package processor

import (
	"apskel-pos-be/internal/entities"
	"apskel-pos-be/internal/mappers"
	"apskel-pos-be/internal/models"
	"apskel-pos-be/internal/repository"
	"context"
	"fmt"
	"time"

	"github.com/google/uuid"
)

type OmsetTrackerProcessor struct {
	omsetTrackerRepo *repository.OmsetTrackerRepository
}

func NewOmsetTrackerProcessor(omsetTrackerRepo *repository.OmsetTrackerRepository) *OmsetTrackerProcessor {
	return &OmsetTrackerProcessor{
		omsetTrackerRepo: omsetTrackerRepo,
	}
}

// CreateOmsetTracker creates a new omset tracker record
func (p *OmsetTrackerProcessor) CreateOmsetTracker(ctx context.Context, req *models.CreateOmsetTrackerRequest) (*models.OmsetTrackerResponse, error) {
	// Convert request to entity
	omsetTracker := mappers.ToOmsetTrackerEntity(req)

	// Create omset tracker
	err := p.omsetTrackerRepo.Create(ctx, omsetTracker)
	if err != nil {
		return nil, fmt.Errorf("failed to create omset tracker: %w", err)
	}

	return mappers.ToOmsetTrackerResponse(omsetTracker), nil
}

// GetOmsetTracker retrieves an omset tracker by ID
func (p *OmsetTrackerProcessor) GetOmsetTracker(ctx context.Context, id uuid.UUID) (*models.OmsetTrackerResponse, error) {
	omsetTracker, err := p.omsetTrackerRepo.GetByID(ctx, id)
	if err != nil {
		return nil, fmt.Errorf("omset tracker not found: %w", err)
	}

	return mappers.ToOmsetTrackerResponse(omsetTracker), nil
}

// ListOmsetTrackers retrieves omset trackers with pagination and filtering
func (p *OmsetTrackerProcessor) ListOmsetTrackers(ctx context.Context, query *models.ListOmsetTrackerQuery) (*models.PaginatedResponse[models.OmsetTrackerResponse], error) {
	// Set default values
	if query.Page <= 0 {
		query.Page = 1
	}
	if query.Limit <= 0 {
		query.Limit = 10
	}
	if query.Limit > 100 {
		query.Limit = 100
	}

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

	// Get omset trackers from repository
	omsetTrackers, total, err := p.omsetTrackerRepo.List(
		ctx,
		offset,
		query.Limit,
		query.Search,
		query.PeriodType,
		query.GameID,
		query.From,
		query.To,
		query.SortBy,
		query.SortOrder,
	)
	if err != nil {
		return nil, fmt.Errorf("failed to list omset trackers: %w", err)
	}

	// Convert to responses
	responses := mappers.ToOmsetTrackerResponses(omsetTrackers)

	// Calculate pagination info
	totalPages := int((total + int64(query.Limit) - 1) / int64(query.Limit))

	return &models.PaginatedResponse[models.OmsetTrackerResponse]{
		Data: responses,
		Pagination: models.Pagination{
			Page:       query.Page,
			Limit:      query.Limit,
			Total:      total,
			TotalPages: totalPages,
		},
	}, nil
}

// UpdateOmsetTracker updates an existing omset tracker
func (p *OmsetTrackerProcessor) UpdateOmsetTracker(ctx context.Context, id uuid.UUID, req *models.UpdateOmsetTrackerRequest) (*models.OmsetTrackerResponse, error) {
	// Get existing omset tracker
	omsetTracker, err := p.omsetTrackerRepo.GetByID(ctx, id)
	if err != nil {
		return nil, fmt.Errorf("omset tracker not found: %w", err)
	}

	// Update omset tracker fields
	mappers.UpdateOmsetTrackerEntity(omsetTracker, req)

	// Save updated omset tracker
	err = p.omsetTrackerRepo.Update(ctx, omsetTracker)
	if err != nil {
		return nil, fmt.Errorf("failed to update omset tracker: %w", err)
	}

	return mappers.ToOmsetTrackerResponse(omsetTracker), nil
}

// DeleteOmsetTracker deletes an omset tracker
func (p *OmsetTrackerProcessor) DeleteOmsetTracker(ctx context.Context, id uuid.UUID) error {
	// Get existing omset tracker
	_, err := p.omsetTrackerRepo.GetByID(ctx, id)
	if err != nil {
		return fmt.Errorf("omset tracker not found: %w", err)
	}

	// Delete omset tracker
	err = p.omsetTrackerRepo.Delete(ctx, id)
	if err != nil {
		return fmt.Errorf("failed to delete omset tracker: %w", err)
	}

	return nil
}

// AddOmset adds omset to a specific period
func (p *OmsetTrackerProcessor) AddOmset(ctx context.Context, periodType string, periodStart, periodEnd time.Time, amount int64, gameID *uuid.UUID) (*models.OmsetTrackerResponse, error) {
	if amount <= 0 {
		return nil, fmt.Errorf("amount must be greater than 0")
	}

	// Convert string to PeriodType
	periodTypeEnum := entities.PeriodType(periodType)

	// Get or create period tracker
	omsetTracker, err := p.omsetTrackerRepo.GetOrCreatePeriod(ctx, periodTypeEnum, periodStart, periodEnd, gameID)
	if err != nil {
		return nil, fmt.Errorf("failed to get or create period tracker: %w", err)
	}

	// Add omset
	err = p.omsetTrackerRepo.AddOmset(ctx, periodTypeEnum, periodStart, periodEnd, amount, gameID)
	if err != nil {
		return nil, fmt.Errorf("failed to add omset: %w", err)
	}

	// Get updated tracker
	updatedTracker, err := p.omsetTrackerRepo.GetByID(ctx, omsetTracker.ID)
	if err != nil {
		return nil, fmt.Errorf("failed to get updated tracker: %w", err)
	}

	return mappers.ToOmsetTrackerResponse(updatedTracker), nil
}