// Progressive scope acquisition - request minimal scopes initially
const INITIAL_SCOPES = ['User.Read'];
const GRAPH_SCOPES = [
    'User.Read',
    'Calendars.Read',
    'Mail.Read',
    'Presence.Read',
    'People.Read'
];

// Get token with automatic scope upgrade
async function getGraphToken(): Promise<string | null> {
    const session = await vscode.authentication.getSession(
        'microsoft',
        GRAPH_SCOPES,
        { createIfNone: false }
    );
    return session?.accessToken ?? null;
}

// Check availability without triggering auth prompt
function isGraphAvailable(): boolean {
    return !!cachedToken && isEnterpriseMode();
}

const GRAPH_ENDPOINT = 'https://graph.microsoft.com/v1.0';

async function graphFetch<T>(path: string): Promise<T | null> {
    const token = await getGraphToken();
    if (!token) return null;
    
    const response = await fetch(`${GRAPH_ENDPOINT}${path}`, {
        headers: { 'Authorization': `Bearer ${token}` }
    });
    
    if (!response.ok) {
        console.error(`Graph API error: ${response.status}`);
        return null;
    }
    
    return response.json();
}

// Check enterprise mode is enabled
function isEnterpriseMode(): boolean {
    const config = vscode.workspace.getConfiguration('alex.enterprise');
    return config.get<boolean>('enabled', false);
}

// Check specific feature is enabled
function isCalendarEnabled(): boolean {
    if (!isEnterpriseMode()) return false;
    const config = vscode.workspace.getConfiguration('alex.enterprise.graph');
    return config.get<boolean>('calendarEnabled', true);
}

// In WebviewView provider
private getHtmlContent(): string {
    const showEnterprise = isEnterpriseMode();
    const graphConnected = isGraphAvailable();
    
    return `
        ${showEnterprise ? `
            <section class="enterprise">
                <h3>Enterprise</h3>
                ${graphConnected 
                    ? this.getGraphButtons() 
                    : this.getSignInButton()}
            </section>
        ` : ''}
    `;
}

{
    "commands": [
        {
            "name": "calendar",
            "description": "View upcoming calendar events",
            "when": "config.alex.enterprise.enabled"
        }
    ]
}

{
    "alex.enterprise.enabled": {
        "type": "boolean",
        "default": false,
        "description": "Master toggle for enterprise features"
    },
    "alex.enterprise.graph.enabled": {
        "type": "boolean", 
        "default": true,
        "description": "Enable Microsoft Graph integration"
    },
    "alex.enterprise.graph.calendarEnabled": {
        "type": "boolean",
        "default": true,
        "description": "Feature-specific toggle"
    },
    "alex.enterprise.graph.calendarDaysAhead": {
        "type": "number",
        "default": 7,
        "minimum": 1,
        "maximum": 30,
        "description": "Feature-specific configuration"
    }
}

interface IAlexChatResult extends vscode.ChatResult {
    metadata?: {
        command?: string;
        // Command-specific metadata
        eventCount?: number;
        messageCount?: number;
        error?: boolean;
    };
}

async function handleCalendarCommand(
    request: vscode.ChatRequest,
    stream: vscode.ChatResponseStream,
    token: vscode.CancellationToken
): Promise<IAlexChatResult> {
    // Check prerequisites
    if (!isEnterpriseMode()) {
        stream.markdown('Enterprise mode is not enabled.');
        return { metadata: { command: 'calendar', error: true } };
    }
    
    if (!isGraphAvailable()) {
        stream.markdown('Please sign in to Microsoft Graph first.');
        return { metadata: { command: 'calendar', error: true } };
    }
    
    // Execute feature logic
    const events = await getCalendarEvents();
    stream.markdown(formatCalendarEvents(events));
    
    return { 
        metadata: { 
            command: 'calendar', 
            eventCount: events.length 
        } 
    };
}