import { Injectable, Logger } from "@nestjs/common";
import { Types } from "mongoose";
import { ClaimRequestManagementDbService } from "src/claim-request-management/entites/db-service/claim-request-management.db.service";
import { RequestManagementDbService } from "src/request-management/entities/db-service/request-management.db.service";
import { ClientDbService } from "src/client/entities/db-service/client.db.service";
import { ReqBlameStatus } from "src/Types&Enums/blame-request-management/status.enum";
import { ReqClaimStatus } from "src/Types&Enums/claim-request-management/status.enum";
import { UserType } from "src/Types&Enums/userType.enum";
import {
  CompanyAllRequestsCountReportDtoRs,
  DamageExpertAllRequestsCountReportDtoRs,
  ExpertAllRequestsCountReportDtoRs,
} from "./dto/reports.dto";

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

  constructor(
    private readonly requestManagementDbService: RequestManagementDbService,
    private readonly claimRequestManagementDbService: ClaimRequestManagementDbService,
    private readonly clientDbService: ClientDbService,
  ) {}

  async getAllCheckedRequestsCountFn(role: string, client: string) {
    const statuses = ["UnChecked", "CheckedRequest"];
    const data: Record<string, number> = { all: 0 };
    const clientId = new Types.ObjectId(client);

    for (const status of statuses) {
      let count = 0;
      if (role === "damage_expert") {
        count = await this.claimRequestManagementDbService.countByFilter({
          claimStatus: status,
          userClientKey: clientId,
        });
      } else {
        count = await this.requestManagementDbService.countByFilter({
          blameStatus: status,
          $or: [
            { "firstPartyDetails.firstPartyClient.clientId": clientId },
            { "secondPartyDetails.secondPartyClient.clientId": clientId },
          ],
        });
      }
      data[status] = count;
      data.all += count;
    }
    return data;
  }

  async getDateFilteredRequestByStatus(
    role: string,
    client: string,
    start: Date,
    end: Date,
  ) {
    const statuses = ["UnChecked", "CheckedRequest", "CheckAgain"];
    const data: Record<string, number> = {};
    const clientId = new Types.ObjectId(client);

    for (const status of statuses) {
      let blameCount = 0;
      let claimCount = 0;

      if (role === "expert" || role === "company") {
        blameCount = await this.requestManagementDbService.countByFilter({
          blameStatus: status,
          createdAt: { $gte: start, $lte: end },
          $or: [
            { "firstPartyDetails.firstPartyClient.clientId": clientId },
            { "secondPartyDetails.secondPartyClient.clientId": clientId },
          ],
        });
      }

      if (role === "damage_expert" || role === "company") {
        claimCount = await this.claimRequestManagementDbService.countByFilter({
          claimStatus: status,
          userClientKey: clientId,
          createdAt: { $gte: start, $lte: end },
        });
      }
      data[status] = blameCount + claimCount;
    }
    return data;
  }

  private isVisibleToClientType(client: any, actor: any): boolean {
    if (actor.userType === UserType.GENUINE) {
      return true;
    }
    if (
      actor.userType === UserType.LEGAL &&
      String(client._id) === actor.clientKey
    ) {
      return true;
    }
    return false;
  }

  private wasHandledByActor(request: any, actorSub: string): boolean {
    type ActorCheckerEntry = { CheckedRequest?: { actorId: string } };
    const actorChecker = request.actorsChecker as ActorCheckerEntry[];

    if (!Array.isArray(actorChecker)) {
      return false;
    }

    const matchingEntry = actorChecker.find(
      (entry) => String(entry?.CheckedRequest?.actorId) === actorSub,
    );

    return !!matchingEntry;
  }

  /**
   * Filters claim requests using the same logic as expert-claim service
   * to ensure consistency between endpoints
   */
  private async filterClaimRequestsForExpert(
    requests: any[],
    actor: any,
  ): Promise<any[]> {
    const filteredRequests = [];

    for (const r of requests) {
      // For expert-initiated blame files, only show to the initiating expert
      if (r.blameFile?.expertInitiated && r.blameFile?.initiatedBy) {
        if (String(r.blameFile.initiatedBy) !== actor.sub) {
          continue; // Skip if not the initiating expert
        }
        // Expert-initiated claim files are always visible to the initiating expert
        filteredRequests.push(r);
        continue;
      }

      const client = await this.clientDbService.findOne({
        _id: r.userClientKey,
      });

      if (!client) {
        this.logger.warn(
          `Client not found for claim request with ID: ${r._id}. Skipping.`,
        );
        continue;
      }

      const specialHandlingStatuses = [
        ReqClaimStatus.CheckAgain,
        ReqClaimStatus.ReviewRequest,
        ReqClaimStatus.PendingFactorValidation,
      ];

      const requiresSpecificActorCheck = specialHandlingStatuses.includes(
        r.claimStatus,
      );

      if (requiresSpecificActorCheck) {
        if (this.wasHandledByActor(r, actor.sub)) {
          filteredRequests.push(r);
        }
      } else {
        if (this.isVisibleToClientType(client, actor)) {
          filteredRequests.push(r);
        }
      }
    }

    return filteredRequests;
  }

  async getAllRequestsCountByRole(role: string, client: string, actor?: any) {
    if (role === "expert") {
      const statuses = Object.values(ReqBlameStatus);
      const data: Record<string, number> = { all: 0 };

      for (const status of statuses) {
        const filter = {
          blameStatus: status,
          $or: [
            {
              "firstPartyDetails.firstPartyClient.clientId": new Types.ObjectId(
                client,
              ),
            },
            // {
            //   "secondPartyDetails.secondPartyClient.clientId":
            //     new Types.ObjectId(client),
            // },
          ],
        };

        const count =
          await this.requestManagementDbService.countByFilter(filter);
        data[status] = count;
        data.all += count;
      }

      return data;
    }

    if (role === "damage_expert") {
      const statuses = Object.values(ReqClaimStatus);
      const data: Record<string, number> = { all: 0 };

      // For damage_expert, we need to apply the same filtering as expert-claim service
      if (actor) {
        // Fetch all requests with the statuses that expert-claim service shows
        // This matches the statuses in getClaimRequestsListForExpert
        const relevantStatuses = [
          ReqClaimStatus.UnChecked,
          ReqClaimStatus.ReviewRequest,
          ReqClaimStatus.CheckAgain,
          ReqClaimStatus.CloseRequest,
          ReqClaimStatus.InPersonVisit,
          ReqClaimStatus.CheckedRequest,
          ReqClaimStatus.PendingFactorValidation,
        ];

        // Fetch all requests with relevant statuses (matching expert-claim query)
        const allRequests =
          await this.claimRequestManagementDbService.findAllByStatus({
            claimStatus: { $in: relevantStatuses },
          });

        // Filter requests using the same logic as expert-claim service
        const filteredRequests =
          await this.filterClaimRequestsForExpert(allRequests, actor);

        // Count by status from filtered results
        for (const status of statuses) {
          const count = filteredRequests.filter(
            (r) => r.claimStatus === status,
          ).length;
          data[status] = count;
          data.all += count;
        }
      } else {
        // Fallback to simple count if actor not provided (shouldn't happen for damage_expert)
        for (const status of statuses) {
          const filter = {
            claimStatus: status,
            userClientKey: new Types.ObjectId(client),
          };

          const count =
            await this.claimRequestManagementDbService.countByFilter(filter);
          data[status] = count;
          data.all += count;
        }
      }

      return data;
    }

    // ✅ Company logic
    if (role === "company") {
      const blameStatuses = Object.values(ReqBlameStatus);
      const claimStatuses = Object.values(ReqClaimStatus);

      const blameData: Record<string, number> = { all: 0 };
      const claimData: Record<string, number> = { all: 0 };

      // Only count files where this company is FIRST party in Blame
      for (const status of blameStatuses) {
        const filter = {
          blameStatus: status,
          "firstPartyDetails.firstPartyClient.clientId": new Types.ObjectId(
            client,
          ),
        };

        const count =
          await this.requestManagementDbService.countByFilter(filter);
        blameData[status] = count;
        blameData.all += count;
      }

      // Claims always use `userClientKey`
      for (const status of claimStatuses) {
        const filter = {
          claimStatus: status,
          userClientKey: new Types.ObjectId(client),
        };

        const count =
          await this.claimRequestManagementDbService.countByFilter(filter);
        claimData[status] = count;
        claimData.all += count;
      }

      return { blameData, claimData };
    }

    return null;
  }

  async getAllRequestsReportCount(actor, client) {
    if (actor.role === "damage_expert") {
      // Pass actor to apply filtering logic for damage_expert
      const data = await this.getAllRequestsCountByRole(
        actor.role,
        client,
        actor,
      );
      return new DamageExpertAllRequestsCountReportDtoRs(data);
    } else if (actor.role === "expert") {
      const data = await this.getAllRequestsCountByRole(actor.role, client);
      return new ExpertAllRequestsCountReportDtoRs(data);
    } else {
      // company
      const damageExpertData = await this.getAllRequestsCountByRole(
        "damage_expert",
        client,
      );
      const expertData = await this.getAllRequestsCountByRole("expert", client);
      return new CompanyAllRequestsCountReportDtoRs(
        expertData,
        damageExpertData,
      );
    }
  }

  async getAllRequestsReportPerMonth(actor, client) {
    const result = [];
    const now = new Date();

    if (actor.role === "company") {
      for (let i = 0; i < 5; i++) {
        const monthStart = new Date(now.getFullYear(), now.getMonth() - i, 1);
        const monthEnd = new Date(
          now.getFullYear(),
          now.getMonth() - i + 1,
          0,
          23,
          59,
          59,
        );
        const label = monthStart.toLocaleDateString("fa-IR", {
          month: "long",
          year: "numeric",
        });

        const blameData = await this.getDateFilteredRequestByStatus(
          "expert",
          client,
          monthStart,
          monthEnd,
        );
        const claimData = await this.getDateFilteredRequestByStatus(
          "damage_expert",
          client,
          monthStart,
          monthEnd,
        );

        result.unshift({
          stDate: monthStart,
          enDate: monthEnd,
          faLabel: label,
          data: {
            blame: blameData,
            claim: claimData,
          },
        });
      }
      return result;
    } else {
      for (let i = 0; i < 5; i++) {
        const monthStart = new Date(now.getFullYear(), now.getMonth() - i, 1);
        const monthEnd = new Date(
          now.getFullYear(),
          now.getMonth() - i + 1,
          0,
          23,
          59,
          59,
        );
        const label = monthStart.toLocaleDateString("fa-IR", {
          month: "long",
          year: "numeric",
        });
        const data = await this.getDateFilteredRequestByStatus(
          actor.role,
          client,
          monthStart,
          monthEnd,
        );
        result.unshift({
          stDate: monthStart,
          enDate: monthEnd,
          faLabel: label,
          data,
        });
      }
      return result;
    }
  }

  async getAllCheckedRequestsCount(actor, client) {
    if (actor.role === "damage_expert" || actor.role === "expert") {
      return this.getAllCheckedRequestsCountFn(actor.role, client);
    } else {
      const blame = await this.getAllCheckedRequestsCountFn("expert", client);
      const claim = await this.getAllCheckedRequestsCountFn(
        "damage_expert",
        client,
      );
      return { blame, claim };
    }
  }
}