package password

import (
	"testing"
)

func TestHashAndVerify(t *testing.T) {
	password := "Demo123!"
	
	// Test hashing
	hash, err := Hash(password)
	if err != nil {
		t.Fatalf("Failed to hash password: %v", err)
	}
	
	// Test that hash is not empty
	if hash == "" {
		t.Fatal("Hash should not be empty")
	}
	
	// Test that hash contains expected format
	if hash[:9] != "$argon2id" {
		t.Fatal("Hash should start with $argon2id")
	}
	
	// Test verification with correct password
	valid, err := Verify(password, hash)
	if err != nil {
		t.Fatalf("Failed to verify password: %v", err)
	}
	if !valid {
		t.Fatal("Password should be valid")
	}
	
	// Test verification with incorrect password
	valid, err = Verify("wrongpassword", hash)
	if err != nil {
		t.Fatalf("Failed to verify wrong password: %v", err)
	}
	if valid {
		t.Fatal("Wrong password should not be valid")
	}
	
	// Test that hashing same password twice produces different hashes (due to salt)
	hash2, err := Hash(password)
	if err != nil {
		t.Fatalf("Failed to hash password second time: %v", err)
	}
	if hash == hash2 {
		t.Fatal("Hashing same password twice should produce different hashes due to salt")
	}
	
	// But both hashes should verify correctly
	valid, err = Verify(password, hash2)
	if err != nil {
		t.Fatalf("Failed to verify second hash: %v", err)
	}
	if !valid {
		t.Fatal("Second hash should also be valid")
	}
}