package todos

import (
	"context"
	"fmt"
	"strconv"
	"strings"

	. "ersteller-lib"
	"git.gorlug.de/code/golang/ersteller-lib/starter/ent"
	"git.gorlug.de/code/golang/ersteller-lib/starter/ent/todo"

	. "maragu.dev/gomponents"
	. "maragu.dev/gomponents/html"
)

const TodosPath = "/todos"
const TodosPathDe = "/todos"

// i18n texts
var texts *Texts

type Texts struct {
	PageTitle       I18nText
	PageDescription I18nText
	HeroTitle       I18nText
	AddPlaceholder  I18nText
	AddButton       I18nText
	DeleteButton    I18nText
	SaveButton      I18nText
}

type Page struct {
	createPage CreateHtmxPageFunc
	db         *ent.Client

	ViewRoute   HtmxRoute
	AddRoute    HtmxRoute
	UpdateRoute HtmxRoute
	DeleteRoute HtmxRoute
}

func NewPage(createPage CreateHtmxPageFunc, server HtmxServer, path *ActivePath, db *ent.Client) *Page {
	if texts == nil {
		createTexts()
	}
	p := &Page{createPage: createPage, db: db}
	p.ViewRoute = NewHtmxGetRoute(p.View, LanguagePaths{En: TodosPath, De: TodosPathDe}).SetActivePath(path)
	p.ViewRoute.Add(server)

	p.AddRoute = NewHtmxPostRoute(p.Add, LanguagePaths{En: TodosPath + "/add", De: TodosPathDe + "/add"})
	p.AddRoute.Add(server)
	p.UpdateRoute = NewHtmxPostRoute(p.Update, LanguagePaths{En: TodosPath + "/update", De: TodosPathDe + "/update"})
	p.UpdateRoute.Add(server)
	p.DeleteRoute = NewHtmxPostRoute(p.Delete, LanguagePaths{En: TodosPath + "/delete", De: TodosPathDe + "/delete"})
	p.DeleteRoute.Add(server)
	return p
}

func createTexts() {
	texts = &Texts{
		PageTitle:       NewI18nText(map[Language]string{En: "Todos", De: "Todos"}),
		PageDescription: NewI18nText(map[Language]string{En: "Manage your todos", De: "Verwalte deine Todos"}),
		HeroTitle:       NewI18nText(map[Language]string{En: "Todos", De: "Todos"}),
		AddPlaceholder:  NewI18nText(map[Language]string{En: "New todo title", De: "Neuer Todo-Titel"}),
		AddButton:       NewI18nText(map[Language]string{En: "Add", De: "Hinzufügen"}),
		DeleteButton:    NewI18nText(map[Language]string{En: "Delete", De: "Löschen"}),
		SaveButton:      NewI18nText(map[Language]string{En: "Save", De: "Speichern"}),
	}
}

func (p *Page) getMetaData() PageWebsiteMetaData {
	return PageWebsiteMetaData{
		Title:       texts.PageTitle,
		Lang:        En,
		Description: texts.PageDescription,
	}
}

func (p *Page) View(c HtmxContext) {
	language := c.GetLanguage()
	todos, _ := p.db.Todo.Query().Order(ent.Asc(todo.FieldCreatedAt)).All(context.Background())
	content := Group{
		Div(Class("hero-section"),
			H1(Class("hero-title"), Text(texts.HeroTitle.FromLang(language))),
		),
		Div(Class("content-section"),
			p.addForm(c),
			Div(ID("todos-list"), p.todosList(c, todos)),
		),
	}
	p.createPage(c, p.getMetaData(), content)
}

func (p *Page) addForm(c HtmxContext) Node {
	lang := c.GetLanguage()
	return Form(Action(p.AddRoute.ToUrlFromContext(c, lang)), Method("post"),
		Div(Class("form-row"),
			Input(Type("text"), Name("title"), Placeholder(texts.AddPlaceholder.FromLang(lang))),
			Button(Type("submit"), Text(texts.AddButton.FromLang(lang))),
		),
	)
}

func (p *Page) todosList(c HtmxContext, list []*ent.Todo) Node {
	lang := c.GetLanguage()
	items := make([]Node, 0, len(list))
	for _, t := range list {
		items = append(items, p.todoItem(c, lang, t))
	}
	return Ul(Class("todo-list"), Group(items))
}

func (p *Page) todoItem(c HtmxContext, lang Language, t *ent.Todo) Node {
	// Simple inline edit form per item
	return Li(ID(p.itemDomID(t.ID)),
		Form(Action(p.UpdateRoute.ToUrlFromContext(c, lang)), Method("post"),
			Input(Type("hidden"), Name("id"), Value(fmt.Sprintf("%d", t.ID))),
			Input(Type("checkbox"), Name("completed"), If(t.Completed, Attr("checked", "checked"))),
			Input(Type("text"), Name("title"), Value(t.Title)),
			Button(Type("submit"), Text(texts.SaveButton.FromLang(lang))),
		),
		Form(Action(p.DeleteRoute.ToUrlFromContext(c, lang)), Method("post"),
			Input(Type("hidden"), Name("id"), Value(fmt.Sprintf("%d", t.ID))),
			Button(Type("submit"), Class("danger"), Text(texts.DeleteButton.FromLang(lang))),
		),
	)
}

func (p *Page) itemDomID(id int) string { return fmt.Sprintf("todo-%d", id) }

// Handlers
func (p *Page) Add(c HtmxContext) {
	title := strings.TrimSpace(c.GetFormValue("title"))
	if title == "" {
		p.renderList(c)
		return
	}
	_, _ = p.db.Todo.Create().SetTitle(title).Save(context.Background())
	p.renderList(c)
}

func (p *Page) Update(c HtmxContext) {
	idStr := c.GetFormValue("id")
	id, _ := strconv.Atoi(idStr)
	if id == 0 {
		p.renderList(c)
		return
	}
	title := strings.TrimSpace(c.GetFormValue("title"))
	completed := c.GetFormValue("completed") == "on"
	_ = p.db.Todo.UpdateOneID(id).SetTitle(title).SetCompleted(completed).Exec(context.Background())
	p.renderList(c)
}

func (p *Page) Delete(c HtmxContext) {
	idStr := c.GetFormValue("id")
	id, _ := strconv.Atoi(idStr)
	if id != 0 {
		_ = p.db.Todo.DeleteOneID(id).Exec(context.Background())
	}
	p.renderList(c)
}

func (p *Page) renderList(c HtmxContext) {
	todos, _ := p.db.Todo.Query().Order(ent.Asc(todo.FieldCreatedAt)).All(context.Background())
	c.Render(Div(ID("todos-list"), p.todosList(c, todos)))
}