import { Injectable, Logger } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import axios from 'axios';

@Injectable()
export class OzonetelAgentService {
  private readonly logger = new Logger(OzonetelAgentService.name);
  private readonly apiDomain: string;
  private readonly apiKey: string;
  private readonly accountId: string;
  private cachedToken: string | null = null;
  private tokenExpiry: number = 0;

  constructor(private config: ConfigService) {
    this.apiDomain =
      config.get<string>('exotel.subdomain') ?? 'in1-ccaas-api.ozonetel.com';
    this.apiKey = config.get<string>('exotel.apiKey') ?? '';
    this.accountId = config.get<string>('exotel.accountSid') ?? '';
  }

  private async getToken(): Promise<string> {
    if (this.cachedToken && Date.now() < this.tokenExpiry) {
      return this.cachedToken;
    }

    return this.refreshToken();
  }

  async refreshToken(): Promise<string> {
    const url = `https://${this.apiDomain}/ca_apis/CAToken/generateToken`;
    this.logger.log('Generating CloudAgent API token');

    const response = await axios.post(
      url,
      { userName: this.accountId },
      {
        headers: { apiKey: this.apiKey, 'Content-Type': 'application/json' },
      },
    );

    const data = response.data;
    if (data.token) {
      this.cachedToken = data.token;
      this.tokenExpiry = Date.now() + 10 * 60 * 1000; // 10 min cache (Ozonetel expires in ~15 min)
      this.logger.log('CloudAgent token generated successfully');
      return data.token;
    }

    throw new Error(data.message ?? 'Token generation failed');
  }

  private invalidateToken(): void {
    this.cachedToken = null;
    this.tokenExpiry = 0;
  }

  async loginAgent(params: {
    agentId: string;
    password: string;
    phoneNumber: string;
    mode?: string;
  }): Promise<{ status: string; message: string }> {
    const url = `https://${this.apiDomain}/CAServices/AgentAuthenticationV2/index.php`;

    this.logger.log(
      `Logging in agent ${params.agentId} with phone ${params.phoneNumber}`,
    );

    try {
      const response = await axios.post(
        url,
        new URLSearchParams({
          userName: this.accountId,
          apiKey: this.apiKey,
          phoneNumber: params.phoneNumber,
          action: 'login',
          mode: params.mode ?? 'blended',
          state: 'Ready',
        }).toString(),
        {
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
          },
          auth: {
            username: params.agentId,
            password: params.password,
          },
        },
      );

      const data = response.data;

      // "already logged in" — force logout + re-login to refresh SIP phone mapping
      if (
        data.status === 'error' &&
        data.message?.includes('already logged in')
      ) {
        this.logger.log(
          `Agent ${params.agentId} already logged in — forcing logout + re-login`,
        );
        try {
          await this.logoutAgent({
            agentId: params.agentId,
            password: params.password,
          });
          const retryResponse = await axios.post(
            url,
            new URLSearchParams({
              userName: this.accountId,
              apiKey: this.apiKey,
              phoneNumber: params.phoneNumber,
              action: 'login',
              mode: params.mode ?? 'blended',
              state: 'Ready',
            }).toString(),
            {
              headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
              auth: { username: params.agentId, password: params.password },
            },
          );
          this.logger.log(
            `Agent re-login response: ${JSON.stringify(retryResponse.data)}`,
          );
          return retryResponse.data;
        } catch (retryErr: any) {
          this.logger.error(`Agent re-login failed: ${retryErr.message}`);
          return { status: 'success', message: 'Re-login attempted' };
        }
      }

      this.logger.log(`Agent login response: ${JSON.stringify(data)}`);
      return data;
    } catch (error: any) {
      if (error?.response?.status === 401) this.invalidateToken();
      this.logger.error(`Agent login failed: ${error.message}`);
      throw error;
    }
  }

  async manualDial(params: {
    agentId: string;
    campaignName: string;
    customerNumber: string;
  }): Promise<{ status: string; ucid?: string; message?: string }> {
    const url = `https://${this.apiDomain}/ca_apis/AgentManualDial`;

    this.logger.log(
      `Manual dial: agent=${params.agentId} campaign=${params.campaignName} number=${params.customerNumber}`,
    );

    try {
      const token = await this.getToken();
      const response = await axios.post(
        url,
        {
          userName: this.accountId,
          agentID: params.agentId,
          campaignName: params.campaignName,
          customerNumber: params.customerNumber,
          UCID: 'true',
        },
        {
          headers: {
            Authorization: `Bearer ${token}`,
            'Content-Type': 'application/json',
          },
        },
      );
      this.logger.log(`Manual dial response: ${JSON.stringify(response.data)}`);
      return response.data;
    } catch (error: any) {
      if (error?.response?.status === 401) this.invalidateToken();
      const responseData = error?.response?.data
        ? JSON.stringify(error.response.data)
        : '';
      this.logger.error(`Manual dial failed: ${error.message} ${responseData}`);
      throw error;
    }
  }

  async changeAgentState(params: {
    agentId: string;
    state: 'Ready' | 'Pause';
    pauseReason?: string;
  }): Promise<{ status: string; message: string }> {
    const url = `https://${this.apiDomain}/ca_apis/changeAgentState`;

    this.logger.log(
      `Changing agent ${params.agentId} state to ${params.state}`,
    );

    try {
      const body: Record<string, string> = {
        userName: this.accountId,
        agentId: params.agentId,
        state: params.state,
      };
      if (params.pauseReason) {
        body.pauseReason = params.pauseReason;
      }

      const token = await this.getToken();
      const response = await axios.post(url, body, {
        headers: {
          Authorization: `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
      });

      this.logger.log(
        `Change agent state response: ${JSON.stringify(response.data)}`,
      );
      return response.data;
    } catch (error: any) {
      const responseData = error?.response?.data
        ? JSON.stringify(error.response.data)
        : '';
      this.logger.error(
        `Change agent state failed: ${error.message} ${responseData}`,
      );
      throw error;
    }
  }

  async setDisposition(params: {
    agentId: string;
    ucid: string;
    disposition: string;
  }): Promise<{ status: string; message?: string; details?: string }> {
    const url = `https://${this.apiDomain}/ca_apis/DispositionAPIV2`;
    const did = process.env.OZONETEL_DID ?? '918041763265';

    this.logger.log(
      `Set disposition: agent=${params.agentId} ucid=${params.ucid} disposition=${params.disposition}`,
    );

    try {
      const token = await this.getToken();
      const response = await axios.post(
        url,
        {
          userName: this.accountId,
          agentID: params.agentId,
          did,
          ucid: params.ucid,
          action: 'Set',
          disposition: params.disposition,
          autoRelease: 'true',
        },
        {
          headers: {
            Authorization: `Bearer ${token}`,
            'Content-Type': 'application/json',
          },
        },
      );

      this.logger.log(
        `Set disposition response: ${JSON.stringify(response.data)}`,
      );
      return response.data;
    } catch (error: any) {
      const responseData = error?.response?.data
        ? JSON.stringify(error.response.data)
        : '';
      this.logger.error(
        `Set disposition failed: ${error.message} ${responseData}`,
      );
      throw error;
    }
  }

  async callControl(params: {
    action: 'CONFERENCE' | 'HOLD' | 'UNHOLD' | 'MUTE' | 'UNMUTE' | 'KICK_CALL';
    ucid: string;
    conferenceNumber?: string;
  }): Promise<{ status: string; message: string; ucid?: string }> {
    const url = `https://${this.apiDomain}/ca_apis/CallControl_V4`;
    const did = process.env.OZONETEL_DID ?? '918041763265';
    const agentPhoneName = process.env.OZONETEL_SIP_ID ?? '523590';

    this.logger.log(
      `Call control: action=${params.action} ucid=${params.ucid} conference=${params.conferenceNumber ?? 'none'}`,
    );

    try {
      const token = await this.getToken();
      const body: Record<string, string> = {
        userName: this.accountId,
        action: params.action,
        ucid: params.ucid,
        did,
        agentPhoneName,
      };
      if (params.conferenceNumber) {
        body.conferenceNumber = params.conferenceNumber;
      }

      const response = await axios.post(url, body, {
        headers: {
          Authorization: `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
      });

      this.logger.log(
        `Call control response: ${JSON.stringify(response.data)}`,
      );
      return response.data;
    } catch (error: any) {
      const responseData = error?.response?.data
        ? JSON.stringify(error.response.data)
        : '';
      this.logger.error(
        `Call control failed: ${error.message} ${responseData}`,
      );
      throw error;
    }
  }

  async pauseRecording(params: {
    ucid: string;
    action: 'pause' | 'unPause';
  }): Promise<{ status: string; message: string }> {
    const url = `https://${this.apiDomain}/CAServices/Call/Record.php`;

    this.logger.log(`Recording ${params.action}: ucid=${params.ucid}`);

    try {
      const response = await axios.get(url, {
        params: {
          userName: this.accountId,
          apiKey: this.apiKey,
          action: params.action,
          ucid: params.ucid,
        },
      });

      this.logger.log(
        `Recording control response: ${JSON.stringify(response.data)}`,
      );
      return response.data;
    } catch (error: any) {
      const responseData = error?.response?.data
        ? JSON.stringify(error.response.data)
        : '';
      this.logger.error(
        `Recording control failed: ${error.message} ${responseData}`,
      );
      throw error;
    }
  }

  async getAbandonCalls(params?: {
    fromTime?: string;
    toTime?: string;
    campaignName?: string;
  }): Promise<
    Array<{
      monitorUCID: string;
      type: string;
      status: string;
      campaign: string;
      callerID: string;
      did: string;
      agentID: string;
      agent: string;
      hangupBy: string;
      callTime: string;
    }>
  > {
    const url = `https://${this.apiDomain}/ca_apis/abandonCalls`;

    this.logger.log('Fetching abandon calls');

    try {
      const token = await this.getToken();
      const body: Record<string, string> = { userName: this.accountId };
      if (params?.fromTime) body.fromTime = params.fromTime;
      if (params?.toTime) body.toTime = params.toTime;
      if (params?.campaignName) body.campaignName = params.campaignName;

      const response = await axios({
        method: 'GET',
        url,
        headers: {
          Authorization: `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
        data: JSON.stringify(body),
      });

      const data = response.data;
      this.logger.log(
        `Abandon calls response: ${JSON.stringify(data).substring(0, 200)}`,
      );
      if (data.status === 'success' && Array.isArray(data.message)) {
        return data.message;
      }
      return [];
    } catch (error: any) {
      if (error?.response?.status === 401) this.invalidateToken();
      this.logger.error(`Abandon calls failed: ${error.message}`);
      return [];
    }
  }

  async fetchCDR(params: {
    date: string; // YYYY-MM-DD
    campaignName?: string;
    status?: string;
    callType?: string;
  }): Promise<Array<Record<string, any>>> {
    const url = `https://${this.apiDomain}/ca_reports/fetchCDRDetails`;

    this.logger.log(`Fetch CDR: date=${params.date}`);

    try {
      const token = await this.getToken();
      const body: Record<string, string> = {
        userName: this.accountId,
        fromDate: `${params.date} 00:00:00`,
        toDate: `${params.date} 23:59:59`,
      };
      if (params.campaignName) body.campaignName = params.campaignName;
      if (params.status) body.status = params.status;
      if (params.callType) body.callType = params.callType;

      const response = await axios({
        method: 'GET',
        url,
        headers: {
          Authorization: `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
        data: JSON.stringify(body),
      });

      const data = response.data;
      if (data.status === 'success' && Array.isArray(data.details)) {
        return data.details;
      }
      return [];
    } catch (error: any) {
      const responseData = error?.response?.data
        ? JSON.stringify(error.response.data)
        : '';
      this.logger.error(`Fetch CDR failed: ${error.message} ${responseData}`);
      return [];
    }
  }

  async getAgentSummary(
    agentId: string,
    date: string,
  ): Promise<{
    totalLoginDuration: string;
    totalBusyTime: string;
    totalIdleTime: string;
    totalPauseTime: string;
    totalWrapupTime: string;
    totalDialTime: string;
  } | null> {
    const url = `https://${this.apiDomain}/ca_reports/summaryReport`;

    try {
      const token = await this.getToken();
      const response = await axios({
        method: 'GET',
        url,
        headers: {
          Authorization: `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
        data: JSON.stringify({
          userName: this.accountId,
          agentId,
          fromDate: `${date} 00:00:00`,
          toDate: `${date} 23:59:59`,
        }),
      });

      const data = response.data;
      if (data.status === 'success' && data.message) {
        const record = Array.isArray(data.message)
          ? data.message[0]
          : data.message;
        return {
          totalLoginDuration: record.TotalLoginDuration ?? '00:00:00',
          totalBusyTime: record.TotalBusyTime ?? '00:00:00',
          totalIdleTime: record.TotalIdleTime ?? '00:00:00',
          totalPauseTime: record.TotalPauseTime ?? '00:00:00',
          totalWrapupTime: record.TotalWrapupTime ?? '00:00:00',
          totalDialTime: record.TotalDialTime ?? '00:00:00',
        };
      }
      return null;
    } catch (error: any) {
      if (error?.response?.status === 401) this.invalidateToken();
      this.logger.error(`Agent summary failed: ${error.message}`);
      return null;
    }
  }

  async getAHT(agentId: string): Promise<string> {
    const url = `https://${this.apiDomain}/ca_apis/aht`;

    try {
      const token = await this.getToken();
      const response = await axios({
        method: 'GET',
        url,
        headers: {
          Authorization: `Bearer ${token}`,
          'Content-Type': 'application/json',
        },
        data: JSON.stringify({
          userName: this.accountId,
          agentId,
        }),
      });

      const data = response.data;
      if (data.status === 'success') {
        return data.AHT ?? '00:00:00';
      }
      return '00:00:00';
    } catch (error: any) {
      if (error?.response?.status === 401) this.invalidateToken();
      this.logger.error(`AHT failed: ${error.message}`);
      return '00:00:00';
    }
  }

  async logoutAgent(params: {
    agentId: string;
    password: string;
  }): Promise<{ status: string; message: string }> {
    const url = `https://${this.apiDomain}/CAServices/AgentAuthenticationV2/index.php`;

    this.logger.log(`Logging out agent ${params.agentId}`);

    try {
      const response = await axios.post(
        url,
        new URLSearchParams({
          userName: this.accountId,
          apiKey: this.apiKey,
          action: 'logout',
          mode: 'blended',
          state: 'Ready',
        }).toString(),
        {
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
          },
          auth: {
            username: params.agentId,
            password: params.password,
          },
        },
      );

      this.logger.log(
        `Agent logout response: ${JSON.stringify(response.data)}`,
      );
      return response.data;
    } catch (error: any) {
      if (error?.response?.status === 401) this.invalidateToken();
      this.logger.error(`Agent logout failed: ${error.message}`);
      throw error;
    }
  }
}