package auth

import (
	"testing"

	"github.com/jfraeys/fetch_ml/internal/auth"
)

func TestGenerateAPIKey(t *testing.T) {
	t.Parallel() // Enable parallel execution
	key1 := auth.GenerateAPIKey()

	if len(key1) != 64 { // 32 bytes = 64 hex chars
		t.Errorf("Expected key length 64, got %d", len(key1))
	}

	// Test uniqueness
	key2 := auth.GenerateAPIKey()

	if key1 == key2 {
		t.Error("Generated keys should be unique")
	}
}

func TestHashAPIKey(t *testing.T) {
	t.Parallel() // Enable parallel execution
	key := "test-key-123"
	hash := auth.HashAPIKey(key)

	if len(hash) != 64 { // SHA256 = 64 hex chars
		t.Errorf("Expected hash length 64, got %d", len(hash))
	}

	// Test consistency
	hash2 := auth.HashAPIKey(key)
	if hash != hash2 {
		t.Error("Hash should be consistent for same key")
	}

	// Test different keys produce different hashes
	hash3 := auth.HashAPIKey("different-key")
	if hash == hash3 {
		t.Error("Different keys should produce different hashes")
	}
}

func TestValidateAPIKey(t *testing.T) {
	t.Parallel() // Enable parallel execution
	config := auth.AuthConfig{
		Enabled: true,
		APIKeys: map[auth.Username]auth.APIKeyEntry{
			"admin": {
				Hash:  auth.APIKeyHash(auth.HashAPIKey("admin-key")),
				Admin: true,
			},
			"data_scientist": {
				Hash:  auth.APIKeyHash(auth.HashAPIKey("ds-key")),
				Admin: false,
			},
		},
	}

	tests := []struct {
		name      string
		apiKey    string
		wantErr   bool
		wantUser  string
		wantAdmin bool
	}{
		{
			name:      "valid admin key",
			apiKey:    "admin-key",
			wantErr:   false,
			wantUser:  "admin",
			wantAdmin: true,
		},
		{
			name:      "valid user key",
			apiKey:    "ds-key",
			wantErr:   false,
			wantUser:  "data_scientist",
			wantAdmin: false,
		},
		{
			name:    "invalid key",
			apiKey:  "wrong-key",
			wantErr: true,
		},
		{
			name:    "empty key",
			apiKey:  "",
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			user, err := config.ValidateAPIKey(tt.apiKey)

			if tt.wantErr {
				if err == nil {
					t.Error("Expected error but got none")
				}
				return
			}

			if err != nil {
				t.Errorf("Unexpected error: %v", err)
				return
			}

			if user.Name != tt.wantUser {
				t.Errorf("Expected user %s, got %s", tt.wantUser, user.Name)
			}

			if user.Admin != tt.wantAdmin {
				t.Errorf("Expected admin %v, got %v", tt.wantAdmin, user.Admin)
			}
		})
	}
}

func TestValidateAPIKeyAuthDisabled(t *testing.T) {
	t.Setenv("FETCH_ML_ALLOW_INSECURE_AUTH", "1")
	defer t.Setenv("FETCH_ML_ALLOW_INSECURE_AUTH", "")

	config := auth.AuthConfig{
		Enabled: false,
		APIKeys: map[auth.Username]auth.APIKeyEntry{}, // Empty
	}

	user, err := config.ValidateAPIKey("any-key")
	if err != nil {
		t.Errorf("Unexpected error when auth disabled: %v", err)
	}

	if user == nil {
		t.Fatal("Expected user, got nil")
	}

	if user.Name != "default" {
		t.Errorf("Expected default user, got %s", user.Name)
	}

	if !user.Admin {
		t.Error("Default user should be admin")
	}
}

func TestAdminDetection(t *testing.T) {
	t.Parallel() // Enable parallel execution
	config := auth.AuthConfig{
		Enabled: true,
		APIKeys: map[auth.Username]auth.APIKeyEntry{
			"admin":      {Hash: auth.APIKeyHash(auth.HashAPIKey("key1")), Admin: true},
			"admin_user": {Hash: auth.APIKeyHash(auth.HashAPIKey("key2")), Admin: true},
			"superadmin": {Hash: auth.APIKeyHash(auth.HashAPIKey("key3")), Admin: true},
			"regular":    {Hash: auth.APIKeyHash(auth.HashAPIKey("key4")), Admin: false},
			"user_admin": {Hash: auth.APIKeyHash(auth.HashAPIKey("key5")), Admin: false},
		},
	}

	tests := []struct {
		apiKey   string
		expected bool
	}{
		{"key1", true},  // admin
		{"key2", true},  // admin_user
		{"key3", true},  // superadmin
		{"key4", false}, // regular
		{"key5", false}, // user_admin (not admin based on explicit flag)
	}

	for _, tt := range tests {
		t.Run(tt.apiKey, func(t *testing.T) {
			user, err := config.ValidateAPIKey(tt.apiKey)
			if err != nil {
				t.Fatalf("Unexpected error: %v", err)
			}
			if user.Admin != tt.expected {
				t.Errorf("Expected admin=%v for key %s, got %v", tt.expected, tt.apiKey, user.Admin)
			}
		})
	}
}