package workout

import (
	"errors"
	"rideaware/pkg/database"
	"time"
	"gorm.io/gorm"
)

type Repository struct{}

func NewRepository() *Repository {
	return &Repository{}
}

func (r *Repository) CreateWorkout(workout *Workout) error {
	return database.DB.Create(workout).Error
}

func (r *Repository) GetWorkoutByID(id, userID uint) (*Workout, error) {
	var workout Workout
	if err := database.DB.Where("id = ? AND user_id = ?", id, userID).
		First(&workout).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, errors.New("workout not found")
		}
		return nil, err
	}
	return &workout, nil
}

func (r *Repository) GetUserWorkouts(userID uint) ([]Workout, error) {
	var workouts []Workout
	if err := database.DB.Where("user_id = ?", userID).
		Order("scheduled_date DESC").
		Find(&workouts).Error; err != nil {
		return nil, err
	}
	return workouts, nil
}

func (r *Repository) GetUserWorkoutsByTags(userID uint, tags []string) ([]Workout, error) {
	var workouts []Workout
	// Use PostgreSQL jsonb ?| operator to check if the tags array contains any of the given tags
	if err := database.DB.Where("user_id = ? AND tags ?| ?", userID, tags).
		Order("scheduled_date DESC").
		Find(&workouts).Error; err != nil {
		return nil, err
	}
	return workouts, nil
}

func (r *Repository) GetWorkoutsByDateRange(userID uint, start, end time.Time) ([]Workout, error) {
	var workouts []Workout
	if err := database.DB.Where("user_id = ? AND scheduled_date BETWEEN ? AND ?", userID, start, end).
		Order("scheduled_date ASC").
		Find(&workouts).Error; err != nil {
		return nil, err
	}
	return workouts, nil
}

func (r *Repository) GetWorkoutsByMonth(userID uint, year, month int) ([]Workout, error) {
	start := time.Date(year, time.Month(month), 1, 0, 0, 0, 0, time.UTC)
	end := start.AddDate(0, 1, 0).Add(-time.Second)
	return r.GetWorkoutsByDateRange(userID, start, end)
}

func (r *Repository) UpdateWorkout(workout *Workout) error {
	return database.DB.Model(workout).Updates(workout).Error
}

func (r *Repository) DeleteWorkout(id, userID uint) error {
	return database.DB.Where("id = ? AND user_id = ?", id, userID).
		Delete(&Workout{}).Error
}

func (r *Repository) RemoveDuplicates(userID uint) (int64, error) {
	// Find IDs to keep: the minimum ID for each (title, scheduled_date, duration) group
	// Delete all other workouts that are duplicates
	result := database.DB.Exec(`
		DELETE FROM workouts
		WHERE user_id = ? AND id NOT IN (
			SELECT MIN(id)
			FROM workouts
			WHERE user_id = ?
			GROUP BY title, scheduled_date, duration
		)
	`, userID, userID)
	if result.Error != nil {
		return 0, result.Error
	}
	return result.RowsAffected, nil
}

func (r *Repository) GetCompletedWorkoutOnDate(userID uint, date string) (*Workout, error) {
	var w Workout
	if err := database.DB.Where("user_id = ? AND status = 'completed' AND DATE(scheduled_date) = ?", userID, date).
		First(&w).Error; err != nil {
		return nil, err
	}
	return &w, nil
}

type EquipmentStat struct {
	EquipmentID   uint    `json:"equipment_id"`
	TotalRides    int     `json:"total_rides"`
	TotalDistance  float64 `json:"total_distance"`
	TotalDuration int     `json:"total_duration"`
}

func (r *Repository) GetEquipmentStats(userID uint) ([]EquipmentStat, error) {
	var stats []EquipmentStat
	if err := database.DB.Model(&Workout{}).
		Select("equipment_id, COUNT(*) as total_rides, COALESCE(SUM(distance), 0) as total_distance, COALESCE(SUM(duration), 0) as total_duration").
		Where("user_id = ? AND equipment_id IS NOT NULL", userID).
		Group("equipment_id").
		Scan(&stats).Error; err != nil {
		return nil, err
	}
	return stats, nil
}