package web

import (
	"embed"
	"html/template"
	"io/fs"
	"net/http"
	"strings"
)

//go:embed templates/* static/*
var content embed.FS

var pageTemplate = template.Must(template.New("view.html").Funcs(template.FuncMap{
	"statusClass": statusClass,
	"joinLines":   joinLines,
}).ParseFS(content, "templates/view.html"))

func Render(data any) ([]byte, error) {
	var out strings.Builder
	if err := pageTemplate.ExecuteTemplate(&out, "view.html", data); err != nil {
		return nil, err
	}
	return []byte(out.String()), nil
}

func Static() http.Handler {
	sub, err := fs.Sub(content, "static")
	if err != nil {
		panic(err)
	}
	return http.FileServer(http.FS(sub))
}

func statusClass(value string) string {
	switch strings.ToUpper(strings.TrimSpace(value)) {
	case "OK":
		return "status-ok"
	case "WARNING":
		return "status-warning"
	case "CRITICAL":
		return "status-critical"
	case "UNKNOWN":
		return "status-unknown"
	case "EMPTY":
		return "status-empty"
	default:
		return ""
	}
}

func joinLines(value string) []string {
	if strings.TrimSpace(value) == "" {
		return nil
	}
	return strings.Split(value, "\n")
}