//go:build windows

package main

import (
	"fmt"
	"strconv"
	"strings"

	"github.com/lxn/walk"
	. "github.com/lxn/walk/declarative"
)

var styleOptions = []struct {
	Label string
	Value string
}{
	{"保持 Windows 当前设置", "keep"},
	{"填充", "fill"},
	{"适应", "fit"},
	{"拉伸", "stretch"},
	{"平铺", "tile"},
	{"居中", "center"},
	{"跨区", "span"},
}

func (a *App) showSettings() {
	if a.settingsDialog != nil {
		a.settingsDialog.Show()
		_ = a.settingsDialog.Activate()
		return
	}

	var dlg *walk.Dialog
	var apiEdit, intervalEdit, cacheEdit *walk.LineEdit
	var autoCheck, startupCheck *walk.CheckBox
	var styleCombo *walk.ComboBox

	labels := make([]string, len(styleOptions))
	styleIndex := 0
	for i, option := range styleOptions {
		labels[i] = option.Label
		if option.Value == a.config.WallpaperStyle {
			styleIndex = i
		}
	}

	err := Dialog{
		AssignTo: &dlg,
		Title:    "GoWallpaper 设置",
		MinSize:  Size{520, 300},
		Layout:   VBox{MarginsZero: false},
		Children: []Widget{
			Label{Text: "随机图片 API 地址（HTTP GET 直接返回图片）"},
			LineEdit{AssignTo: &apiEdit, Text: a.config.APIURL},
			Composite{
				Layout: Grid{Columns: 2},
				Children: []Widget{
					CheckBox{AssignTo: &autoCheck, Text: "启用自动切换", Checked: a.config.AutoChangeEnabled},
					CheckBox{AssignTo: &startupCheck, Text: "开机自动启动", Checked: a.config.StartWithWindows},
					Label{Text: "自动切换间隔（分钟）"},
					LineEdit{AssignTo: &intervalEdit, Text: strconv.Itoa(a.config.IntervalMinutes)},
					Label{Text: "最多保留缓存图片数"},
					LineEdit{AssignTo: &cacheEdit, Text: strconv.Itoa(a.config.MaxCacheCount)},
					Label{Text: "壁纸显示方式"},
					ComboBox{AssignTo: &styleCombo, Model: labels, CurrentIndex: styleIndex},
				},
			},
			VSpacer{},
			Composite{
				Layout: HBox{},
				Children: []Widget{
					HSpacer{},
					PushButton{Text: "保存", OnClicked: func() {
						interval, parseErr := parsePositiveInt(intervalEdit.Text(), "自动切换间隔")
						if parseErr != nil {
							walk.MsgBox(dlg, "设置无效", parseErr.Error(), walk.MsgBoxIconWarning)
							return
						}
						maxCache, parseErr := parsePositiveInt(cacheEdit.Text(), "缓存数量")
						if parseErr != nil {
							walk.MsgBox(dlg, "设置无效", parseErr.Error(), walk.MsgBoxIconWarning)
							return
						}
						index := styleCombo.CurrentIndex()
						if index < 0 || index >= len(styleOptions) {
							index = 0
						}
						cfg := Config{
							APIURL:            strings.TrimSpace(apiEdit.Text()),
							AutoChangeEnabled: autoCheck.Checked(),
							IntervalMinutes:   interval,
							MaxCacheCount:     maxCache,
							WallpaperStyle:    styleOptions[index].Value,
							StartWithWindows:  startupCheck.Checked(),
						}
						if err := a.applyConfig(cfg); err != nil {
							walk.MsgBox(dlg, "保存失败", err.Error(), walk.MsgBoxIconError)
							return
						}
						dlg.Accept()
						if cfg.APIURL == "" {
							a.notifyInfo("配置已保存。刷新壁纸前需要先设置随机图片 API 地址。")
						} else {
							a.notifyInfo("配置已保存。")
						}
					}},
					PushButton{Text: "取消", OnClicked: func() { dlg.Cancel() }},
				},
			},
		},
	}.Create(nil)
	if err != nil {
		a.notifyError("无法打开设置窗口：" + err.Error())
		return
	}
	a.settingsDialog = dlg
	dlg.Closing().Attach(func(_ *bool, _ walk.CloseReason) {
		if a.settingsDialog == dlg {
			a.settingsDialog = nil
		}
	})
	dlg.Show()
	_ = dlg.Activate()
}

func parsePositiveInt(value, field string) (int, error) {
	n, err := strconv.Atoi(strings.TrimSpace(value))
	if err != nil || n <= 0 {
		return 0, fmt.Errorf("%s必须是大于 0 的整数", field)
	}
	return n, nil
}