package appui

import (
	"image"

	"gioui.org/layout"
	"gioui.org/op"
	"gioui.org/op/paint"
	"gioui.org/unit"
	"gioui.org/widget"
	"gioui.org/widget/material"
	headerlayout "git.julianfamily.org/keepassgo/internal/appui/header/layout"
)

func (u *ui) header(gtx layout.Context) layout.Dimensions {
	if u.usesCompactViewport() {
		if u.shouldShowLifecycleSetup() || u.isVaultLocked() {
			return layout.Dimensions{}
		}
		gtx.Constraints.Min.X = gtx.Constraints.Max.X
		return u.headerActions(gtx)
	}
	if u.shouldShowDesktopWorkingHeader() {
		return layout.Dimensions{}
	}
	return card(gtx, func(gtx layout.Context) layout.Dimensions {
		return layout.Flex{Alignment: layout.Middle}.Layout(gtx,
			layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
				return u.brandMark(gtx, 196, 56)
			}),
			layout.Rigid(u.headerActions),
		)
	})
}

func (u *ui) headerActions(gtx layout.Context) layout.Dimensions {
	if u.shouldShowLifecycleSetup() || u.isVaultLocked() || u.shouldShowDesktopWorkingHeader() {
		return layout.Dimensions{}
	}
	spacing := gtx.Dp(unit.Dp(8))
	metrics := headerlayout.ActionMetrics{Spacing: spacing}
	row := func(gtx layout.Context) layout.Dimensions {
		return layout.Flex{Spacing: layout.SpaceStart}.Layout(gtx,
			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
				metrics.SyncDims = u.syncButtonGroup(gtx)
				return metrics.SyncDims
			}),
			layout.Rigid(layout.Spacer{Width: unit.Dp(8)}.Layout),
			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
				btn := material.Button(u.theme, &u.lockVault, "Lock")
				metrics.LockDims = btn.Layout(gtx)
				return metrics.LockDims
			}),
			layout.Rigid(layout.Spacer{Width: unit.Dp(8)}.Layout),
			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
				metrics.MainDims = u.mainMenuButtonGroup(gtx)
				return metrics.MainDims
			}),
		)
	}

	rowOps := op.Record(gtx.Ops)
	metrics.RowDims = row(gtx)
	rowCall := rowOps.Stop()

	if u.usesCompactViewport() {
		metrics.RowOriginX = max(0, gtx.Constraints.Max.X-metrics.RowDims.Size.X)
	}

	surface := headerlayout.DropdownSurface{ContainerWidth: gtx.Constraints.Max.X, LeftInset: 0, TopInset: 0}

	rowStack := op.Offset(image.Pt(metrics.RowOriginX, 0)).Push(gtx.Ops)
	rowCall.Add(gtx.Ops)
	rowStack.Pop()

	if u.usesCompactViewport() {
		if u.syncMenuOpen {
			u.phoneSyncMenuVisible = true
			u.phoneSyncMenuAnchor = metrics.SyncAnchor().Point()
		}
		if u.mainMenuOpen {
			u.phoneMainMenuVisible = true
			u.phoneMainMenuAnchor = metrics.MainAnchor().Point()
		}
		return layout.Dimensions{Size: image.Pt(gtx.Constraints.Max.X, metrics.RowDims.Size.Y)}
	}

	if u.syncMenuOpen {
		surface.Draw(gtx, metrics.SyncAnchor(), u.syncMenu)
	}
	if u.mainMenuOpen {
		surface.Draw(gtx, metrics.MainAnchor(), u.mainMenu)
	}

	return layout.Dimensions{Size: image.Pt(metrics.RowDims.Size.X, metrics.RowDims.Size.Y)}
}

func (u *ui) topRightActionOrder() []string {
	if u.isVaultLocked() {
		return nil
	}
	return []string{"Sync", "Lock", "Menu"}
}

func (u *ui) phoneHeaderMenus(gtx layout.Context) layout.Dimensions {
	if !u.usesCompactViewport() || (!u.syncMenuVisibleOnPhone() && !u.mainMenuVisibleOnPhone()) {
		return layout.Dimensions{}
	}
	gtx.Constraints.Min = gtx.Constraints.Max
	contentInsetPx := gtx.Dp(unit.Dp(16))
	surface := headerlayout.DropdownSurface{
		ContainerWidth: max(0, gtx.Constraints.Max.X-(contentInsetPx*2)),
		LeftInset:      contentInsetPx,
		TopInset:       contentInsetPx,
	}

	if u.syncMenuVisibleOnPhone() {
		surface.Draw(gtx, headerlayout.DropdownAnchor{TriggerRightX: u.phoneSyncMenuAnchor.X, TriggerBottomY: u.phoneSyncMenuAnchor.Y}, u.syncMenu)
	}
	if u.mainMenuVisibleOnPhone() {
		surface.Draw(gtx, headerlayout.DropdownAnchor{TriggerRightX: u.phoneMainMenuAnchor.X, TriggerBottomY: u.phoneMainMenuAnchor.Y}, u.mainMenu)
	}
	return layout.Dimensions{Size: gtx.Constraints.Max}
}

func (u *ui) syncMenuVisibleOnPhone() bool {
	return u.usesCompactViewport() && u.phoneSyncMenuVisible && u.syncMenuOpen
}

func (u *ui) mainMenuVisibleOnPhone() bool {
	return u.usesCompactViewport() && u.phoneMainMenuVisible && u.mainMenuOpen
}

func (u *ui) syncMenuDropsBelowTrigger() bool { return true }

func (u *ui) syncMenuRightAlignsToTrigger() bool { return true }

func (u *ui) headerMenusUseOverlayModel() bool { return true }

func (u *ui) mainMenuDropsBelowTrigger() bool { return true }

func (u *ui) mainMenuRightAlignsToTrigger() bool { return true }

func (u *ui) lifecycleBranding(gtx layout.Context) layout.Dimensions {
	if !u.usesCompactViewport() {
		return layout.Dimensions{}
	}
	return layout.Dimensions{}
}

func (u *ui) brandMark(gtx layout.Context, widthDP, heightDP float32) layout.Dimensions {
	if u.usesCompactViewport() {
		return u.brandImage(gtx, u.splashSquare, widthDP, heightDP)
	}
	return u.brandImage(gtx, u.logoHorizontal, widthDP, heightDP)
}

func (u *ui) brandImage(gtx layout.Context, src paint.ImageOp, widthDP, heightDP float32) layout.Dimensions {
	width := gtx.Dp(unit.Dp(widthDP))
	height := gtx.Dp(unit.Dp(heightDP))
	if width > gtx.Constraints.Max.X {
		width = gtx.Constraints.Max.X
	}
	if height > gtx.Constraints.Max.Y && gtx.Constraints.Max.Y > 0 {
		height = gtx.Constraints.Max.Y
	}
	img := widget.Image{
		Src:      src,
		Fit:      widget.Contain,
		Position: layout.W,
		Scale:    1.0 / gtx.Metric.PxPerDp,
	}
	gtx.Constraints.Min = image.Point{}
	gtx.Constraints.Max = image.Pt(width, height)
	return img.Layout(gtx)
}