package link

import "testing"

func TestExtractLinks(t *testing.T) {
	tests := []struct {
		name string
		body string
		want []string
	}{
		{"no links", "plain text with no links", nil},
		{"single link", "see [[nginx config]] for details", []string{"nginx config"}},
		{"multiple links", "see [[nginx config]] and [[deploy steps]]", []string{"nginx config", "deploy steps"}},
		{"duplicate deduped", "[[foo]] then [[foo]] again", []string{"foo"}},
		{"empty brackets", "empty [[ ]] ignored", nil},
		{"just brackets no content", "[[]] empty", nil},
		{"link with special chars", "see [[deploy: staging (v2)]]", []string{"deploy: staging (v2)"}},
		{"link in markdown", "# heading\n\nsee [[my note]] for info", []string{"my note"}},
		{"adjacent links", "[[one]][[two]]", []string{"one", "two"}},
		{"partial brackets ignored", "not a [link] or [[incomplete", nil},
		{"link with hash", "see [[#ops channel]]", []string{"#ops channel"}},
		{"multiline body", "line one [[link one]]\nline two [[link two]]", []string{"link one", "link two"}},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := ExtractLinks(tt.body)
			if len(got) != len(tt.want) {
				t.Fatalf("got %v, want %v", got, tt.want)
			}
			for i := range got {
				if got[i] != tt.want[i] {
					t.Fatalf("got %v, want %v", got, tt.want)
				}
			}
		})
	}
}