package handlers

import (
	"embed"
	"html/template"
	"io/fs"
	"log"
	"net/http"
	"regexp"

	"shop/internal/models"
	"shop/internal/orderstatus"
)

//go:embed templates/*
var templateFS embed.FS

//go:embed static/*
var staticFS embed.FS

var tagRe = regexp.MustCompile(`<[^>]*>`)

func stripHTML(s string) string {
	return tagRe.ReplaceAllString(s, "")
}

func effectivePrice(p models.Product) float64 { return p.EffectivePrice() }

func ParseTemplates() (*template.Template, error) {
	funcMap := template.FuncMap{
		"plain":         stripHTML,
		"effective":     effectivePrice,
		"safeHTML":      func(s string) template.HTML { return template.HTML(s) },
		"orderLabel":    orderstatus.Label,
		"orderIcon":     orderstatus.Icon,
		"orderClass":    orderstatus.Class,
		"orderStep":     orderstatus.Step,
		"orderTimeline": func() []string { return orderstatus.Timeline },
		"stepDone": func(status, step string) bool {
			cur, s := orderstatus.Step(status), orderstatus.Step(step)
			return cur > 0 && s > 0 && s < cur
		},
		"stepCurrent": func(status, step string) bool {
			return orderstatus.Step(status) == orderstatus.Step(step)
		},
		"orderTerminal": orderstatus.IsTerminal,
		"orderNorm":     orderstatus.Normalize,
		"historyBarPct": func(price, max float64) int {
			if max <= 0 {
				return 20
			}
			pct := int(price / max * 100)
			if pct < 8 {
				return 8
			}
			return pct
		},
		"catSelected": func(catID int, productCatID *int) bool {
			return productCatID != nil && *productCatID == catID
		},
	}
	return template.New("").Funcs(funcMap).ParseFS(templateFS, "templates/*.html")
}

func StaticHandler() http.Handler {
	sub, err := fs.Sub(staticFS, "static")
	if err != nil {
		log.Fatal(err)
	}
	return http.FileServer(http.FS(sub))
}