package main

import (
	"html/template"
	"io/fs"
	"log/slog"
	"net/http"
	"os"
	"path/filepath"

	"github.com/maximotejeda/us_dop_api/adapters/dolar"
	"github.com/maximotejeda/us_dop_api/handlers"
	"github.com/maximotejeda/us_dop_api/middlewares"
	"github.com/maximotejeda/us_dop_api/static"
	"github.com/maximotejeda/us_dop_bot/config"
	"github.com/maximotejeda/us_dop_db/db"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

var (
	hostSTR = os.Getenv("HOST)")
	portSTR = os.Getenv("PORT")
	templ   template.Template
)

func main() {

	// Log creation
	log := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{}))

	var opts []grpc.DialOption
	opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
	dolarConn, err := grpc.Dial(config.GetDollarServiceURL(), opts...)
	if err != nil {
		log.Error("creating gerpc conn", "error", err)
		panic(err)
	}
	dol, err := dolar.NewAdapter(dolarConn)
	if err != nil {
		log.Error("creating service adapter", "error", err)
		panic(err)
	}

	// templates
	tmplDirStr := "assets/templates/"
	ftmpl := os.DirFS(tmplDirStr)
	toParseFiles := []string{}

	// wlaks the Fs looking for templates
	err = fs.WalkDir(ftmpl, ".", func(p string, d fs.DirEntry, err error) error {
		log.Info("parsing", "file", p)
		if filepath.Ext(p) == ".tmpl" {
			toParseFiles = append(toParseFiles, tmplDirStr+p)
		}
		return nil
	})
	if err != nil {
		panic(err)
	}

	// init database
	dbe := db.Dial("dolardb/crawler.db", log)

	// handler containing all the necessary files
	root := handlers.NewRoot(dbe, dol, log, toParseFiles)

	s := middlewares.NewLogger(http.HandlerFunc(static.ServeFiles), log)
	r := middlewares.NewLogger(root, log)

	mux := http.NewServeMux()
	server := http.Server{
		Addr:    hostSTR + ":" + portSTR,
		Handler: mux,
	}
	mux.Handle("/", r)

	mux.Handle("GET /static/", s)
	if err := server.ListenAndServe(); err != nil {
		log.Error("while serving", "error", err)
	}

}