package views

import (
	"fmt"
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/data/binding"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/widget"
	"regexp"
	"strings"
	"work_cation/models"
	"work_cation/pkg/utils"
	"work_cation/service"
)

var erlangCard *models.ErlangCards

func CreateErlangCard(w fyne.Window) fyne.CanvasObject {
	if erlangCard == nil {
		erlangCard = &models.ErlangCards{
			UUID:   utils.CreateUUID(),
			UserIp: utils.Get192Ip(),
		}
	}
	var (
		// 基础表单
		formBase = &widget.Form{}
		// 变量表单
		formVars = &widget.Form{}
	)

	formBase.AppendItem(&widget.FormItem{Text: "名称", Widget: newDefaultEntry(&erlangCard.Title)})
	formBase.AppendItem(&widget.FormItem{Text: "描述", Widget: newDefaultEntry(&erlangCard.Text)})
	formBase.AppendItem(&widget.FormItem{Text: "封面", Widget: newDefaultEntry(&erlangCard.Covers), HintText: "暂未支持可不填"})
	formBase.AppendItem(&widget.FormItem{Text: "是否默认展示", Widget: newDefaultEntry(&erlangCard.IsShowOut)})
	formBase.AppendItem(&widget.FormItem{Text: "模版内容", Widget: newDefaultEntryCallback(&erlangCard.Template, func() { generateVariableForm1(erlangCard, formVars) })})

	// 刷新变量表单
	generateVariableForm1(erlangCard, formVars)

	// 保存按钮
	buttonSave := widget.NewButton("保存", func() {
		err := service.ErlangCard.Create(erlangCard)
		if err != nil {
			dialog.ShowError(err, w)
			return
		}
		dialog.ShowInformation("ok", "创建成功", w)
		// 更换
		erlangCard.UUID = utils.CreateUUID()
	})

	return container.NewBorder(container.NewHBox(widget.NewLabel("新建"), widget.NewSeparator()),
		nil, nil, nil, container.NewScroll(
			container.NewVBox(
				formBase,
				formVars,
				buttonSave,
			)))
}

// 刷新表单
func generateVariableForm1(erlCard *models.ErlangCards, form2 *widget.Form) {
	varSum := countVarOccurrences(erlCard.Template)
	form2.Items = nil
	var newVarList []string
	for i := 0; i < varSum; i++ {
		var item string
		if i < len(erlCard.VarName) { // 如果有旧数据，则使用旧数据
			item = erlCard.VarName[i]
		}
		var index = i
		newItem := &widget.FormItem{Text: fmt.Sprintf("变量%d", i+1), Widget: newDefaultEntryCallback(&item, func() {
			erlCard.VarName[index] = item
		})}
		form2.AppendItem(newItem)
		newVarList = append(newVarList, item)
	}
	erlCard.VarName = newVarList
	form2.Refresh()
}

func countVarOccurrences(input string) int {
	re := regexp.MustCompile(`\$var`)
	matches := re.FindAllStringIndex(input, -1)
	return len(matches)
}

func newDefaultEntry(value any) *widget.Entry {
	en := widget.NewEntry()
	switch v := value.(type) {
	case string:
		en.SetText(v)
	case bool:
		if v {
			en.SetText("1")
		} else {
			en.SetText("0")
		}
	case []string:
		en.SetText(strings.Join(v, ","))

	case *string:
		data := binding.BindString(v)
		en.Bind(data)
	case *bool:
		data := binding.NewString()
		data.AddListener(binding.NewDataListener(func() {
			s, err := data.Get()
			if err != nil {
				return
			}
			*v = s == "1"
		}))
		if *v {
			data.Set("1")
		} else {
			data.Set("0")
		}
		en.Bind(data)
	case *[]string:
		data := binding.NewString()
		data.Set(strings.Join(*v, ","))
		en.Bind(data)
	default:
	}
	return en
}

func newDefaultEntryCallback(value *string, callback func()) *widget.Entry {
	en := widget.NewEntry()
	data := binding.BindString(value)
	en.Bind(data)
	en.OnChanged = func(_ string) { callback() }
	return en
}