package fallbackStyle

import "io"
import "bytes"
import "image"
import _ "embed"
import _ "image/png"
import "image/color"
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/event"
import "git.tebibyte.media/tomo/backend/style"

var colorFocus                 = color.RGBA { R:  61, G: 128, B: 143, A: 255 }
var colorInput                 = color.RGBA { R: 208, G: 203, B: 150, A: 255 }
var colorCarved                = color.RGBA { R: 151, G: 160, B: 150, A: 255 }
var colorGutter                = color.RGBA { R: 116, G: 132, B: 126, A: 255 }
var colorShadow                = color.RGBA { R:  57, G:  59, B:  57, A: 255 }
var colorShade                 = color.RGBA {                         A: 128 }
var colorInputShadow           = color.RGBA { R: 143, G: 146, B:  91, A: 255 }
var colorHighlight             = color.RGBA { R: 207, G: 215, B: 210, A: 255 }
var colorBackground            = color.RGBA { R: 169, G: 171, B: 168, A: 255 }
var colorCarvedPressed         = color.RGBA { R: 129, G: 142, B: 137, A: 255 }
var colorForeground            = color.Black
var colorOutline               = color.Black
var colorCalendarWeekdayHeader = color.RGBA { R: 194, G: 162, B: 132, A: 255 }
var colorCalendarWeekend       = color.RGBA { R: 165, G: 185, B: 120, A: 255 }
var colorCalendarDay           = color.RGBA { R: 194, G: 189, B: 132, A: 255 }
var colorInactive              = color.RGBA { R: 131, G: 147, B: 134, A: 255 }

var outline = tomo.Border {
	Width: tomo.I(1),
	Color: [4]color.Color {
		colorOutline,
		colorOutline,
		colorOutline,
		colorOutline,
	},
}

var borderColorOutline  = [4]color.Color { colorOutline,     colorOutline,   colorOutline,   colorOutline     }
var borderColorEngraved = [4]color.Color { colorShadow,      colorHighlight, colorHighlight, colorShadow      }
var borderColorLifted   = [4]color.Color { colorHighlight,   colorShadow,    colorShadow,    colorHighlight   }
var borderColorInput    = [4]color.Color { colorInputShadow, colorInput,     colorInput,     colorInputShadow }
var borderColorFocused  = [4]color.Color { colorFocus,       colorFocus,     colorFocus,     colorFocus       }
var borderColorShade    = [4]color.Color { colorShade,       colorShade,     colorShade,     colorShade       }

//go:embed assets/atlas.png
var atlasBytes []byte

type closerCookie struct { io.Closer }
func (cookie closerCookie) Close () { cookie.Closer.Close() }
func newCloserCookie (closer io.Closer) event.Cookie {
	return closerCookie { Closer: closer }
}

// New returns Wintergreen, the default Tomo style. It is neutral-gray with
// green and turquoise accents.
func New () (*style.Style, event.Cookie) {
	atlasImage, _, err := image.Decode(bytes.NewReader(atlasBytes))
	if err != nil { panic(err) }
	atlasTexture := tomo.NewTexture(atlasImage)
	
	textureCheckboxChecked  := atlasTexture.SubTexture(image.Rect( 0,  0, 12, 11))
	// textureCorkboard        := atlasTexture.SubTexture(image.Rect(16,  0, 28, 12))
	textureTearLine         := atlasTexture.SubTexture(image.Rect(16, 12, 18, 13))
	textureHandleVertical   := atlasTexture.SubTexture(image.Rect(28,  0, 29,  2))
	textureHandleHorizontal := atlasTexture.SubTexture(image.Rect(28,  0, 30,  1))

	cookie := event.MultiCookie(newCloserCookie(atlasTexture))

rules := []style.Rule {
	// *.*
	style.Ru(style.AS (
		tomo.ATextColor (tomo.ColorForeground),
		tomo.ADotColor  (tomo.ColorAccent    ),
		tomo.AGap       (8, 8                ),
	), tomo.R("", "")),

	// *.Button
	style.Ru(style.AS (
		tomo.AttrBorder {
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorLifted,
			},
		},
		tomo.AttrPadding(tomo.I(4, 8)),
		tomo.AttrColor { Color: tomo.ColorRaised },
	), tomo.R("", "Button")),

	// *.Button[focused]
	style.Ru(style.AS (
		tomo.AttrBorder {
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorFocused,
			},
		},
	), tomo.R("", "Button"), "focused"),
	
	// *.Button[pressed]
	style.Ru(style.AS (
		tomo.AttrBorder {
			outline,
			tomo.Border {
				Width: tomo.I(1, 0, 0, 1),
				Color: borderColorEngraved,
			},
		},
		tomo.AttrPadding(tomo.I(5, 8, 4, 9)),
		tomo.AttrColor { Color: colorCarvedPressed },
	), tomo.R("", "Button"), "pressed"),

	// *.TextInput
	style.Ru(style.AS (
		tomo.ABorder (
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorInput,
			}),
		tomo.AColor(colorInput),
		tomo.APadding(5, 4, 4, 5),
	), tomo.R("", "TextInput")),

	// *.TextInput[focused]
	style.Ru(style.AS (
		tomo.ABorder (
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorFocused,
			}),
	), tomo.R("", "TextInput"), "focused"),
	
	// *.TextView
	style.Ru(style.AS (
		tomo.ABorder (
			outline,
			tomo.Border {
				Width: tomo.I(1, 0, 0, 1),
				Color: borderColorEngraved,
			}),
		tomo.AColor(tomo.ColorSunken),
		tomo.APadding(8),
	), tomo.R("", "TextView")),
	
	// *.NumberInput
	style.Ru(style.AS (
		tomo.AGap(0, 0),
	), tomo.R("", "NumberInput")),

	// *.Container[sunken]
	style.Ru(style.AS (
		tomo.ABorder (
			outline,
			tomo.Border {
				Width: tomo.I(1, 0, 0, 1),
				Color: borderColorEngraved,
			}),
		tomo.AColor(tomo.ColorSunken),
		// tomo.ATexture(textureCorkboard),
		tomo.APadding(8),
	), tomo.R("", "Container"), "sunken"),

	// *.Container[outer]
	style.Ru(style.AS (
		tomo.AttrColor { Color: tomo.ColorBackground },
		tomo.AttrPadding(tomo.I(8)),
	), tomo.R("", "Container"), "outer"),

	// *.Container[menu]
	style.Ru(style.AS (
		tomo.AttrBorder {
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorLifted,
			},
		},
		tomo.AttrColor { Color: tomo.ColorBackground },
		tomo.AttrGap { },
	), tomo.R("", "Container"), "menu"),

	// *.Heading
	style.Ru(style.AS (
		tomo.AAlign(tomo.AlignMiddle, tomo.AlignMiddle),
	), tomo.R("", "Heading")),
	
	// *.Heading
	style.Ru(style.AS (
		tomo.APadding(4, 8),
	), tomo.R("", "Heading"), "menu"),

	// *.Separator
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorEngraved,
			},
		},
	), tomo.R("", "Separator")),

	// *.Slider
	style.Ru(style.AS (
		tomo.AttrBorder {
			outline,
			tomo.Border {
				Width: tomo.I(1, 0, 0, 1),
				Color: borderColorEngraved,
			},
		},
		tomo.AttrColor { Color: colorGutter },
		tomo.AttrPadding(tomo.I(0, 1, 1, 0)),
	), tomo.R("", "Slider")),
	
	// *.Slider[focused]
	style.Ru(style.AS (
		tomo.ABorder (
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorFocused,
			}),
		tomo.APadding(0),
	), tomo.R("", "Slider"), "focused"),
	
	// *.Slider[horizontal]
	style.Ru(style.AS (
		tomo.AMinimumSize(48, 0),
	), tomo.R("", "Slider"), "horizontal"),
	
	// *.Slider[vertical]
	style.Ru(style.AS (
		tomo.AMinimumSize(0, 48),
	), tomo.R("", "Slider"), "vertical"),

	// *.SliderHandle
	style.Ru(style.AS (
		tomo.ABorder (
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorLifted,
			},
			tomo.Border {
				Width: tomo.I(1),
				Color: [4]color.Color {
					tomo.ColorRaised, tomo.ColorRaised,
					tomo.ColorRaised, tomo.ColorRaised,
				},
			}),
		tomo.AColor(nil),
		tomo.ATexture(textureHandleVertical),
		tomo.AMinimumSize(12, 12),
	), tomo.R("", "SliderHandle")),

	// *.SliderHandle[horizontal]
	style.Ru(style.AS (
		tomo.ATexture(textureHandleHorizontal),
	), tomo.R("", "SliderHandle"), "horizontal"),

	// *.ScrollContainer
	style.Ru(style.AS (
		tomo.AGap(0, 0),
	), tomo.R("", "ScrollContainer")),

	// *.Checkbox
	style.Ru(style.AS (
		tomo.ABorder (
			outline,
			tomo.Border {
				Width: tomo.I(1, 0, 0, 1),
				Color: borderColorEngraved,
			}),
		tomo.AColor(tomo.ColorSunken),
		tomo.APadding(0, 1, 1, 0),
		tomo.AMinimumSize(19, 19),
		tomo.ATexture(nil),
		tomo.ATextureMode(tomo.TextureModeCenter),
	), tomo.R("", "Checkbox")),

	// *.Checkbox[focused]
	style.Ru(style.AS (
		tomo.ABorder (
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorFocused,
			}),
		tomo.APadding(0),
	), tomo.R("", "Checkbox"), "focused"),

	// *.Checkbox[checked]
	style.Ru(style.AS (
		tomo.ATexture(textureCheckboxChecked),
	), tomo.R("", "Checkbox"), "checked"),

	// *.MenuItem
	style.Ru(style.AS (
		tomo.AttrPadding(tomo.I(4)),
		tomo.AttrGap { X: 4, Y: 4 },
		tomo.AttrColor { Color: color.Transparent },
	), tomo.R("", "MenuItem")),

	// *MenuItem[focused]
	style.Ru(style.AS (
		tomo.AttrColor { Color: tomo.ColorAccent },
	), tomo.R("", "MenuItem"), "focused"),
	
	// *.MenuItem[hovered]
	style.Ru(style.AS (
		tomo.AttrColor { Color: tomo.ColorAccent },
	), tomo.R("", "MenuItem"), "hovered"),

	// *.File
	style.Ru(style.AS (
		tomo.AttrColor { Color: color.Transparent },
	), tomo.R("", "File")),

	// *.File[focused]
	style.Ru(style.AS (
		tomo.AttrColor { Color: tomo.ColorAccent },
	), tomo.R("", "File"), "focused"),

	// *.TearLine
	style.Ru(style.AS (
		tomo.ABorder (
			tomo.Border {
				Width: tomo.I(3),
				Color: [4]color.Color {
					color.Transparent,
					color.Transparent,
					color.Transparent,
					color.Transparent,
				},
			}),
		tomo.ATexture(textureTearLine),
		tomo.APadding(1, 0, 0, 1),
	), tomo.R("", "TearLine")),

	// *.TearLine[focused]
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(3),
				Color: borderColorFocused,
			},
		},
	), tomo.R("", "TearLine"), "focused"),

	// *.TearLine[hovered]
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(3),
				Color: borderColorFocused,
			},
		},
	), tomo.R("", "TearLine"), "hovered"),
	
	// *.Calendar
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(0, 1, 1, 0),
				Color: borderColorShade,
			},
			outline,
		},
		tomo.AttrColor { Color: colorInput },
		tomo.AttrPadding(tomo.I(2)),
		tomo.AttrGap { X: 2, Y: 2 },
	), tomo.R("", "Calendar")),
	
	// *.CalendarGrid
	style.Ru(style.AS (
		tomo.AttrGap { X: 2, Y: 2 },
	), tomo.R("", "CalendarGrid")),
	
	// *.CalendarWeekdayHeader
	style.Ru(style.AS (
		tomo.AttrPadding(tomo.I(2)),
		tomo.AttrColor { Color: colorCalendarWeekdayHeader },
	), tomo.R("", "CalendarWeekdayHeader")),
	
	// *.CalendarDay[weekday]
	style.Ru(style.AS (
		tomo.AttrPadding(tomo.I(2)),
		tomo.AttrMinimumSize { X: 32, Y: 32 },
		tomo.AttrColor { Color: colorCalendarDay },
	), tomo.R("", "CalendarDay"), "weekday"),

	// *.CalendarDay[weekend]
	style.Ru(style.AS (
		tomo.AttrPadding(tomo.I(2)),
		tomo.AttrMinimumSize { X: 32, Y: 32 },
		tomo.AttrColor { Color: colorCalendarWeekend },
	), tomo.R("", "CalendarDay"), "weekend"),
	
	// *.TabbedContainer
	style.Ru(style.AS (
		tomo.AGap(0, 0),
	), tomo.R("", "TabbedContainer")),
	
	// *.TabRow
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(1, 1, 0, 1),
				Color: borderColorOutline,
			},
			tomo.Border {
				Width: tomo.I(1, 0, 0, 1),
				Color: borderColorEngraved,
			},
		},
		tomo.AttrGap { X: 0, Y: 0 },
		tomo.AttrColor { Color: colorGutter },
		tomo.AttrPadding(tomo.I(1, 0, 0, 0)),
	), tomo.R("", "TabRow")),
	
	// *.TabSpacer[left]
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(0, 0, 1, 0),
				Color: borderColorEngraved,
			},
			tomo.Border {
				Width: tomo.I(0, 0, 1, 0),
				Color: borderColorOutline,
			},
		},
		tomo.AttrMinimumSize { X: 1 },
	), tomo.R("", "TabSpacer")),
	
	// *.TabSpacer[right]
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(1, 0, 0, 0),
				Color: [4]color.Color {
					colorGutter, colorGutter,
					colorGutter, colorGutter,
				},
			},
			tomo.Border {
				Width: tomo.I(0, 0, 1, 0),
				Color: borderColorEngraved,
			},
			tomo.Border {
				Width: tomo.I(0, 0, 1, 1),
				Color: borderColorOutline,
			},
			tomo.Border {
				Width: tomo.I(0, 0, 0, 1),
				Color: borderColorShade,
			},
		},
		tomo.AttrMinimumSize { X: 3 },
	), tomo.R("", "TabSpacer"), "right"),
	
	// *.Tab
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(1, 0, 0, 0),
				Color: [4]color.Color {
					colorGutter, colorGutter,
					colorGutter, colorGutter,
				},
			},
			tomo.Border {
				Width: tomo.I(0, 0, 1, 0),
				Color: borderColorEngraved,
			},
			tomo.Border {
				Width: tomo.I(1, 0, 1, 1),
				Color: borderColorOutline,
			},
			tomo.Border {
				Width: tomo.I(1, 1, 0, 1),
				Color: borderColorLifted,
			},
		},
		tomo.AttrPadding(tomo.I(4, 8, 4, 8)),
		tomo.AttrColor { Color: tomo.ColorRaised },
	), tomo.R("", "Tab")),
	
	// *.Tab[active]
	style.Ru(style.AS (
		tomo.AttrBorder {
			tomo.Border {
				Width: tomo.I(1, 0, 0, 1),
				Color: borderColorOutline,
			},
			tomo.Border {
				Width: tomo.I(1, 1, 0, 1),
				Color: borderColorLifted,
			},
		},
		tomo.AttrPadding(tomo.I(4, 8, 7, 8)),
		tomo.AttrColor { Color: tomo.ColorBackground },
	), tomo.R("", "Tab"), "active"),

	// *.Swatch
	style.Ru(style.AS (
		tomo.AttrBorder {
			outline,
		},
		tomo.AttrMinimumSize { X: 19, Y: 19 },
	), tomo.R("", "Swatch")),

	// *.Swatch[focused]
	style.Ru(style.AS (
		tomo.AttrBorder {
			outline,
			tomo.Border {
				Width: tomo.I(1),
				Color: borderColorFocused,
			},
		},
	), tomo.R("", "Swatch"), "focused"),

	// *.ColorPickerMap
	style.Ru(style.AS (
		tomo.AttrBorder {
			outline,
			tomo.Border {
				Width: tomo.I(1, 0, 0, 1),
				Color: borderColorEngraved,
			},
		},
		tomo.AttrColor { Color: tomo.ColorSunken },
		tomo.AttrMinimumSize { X: 128, Y: 128 },
	), tomo.R("", "ColorPickerMap")),
}

	return &style.Style {
		Rules: rules,
		Colors: map[tomo.Color] color.Color {
			tomo.ColorBackground: colorBackground,
			tomo.ColorForeground: colorForeground,
			tomo.ColorRaised:     colorCarved,
			tomo.ColorSunken:     colorCarved,
			tomo.ColorAccent:     colorFocus,
		},
	}, cookie
}