import * as vscode from 'vscode';
import { CompletionStrategy } from './CompletionStrategy';

export class BuiltInCompletion implements CompletionStrategy {
    
    public provideCompletions(document: vscode.TextDocument, position: vscode.Position, linePrefix: string): vscode.CompletionItem[] | undefined {
        const items: vscode.CompletionItem[] = [];

        // Prüft, ob wir im Namespace "log." oder "discovery." sind (auch wenn man danach weiter tippt!)
        const match = linePrefix.match(/\b(log|discovery)\.([a-zA-Z0-9_]*)$/);
        
        if (match) {
            const namespace = match[1];

            if (namespace === 'log') {
                const levels = ['debug', 'info', 'warn', 'error'];
                for (const level of levels) {
                    const item = new vscode.CompletionItem(level, vscode.CompletionItemKind.Method);
                    item.insertText = new vscode.SnippetString(`${level}("\${1:message}");`);
                    item.documentation = new vscode.MarkdownString(`Schreibt eine Log-Meldung auf dem Level **${level}**.`);
                    items.push(item);
                }
            } 
            else if (namespace === 'discovery') {
                const runCmd = new vscode.CompletionItem('runCommand', vscode.CompletionItemKind.Method);
                runCmd.insertText = new vscode.SnippetString('runCommand(${1:host}, "${2:command}");');
                runCmd.detail = "discovery.runCommand(host, command)";
                items.push(runCmd);
            }
            return items; // Treffer gefunden, wir geben sie zurück!
        }

        return undefined; 
    }
}