package web

import (
	"fmt"
	"html/template"
	"net/http"
	"time"

	"git.noroutes.net/NoRoutes/vibetunes/internal/database"
	assets "git.noroutes.net/NoRoutes/vibetunes/web"
)

var funcMap = template.FuncMap{
	"fmtDuration": func(seconds float64) string {
		if seconds <= 0 {
			return "-"
		}
		d := time.Duration(seconds) * time.Second
		m := int(d.Minutes())
		s := int(d.Seconds()) % 60
		return fmt.Sprintf("%d:%02d", m, s)
	},
	"fmtTime": func(t time.Time) string {
		if t.IsZero() {
			return "-"
		}
		return t.Format("2006-01-02 15:04")
	},
	"add": func(a, b int) int { return a + b },
	"sub": func(a, b int) int { return a - b },
}

var templates *template.Template

func init() {
	t, err := template.New("").Funcs(funcMap).ParseFS(assets.FS, "templates/*.html", "templates/partials/*.html")
	if err != nil {
		panic(err)
	}
	templates = t
}

// PageData is the common envelope passed to every page template.
type PageData struct {
	Active    string // nav item key for sidebar highlighting
	Title     string
	User      *database.User
	CSRFToken string
	Flash     string
	FlashKind string // success|danger|warning
	Data      any
}

func render(w http.ResponseWriter, name string, data PageData) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := templates.ExecuteTemplate(w, name, data); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}