import { Controller, Post, Get, Body, HttpException, Logger } from '@nestjs/common';
import axios from 'axios';
import { OzonetelAdminAuthService } from '../ozonetel/ozonetel-admin-auth.service';
import { SupervisorService } from './supervisor.service';
import { TelephonyConfigService } from '../config/telephony-config.service';

// Supervisor barge/whisper/listen endpoints.
// Proxies requests to Ozonetel's dashboardApi using admin JWT auth.
//
// API reference (from CA-Admin source code):
//   apiId 63  → CALL_BARGEIN (initiate barge)
//   apiId 158 → Redis barge state (insert/delete)
//   apiId 139 → SIP credential pool (sipSubscribe)

@Controller('api/supervisor/barge')
export class SupervisorBargeController {
    private readonly logger = new Logger(SupervisorBargeController.name);
    private readonly dashboardApiUrl = 'https://api.cloudagent.ozonetel.com/dashboardApi/monitor/api';
    private readonly adminApiUrl = 'https://api.cloudagent.ozonetel.com/ca-admin-Api/CloudAgentAPI';

    constructor(
        private readonly adminAuth: OzonetelAdminAuthService,
        private readonly supervisor: SupervisorService,
        private readonly telephony: TelephonyConfigService,
    ) {}

    @Get('sip-credentials')
    async getSipCredentials() {
        if (!this.adminAuth.isConfigured()) {
            throw new HttpException('Ozonetel admin not configured — add credentials in Settings → Telephony', 503);
        }

        const config = this.telephony.getConfig();
        const sipGateway = `${config.sip.domain}:${config.sip.wsPort}`;
        const headers = await this.adminAuth.getAuthHeaders();

        try {
            const res = await axios.post(`${this.adminApiUrl}/endpoint/sipnumber/sipSubscribe`, {
                apiId: 139,
                sipURL: sipGateway,
            }, { headers });

            const data = res.data;
            this.logger.log(`[BARGE] SIP credentials response: ${JSON.stringify(data)}`);

            if (!data?.sip_number) {
                throw new HttpException('No SIP numbers available in pool', 503);
            }

            return {
                sipNumber: data.sip_number,
                sipPassword: data.password,
                sipDomain: data.pop_location ?? config.sip.domain,
                sipPort: config.sip.wsPort,
            };
        } catch (err: any) {
            this.logger.error(`[BARGE] SIP credentials failed: ${err.message}`);
            if (err instanceof HttpException) throw err;
            throw new HttpException('Failed to fetch SIP credentials', 502);
        }
    }

    @Post()
    async initiateBarge(@Body() body: { ucid: string; agentId: string; agentNumber: string; supervisorId?: string }) {
        if (!body.ucid || !body.agentNumber) {
            throw new HttpException('ucid and agentNumber required', 400);
        }
        if (!this.adminAuth.isConfigured()) {
            throw new HttpException('Ozonetel admin not configured — add credentials in Settings → Telephony', 503);
        }

        // Prevent double-barge on same agent
        const existing = this.supervisor.getBargeSession(body.agentId);
        if (existing) {
            throw new HttpException(`Agent ${body.agentId} is already being monitored`, 409);
        }

        // Get SIP credentials from Ozonetel pool
        const sipCreds = await this.getSipCredentials();
        const headers = await this.adminAuth.getAuthHeaders();

        try {
            const res = await axios.post(this.dashboardApiUrl, {
                apiId: 63,
                ucid: body.ucid,
                action: 'CALL_BARGEIN',
                isSip: true,
                phoneno: sipCreds.sipNumber,
                agentNumber: body.agentNumber,
                cbURL: 'helix-engage',
            }, { headers });

            this.logger.log(`[BARGE] Initiated: ucid=${body.ucid} agent=${body.agentId} sip=${sipCreds.sipNumber} response=${JSON.stringify(res.data)}`);

            // Track the session
            this.supervisor.startBargeSession({
                supervisorId: body.supervisorId ?? 'admin',
                agentId: body.agentId,
                sipNumber: sipCreds.sipNumber,
                mode: 'listen',
                startedAt: new Date().toISOString(),
            });

            return {
                status: 'ok',
                ...sipCreds,
                ozonetelResponse: res.data,
            };
        } catch (err: any) {
            this.logger.error(`[BARGE] Initiation failed: ${err.message} ${err.response?.data ? JSON.stringify(err.response.data) : ''}`);
            throw new HttpException(`Barge failed: ${err.response?.data?.Message ?? err.message}`, 502);
        }
    }

    @Post('mode')
    async updateMode(@Body() body: { agentId: string; mode: 'listen' | 'whisper' | 'barge' }) {
        if (!body.agentId || !body.mode) {
            throw new HttpException('agentId and mode required', 400);
        }
        if (!['listen', 'whisper', 'barge'].includes(body.mode)) {
            throw new HttpException('mode must be listen, whisper, or barge', 400);
        }

        const session = this.supervisor.getBargeSession(body.agentId);
        if (!session) {
            throw new HttpException('No active barge session for this agent', 404);
        }

        this.supervisor.updateBargeMode(body.agentId, body.mode);
        return { status: 'ok', mode: body.mode };
    }

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

        const session = this.supervisor.getBargeSession(body.agentId);
        if (!session) {
            return { status: 'ok', message: 'No active session' };
        }

        // Clear Redis tracking on Ozonetel side (best-effort)
        if (this.adminAuth.isConfigured()) {
            try {
                const headers = await this.adminAuth.getAuthHeaders();
                await axios.post(this.dashboardApiUrl, {
                    apiId: 158,
                    Action: 'delete',
                    AgentId: body.agentId,
                    Sip: session.sipNumber,
                }, { headers });
                this.logger.log(`[BARGE] Redis cleanup: ${body.agentId}`);
            } catch (err: any) {
                this.logger.warn(`[BARGE] Redis cleanup failed (non-critical): ${err.message}`);
            }
        }

        this.supervisor.endBargeSession(body.agentId);
        return { status: 'ok' };
    }
}