package handler

import (
	"bytes"
	"encoding/json"
	"log/slog"
	"net/http"
	"os"

	"github.com/alecthomas/chroma/v2/formatters/html"
	"github.com/alecthomas/chroma/v2/lexers"
	"github.com/alecthomas/chroma/v2/styles"

	"git.gabrielgio.me/cerrado/pkg/config"
	"git.gabrielgio.me/cerrado/templates"
)

func ConfigFile(configPath string) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, _ *http.Request) {
		f, err := os.Open(configPath)
		if err != nil {
			slog.Error("Error openning config file", "error", err, "path", configPath)
			return
		}

		c, err := config.Parse(f)
		if err != nil {
			slog.Error("Error parsing config", "error", err, "path", configPath)
			return
		}

		b, err := json.MarshalIndent(c, "", "	")
		if err != nil {
			slog.Error("Error parsing json", "error", err)
			return
		}

		lexer := lexers.Get("json")
		style := styles.Get("monokailight")
		formatter := html.New(
			html.WithLineNumbers(true),
		)
		iterator, err := lexer.Tokenise(nil, string(b))
		if err != nil {
			slog.Error("Error tokenise", "error", err)
			return
		}

		var code bytes.Buffer
		err = formatter.Format(&code, style, iterator)
		if err != nil {
			slog.Error("Error format", "error", err)
			return
		}

		hello := &templates.HelloPage{
			Body: code.String(),
		}

		templates.WritePageTemplate(w, hello)
	}
}