package auth

import (
	"strings"
	"testing"
)

func TestGenerateToken(t *testing.T) {
	const n = 1000
	tokens := make([]string, 0, n)
	for i := 0; i < n; i++ {
		tok, err := GenerateToken()
		if err != nil {
			t.Fatalf("GenerateToken() returned error: %v", err)
		}
		tokens = append(tokens, tok)
	}

	t.Run("all tokens are non-empty", func(t *testing.T) {
		for i, tok := range tokens {
			if tok == "" {
				t.Fatalf("token at index %d is empty", i)
			}
		}
	})

	t.Run("all tokens are distinct", func(t *testing.T) {
		seen := make(map[string]struct{}, len(tokens))
		for i, tok := range tokens {
			if _, ok := seen[tok]; ok {
				t.Fatalf("duplicate token found at index %d: %s", i, tok)
			}
			seen[tok] = struct{}{}
		}
	})

	t.Run("no token contains whitespace", func(t *testing.T) {
		for i, tok := range tokens {
			if strings.ContainsAny(tok, " \t\n\r\v\f") {
				t.Fatalf("token at index %d contains whitespace: %q", i, tok)
			}
		}
	})

	t.Run("every token has length at least 32 characters", func(t *testing.T) {
		for i, tok := range tokens {
			if len(tok) < 32 {
				t.Fatalf("token at index %d has length %d, want >= 32", i, len(tok))
			}
		}
	})
}