package service

import (
	"gitlab.com/mbugroup/lti-api.git/internal/modules/repports/dto"
	validation "gitlab.com/mbugroup/lti-api.git/internal/modules/repports/validations"
	"gitlab.com/mbugroup/lti-api.git/internal/utils"

	approvalService "gitlab.com/mbugroup/lti-api.git/internal/common/service"
	approvalDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/approvals/dto"
	expenseRepo "gitlab.com/mbugroup/lti-api.git/internal/modules/expenses/repositories"

	"github.com/go-playground/validator/v10"
	"github.com/gofiber/fiber/v2"
	"github.com/sirupsen/logrus"
	"gorm.io/gorm"
)

type RepportService interface {
	GetExpense(ctx *fiber.Ctx, params *validation.Query) ([]dto.RepportExpenseListDTO, int64, error)
}

type repportService struct {
	Log                    *logrus.Logger
	Validate               *validator.Validate
	ExpenseRealizationRepo expenseRepo.ExpenseRealizationRepository
	ApprovalSvc            approvalService.ApprovalService
}

func NewRepportService(validate *validator.Validate, expenseRealizationRepo expenseRepo.ExpenseRealizationRepository, approvalSvc approvalService.ApprovalService) RepportService {
	return &repportService{
		Log:                    utils.Log,
		Validate:               validate,
		ExpenseRealizationRepo: expenseRealizationRepo,
		ApprovalSvc:            approvalSvc,
	}
}

func (s *repportService) GetExpense(c *fiber.Ctx, params *validation.Query) ([]dto.RepportExpenseListDTO, int64, error) {
	if err := s.Validate.Struct(params); err != nil {
		return nil, 0, err
	}

	offset := (params.Page - 1) * params.Limit

	realizations, total, err := s.ExpenseRealizationRepo.GetAllWithFilters(c.Context(), offset, params.Limit, params)
	if err != nil {
		s.Log.Errorf("GetAllWithFilters error: %v", err)
		return nil, 0, err
	}

	result := dto.ToRepportExpenseListDTOs(realizations)

	expenseIDs := make([]uint, 0, len(result))
	for i := range result {
		expenseIDs = append(expenseIDs, uint(result[i].Id))
	}

	approvals, err := s.ApprovalSvc.LatestByTargets(c.Context(), utils.ApprovalWorkflowExpense, expenseIDs, func(db *gorm.DB) *gorm.DB {
		return db.Preload("ActionUser")
	})
	if err != nil {
		s.Log.Warnf("LatestByTargets error: %v", err)
	}

	for i := range result {
		expenseIDAsUint := uint(result[i].Id)
		if approval, exists := approvals[expenseIDAsUint]; exists && approval != nil {
			mapped := approvalDTO.ToApprovalDTO(*approval)
			result[i].LatestApproval = &mapped
		}
	}

	return result, total, nil
}