package browser

import "strings"

// HandleSearch filters entries by the given query string.
// It performs case-insensitive substring matching across all loaded pages.
// When query is empty, search results are cleared.
// When results are found, ScrollOffset is set to jump to the first match.
func HandleSearch(s *BrowserState, query string) {
	s.Query = query

	// Empty query clears search results; leave ScrollOffset unchanged.
	if query == "" {
		s.SearchResults = nil
		s.ScrollOffset = 0 // Reset scroll offset when search is cleared
		return
	}

	var results []int
	queryLower := strings.ToLower(query)

	// Iterate over all loaded pages in order (map iteration is non-deterministic).
	totalPages := (s.TotalEntries + PageSize - 1) / PageSize
	for pageIdx := 0; pageIdx < totalPages; pageIdx++ {
		page, ok := s.Pages[pageIdx]
		if !ok || !page.Loaded {
			continue
		}
		// Compute the global start index for this page.
		startIdx := pageIdx * PageSize
		for i, entry := range page.Entries {
			globalIdx := startIdx + i
			if strings.Contains(strings.ToLower(entry.Name), queryLower) {
				results = append(results, globalIdx)
			}
		}
	}

	s.SearchResults = results

	// Jump to first result if any matches found.
	if len(results) > 0 {
		s.ScrollOffset = float64(results[0]) * s.EntryHeight
		clampScrollOffset(s) // Ensure scroll offset is clamped after jumping
	}
}