import { Injectable, Logger } from '@nestjs/common';
import { PlatformGraphqlService } from '../platform/platform-graphql.service';

export type WorklistResponse = {
  missedCalls: any[];
  followUps: any[];
  marketingLeads: any[];
  totalPending: number;
};

@Injectable()
export class WorklistService {
  private readonly logger = new Logger(WorklistService.name);

  constructor(private readonly platform: PlatformGraphqlService) {}

  async getWorklist(
    agentName: string,
    authHeader: string,
  ): Promise<WorklistResponse> {
    const [missedCalls, followUps, marketingLeads] = await Promise.all([
      this.getMissedCalls(agentName, authHeader),
      this.getPendingFollowUps(agentName, authHeader),
      this.getAssignedLeads(agentName, authHeader),
    ]);

    return {
      missedCalls,
      followUps,
      marketingLeads,
      totalPending:
        missedCalls.length + followUps.length + marketingLeads.length,
    };
  }

  private async getAssignedLeads(
    agentName: string,
    authHeader: string,
  ): Promise<any[]> {
    try {
      const data = await this.platform.queryWithAuth<any>(
        `{ leads(first: 20, filter: { assignedAgent: { eq: "${agentName}" } }, orderBy: [{ createdAt: AscNullsLast }]) { edges { node {
                    id createdAt
                    contactName { firstName lastName }
                    contactPhone { primaryPhoneNumber }
                    contactEmail { primaryEmail }
                    source status interestedService
                    assignedAgent campaignId
                    contactAttempts spamScore isSpam
                    aiSummary aiSuggestedAction
                } } } }`,
        undefined,
        authHeader,
      );
      return data.leads.edges.map((e: any) => e.node);
    } catch (err) {
      this.logger.warn(`Failed to fetch assigned leads: ${err}`);
      return [];
    }
  }

  private async getPendingFollowUps(
    agentName: string,
    authHeader: string,
  ): Promise<any[]> {
    try {
      const data = await this.platform.queryWithAuth<any>(
        `{ followUps(first: 20, filter: { assignedAgent: { eq: "${agentName}" } }) { edges { node {
                    id name createdAt
                    typeCustom status scheduledAt completedAt
                    priority assignedAgent
                    patientId
                } } } }`,
        undefined,
        authHeader,
      );
      // Filter to PENDING/OVERDUE client-side since platform may not support in-filter on remapped fields
      return data.followUps.edges
        .map((e: any) => e.node)
        .filter((f: any) => f.status === 'PENDING' || f.status === 'OVERDUE');
    } catch (err) {
      this.logger.warn(`Failed to fetch follow-ups: ${err}`);
      return [];
    }
  }

  private async getMissedCalls(
    agentName: string,
    authHeader: string,
  ): Promise<any[]> {
    try {
      // FIFO ordering (AscNullsLast) — oldest first. No agentName filter — missed calls are a shared queue.
      const data = await this.platform.queryWithAuth<any>(
        `{ calls(first: 20, filter: { callStatus: { eq: MISSED }, callbackstatus: { in: [PENDING_CALLBACK, CALLBACK_ATTEMPTED] } }, orderBy: [{ startedAt: AscNullsLast }]) { edges { node {
                    id name createdAt
                    direction callStatus agentName
                    callerNumber { primaryPhoneNumber }
                    startedAt endedAt durationSec
                    disposition leadId
                    callbackstatus callsourcenumber missedcallcount callbackattemptedat
                } } } }`,
        undefined,
        authHeader,
      );
      return data.calls.edges.map((e: any) => e.node);
    } catch (err) {
      this.logger.warn(`Failed to fetch missed calls: ${err}`);
      return [];
    }
  }
}