package gio

import (
	"fmt"

	"gioui.org/io/semantic"
	"gioui.org/layout"
	"gioui.org/unit"
	"gioui.org/widget/material"

	"softbox.local/core/application"
)

func (shell *AppShell) layoutLicensePanel(gtx layout.Context, theme *material.Theme) layout.Dimensions {
	return layout.Flex{Axis: layout.Vertical}.Layout(
		gtx,
		layout.Rigid(material.H5(theme, "授权").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),
		layout.Rigid(func(gtx layout.Context) layout.Dimensions {
			return licenseText(gtx, theme, shell.licenseStatusText())
		}),
		layout.Rigid(layout.Spacer{Height: unit.Dp(12)}.Layout),
		layout.Rigid(func(gtx layout.Context) layout.Dimensions {
			if shell.authorization.MachineHash == "" {
				return licenseText(gtx, theme, "机器信息：授权配置完成后显示 machine_hash")
			}
			return licenseText(gtx, theme, "机器信息（machine_hash）："+shell.authorization.MachineHash)
		}),
		layout.Rigid(layout.Spacer{Height: unit.Dp(12)}.Layout),
		layout.Rigid(func(gtx layout.Context) layout.Dimensions {
			if !shell.canImportLicense() {
				return licenseText(gtx, theme, "许可证导入：当前构建未配置可信授权来源")
			}
			return shell.layoutLicenseImportButton(gtx, theme)
		}),
		layout.Rigid(layout.Spacer{Height: unit.Dp(16)}.Layout),
		layout.Rigid(material.H6(theme, "已授权产品").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),
		layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
			if len(shell.authorization.Products) == 0 {
				return licenseText(gtx, theme, "暂无可用授权。试用功能需要服务端签发可验证的许可证，本机不会创建试用授权。")
			}
			return layout.Flex{Axis: layout.Vertical}.Layout(gtx, licenseProductWidgets(shell.authorization.Products, theme)...)
		}),
	)
}

func (shell *AppShell) layoutLicenseImportButton(gtx layout.Context, theme *material.Theme) layout.Dimensions {
	gtx.Constraints.Min.Y = gtx.Dp(unit.Dp(44))
	button := material.Button(theme, &shell.importLicense, "导入许可证")
	button.Background = shellColors.primary
	button.Color = shellColors.onPrimary
	button.Inset = layout.Inset{Top: unit.Dp(10), Bottom: unit.Dp(10), Left: unit.Dp(14), Right: unit.Dp(14)}
	semantic.Button.Add(gtx.Ops)
	semantic.DescriptionOp("导入许可证文件，验证在后台完成").Add(gtx.Ops)
	return button.Layout(gtx)
}

func licenseProductWidgets(products []application.AuthorizedProduct, theme *material.Theme) []layout.FlexChild {
	widgets := make([]layout.FlexChild, 0, len(products)*3)
	for _, product := range products {
		product := product
		widgets = append(widgets,
			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
				return licenseText(gtx, theme, fmt.Sprintf("%s · %s", product.ProductID, licenseKindText(product.Kind)))
			}),
			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
				return licenseText(gtx, theme, "换绑/申诉："+product.RebindPolicy+"；不会在本机修改绑定")
			}),
			layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
		)
	}
	return widgets
}

func (shell *AppShell) canImportLicense() bool {
	return shell.authorizationLoaded && shell.authorization.State != application.AuthorizationStateUnconfigured
}

func (shell *AppShell) licenseStatusText() string {
	if !shell.authorizationLoaded {
		return "授权状态：正在加载"
	}
	switch shell.authorization.State {
	case application.AuthorizationStateReady:
		return "授权状态：撤销名单有效，当前授权可用"
	case application.AuthorizationStateGrace:
		return "授权状态：撤销名单已过期，处于 7 天离线宽限期"
	case application.AuthorizationStateNoLicense:
		return "授权状态：未找到当前机器的有效许可证"
	case application.AuthorizationStateRevoked:
		return "授权状态：许可证已撤销，不能启动受保护软件"
	case application.AuthorizationStateUnavailable:
		return "授权状态：撤销验证不可用，不能启动受保护软件"
	case application.AuthorizationStateImportFailed:
		return "授权状态：导入失败；原许可证与授权状态未被信任地替换"
	case application.AuthorizationStateUnconfigured:
		return "授权状态：可信授权来源尚未配置"
	default:
		return "授权状态：不可用"
	}
}

func licenseKindText(kind application.LicenseKind) string {
	if kind == application.LicenseKindPerpetual {
		return "正式许可证"
	}
	return "非永久许可证（License v1 未提供试用到期信息）"
}

func licenseText(gtx layout.Context, theme *material.Theme, value string) layout.Dimensions {
	label := material.Body2(theme, value)
	label.Color = shellColors.secondary
	return label.Layout(gtx)
}