package pages

import (
	"delayed.link/storage"
	"embed"
	_ "embed"
	"html/template"
	"io/fs"
	"net/http"
	"net/url"
	"path/filepath"
	"strconv"
	"strings"
	"time"
)

func CreateLink(w http.ResponseWriter, r *http.Request) *storage.Link {
	err := r.ParseForm()
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return nil
	}
	form := r.PostForm

	minutesInFutureStr := form.Get("minutes_in_future")
	if strings.TrimSpace(minutesInFutureStr) == "" {
		http.Error(w, "minutes_in_future is required", http.StatusBadRequest)
		return nil
	}
	minutesInFuture, err := strconv.Atoi(minutesInFutureStr)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return nil
	}
	if minutesInFuture < 0 {
		http.Error(w, "minutes_in_future has to be > 0", http.StatusBadRequest)
	}
	numberOfOpensStr := form.Get("number_of_opens")
	if strings.TrimSpace(minutesInFutureStr) == "" {
		http.Error(w, "number_of_opens is required", http.StatusBadRequest)
		return nil
	}
	numberOfOpens, err := strconv.Atoi(numberOfOpensStr)
	if numberOfOpens < 0 || numberOfOpens > 100 {
		http.Error(w, "number_of_opens needs to be between 1 and 100", http.StatusBadRequest)
		return nil
	}
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return nil
	}
	payload := form.Get("payload")
	//TODO: Verify payload
	if _, err := url.Parse(payload); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return nil
	}

	l := storage.Link{
		Target:    payload,
		OpensFrom: time.Now().Add(time.Duration(minutesInFuture) * time.Minute),
		OpensLeft: numberOfOpens,
	}
	l.OpensStr = l.OpensFrom.Format(time.UnixDate)

	id, err := l.Save(storage.Current)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return nil
	}
	(&l).Id = id

	return &l
}

var tmpl = template.New("delayed.link")

func Create(w http.ResponseWriter, r *http.Request) {
	l := CreateLink(w, r)
	if l == nil {
		return
	}
	err := tmpl.ExecuteTemplate(w, "create", l)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

//go:embed html
var pages embed.FS

func init() {
	entries, _ := pages.ReadDir("html")
	for _, entry := range entries {
		name := entry.Name()
		if !entry.IsDir() && strings.HasSuffix(name, ".gohtml") {
			tmplName := strings.SplitN(name, ".", 2)[0]
			content, _ := fs.ReadFile(pages, filepath.Join("html", name))
			template.Must(tmpl.New(tmplName).Parse(string(content)))
		}
	}
}