package rui

import (
	"math"
	"strconv"
	"strings"
)

// Constants related to [NumberPicker] specific properties and events
const (
	// NumberChangedEvent is the constant for the "" property tag.
	// The "number-changed" property sets listener(s) that track the change in the entered value.
	NumberChangedEvent = "number-changed"

	// NumberPickerType is the constant for the "number-picker-type" property tag.
	// The "number-picker-type" int property sets the mode of NumberPicker. It can take the following values:
	// * NumberEditor (0) - NumberPicker is presented by editor. Default value;
	// * NumberSlider (1) - NumberPicker is presented by slider.                     |
	NumberPickerType = "number-picker-type"

	// NumberPickerMin is the constant for the "number-picker-min" property tag.
	// The "number-picker-min" int property sets the minimum value of NumberPicker. The default value is 0.
	NumberPickerMin = "number-picker-min"

	// NumberPickerMax is the constant for the "number-picker-max" property tag.
	// The "number-picker-max" int property sets the maximum value of NumberPicker. The default value is 1.
	NumberPickerMax = "number-picker-max"

	// NumberPickerStep is the constant for the "number-picker-step" property tag.
	// The "number-picker-step" int property sets the value change step of NumberPicker
	NumberPickerStep = "number-picker-step"

	// NumberPickerValue is the constant for the "number-picker-value" property tag.
	// The "number-picker-value" int property sets the current value of NumberPicker. The default value is 0.
	NumberPickerValue = "number-picker-value"
)

// Constants which describe values of the "number-picker-type" property of a [NumberPicker]
const (
	// NumberEditor - type of NumberPicker. NumberPicker is presented by editor
	NumberEditor = 0

	// NumberSlider - type of NumberPicker. NumberPicker is presented by slider
	NumberSlider = 1
)

// NumberPicker represents a NumberPicker view
type NumberPicker interface {
	View
}

type numberPickerData struct {
	viewData
	dataList
	numberChangedListeners []func(NumberPicker, float64, float64)
}

// NewNumberPicker create new NumberPicker object and return it
func NewNumberPicker(session Session, params Params) NumberPicker {
	view := new(numberPickerData)
	view.init(session)
	setInitParams(view, params)
	return view
}

func newNumberPicker(session Session) View {
	return NewNumberPicker(session, nil)
}

func (picker *numberPickerData) init(session Session) {
	picker.viewData.init(session)
	picker.tag = "NumberPicker"
	picker.hasHtmlDisabled = true
	picker.numberChangedListeners = []func(NumberPicker, float64, float64){}
	picker.dataListInit()
}

func (picker *numberPickerData) String() string {
	return getViewString(picker, nil)
}

func (picker *numberPickerData) Focusable() bool {
	return true
}

func (picker *numberPickerData) normalizeTag(tag string) string {
	tag = strings.ToLower(tag)
	switch tag {
	case Type, Min, Max, Step, Value:
		return "number-picker-" + tag
	}

	return picker.normalizeDataListTag(tag)
}

func (picker *numberPickerData) Remove(tag string) {
	picker.remove(picker.normalizeTag(tag))
}

func (picker *numberPickerData) remove(tag string) {
	switch tag {
	case NumberChangedEvent:
		if len(picker.numberChangedListeners) > 0 {
			picker.numberChangedListeners = []func(NumberPicker, float64, float64){}
			picker.propertyChangedEvent(tag)
		}

	case NumberPickerValue:
		oldValue := GetNumberPickerValue(picker)
		picker.viewData.remove(tag)
		if oldValue != 0 {
			if picker.created {
				picker.session.callFunc("setInputValue", picker.htmlID(), 0)
			}
			for _, listener := range picker.numberChangedListeners {
				listener(picker, 0, oldValue)
			}
			picker.propertyChangedEvent(tag)
		}

	case DataList:
		if len(picker.dataList.dataList) > 0 {
			picker.setDataList(picker, []string{}, true)
		}

	default:
		picker.viewData.remove(tag)
		picker.propertyChanged(tag)
	}
}

func (picker *numberPickerData) Set(tag string, value any) bool {
	return picker.set(picker.normalizeTag(tag), value)
}

func (picker *numberPickerData) set(tag string, value any) bool {
	if value == nil {
		picker.remove(tag)
		return true
	}

	switch tag {
	case NumberChangedEvent:
		listeners, ok := valueToEventWithOldListeners[NumberPicker, float64](value)
		if !ok {
			notCompatibleType(tag, value)
			return false
		} else if listeners == nil {
			listeners = []func(NumberPicker, float64, float64){}
		}
		picker.numberChangedListeners = listeners
		picker.propertyChangedEvent(tag)
		return true

	case NumberPickerValue:
		oldValue := GetNumberPickerValue(picker)
		min, max := GetNumberPickerMinMax(picker)
		if picker.setFloatProperty(NumberPickerValue, value, min, max) {
			if f, ok := floatProperty(picker, NumberPickerValue, picker.Session(), min); ok && f != oldValue {
				newValue, _ := floatTextProperty(picker, NumberPickerValue, picker.Session(), min)
				if picker.created {
					picker.session.callFunc("setInputValue", picker.htmlID(), newValue)
				}
				for _, listener := range picker.numberChangedListeners {
					listener(picker, f, oldValue)
				}
				picker.propertyChangedEvent(tag)
			}
			return true
		}

	case DataList:
		return picker.setDataList(picker, value, picker.created)

	default:
		if picker.viewData.set(tag, value) {
			picker.propertyChanged(tag)
			return true
		}
	}
	return false
}

func (picker *numberPickerData) propertyChanged(tag string) {
	if picker.created {
		switch tag {
		case NumberPickerType:
			if GetNumberPickerType(picker) == NumberSlider {
				picker.session.updateProperty(picker.htmlID(), "type", "range")
			} else {
				picker.session.updateProperty(picker.htmlID(), "type", "number")
			}

		case NumberPickerMin:
			min, _ := GetNumberPickerMinMax(picker)
			picker.session.updateProperty(picker.htmlID(), Min, strconv.FormatFloat(min, 'f', -1, 32))

		case NumberPickerMax:
			_, max := GetNumberPickerMinMax(picker)
			picker.session.updateProperty(picker.htmlID(), Max, strconv.FormatFloat(max, 'f', -1, 32))

		case NumberPickerStep:
			if step := GetNumberPickerStep(picker); step > 0 {
				picker.session.updateProperty(picker.htmlID(), Step, strconv.FormatFloat(step, 'f', -1, 32))
			} else {
				picker.session.updateProperty(picker.htmlID(), Step, "any")
			}
		}
	}
}

func (picker *numberPickerData) Get(tag string) any {
	return picker.get(picker.normalizeTag(tag))
}

func (picker *numberPickerData) get(tag string) any {
	switch tag {
	case NumberChangedEvent:
		return picker.numberChangedListeners

	case DataList:
		return picker.dataList.dataList

	default:
		return picker.viewData.get(tag)
	}
}

func (picker *numberPickerData) htmlTag() string {
	return "input"
}

func (picker *numberPickerData) htmlSubviews(self View, buffer *strings.Builder) {
	picker.dataListHtmlSubviews(self, buffer)
}

func (picker *numberPickerData) htmlProperties(self View, buffer *strings.Builder) {
	picker.viewData.htmlProperties(self, buffer)

	if GetNumberPickerType(picker) == NumberSlider {
		buffer.WriteString(` type="range"`)
	} else {
		buffer.WriteString(` type="number"`)
	}

	min, max := GetNumberPickerMinMax(picker)
	if min != math.Inf(-1) {
		buffer.WriteString(` min="`)
		buffer.WriteString(strconv.FormatFloat(min, 'f', -1, 64))
		buffer.WriteByte('"')
	}

	if max != math.Inf(1) {
		buffer.WriteString(` max="`)
		buffer.WriteString(strconv.FormatFloat(max, 'f', -1, 64))
		buffer.WriteByte('"')
	}

	step := GetNumberPickerStep(picker)
	if step != 0 {
		buffer.WriteString(` step="`)
		buffer.WriteString(strconv.FormatFloat(step, 'f', -1, 64))
		buffer.WriteByte('"')
	} else {
		buffer.WriteString(` step="any"`)
	}

	buffer.WriteString(` value="`)
	buffer.WriteString(strconv.FormatFloat(GetNumberPickerValue(picker), 'f', -1, 64))
	buffer.WriteByte('"')

	buffer.WriteString(` oninput="editViewInputEvent(this)"`)

	picker.dataListHtmlProperties(picker, buffer)
}

func (picker *numberPickerData) handleCommand(self View, command string, data DataObject) bool {
	switch command {
	case "textChanged":
		if text, ok := data.PropertyValue("text"); ok {
			if value, err := strconv.ParseFloat(text, 32); err == nil {
				oldValue := GetNumberPickerValue(picker)
				picker.properties[NumberPickerValue] = text
				if value != oldValue {
					for _, listener := range picker.numberChangedListeners {
						listener(picker, value, oldValue)
					}
				}
			}
		}
		return true
	}

	return picker.viewData.handleCommand(self, command, data)
}

// GetNumberPickerType returns the type of NumberPicker subview. Valid values:
// NumberEditor (0) - NumberPicker is presented by editor (default type);
// NumberSlider (1) - NumberPicker is presented by slider.
// If the second argument (subviewID) is not specified or it is "" then a value from the first argument (view) is returned.
func GetNumberPickerType(view View, subviewID ...string) int {
	return enumStyledProperty(view, subviewID, NumberPickerType, NumberEditor, false)
}

// GetNumberPickerMinMax returns the min and max value of NumberPicker subview.
// If the second argument (subviewID) is not specified or it is "" then a value from the first argument (view) is returned.
func GetNumberPickerMinMax(view View, subviewID ...string) (float64, float64) {
	var pickerType int
	if len(subviewID) > 0 && subviewID[0] != "" {
		pickerType = GetNumberPickerType(view, subviewID[0])
	} else {
		pickerType = GetNumberPickerType(view)
	}

	var defMin, defMax float64
	if pickerType == NumberSlider {
		defMin = 0
		defMax = 1
	} else {
		defMin = math.Inf(-1)
		defMax = math.Inf(1)
	}

	min := floatStyledProperty(view, subviewID, NumberPickerMin, defMin)
	max := floatStyledProperty(view, subviewID, NumberPickerMax, defMax)

	if min > max {
		return max, min
	}
	return min, max
}

// GetNumberPickerStep returns the value changing step of NumberPicker subview.
// If the second argument (subviewID) is not specified or it is "" then a value from the first argument (view) is returned.
func GetNumberPickerStep(view View, subviewID ...string) float64 {
	var max float64
	if len(subviewID) > 0 && subviewID[0] != "" {
		_, max = GetNumberPickerMinMax(view, subviewID[0])
	} else {
		_, max = GetNumberPickerMinMax(view)
	}

	result := floatStyledProperty(view, subviewID, NumberPickerStep, 0)
	if result > max {
		return max
	}
	return result
}

// GetNumberPickerValue returns the value of NumberPicker subview.
// If the second argument (subviewID) is not specified or it is "" then a value from the first argument (view) is returned.
func GetNumberPickerValue(view View, subviewID ...string) float64 {
	var min float64
	if len(subviewID) > 0 && subviewID[0] != "" {
		min, _ = GetNumberPickerMinMax(view, subviewID[0])
	} else {
		min, _ = GetNumberPickerMinMax(view)
	}

	result := floatStyledProperty(view, subviewID, NumberPickerValue, min)
	return result
}

// GetNumberChangedListeners returns the NumberChangedListener list of an NumberPicker subview.
// If there are no listeners then the empty list is returned
// If the second argument (subviewID) is not specified or it is "" then a value from the first argument (view) is returned.
func GetNumberChangedListeners(view View, subviewID ...string) []func(NumberPicker, float64, float64) {
	return getEventWithOldListeners[NumberPicker, float64](view, subviewID, NumberChangedEvent)
}