package validation

import (

	"time"
	"fmt"
	"strconv"

	"bitbucket.org/nemt/nemt-portal-api/application/viewmodel"
	"bitbucket.org/nemt/nemt-portal-api/infra/errors"

)

const (
	tripTypeFromVisit			= "From Visit"
	tripTypeToVisit				= "To Visit"
	tripTypeFromVisitWillCall	= "From Visit / Will Call"
	tripTypeRoundTrip			= "Round Trip"
	tripTypeRountTripWillCall	= "Round Trip / Will Call"
)

const (
	loadingTime					= 30 //in minutes
	minimumLoadTime				= 30 //in minutes
	minimumPickupTime			= 10 //in minutes
)

const (
	hoursInDay					= 24
	hoursIn180Days				= 24*180
	time8Hours					= 8
	time10Minutes				= 10
)

func ValidateRide(requestRide *viewmodel.RideRequest, user *viewmodel.User) []errors.ValidationError {
	var result []errors.ValidationError

	//Step #1 validation

	if userID, err := strconv.Atoi(user.ID) ; err != nil || userID <= 0 {
		result = append(result, errors.ValidationError{Field : "user_uuid", Message : "Step #1 - Choose a Member" })
	}

	if originID, err := strconv.Atoi(requestRide.Origin.ID) ; err != nil || originID <= 0 {
		result = append (result, errors.ValidationError{Field : "origin.id", Message : "Step #1 - Choose a Pickup Address"})
	}

	if !requestRide.UserConsent {
		result = append (result, errors.ValidationError{Field : "user_consent", Message : "Step #1 - Member must consent to Terms of Use"})
	} 

	//Step #2 validation

	if destinationID, err := strconv.Atoi(requestRide.Destination.ID) ; err!= nil || destinationID <= 0 {
		result = append (result, errors.ValidationError{Field : "destination.id", Message : "Step #2 - Choose a Provider"})
	}

	//Step #3 validation

	isVisitDayToday := requestRide.VisitDate.Day() == time.Now().Day() && requestRide.VisitDate.Month() == time.Now().Month() && requestRide.VisitDate.Year() == time.Now().Year()
	before8Hours := time.Now().Add(-time.Hour*time8Hours)

	if requestRide.VisitDate == nil {
		result = append (result, errors.ValidationError{Field : "visit_date", Message : "Step #3 - Choose a Date for the Visit"})
	}else{
		dayBeforeToday := time.Now().Add(-time.Hour*hoursInDay)
		if requestRide.VisitDate.Before(dayBeforeToday) {
			result = append (result, errors.ValidationError{Field : "visit_date", Message : "Step #3 - Visit cannot occur more than one day before today"})
		}

		dayAfter180Days := time.Now().Add(time.Hour*hoursIn180Days)
		if requestRide.VisitDate.After(dayAfter180Days) {
			result = append (result, errors.ValidationError{Field : "visit_date", Message : "Step #3 - Visit cannot occur more than 180 days after today"})
		}

		if requestRide.VisitTime == nil {
			result = append (result, errors.ValidationError{Field : "visit_time", Message : "Step #3 - Choose a Time for the Visit"})
		}else{
			if isVisitDayToday && requestRide.VisitTime.Before(before8Hours) {
				result = append (result, errors.ValidationError{Field : "visit_time", Message : "Step #3 - Visit is more than 8 hours in the past"})
			}
		}
	}

	//Step #4 validation

	if requestRide.TripType.Value == "" {
		result = append (result, errors.ValidationError{Field : "trip_type.value", Message : "Step #4 - Choose a Trip Type"})
	}

	timeWithDurationAndLoadingTime := requestRide.VisitTime.Add(-time.Duration(requestRide.Duration)*time.Second).Add(-loadingTime*time.Minute)
	after10Minutes := time.Now().Add(time.Minute*time10Minutes)

	switch requestRide.TripType.Value {
		case tripTypeToVisit:
			if requestRide.PickupTime == nil {
				result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Choose a Pickup Time"})
			}else{
				if requestRide.PickupTime.After(*requestRide.VisitTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time must occur before Visit Time"})
				}
	
				if requestRide.PickupTime.After(timeWithDurationAndLoadingTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time less than required time before Visit Time"})
				}
	
				if isVisitDayToday && requestRide.PickupTime.Before(before8Hours) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Visit cannot occour in the past"})
				}
			}

		case tripTypeFromVisit :
			if requestRide.PickupTime == nil {
				result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Choose a Pickup Time"})
			}else{
				timeWithMinimumPickupTime := time.Now().Add(minimumPickupTime*time.Minute)
				if isVisitDayToday && requestRide.PickupTime.Before(timeWithMinimumPickupTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : fmt.Sprint("Step #4 - Time must be more than %d minutes from now",minimumPickupTime)})
				}

				if requestRide.PickupTime.Before(*requestRide.VisitTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time less than required time after Visit Time"})
				}

				timeWithMinimumLoadTime := time.Now().Add(minimumLoadTime*time.Minute)
				if requestRide.PickupTime.Before(timeWithMinimumLoadTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time less than Minimum Load Time before Visit Time"})
				}
			}

		case tripTypeFromVisitWillCall:
			//no special validation for this case

		case tripTypeRoundTrip:
			if requestRide.PickupTime == nil {
				result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Choose a Pickup Time"})
			}else{
				if requestRide.PickupTime.After(*requestRide.VisitTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time must occur before Visit Time"})
				}
	
				if requestRide.PickupTime.After(timeWithDurationAndLoadingTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time less than required time before Visit Time"})
				}
	
				if isVisitDayToday && requestRide.PickupTime.Before(after10Minutes) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time must be at least 10 minutes from now"})
				}
			}

			if requestRide.ReturnTime == nil {
				result = append (result, errors.ValidationError{Field : "return_time", Message : "Step #4 - Choose a Pickup Time"})
			}else{
				if isVisitDayToday {
					if requestRide.ReturnTime.Before(before8Hours) {
						result = append (result, errors.ValidationError{Field : "return_time", Message : "Step #4 - Return Time is more than 8 hours after Visit Time"})
					}
	
					if requestRide.ReturnTime.Before(after10Minutes) {
						result = append (result, errors.ValidationError{Field : "return_time", Message : "Step #4 - Return Time must be at least 10 minutes from now"})
					}
				}
			}

		case tripTypeRountTripWillCall:
			if requestRide.PickupTime == nil {
				result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Choose a Pickup Time"})
			}else{
				if requestRide.PickupTime.After(*requestRide.VisitTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time must occur before Visit Time"})
				}
	
				if requestRide.PickupTime.After(timeWithDurationAndLoadingTime) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Pickup Time less than required time after Visit Time"})
				}
	
				if isVisitDayToday && requestRide.PickupTime.Before(before8Hours) {
					result = append (result, errors.ValidationError{Field : "pickup_time", Message : "Step #4 - Visit cannot occur in the past "})
				}
			}
	}
	return result
}