package main

import (
	"bytes"
	"errors"
	"fmt"
	"net/http"
	"strconv"

	"gitea.local.lab/Lbenedar/snippetbox/internal/models"
)

func (app *application) render(w http.ResponseWriter, status int, page string, data *templateData) {
	ts, ok := app.templateCache[page]
	if !ok {
		err := fmt.Errorf("the template %s does not exist", page)
		app.serverError(w, err)
		return
	}
	buf := new(bytes.Buffer)

	err := ts.ExecuteTemplate(buf, "base", data)
	if err != nil {
		app.serverError(w, err)
		return
	}
	w.WriteHeader(status)
	buf.WriteTo(w)
}

func (app *application) home(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path != "/" {
		app.notFound(w)
		return
	}

	snippets, err := app.snippets.Latest()
	if err != nil {
		app.serverError(w, err)
		return
	}
	data := app.newTemplateData(r)
	data.Snippets = snippets

	app.render(w, http.StatusOK, "home.tmpl", data)
}

func (app *application) snippetView(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.URL.Query().Get("id"))
	if err != nil || id < 1 {
		app.notFound(w)
		return
	}

	snippet, err := app.snippets.Get(id)
	if err != nil {
		if errors.Is(err, models.ErrNoRecord) {
			app.notFound(w)
		} else {
			app.serverError(w, err)
		}
		return
	}
	data := app.newTemplateData(r)
	data.Snippet = snippet

	app.render(w, http.StatusOK, "view.tmpl", data)
}

func (app *application) snippetCreate(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		w.Header().Set("Allow", http.MethodPost)
		app.clientError(w, http.StatusMethodNotAllowed)
		return
	}
	title := "0 snail"
	content := "0 snail\nClimb Mount Fuji,\nBut slowly, slowly!\n\n-Kobayshi Issa"
	expires := 7

	id, err := app.snippets.Insert(title, content, expires)
	if err != nil {
		app.serverError(w, err)
		return
	}
	http.Redirect(w, r, fmt.Sprintf("/snippet/view?id=%d", id), http.StatusSeeOther)
}