package aiprompts

import (
	"regexp"
	"testing"

	"github.com/descrybe/descrybe-v2/apps/api/internal/company"
)

var languageFmt = regexp.MustCompile(`^[a-z]{2}$`)

func TestProductEnhanceUpsertLanguages_neverStar(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name         string
		contentLangs []string
		primary      string
		want         []string
	}{
		{
			name:         "primary_only",
			contentLangs: nil,
			primary:      "sl",
			want:         []string{"sl"},
		},
		{
			name:         "primary_plus_content",
			contentLangs: []string{"sl", "en", "de"},
			primary:      "sl",
			want:         []string{"sl", "en", "de"},
		},
		{
			name:         "drops_star_and_invalid",
			contentLangs: []string{"*", "sl", "xx", "", "EN"},
			primary:      "*",
			want:         []string{"en", "sl"},
		},
		{
			name:         "dedupes_primary_in_content",
			contentLangs: []string{"sl", "sl", "en"},
			primary:      "sl",
			want:         []string{"sl", "en"},
		},
		{
			name:         "empty_falls_back_default",
			contentLangs: []string{"*", ""},
			primary:      "",
			want:         []string{company.DefaultLanguage},
		},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			got := productEnhanceUpsertLanguages(tc.contentLangs, tc.primary)
			if len(got) != len(tc.want) {
				t.Fatalf("len=%d want %d (%v)", len(got), len(tc.want), got)
			}
			for i := range got {
				if got[i] != tc.want[i] {
					t.Fatalf("got %v want %v", got, tc.want)
				}
				if !languageFmt.MatchString(got[i]) {
					t.Fatalf("language %q fails ai_prompt_templates_language_fmt", got[i])
				}
				if got[i] == company.LangPromptAny {
					t.Fatalf("must not upsert LangPromptAny")
				}
			}
		})
	}
}