package kconfig

import (
	_ "embed"
	"html/template"
	"io/ioutil"
	"net/http"
	"strings"

	"github.com/rs/zerolog/log"
	"kumoly.io/lib/guard/engine"
	"kumoly.io/tools/kconfig/public"
)

//go:embed assets/default.jcs
var defaultSchema []byte

//go:embed public/index.html
var index string
var servePublic = http.FileServer(http.FS(public.FS))

var tmpl *engine.Engine
var l = log.With().Str("mod", "kconfig").Logger()

func init() {
	tmpl = engine.Must(engine.New("").Parse(index))
}

type Kconfig struct {
	// AppName displays appname in title and the download file will be {{.AppName}}.json
	AppName string
	// Schema json for schema, more information see [json-editor](https://github.com/json-editor/json-editor)
	Schema []byte
	// Mux the underlying Mux
	Mux *http.ServeMux

	// Apply function callback for intergrating submit
	Apply func([]byte) error
	// Load function callback for intergrating load
	Load func() []byte
}

func New() *Kconfig {
	k := &Kconfig{
		AppName: "kconfig",
		Schema:  defaultSchema,
		Apply: func(b []byte) error {
			l.Debug().Msgf("%s", b)
			return nil
		},
		Load: func() []byte {
			return []byte(`{
				"name": "test",
				"age": 21,
				"gender": "male",
				"location": {
					"city": "",
					"state": "",
					"citystate": ", "
				},
				"pets": [],
				"cars": []
			}`)
		},
	}
	mux := http.NewServeMux()
	mux.HandleFunc("/", k.App)
	mux.HandleFunc("/api/schema", func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet {
			http.NotFound(w, r)
			return
		}
		w.Write([]byte(k.Schema))
	})
	mux.HandleFunc("/api/load", func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet {
			http.NotFound(w, r)
			return
		}
		w.Write([]byte(k.Load()))
	})

	mux.HandleFunc("/api/apply", func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			http.NotFound(w, r)
			return
		}
		data, err := ioutil.ReadAll(r.Body)
		r.Body.Close()
		if err != nil {
			panic(err)
		}
		err = k.Apply(data)
		if err != nil {
			panic(err)
		}
		w.Write([]byte("ok"))
	})
	k.Mux = mux
	return k
}

func (k *Kconfig) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	k.Mux.ServeHTTP(w, r)
}

func (k *Kconfig) App(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path == "/" {
		tmpl.Execute(w, struct {
			AppName string
			ACE_JS  template.HTML
		}{
			k.AppName,
			template.HTML(`<script src="ace/ace.js"></script>`),
		})
		return
	}
	file, err := public.FS.Open(strings.TrimPrefix(r.URL.String(), "/"))
	if err != nil {
		http.NotFound(w, r)
		return
	}
	stat, err := file.Stat()
	if err != nil || stat.IsDir() {
		http.NotFound(w, r)
		return
	}
	servePublic.ServeHTTP(w, r)
}