package gio

import (
	"fmt"
	"strings"

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

	"softbox.local/core/application"
)

func (shell *AppShell) layoutDetail(
	gtx layout.Context,
	theme *material.Theme,
	item application.CatalogListItem,
) layout.Dimensions {
	shell.detailRendered = true
	return panel(
		gtx,
		shellColors.muted,
		unit.Dp(6),
		layout.UniformInset(unit.Dp(12)),
		func(gtx layout.Context) layout.Dimensions {
			return layout.Flex{Axis: layout.Vertical}.Layout(
				gtx,
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					return layout.Flex{Alignment: layout.Middle}.Layout(
						gtx,
						layout.Rigid(material.Body1(theme, "软件详情").Layout),
						layout.Flexed(1, layout.Spacer{}.Layout),
						layout.Rigid(func(gtx layout.Context) layout.Dimensions {
							return shell.layoutFilterButton(
								gtx,
								theme,
								&shell.closeDetail,
								"关闭",
								false,
							)
						}),
					)
				}),
				layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					return layout.Center.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
						return shell.layoutAppIcon(
							gtx,
							theme,
							item.ID,
							item.Name,
							unit.Dp(64),
							unit.Dp(7),
						)
					})
				}),
				layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					return layout.Center.Layout(gtx, material.Body1(theme, item.Name).Layout)
				}),
				layout.Rigid(layout.Spacer{Height: unit.Dp(3)}.Layout),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					label := material.Caption(
						theme,
						fmt.Sprintf("%s · %s", item.ID, item.Version),
					)
					label.Color = shellColors.secondary
					return layout.Center.Layout(gtx, label.Layout)
				}),
				layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					return detailField(gtx, theme, "状态", statusLabel(item.Status))
				}),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					return detailField(gtx, theme, "分类", fallbackText(item.Category, "未分类"))
				}),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					return detailField(
						gtx,
						theme,
						"标签",
						fallbackText(strings.Join(item.Tags, " · "), "无"),
					)
				}),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					return detailField(
						gtx,
						theme,
						"简介",
						fallbackText(item.Description, "暂无简介"),
					)
				}),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					if item.Reason == "" {
						return layout.Dimensions{}
					}
					return detailField(gtx, theme, "不可用原因", reasonLabel(item.Reason))
				}),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					if item.Tutorial == "" {
						return layout.Dimensions{}
					}
					return detailField(gtx, theme, "教程", item.Tutorial)
				}),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					if item.Homepage == "" {
						return layout.Dimensions{}
					}
					return detailField(gtx, theme, "主页", item.Homepage)
				}),
				layout.Rigid(func(gtx layout.Context) layout.Dimensions {
					label := material.Caption(theme, "实际安装/启动操作将在后续用例接入")
					label.Color = shellColors.secondary
					return label.Layout(gtx)
				}),
			)
		},
	)
}

func detailField(
	gtx layout.Context,
	theme *material.Theme,
	labelText string,
	value string,
) layout.Dimensions {
	return layout.Inset{Bottom: unit.Dp(8)}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
		return layout.Flex{Axis: layout.Vertical}.Layout(
			gtx,
			layout.Rigid(func(gtx layout.Context) layout.Dimensions {
				label := material.Caption(theme, labelText)
				label.Color = shellColors.secondary
				return label.Layout(gtx)
			}),
			layout.Rigid(layout.Spacer{Height: unit.Dp(2)}.Layout),
			layout.Rigid(material.Caption(theme, value).Layout),
		)
	})
}

func fallbackText(value, fallback string) string {
	if value == "" {
		return fallback
	}
	return value
}

func reasonLabel(reason string) string {
	switch reason {
	case "deprecated":
		return "软件已停止发布"
	case "minimum_os":
		return "Windows 版本低于最低要求"
	case "architecture":
		return "没有当前架构的软件包"
	default:
		return reason
	}
}