package infra

import (
	"strings"
	"testing"

	"golang.org/x/crypto/bcrypt"
)

func TestBcryptHtpasswd(t *testing.T) {
	t.Run("hash valido pasa CompareHashAndPassword", func(t *testing.T) {
		line, err := BcryptHtpasswd("lucas", "s3cr3t", 4)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		parts := strings.SplitN(line, ":", 2)
		if len(parts) != 2 {
			t.Fatalf("expected user:hash, got %q", line)
		}
		if err := bcrypt.CompareHashAndPassword([]byte(parts[1]), []byte("s3cr3t")); err != nil {
			t.Errorf("hash does not match password: %v", err)
		}
	})

	t.Run("formato es user:hash", func(t *testing.T) {
		line, err := BcryptHtpasswd("admin", "pass", 4)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if !strings.HasPrefix(line, "admin:") {
			t.Errorf("expected line to start with 'admin:', got %q", line)
		}
		parts := strings.SplitN(line, ":", 2)
		if len(parts) != 2 || parts[1] == "" {
			t.Errorf("expected non-empty hash after colon, got %q", line)
		}
	})

	t.Run("cost cero usa default 10", func(t *testing.T) {
		line, err := BcryptHtpasswd("user", "password", 0)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		parts := strings.SplitN(line, ":", 2)
		cost, err := bcrypt.Cost([]byte(parts[1]))
		if err != nil {
			t.Fatalf("could not extract cost: %v", err)
		}
		if cost != 10 {
			t.Errorf("expected cost 10, got %d", cost)
		}
	})

	t.Run("error si user vacio", func(t *testing.T) {
		_, err := BcryptHtpasswd("", "pass", 4)
		if err == nil {
			t.Error("expected error for empty user, got nil")
		}
	})

	t.Run("error si password vacio", func(t *testing.T) {
		_, err := BcryptHtpasswd("user", "", 4)
		if err == nil {
			t.Error("expected error for empty password, got nil")
		}
	})

	t.Run("error si cost fuera de rango", func(t *testing.T) {
		_, err := BcryptHtpasswd("user", "pass", 32)
		if err == nil {
			t.Error("expected error for cost=32, got nil")
		}
		_, err = BcryptHtpasswd("user", "pass", 3)
		if err == nil {
			t.Error("expected error for cost=3, got nil")
		}
	})
}