallback generator mimicking the proxyIdeConfig.service
    const baseUrl = `http://${localIp}:${port}/v1`;
    let result: IdeConfigResult;

    switch (normalizedIde) {
      case 'cursor':
        result = {
          ide: normalizedIde,
          format: 'json',
          content: { OPENAI_API_KEY: apiKey, OPENAI_BASE_URL: baseUrl },
        };
        break;
      case 'vscode':
        result = {
          ide: normalizedIde,
          format: 'json',
          content: { 'openai.url': baseUrl, 'openai.apiKey': apiKey },
        };
        break;
      case 'claude-code':
        result = {
          ide: normalizedIde,
          format: 'shell',
          content: `export OPENAI_API_KEY=${apiKey} && export OPENAI_BASE_URL=${baseUrl}`,
        };
        break;
      case 'jetbrains':
        result = {
          ide: normalizedIde,
          format: 'instructions',
          content: [
            'JetBrains AI Assistant Setup:',
            '1. Open Settings (File > Settings or Ctrl+Alt+S).',
            '2. Navigate to Languages & Frameworks > AI Assistant.',
            '3. Under "Custom OpenAI Endpoint", set:',
            `   - Base URL: ${baseUrl}`,
            `   - API Key: ${apiKey}`,
            '4. Click "Apply" and restart the IDE if prompted.',
          ].join('\n'),
        };
        break;
      case 'opencide':
        result = {
          ide: normalizedIde,
          format: 'env',
          content: `OPENAI_API_KEY=${apiKey}\nOPENAI_BASE_URL=${baseUrl}`,
        };
        break;
      case 'opencode':
        result = {
          ide: normalizedIde,
          format: 'json',
          content: {
            apiType: 'openai',
            apiKey: apiKey,
            baseURL: baseUrl,
            models: { chat: [defaultModel || 'gemini-3.1-pro-high'] },
          },
        };
        break;
      default:
        throw new Error('Unsupported');
    }

    return {
      success: true,
      data: mapIdeConfigResult(result),
    };
  } catch (error) {
    return { success: false, error: normalizeServiceError(error) };
  }
}