package yatwiki

import (
	"html/template"
	"log"
	"net/http"
	"net/url"
	"time"
)

func (this *WikiServer) noSuchArticleError(title string) template.HTML {
	return template.HTML(`No such article exists. <a href="` + this.opts.ExpectBaseURL + `modify/` + template.HTMLEscapeString(url.QueryEscape(title)) + `">Click here</a> to create it.`)
}

func (this *WikiServer) serveErrorMessage(w http.ResponseWriter, message error) {
	this.serveErrorHTMLMessage(w, template.HTML(template.HTMLEscapeString(message.Error())))
}

func (this *WikiServer) serveInternalError(w http.ResponseWriter, r *http.Request, e error) {
	log.Printf("Internal error from %s while accessing %s(%s): %s", r.RemoteAddr, r.Method, r.URL.Path, e.Error())
	http.Error(w, "An internal error occurred. Please ask an administrator to check the log file.", 500)
}

func (this *WikiServer) serveErrorHTMLMessage(w http.ResponseWriter, msg template.HTML) {
	this.serveRedirect(w, this.opts.ExpectBaseURL+"view/"+url.QueryEscape(this.opts.DefaultPage)+"?error="+url.QueryEscape(string(msg)))
}

func (this *WikiServer) serveRedirect(w http.ResponseWriter, location string) {
	w.Header().Set("Location", location)
	w.WriteHeader(302) // moved (not permanently)
}

func (this *WikiServer) servePageResponse(w http.ResponseWriter, r *http.Request, pto *pageTemplateOptions) {
	w.WriteHeader(200)
	pto.SessionMessage = template.HTML(r.URL.Query().Get("error")) // FIXME reflected XSS (although Chrome automatically blocks it..)

	err := this.pageTmp.Execute(w, pto)
	if err != nil {
		log.Println(err.Error())
	}
}

func (this *WikiServer) formatTimestamp(m int64) string {
	// TODO add a more detailed timestamp on hover
	return template.HTMLEscapeString(time.Unix(m, 0).In(this.loc).Format(this.opts.DateFormat))
}

func (this *WikiServer) viewLink(articleTitle string) template.HTML {
	return template.HTML(`&quot;<a href="` + template.HTMLEscapeString(this.opts.ExpectBaseURL+`view/`+url.QueryEscape(articleTitle)) + `">` + template.HTMLEscapeString(articleTitle) + `</a>&quot;`)
}