package main

import (
	"bytes"
	"errors"
	"html"
	"io"
	"io/fs"
	"log"
	"net/http"
	"os"
	"path/filepath"

	"riedstra.dev/mitch/go-website/page"
)

func (a *App) EditPage(w http.ResponseWriter, r *http.Request) {
	if r.Method != "GET" {
		page.Render(w, r, page.TemplateDirectory+"/4xx", map[string]interface{}{
			"Title":       "Method Not allowed",
			"Description": "Method not allowed",
			"LoggedIn":    a.IsLoggedIn(r),
		}, http.StatusMethodNotAllowed)

		return
	}

	p := r.URL.Path

	p = filepath.Clean(p)

	fh, err := os.Open("./" + p + page.Suffix)
	if err != nil && errors.Is(err, fs.ErrNotExist) {
		fh, err = os.Open("./" + page.TemplateDirectory +
			"/new-template" + page.Suffix)
	}

	if err != nil {
		log.Printf("opening page: %s", err)
		a.Err500Default(w, r)

		return
	}
	defer fh.Close()

	b, err := io.ReadAll(fh)
	if err != nil {
		log.Printf("opening page: %s", err)
		a.Err500Default(w, r)

		return
	}

	page.Render(w, r, page.TemplateDirectory+"/edit", map[string]interface{}{
		"Page":     p,
		"Content":  html.EscapeString(string(b)),
		"LoggedIn": a.IsLoggedIn(r),
	}, http.StatusOK)
}

func (a *App) SaveEditPage(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		a.Err500Default(w, r)

		return
	}

	p := r.URL.Path
	content := r.FormValue("content")

	content = html.UnescapeString(content)
	p = filepath.Clean(p)

	fn := "./" + p + page.Suffix

	fh, err := os.OpenFile(fn, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		log.Printf("opening file %s for writing: %s", fn, err)
		a.Err500Default(w, r)

		return
	}
	defer fh.Close()

	c := bytes.ReplaceAll([]byte(content), []byte{'\r'}, []byte{})

	_, err = fh.Write(c)
	if err != nil {
		log.Printf("opening file %s for writing: %s", fn, err)
		a.Err500Default(w, r)

		return
	}

	http.Redirect(w, r, "/"+r.URL.Path, http.StatusFound)

	err = a.ClearRedis() // Clear out the cache if any
	if err != nil {
		log.Printf("after editing %s: %s", fn, err)
	}
}