package repository

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

	"github.com/google/uuid"
	"gorm.io/gorm"
)

type OmsetTrackerRepository struct {
	db *gorm.DB
}

func NewOmsetTrackerRepository(db *gorm.DB) *OmsetTrackerRepository {
	return &OmsetTrackerRepository{db: db}
}

func (r *OmsetTrackerRepository) Create(ctx context.Context, omsetTracker *entities.OmsetTracker) error {
	return r.db.WithContext(ctx).Create(omsetTracker).Error
}

func (r *OmsetTrackerRepository) GetByID(ctx context.Context, id uuid.UUID) (*entities.OmsetTracker, error) {
	var omsetTracker entities.OmsetTracker
	err := r.db.WithContext(ctx).Preload("Game").Where("id = ?", id).First(&omsetTracker).Error
	if err != nil {
		return nil, err
	}
	return &omsetTracker, nil
}

func (r *OmsetTrackerRepository) List(ctx context.Context, offset, limit int, search, periodType string, gameID *uuid.UUID, from, to *time.Time, sortBy, sortOrder string) ([]entities.OmsetTracker, int64, error) {
	var omsetTrackers []entities.OmsetTracker
	var total int64

	query := r.db.WithContext(ctx).Preload("Game")

	if search != "" {
		searchTerm := "%" + search + "%"
		query = query.Joins("LEFT JOIN games ON omset_tracker.game_id = games.id").
			Where("games.name ILIKE ?", searchTerm)
	}

	if periodType != "" {
		query = query.Where("period_type = ?", periodType)
	}

	if gameID != nil {
		query = query.Where("game_id = ?", *gameID)
	}

	if from != nil {
		query = query.Where("period_start >= ?", *from)
	}

	if to != nil {
		query = query.Where("period_end <= ?", *to)
	}

	if err := query.Model(&entities.OmsetTracker{}).Count(&total).Error; err != nil {
		return nil, 0, err
	}

	if sortBy != "" {
		if sortOrder == "" {
			sortOrder = "asc"
		}
		query = query.Order(fmt.Sprintf("omset_tracker.%s %s", sortBy, sortOrder))
	} else {
		query = query.Order("omset_tracker.period_start DESC")
	}

	err := query.Offset(offset).Limit(limit).Find(&omsetTrackers).Error
	if err != nil {
		return nil, 0, err
	}

	return omsetTrackers, total, nil
}

func (r *OmsetTrackerRepository) Update(ctx context.Context, omsetTracker *entities.OmsetTracker) error {
	return r.db.WithContext(ctx).Save(omsetTracker).Error
}

func (r *OmsetTrackerRepository) Delete(ctx context.Context, id uuid.UUID) error {
	return r.db.WithContext(ctx).Delete(&entities.OmsetTracker{}, id).Error
}

func (r *OmsetTrackerRepository) AddOmset(ctx context.Context, periodType entities.PeriodType, periodStart, periodEnd time.Time, amount int64, gameID *uuid.UUID) error {
	return r.db.WithContext(ctx).Model(&entities.OmsetTracker{}).
		Where("period_type = ? AND period_start = ? AND period_end = ? AND game_id = ?", periodType, periodStart, periodEnd, gameID).
		Update("total", gorm.Expr("total + ?", amount)).Error
}

func (r *OmsetTrackerRepository) GetOrCreatePeriod(ctx context.Context, periodType entities.PeriodType, periodStart, periodEnd time.Time, gameID *uuid.UUID) (*entities.OmsetTracker, error) {
	var omsetTracker entities.OmsetTracker

	err := r.db.WithContext(ctx).Preload("Game").
		Where("period_type = ? AND period_start = ? AND period_end = ? AND game_id = ?", periodType, periodStart, periodEnd, gameID).
		First(&omsetTracker).Error

	if err == nil {
		return &omsetTracker, nil
	}

	if err != gorm.ErrRecordNotFound {
		return nil, err
	}

	// Create new period
	newOmsetTracker := &entities.OmsetTracker{
		PeriodType:  periodType,
		PeriodStart: periodStart,
		PeriodEnd:   periodEnd,
		Total:       0,
		GameID:      gameID,
	}

	err = r.Create(ctx, newOmsetTracker)
	if err != nil {
		return nil, err
	}

	return newOmsetTracker, nil
}

func (r *OmsetTrackerRepository) GetPeriodSummary(ctx context.Context, periodType entities.PeriodType, from, to time.Time) (map[string]interface{}, error) {
	var summary map[string]interface{}

	query := r.db.WithContext(ctx).Model(&entities.OmsetTracker{}).
		Select("SUM(total) as total_omset, COUNT(*) as period_count").
		Where("period_type = ?", periodType)

	if !from.IsZero() {
		query = query.Where("period_start >= ?", from)
	}

	if !to.IsZero() {
		query = query.Where("period_end <= ?", to)
	}

	err := query.Scan(&summary).Error
	if err != nil {
		return nil, err
	}

	return summary, nil
}