import { Injectable } from '@nestjs/common';
import { PrismaClient } from '@prisma/client';
import { ROLE } from '../../../common/utils/constants/common.constant';

import ApiError from '../../../common/utils/helper/ApiError';

function normalizeIdArray(values: unknown): number[] {
  if (!Array.isArray(values)) {
    return [];
  }

  return Array.from(
    new Set(
      values
        .map((item) => Number(item))
        .filter((item) => Number.isInteger(item) && item > 0),
    ),
  );
}

@Injectable()
export class HostRolePermissionService {
  constructor(private prisma: PrismaClient) {}

  async saveRolePermissions(input: {
    hostUserXid: number;
    roleXid: number;
    permissionMasterXids: unknown;
  }) {
    const permissionMasterXids = normalizeIdArray(input.permissionMasterXids);

    if (!permissionMasterXids.length) {
      throw new ApiError(400, 'permissionMasterXids is required.');
    }

    return this.prisma.$transaction(async (tx) => {
      const host = await tx.hostHeader.findFirst({
        where: {
          userXid: input.hostUserXid,
          isActive: true,
          deletedAt: null,
        },
        select: {
          id: true,
          companyName: true,
          userXid: true,
        },
      });

      if (!host) {
        throw new ApiError(404, 'Host company not found for the logged-in user.');
      }

      const role = await tx.roles.findFirst({
        where: {
          id: input.roleXid,
          isActive: true,
          deletedAt: null,
        },
        select: {
          id: true,
          roleName: true,
        },
      });

      if (!role) {
        throw new ApiError(400, 'Invalid roleXid.');
      }

      const selectedPermissions = await tx.hostPermissionMasters.findMany({
        where: {
          id: { in: permissionMasterXids },
          isActive: true,
          deletedAt: null,
        },
        select: {
          id: true,
          permissionKey: true,
          permissionGroup: true,
          permissionSection: true,
          permissionAction: true,
          displayLabel: true,
          displayOrder: true,
        },
        orderBy: {
          displayOrder: 'asc',
        },
      });

      if (selectedPermissions.length !== permissionMasterXids.length) {
        throw new ApiError(400, 'One or more permissionMasterXids are invalid.');
      }

      const saved = await tx.hostRolePermissionMasters.upsert({
        where: {
          hostXid_roleXid: {
            hostXid: host.id,
            roleXid: role.id,
          },
        },
        create: {
          hostXid: host.id,
          roleXid: role.id,
          permissionMasterXids,
          isActive: true,
        },
        update: {
          permissionMasterXids,
          isActive: true,
          deletedAt: null,
        },
        select: {
          id: true,
          hostXid: true,
          roleXid: true,
          permissionMasterXids: true,
          createdAt: true,
          updatedAt: true,
        },
      });

      return {
        host,
        role,
        saved,
        selectedPermissions,
      };
    });
  }

  async getMemberPermissions(input: {
    hostUserXid: number;
    memberUserXid: number;
  }) {
    return this.prisma.$transaction(async (tx) => {
      // Find the host
      const host = await tx.hostHeader.findFirst({
        where: {
          userXid: input.hostUserXid,
          isActive: true,
          deletedAt: null,
        },
        select: {
          id: true,
          companyName: true,
          userXid: true,
        },
      });

      if (!host) {
        throw new ApiError(404, 'Host company not found for the logged-in user.');
      }

      // Find the host member
      const hostMember = await tx.hostMembers.findFirst({
        where: {
          hostXid: host.id,
          userXid: input.memberUserXid,
          isActive: true,
          deletedAt: null,
          memberStatus: 'accepted',
        },
        select: {
          id: true,
          userXid: true,
          roleXid: true,
          role: {
            select: {
              id: true,
              roleName: true,
            },
          },
          hostRolePermissionMasterXid: true,
        },
      });

      if (!hostMember) {
        throw new ApiError(404, 'Host member not found or not active.');
      }

      // Check if role is operator or co-admin
      if (hostMember.roleXid !== ROLE.CO_ADMIN && hostMember.roleXid !== ROLE.OPERATOR) {
        throw new ApiError(400, 'Member is not an operator or co-admin.');
      }

      if (!hostMember.hostRolePermissionMasterXid) {
        // Return empty permissions if no role permissions assigned
        return {
          host,
          member: {
            userXid: hostMember.userXid,
            role: hostMember.role,
          },
          permissions: [],
        };
      }

      // Get the role permissions
      const rolePermissions = await tx.hostRolePermissionMasters.findFirst({
        where: {
          id: hostMember.hostRolePermissionMasterXid,
          isActive: true,
          deletedAt: null,
        },
        select: {
          id: true,
          permissionMasterXids: true,
        },
      });

      if (!rolePermissions) {
        return {
          host,
          member: {
            userXid: hostMember.userXid,
            role: hostMember.role,
          },
          permissions: [],
        };
      }

      // Get the actual permissions
      const permissionIds = rolePermissions.permissionMasterXids as number[];
      const permissions = await tx.hostPermissionMasters.findMany({
        where: {
          id: { in: permissionIds },
          isActive: true,
          deletedAt: null,
        },
        select: {
          id: true,
          permissionKey: true,
          permissionGroup: true,
          permissionSection: true,
          permissionAction: true,
          displayLabel: true,
          displayOrder: true,
        },
        orderBy: {
          displayOrder: 'asc',
        },
      });

      return {
        host,
        member: {
          userXid: hostMember.userXid,
          role: hostMember.role,
        },
        permissions,
      };
    });
  }
}