package yatwiki

import (
	"errors"
	"fmt"
	"html/template"
	"math"
	"net/http"
	"net/url"
)

func (this *WikiServer) routeRecentChanges(w http.ResponseWriter, r *http.Request, pageNum int) {

	totalEdits, err := this.db.TotalRevisions()
	if err != nil {
		this.serveInternalError(w, r, err)
		return
	}

	minPage := 1
	maxPage := int(math.Ceil(float64(totalEdits) / float64(this.opts.RecentChanges)))

	if pageNum < minPage || pageNum > maxPage {
		this.serveErrorMessage(w, errors.New("Invalid page."))
		return
	}

	recents, err := this.db.GetRecentChanges((pageNum-1)*this.opts.RecentChanges, this.opts.RecentChanges)
	if err != nil {
		this.serveErrorMessage(w, err)
		return
	}

	//

	pto := DefaultPageTemplateOptions(this.opts)
	pto.CurrentPageName = "Recent Changes"

	content := `<h2>Recent Changes</h2><br>` +
		`<em>Showing up to ` + fmt.Sprintf("%d", this.opts.RecentChanges) + ` changes.</em><br>` +
		`<table>`
	for _, rev := range recents {
		content += `<tr>` +
			`<td><a href="` + template.HTMLEscapeString(this.opts.ExpectBaseURL+`view/`+url.PathEscape(rev.Title)) + `">` + template.HTMLEscapeString(rev.Title) + `</a>` +
			` [<a href="` + template.HTMLEscapeString(this.opts.ExpectBaseURL+`archive/`+fmt.Sprintf("%d", rev.ID)) + `">a</a>]` +
			`</td>` +
			`<td>` + this.formatTimestamp(rev.Modified) + ` by ` + template.HTMLEscapeString(rev.Author) + `</td>` +
			`</tr>`
	}
	content += `<tr><td>`
	if pageNum > 1 {
		content += `<a href="` + template.HTMLEscapeString(this.opts.ExpectBaseURL+`recent/`+fmt.Sprintf("%d", pageNum-1)) + `">&laquo; Newer</a>`
	}
	content += `</td><td></td><td style="text-align:right;">`
	if pageNum < maxPage {
		content += `<a href="` + template.HTMLEscapeString(this.opts.ExpectBaseURL+`recent/`+fmt.Sprintf("%d", pageNum+1)) + `">Older &raquo;</a>`
	}
	content += `</td></tr></table>`

	pto.Content = template.HTML(content)
	this.servePageResponse(w, r, pto)
	return
}