package ui

import (
	"bytes"
	"encoding/base64"
	"errors"
	"fmt"
	"image"
	"image/png"

	"git.kirsle.net/go/render"
)

// ColorPicker is a Window that allows the user to pick out a color.
type ColorPicker struct {
	*Window

	// Config settings.
	Title      string
	Color      render.Color // initial color selection
	Supervisor *Supervisor
	Engine     render.Engine

	// Callback function in case the user wants to manually enter a hex color code.
	// Your program should prompt them by any means and return their chosen color.
	// Return a zero color (render.Invisible) to mean cancel.
	OnManualInput func(callback func(render.Color))

	then     func(render.Color) // .Then() callback
	cancel   func()             // .OnCancel() callback
	selected render.Color

	// SDL2 etc. structures that will need freed.
	tex render.Texturer
}

// DefaultColorPickerSize sets the default window size used in NewColorPicker
// unless the user specified overrides.
var DefaultColorPickerSize = render.Rect{W: 240, H: 190}

// NewColorPicker creates a new ColorPicker window. Specify the dimensions
// you want the window to appear in (width, height int) to specify a desired
// window size or else the default will be DefaultColorPickerSize.
func NewColorPicker(config ColorPicker, dimensions ...int) (*ColorPicker, error) {
	var size = DefaultColorPickerSize
	if len(dimensions) == 2 {
		size = render.NewRect(dimensions[0], dimensions[1])
	}

	// Validate settings.
	if config.Title == "" {
		config.Title = "Select a color"
	}
	if config.Supervisor == nil {
		return nil, errors.New("a ui.Supervisor is required")
	}
	if config.Engine == nil {
		return nil, errors.New("a render.Engine is required")
	}

	// Create the colorpicker window.
	window := NewWindow(config.Title)
	window.Resize(size)
	window.SetButtons(CloseButton)

	w := &ColorPicker{
		Title:         config.Title,
		Window:        window,
		Supervisor:    config.Supervisor,
		Engine:        config.Engine,
		Color:         config.Color,
		OnManualInput: config.OnManualInput,
	}

	window.Handle(CloseWindow, func(ed EventData) error {
		if w.cancel != nil {
			w.cancel()
		}
		return nil
	})

	if err := w.setup(); err != nil {
		return nil, err
	}

	w.Window.Supervise(w.Supervisor)
	w.Window.Hide()
	return w, nil
}

// Then is a callback function when the user has chosen a color.
func (w *ColorPicker) Then(callback func(render.Color)) {
	w.then = callback
}

// OnCancel is a callback to handle the ColorPicker being dismissed by the user.
func (w *ColorPicker) OnCancel(callback func()) {
	w.cancel = callback
}

// setup the main UI of the ColorPicker window.
func (w *ColorPicker) setup() error {
	// Load the color gradient image. Guaranteed not to error.
	if tex, err := w.Engine.StoreTexture("ui.ColorPicker/spectrum.png", MakeColorPickerGradient()); err != nil {
		return err
	} else {
		w.tex = tex
	}

	// Prepare values for the currently selected color.
	var (
		OriginalColor = w.Color
		CurrentColor  = w.Color
	)
	if OriginalColor.IsZero() {
		OriginalColor = render.Black
	}
	CurrentColor = OriginalColor
	w.selected = CurrentColor

	// Divide up the main frames.
	var (
		btnFrame  = NewFrame("Buttons")
		frame     = NewFrame("Main Frame")
		leftFrame = NewFrame("Content Frame")
	)

	// DEBUG
	// btnFrame.SetBackground(render.Yellow)
	// frame.SetBackground(render.Red)
	// leftFrame.SetBackground(render.Green)

	// The main frame vs. the button frame on bottom.
	w.Pack(frame, Pack{
		Side:   N,
		Fill:   true,
		Expand: true,
	})
	w.Pack(btnFrame, Pack{
		Side: N,
		PadY: 4,
	})

	// The left and right frames of the main frame.
	frame.Pack(leftFrame, Pack{
		Side:   N,
		Fill:   true,
		Expand: true,
	})

	////////
	// Buttons frame.
	{
		for _, config := range []struct {
			label    string
			callback func()
		}{
			{"Ok", func() {
				w.Destroy()
				if w.then != nil {
					w.then(w.selected)
				}
			}},
			{"Cancel", func() {
				if w.cancel != nil {
					w.cancel()
				}
				w.Destroy()
			}},
		} {
			config := config

			btn := NewButton(config.label, NewLabel(Label{
				Text: config.label,
				Font: DefaultFont.Update(render.Text{
					PadX: 8,
					PadY: 2,
				}),
			}))
			btn.Handle(Click, func(ed EventData) error {
				config.callback()
				return nil
			})
			w.Supervisor.Add(btn)
			btnFrame.Pack(btn, Pack{
				Side: W,
				PadX: 2,
			})
		}
	}

	/////////
	// Left frame.
	{
		// The gradient image up top.
		gradient, _ := ImageFromImage(MakeColorPickerGradient())
		leftFrame.Pack(gradient, Pack{
			Side: N,
			PadX: 2,
			PadY: 4,
		})

		// Below that: your Current Color | Original Color indicators.
		var (
			previewRow          = NewFrame("Color Preview")
			curColorFrame       = NewFrame("Current Color")
			origColorFrame      = NewFrame("Original Color")
			previewDividerFrame = NewFrame("Divider")
			hexLabel            = NewLabel(Label{
				Text: "    Hex color:",
				Font: DefaultFont,
			})
			hexButton = NewButton("Hex Button", NewLabel(Label{
				Text: w.selected.ToHex(),
				Font: DefaultFont.Update(render.Text{
					PadX: 6,
				}),
			}))
		)
		curColorFrame.Configure(Config{
			Width:       24,
			Height:      24,
			Background:  CurrentColor,
			BorderStyle: BorderSunken,
			BorderSize:  2,
			BorderColor: CurrentColor,
		})
		origColorFrame.Configure(Config{
			Width:       24,
			Height:      24,
			Background:  OriginalColor,
			BorderColor: OriginalColor,
			BorderSize:  2,
			BorderStyle: BorderSunken,
		})
		previewDividerFrame.Configure(Config{
			Width:       1,
			Height:      24,
			BorderStyle: BorderRaised,
			BorderSize:  2,
			BorderColor: render.Grey,
		})
		previewRow.Pack(curColorFrame, Pack{
			Side: W,
			PadX: 4,
		})
		previewRow.Pack(previewDividerFrame, Pack{
			Side: W,
		})
		previewRow.Pack(origColorFrame, Pack{
			Side: W,
			PadX: 4,
		})
		previewRow.Pack(hexLabel, Pack{
			Side: W,
		})
		previewRow.Pack(hexButton, Pack{
			Side: W,
			PadX: 4,
		})
		leftFrame.Pack(previewRow, Pack{
			Side:  N,
			FillX: true,
			PadX:  5,
		})

		// Bind clicks into the spectrum image to update the selected color.
		gradient.Handle(MouseMove, func(ed EventData) error {
			if ed.Clicked {
				point := ed.RelativePoint()

				color := render.FromColor(gradient.Image.At(point.X, point.Y))

				w.selected = color
				hexButton.SetText(color.ToHex())
				curColorFrame.Configure(Config{
					Background:  color,
					BorderColor: color,
				})
			}
			return nil
		})

		// Clicking the original color resets it.
		origColorFrame.Handle(Click, func(ed EventData) error {
			color := OriginalColor
			w.selected = color
			hexButton.SetText(color.ToHex())
			curColorFrame.Configure(Config{
				Background:  color,
				BorderColor: color,
			})
			return nil
		})

		// Clicking the Hex Button prompts the user to enter a hex code themselves.
		hexButton.Handle(Click, func(ed EventData) error {
			if w.OnManualInput != nil {
				w.OnManualInput(func(color render.Color) {
					if color.IsZero() {
						return
					}

					w.selected = color
					hexButton.SetText(color.ToHex())
					curColorFrame.Configure(Config{
						Background:  color,
						BorderColor: color,
					})
				})
			}
			return nil
		})

		w.Supervisor.Add(gradient)
		w.Supervisor.Add(origColorFrame)
		w.Supervisor.Add(hexButton)
	}

	return nil
}

// Compute the widget.
func (w *ColorPicker) Compute(e render.Engine) {
	// TODO: free the w.tex
}

// Destroy the ColorPicker widget. Call this instead of Hide() if you close the
// widget programmatically! It will free up SDL textures and so on.
func (w *ColorPicker) Destroy() {
	w.Hide()
}

// ColorPickerPreset shows the preset color buttons.
// Suggested to have 18 colors which is displayed in 2 rows of 9 buttons.
// More presets may need larger than default window size to fit.
var ColorPickerPreset = []string{
	// Row 1
	"#FFFFFF", // White
	"#CCCCCC", // Light grey
	"#FF0000", // Red
	"#FF9900", // Orange
	"#FFFF00", // Yellow
	"#00FF00", // Lime green
	"#00FFFF", // Cyan
	"#FF00FF", // Magenta
	"#FF9999", // Pastel red
	"#99FF99", // Pastel green

	// Row 2
	"#000000", // Black
	"#999999", // Dark grey
	"#990000", // Dark red
	"#996600", // Brown
	"#999900", // Gold
	"#009900", // Green
	"#009999", // Teal
	"#000099", // Dark Blue
	"#990099", // Purple
	"#9999FF", // Pastel blue
	"#FFFF99", // Pastel yellow
}

// Load the color spectrum image.
func MakeColorPickerGradient() image.Image {
	data, err := base64.StdEncoding.DecodeString(colorPickerGradient)
	if err != nil {
		fmt.Printf("ui.MakeColorPickerGradient: %s", err)
		return nil
	}

	// debug
	// ioutil.WriteFile("gradient.png", data, 0644)

	image, err := png.Decode(bytes.NewBuffer(data))
	if err != nil {
		fmt.Printf("ui.MakeColorPickerGradient: png.Decode: %s", err)
		return nil
	}

	return image
}

// colorPickerGradient holds Base64 PNG image data for the color picker graphic.
const colorPickerGradient = `iVBORw0KGgoAAAANSUhEUgAAAMgAAABkCAIAAABM5OhcAAAABGdBTUEAAK/INwWK6QAAABl0RVh0
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