package blog 

import (
	"os"
	"io"
	"fmt"
	"net/http"

	"github.com/gorilla/mux"
)

type FileReader struct{}

type SlugReader interface {
  Read(slug string) (string, error)
}

func (fsr FileReader) Read(slug string) (string, error) {
	f, err := os.Open(slug + ".md")
	if err != nil {
		return "", err
	}
	defer f.Close()
	b, err := io.ReadAll(f)
	if err != nil {
		return "", err
	}
	return string(b), nil
}

func PostHandler(sl SlugReader) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        vars := mux.Vars(r) // Correctly retrieve vars from the request
        slug := vars["slug"] // Access the slug
        postMarkdown, err := sl.Read(slug)
        if err != nil {
            http.Error(w, "Post not found", http.StatusNotFound)
            return
        }
        fmt.Fprint(w, postMarkdown)
    }
}