package frontend

import (
	"html/template"
	"net/http"
	"os"

	"git.sleepycat.moe/sam/mercury/frontend"
	"git.sleepycat.moe/sam/mercury/internal/database"
	"git.sleepycat.moe/sam/mercury/web/app"
	"github.com/rs/zerolog/log"
	vueglue "github.com/torenware/vite-go"

	_ "embed"
)

//go:embed app.html
var htmlTemplate string

type Frontend struct {
	*app.App
	glue       *vueglue.VueGlue
	urlPrefix  string
	fileServer http.Handler
	tmpl       *template.Template
}

func New(app *app.App) *Frontend {
	fe := &Frontend{
		App: app,
	}

	if app.Config.Core.Dev {
		glue, err := vueglue.NewVueGlue(&vueglue.ViteConfig{
			Environment: "development",
			AssetsPath:  "frontend",
			EntryPoint:  "src/main.ts",
			Platform:    "svelte",
			FS:          os.DirFS("frontend"),
		})
		if err != nil {
			log.Err(err).Msg("Creating vite glue")
			os.Exit(1)
		}
		fe.glue = glue
		fe.urlPrefix = "/src/*"
	} else {
		glue, err := vueglue.NewVueGlue(&vueglue.ViteConfig{
			Environment: "production",
			URLPrefix:   "/assets/",
			AssetsPath:  "dist",
			EntryPoint:  "src/main.ts",
			Platform:    "svelte",
			FS:          frontend.Embed,
		})
		if err != nil {
			log.Err(err).Msg("Creating vite glue")
			os.Exit(1)
		}
		fe.glue = glue
		fe.urlPrefix = "/assets/*"
	}

	fileServer, err := fe.glue.FileServer()
	if err != nil {
		log.Err(err).Msg("Creating vite file server")
		os.Exit(1)
	}
	fe.fileServer = fileServer

	tmpl, err := template.New("app").Parse(htmlTemplate)
	if err != nil {
		log.Err(err).Msg("Parsing frontend HTML template")
		os.Exit(1)
	}
	fe.tmpl = tmpl

	return fe
}

func (app *Frontend) AssetsPath() string { return app.urlPrefix }

func (app *Frontend) ServeAssets(w http.ResponseWriter, r *http.Request) {
	app.fileServer.ServeHTTP(w, r)
}

func (app *Frontend) ServeFrontend(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/html")
	err := app.tmpl.Execute(w, map[string]any{
		"Config": database.DefaultConfig,
		"Vue":    app.glue,
	})
	if err != nil {
		log.Err(err).Msg("executing frontend template")
	}
}