package classes

import (
	"strings"

	"git.golem15.com/golem15/sm-sitemap-plugin/models"
	"git.golem15.com/golem15/summercms/modules/pact"
)

// MaxImagesPerURL is the most images one <url> of an image sitemap lists
// (Google's limit).
const MaxImagesPerURL = 1000

// ImagesGroup is the file group of the image sitemaps:
// sitemap-images-<n>.xml. No content type may use it (ReservedSlugs).
const ImagesGroup = "images"

// PageImages lists the images of one locale of a record for the image
// sitemap (D-31): the featured Image first, then Images in document order,
// each a path on the site or an absolute http(s) URL (a protocol-relative
// //host/... address is read as https). Another value (a data: or
// javascript: URL, a relative path) is skipped, and an address is listed
// once, compared as absolute on site. At most MaxImagesPerURL are kept.
func PageImages(l pact.ContentLocale, site string) []string {
	out := []string{}
	seen := map[string]bool{}
	add := func(u string) {
		u = strings.TrimSpace(u)
		if strings.HasPrefix(u, "//") {
			u = "https:" + u
		}
		if u == "" || !models.AllowedAddress(u) {
			return
		}
		key := u
		if abs := Absolute(site, u); abs != "" {
			key = abs
		}
		if seen[key] || len(out) >= MaxImagesPerURL {
			return
		}
		seen[key] = true
		out = append(out, u)
	}
	add(l.Image)
	for _, img := range l.Images {
		add(img.URL)
	}
	return out
}