import {
  Controller,
  Post,
  Body,
  Headers,
  Req,
  Logger,
  HttpException,
} from '@nestjs/common';
import type { Request } from 'express';
import { ConfigService } from '@nestjs/config';
import axios from 'axios';
import { OzonetelAgentService } from '../ozonetel/ozonetel-agent.service';
import { SessionService } from './session.service';
import { AgentConfigService } from './agent-config.service';

@Controller('auth')
export class AuthController {
  private readonly logger = new Logger(AuthController.name);
  private readonly graphqlUrl: string;
  private readonly workspaceSubdomain: string;
  private readonly origin: string;

  constructor(
    private config: ConfigService,
    private ozonetelAgent: OzonetelAgentService,
    private sessionService: SessionService,
    private agentConfigService: AgentConfigService,
  ) {
    this.graphqlUrl = config.get<string>('platform.graphqlUrl')!;
    this.workspaceSubdomain =
      process.env.PLATFORM_WORKSPACE_SUBDOMAIN ?? 'fortytwo-dev';
    this.origin =
      process.env.PLATFORM_ORIGIN ?? 'http://fortytwo-dev.localhost:4010';
  }

  @Post('login')
  async login(
    @Body() body: { email: string; password: string },
    @Req() req: Request,
  ) {
    this.logger.log(`Login attempt for ${body.email}`);

    try {
      // Step 1: Get login token
      const loginRes = await axios.post(
        this.graphqlUrl,
        {
          query: `mutation GetLoginToken($email: String!, $password: String!) {
                    getLoginTokenFromCredentials(
                        email: $email
                        password: $password
                        origin: "${this.origin}"
                    ) {
                        loginToken { token }
                    }
                }`,
          variables: { email: body.email, password: body.password },
        },
        {
          headers: {
            'Content-Type': 'application/json',
            'X-Workspace-Subdomain': this.workspaceSubdomain,
          },
        },
      );

      if (loginRes.data.errors) {
        throw new HttpException(
          loginRes.data.errors[0]?.message ?? 'Login failed',
          401,
        );
      }

      const loginToken =
        loginRes.data.data.getLoginTokenFromCredentials.loginToken.token;

      // Step 2: Exchange for access + refresh tokens
      const tokenRes = await axios.post(
        this.graphqlUrl,
        {
          query: `mutation GetAuthTokens($loginToken: String!) {
                    getAuthTokensFromLoginToken(
                        loginToken: $loginToken
                        origin: "${this.origin}"
                    ) {
                        tokens {
                            accessOrWorkspaceAgnosticToken { token }
                            refreshToken { token }
                        }
                    }
                }`,
          variables: { loginToken },
        },
        {
          headers: {
            'Content-Type': 'application/json',
            'X-Workspace-Subdomain': this.workspaceSubdomain,
          },
        },
      );

      if (tokenRes.data.errors) {
        throw new HttpException(
          tokenRes.data.errors[0]?.message ?? 'Token exchange failed',
          401,
        );
      }

      const tokens = tokenRes.data.data.getAuthTokensFromLoginToken.tokens;
      const accessToken = tokens.accessOrWorkspaceAgnosticToken.token;

      // Step 3: Fetch user profile with roles
      const profileRes = await axios.post(
        this.graphqlUrl,
        {
          query: `{ currentUser { id email workspaceMember { id name { firstName lastName } userEmail avatarUrl roles { id label } } } }`,
        },
        {
          headers: {
            'Content-Type': 'application/json',
            Authorization: `Bearer ${accessToken}`,
          },
        },
      );

      const currentUser = profileRes.data?.data?.currentUser;
      const workspaceMember = currentUser?.workspaceMember;
      const roles = workspaceMember?.roles ?? [];
      const roleLabels = roles.map((r: any) => r.label);

      // Determine app role from platform roles
      let appRole = 'executive'; // default
      if (roleLabels.includes('HelixEngage Manager')) {
        appRole = 'admin';
      } else if (roleLabels.includes('HelixEngage User')) {
        // Distinguish CC agent from executive by email convention or config
        // For now, emails containing 'cc' map to cc-agent
        const email = workspaceMember?.userEmail ?? body.email;
        appRole = email.includes('cc') ? 'cc-agent' : 'executive';
      }

      this.logger.log(
        `User ${body.email} logged in with role: ${appRole} (platform roles: ${roleLabels.join(', ')})`,
      );

      // Multi-agent: resolve agent config + session lock for CC agents
      let agentConfigResponse: any = undefined;

      if (appRole === 'cc-agent') {
        const memberId = workspaceMember?.id;
        if (!memberId)
          throw new HttpException('Workspace member not found', 400);

        const agentConfig =
          await this.agentConfigService.getByMemberId(memberId);
        if (!agentConfig) {
          throw new HttpException(
            'Agent account not configured. Contact administrator.',
            403,
          );
        }

        // Check for duplicate login — strict: one device only
        const clientIp =
          (req.headers['x-forwarded-for'] as string)?.split(',')[0]?.trim() ??
          req.ip ??
          'unknown';
        const existingSession = await this.sessionService.getSession(
          agentConfig.ozonetelAgentId,
        );
        if (existingSession) {
          this.logger.warn(
            `Duplicate login blocked for ${body.email} — session held by IP ${existingSession.ip} since ${existingSession.lockedAt}`,
          );
          throw new HttpException(
            `You are already logged in from another device (${existingSession.ip}). Please log out there first.`,
            409,
          );
        }

        // Lock session in Redis with IP
        await this.sessionService.lockSession(
          agentConfig.ozonetelAgentId,
          memberId,
          clientIp,
        );

        // Force-refresh Ozonetel API token on login
        this.ozonetelAgent.refreshToken().catch((err) => {
          this.logger.warn(
            `Ozonetel token refresh on login failed: ${err.message}`,
          );
        });

        // Login to Ozonetel with agent-specific credentials
        const ozAgentPassword =
          process.env.OZONETEL_AGENT_PASSWORD ?? 'Test123$';
        this.ozonetelAgent
          .loginAgent({
            agentId: agentConfig.ozonetelAgentId,
            password: ozAgentPassword,
            phoneNumber: agentConfig.sipExtension,
            mode: 'blended',
          })
          .catch((err) => {
            this.logger.warn(
              `Ozonetel agent login failed (non-blocking): ${err.message}`,
            );
          });

        agentConfigResponse = {
          ozonetelAgentId: agentConfig.ozonetelAgentId,
          sipExtension: agentConfig.sipExtension,
          sipPassword: agentConfig.sipPassword,
          sipUri: agentConfig.sipUri,
          sipWsServer: agentConfig.sipWsServer,
          campaignName: agentConfig.campaignName,
        };

        this.logger.log(
          `CC agent ${body.email} → Ozonetel ${agentConfig.ozonetelAgentId} / SIP ${agentConfig.sipExtension}`,
        );
      }

      return {
        accessToken,
        refreshToken: tokens.refreshToken.token,
        user: {
          id: currentUser?.id,
          email: currentUser?.email,
          firstName: workspaceMember?.name?.firstName ?? '',
          lastName: workspaceMember?.name?.lastName ?? '',
          avatarUrl: workspaceMember?.avatarUrl,
          role: appRole,
          platformRoles: roleLabels,
        },
        ...(agentConfigResponse ? { agentConfig: agentConfigResponse } : {}),
      };
    } catch (error) {
      if (error instanceof HttpException) throw error;
      this.logger.error(`Login proxy failed: ${error}`);
      throw new HttpException('Authentication service unavailable', 503);
    }
  }

  @Post('refresh')
  async refresh(@Body() body: { refreshToken: string }) {
    if (!body.refreshToken) {
      throw new HttpException('refreshToken required', 400);
    }

    this.logger.log('Token refresh request');

    try {
      const res = await axios.post(
        this.graphqlUrl,
        {
          query: `mutation RefreshToken($token: String!) {
                    renewToken(appToken: $token) {
                        tokens {
                            accessOrWorkspaceAgnosticToken { token expiresAt }
                            refreshToken { token }
                        }
                    }
                }`,
          variables: { token: body.refreshToken },
        },
        {
          headers: { 'Content-Type': 'application/json' },
        },
      );

      if (res.data.errors) {
        this.logger.warn(
          `Token refresh failed: ${res.data.errors[0]?.message}`,
        );
        throw new HttpException('Token refresh failed', 401);
      }

      const tokens = res.data.data.renewToken.tokens;
      return {
        accessToken: tokens.accessOrWorkspaceAgnosticToken.token,
        refreshToken: tokens.refreshToken.token,
      };
    } catch (error) {
      if (error instanceof HttpException) throw error;
      this.logger.error(`Token refresh failed: ${error}`);
      throw new HttpException('Token refresh failed', 401);
    }
  }

  @Post('logout')
  async logout(@Headers('authorization') auth: string) {
    if (!auth) return { status: 'ok' };

    try {
      const profileRes = await axios.post(
        this.graphqlUrl,
        {
          query: '{ currentUser { workspaceMember { id } } }',
        },
        {
          headers: { 'Content-Type': 'application/json', Authorization: auth },
        },
      );

      const memberId = profileRes.data?.data?.currentUser?.workspaceMember?.id;
      if (!memberId) return { status: 'ok' };

      const agentConfig = this.agentConfigService.getFromCache(memberId);
      if (agentConfig) {
        await this.sessionService.unlockSession(agentConfig.ozonetelAgentId);
        this.logger.log(`Session unlocked for ${agentConfig.ozonetelAgentId}`);

        this.ozonetelAgent
          .logoutAgent({
            agentId: agentConfig.ozonetelAgentId,
            password: process.env.OZONETEL_AGENT_PASSWORD ?? 'Test123$',
          })
          .catch((err) =>
            this.logger.warn(`Ozonetel logout failed: ${err.message}`),
          );

        this.agentConfigService.clearCache(memberId);
      }

      return { status: 'ok' };
    } catch (err) {
      this.logger.warn(`Logout cleanup failed: ${err}`);
      return { status: 'ok' };
    }
  }

  @Post('heartbeat')
  async heartbeat(@Headers('authorization') auth: string) {
    if (!auth) return { status: 'ok' };

    try {
      const profileRes = await axios.post(
        this.graphqlUrl,
        {
          query: '{ currentUser { workspaceMember { id } } }',
        },
        {
          headers: { 'Content-Type': 'application/json', Authorization: auth },
        },
      );

      const memberId = profileRes.data?.data?.currentUser?.workspaceMember?.id;
      const agentConfig = memberId
        ? this.agentConfigService.getFromCache(memberId)
        : null;

      if (agentConfig) {
        await this.sessionService.refreshSession(agentConfig.ozonetelAgentId);
      }

      return { status: 'ok' };
    } catch {
      return { status: 'ok' };
    }
  }
}