package ui

import (
	"image/color"

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

type page uint8

const (
	pageInstances page = iota
	pageSettings
)

// InstanceRow is the read-only view model used by the first Gio shell.
// Runtime data will replace these fixtures when the application service is wired.
type InstanceRow struct {
	Name    string
	Browser string
	Profile string
	Status  string
}

type SettingsState struct {
	ChromePath  string
	EdgePath    string
	DefaultDir  string
	LogDir      string
	CloseOnExit bool
}

// Shell owns every interactive Gio widget. Keeping this state outside Layout
// prevents focus, editor content, and list scroll position from resetting.
type Shell struct {
	theme *material.Theme
	page  page

	instancesClick widget.Clickable
	settingsClick  widget.Clickable
	newClick       widget.Clickable
	startClick     widget.Clickable
	saveClick      widget.Clickable
	cancelClick    widget.Clickable

	chromePath  widget.Editor
	edgePath    widget.Editor
	dataDir     widget.Editor
	logDir      widget.Editor
	closeOnExit widget.Bool

	list   widget.List
	rows   []InstanceRow
	onSave func(SettingsState)
}

func NewShell(theme *material.Theme) *Shell {
	s := &Shell{theme: theme, rows: []InstanceRow{
		{Name: "运营主账号", Browser: "Chrome", Profile: "Default", Status: "运行中"},
		{Name: "广告投放", Browser: "Edge", Profile: "Profile 2", Status: "启动中"},
		{Name: "素材采集", Browser: "Chrome", Profile: "Default", Status: "外部占用"},
		{Name: "备用环境", Browser: "Edge", Profile: "Profile 1", Status: "已退出"},
	}}
	s.chromePath.SetText(`C:\Program Files\Google\Chrome\Application\chrome.exe`)
	s.edgePath.SetText(`C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe`)
	s.dataDir.SetText(`C:\Users\Public\chub\profiles`)
	s.logDir.SetText(`C:\Users\Public\chub\logs`)
	s.closeOnExit.Value = true
	return s
}

func (s *Shell) SetInstances(rows []InstanceRow) {
	if len(rows) == 0 {
		return
	}
	s.rows = append([]InstanceRow(nil), rows...)
}

func (s *Shell) SetSettings(value SettingsState) {
	s.chromePath.SetText(value.ChromePath)
	s.edgePath.SetText(value.EdgePath)
	s.dataDir.SetText(value.DefaultDir)
	s.logDir.SetText(value.LogDir)
	s.closeOnExit.Value = value.CloseOnExit
}

func (s *Shell) OnSave(fn func(SettingsState)) { s.onSave = fn }

func (s *Shell) Layout(gtx layout.Context) layout.Dimensions {
	for s.instancesClick.Clicked(gtx) {
		s.page = pageInstances
	}
	for s.settingsClick.Clicked(gtx) {
		s.page = pageSettings
	}
	return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
		layout.Rigid(s.header),
		layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
			return layout.Inset{Top: unit.Dp(20), Bottom: unit.Dp(20), Left: unit.Dp(28), Right: unit.Dp(28)}.Layout(gtx, s.content)
		}),
	)
}

func (s *Shell) header(gtx layout.Context) layout.Dimensions {
	return layout.Inset{Top: unit.Dp(18), Bottom: unit.Dp(10), Left: unit.Dp(28), Right: unit.Dp(28)}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
		return layout.Flex{Alignment: layout.Middle}.Layout(gtx,
			layout.Flexed(1, material.H5(s.theme, "Chub 浏览器管理").Layout),
			layout.Rigid(material.Button(s.theme, &s.instancesClick, "实例").Layout),
			layout.Rigid(layout.Spacer{Width: unit.Dp(8)}.Layout),
			layout.Rigid(material.Button(s.theme, &s.settingsClick, "设置").Layout),
		)
	})
}

func (s *Shell) content(gtx layout.Context) layout.Dimensions {
	if s.page == pageSettings {
		return s.settings(gtx)
	}
	return s.instances(gtx)
}

func (s *Shell) instances(gtx layout.Context) layout.Dimensions {
	return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
		layout.Rigid(material.H4(s.theme, "实例").Layout),
		layout.Rigid(material.Body1(s.theme, "统一查看、启动和管理 Chrome / Edge 浏览器进程").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(18)}.Layout),
		layout.Rigid(material.Button(s.theme, &s.newClick, "新建实例").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(16)}.Layout),
		layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
			return material.List(s.theme, &s.list).Layout(gtx, len(s.rows), func(gtx layout.Context, i int) layout.Dimensions {
				row := s.rows[i]
				return layout.Inset{Bottom: unit.Dp(10)}.Layout(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 layout.Flex{Axis: layout.Vertical}.Layout(gtx,
								layout.Rigid(material.Subtitle1(s.theme, row.Name).Layout),
								layout.Rigid(material.Caption(s.theme, row.Browser+" · "+row.Profile).Layout),
							)
						}),
						layout.Rigid(statusLabel(s.theme, row.Status)),
						layout.Rigid(layout.Spacer{Width: unit.Dp(16)}.Layout),
						layout.Rigid(material.Button(s.theme, &s.startClick, "启动").Layout),
					)
				})
			})
		}),
	)
}

func statusLabel(theme *material.Theme, status string) layout.Widget {
	style := material.Label(theme, unit.Sp(13), status)
	style.Color = map[string]color.NRGBA{
		"运行中":  {R: 24, G: 125, B: 78, A: 255},
		"启动中":  {R: 175, G: 105, B: 0, A: 255},
		"外部占用": {R: 190, G: 75, B: 35, A: 255},
		"已退出":  {R: 100, G: 105, B: 115, A: 255},
	}[status]
	return style.Layout
}

func (s *Shell) settings(gtx layout.Context) layout.Dimensions {
	for s.saveClick.Clicked(gtx) {
		if s.onSave != nil {
			s.onSave(SettingsState{ChromePath: s.chromePath.Text(), EdgePath: s.edgePath.Text(), DefaultDir: s.dataDir.Text(), LogDir: s.logDir.Text(), CloseOnExit: s.closeOnExit.Value})
		}
	}
	for s.cancelClick.Clicked(gtx) {
		s.resetSettings()
	}
	return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
		layout.Rigid(material.H4(s.theme, "设置").Layout),
		layout.Rigid(material.Body1(s.theme, "配置浏览器可执行文件、默认目录和本地运行行为").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(18)}.Layout),
		layout.Rigid(material.Editor(s.theme, &s.chromePath, "Chrome 可执行文件").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
		layout.Rigid(material.Editor(s.theme, &s.edgePath, "Edge 可执行文件").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
		layout.Rigid(material.Editor(s.theme, &s.dataDir, "默认 User Data Dir").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
		layout.Rigid(material.Editor(s.theme, &s.logDir, "日志目录").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
		layout.Rigid(material.CheckBox(s.theme, &s.closeOnExit, "退出时关闭托管浏览器").Layout),
		layout.Rigid(layout.Spacer{Height: unit.Dp(16)}.Layout),
		layout.Rigid(func(gtx layout.Context) layout.Dimensions {
			return layout.Flex{Alignment: layout.Middle}.Layout(gtx,
				layout.Rigid(material.Button(s.theme, &s.saveClick, "保存设置").Layout),
				layout.Rigid(layout.Spacer{Width: unit.Dp(8)}.Layout),
				layout.Rigid(material.Button(s.theme, &s.cancelClick, "取消").Layout),
			)
		}),
	)
}

func (s *Shell) resetSettings() {
	s.chromePath.SetText(`C:\Program Files\Google\Chrome\Application\chrome.exe`)
	s.edgePath.SetText(`C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe`)
	s.dataDir.SetText(`C:\Users\Public\chub\profiles`)
	s.logDir.SetText(`C:\Users\Public\chub\logs`)
}