package radarfetch

import (
	"bytes"
)

// ExtractFirstImageAndTime tries to extract data-img and data-time from NMC HTML.
// It first searches for an element with class "time" that carries data-img/time;
// falls back to the first occurrence of data-img / data-time attributes in the HTML.
func ExtractFirstImageAndTime(html []byte) (img string, timeStr string, ok bool) {
	// naive scan for data-img and data-time on the same segment first
	// Search for class="time" anchor to bias to the right element
	idx := bytes.Index(html, []byte("class=\"time\""))
	start := 0
	if idx >= 0 {
		// back up a bit to include attributes on same tag
		if idx > 200 {
			start = idx - 200
		} else {
			start = 0
		}
	}
	seg := html[start:]
	img = findAttr(seg, "data-img")
	timeStr = findAttr(seg, "data-time")
	if img != "" {
		return img, timeStr, true
	}
	// fallback: first data-img anywhere
	img = findAttr(html, "data-img")
	timeStr = findAttr(html, "data-time")
	if img != "" {
		return img, timeStr, true
	}
	return "", "", false
}

func findAttr(b []byte, key string) string {
	// look for key="..."
	pat := []byte(key + "=\"")
	i := bytes.Index(b, pat)
	if i < 0 {
		return ""
	}
	i += len(pat)
	j := bytes.IndexByte(b[i:], '"')
	if j < 0 {
		return ""
	}
	return string(b[i : i+j])
}