export function addUniqueDiagnostic(diagnostic: FileDiagnostic, diagnostics: DiagnosticCollection): void {
    const uri = Uri.file(diagnostic.filePath);

    const fileDiagnostics = diagnostics.get(uri);

    if (!fileDiagnostics) {
        // No diagnostics for the file
        // The diagnostic is unique
        diagnostics.set(uri, [diagnostic.diagnostic]);
    } else if (isUniqueDiagnostic(diagnostic.diagnostic, fileDiagnostics)) {
        const newFileDiagnostics = fileDiagnostics.concat([diagnostic.diagnostic]);
        diagnostics.set(uri, newFileDiagnostics);
    }
}

async function doValidate(document: TextDocument) {
	let report = null;

	let documentWasClosed = false; // track whether the document was closed while getInstalledModules/'npm ls' runs
	const listener = workspace.onDidCloseTextDocument(doc => {
		if (doc.uri === document.uri) {
			documentWasClosed = true;
		}
	});

	try {
		report = await getInstalledModules(path.dirname(document.fileName));
	} catch (e) {
		listener.dispose();
		return;
	}
	try {
		diagnosticCollection.clear();

		if (report.invalid && report.invalid === true) {
			return;
		}
		if (!anyModuleErrors(report)) {
			return;
		}
		if (documentWasClosed || !document.getText()) {
			return;
		}
		const sourceRanges = parseSourceRanges(document.getText());
		const dependencies = report.dependencies;
		const diagnostics: Diagnostic[] = [];

		for (var moduleName in dependencies) {
			if (dependencies.hasOwnProperty(moduleName)) {
				const diagnostic = getDiagnostic(document, report, moduleName, sourceRanges);
				if (diagnostic) {
					diagnostic.source = 'npm';
					diagnostics.push(diagnostic);
				}
			}
		}
		//console.log("diagnostic count ", diagnostics.length, " ", document.uri.fsPath);
		diagnosticCollection.set(document.uri, diagnostics);
	} catch (e) {
		window.showInformationMessage(`[npm-script-runner] Cannot validate the package.json ` + e);
		console.log(`npm-script-runner: 'error while validating package.json stacktrace: ${e.stack}`);
	}
}

function resetDiagnostics() {
    diagnosticCollection.clear();

    diagnosticMap.forEach((diags, file) => {
        diagnosticCollection.set(Uri.parse(file), diags);
    });
}

function loadConfiguration(context: ExtensionContext): void {
	const section = workspace.getConfiguration('npm');
	if (section) {
		validationEnabled = section.get<boolean>('validate.enable', true);
	}
	diagnosticCollection.clear();

	if (validationEnabled) {
		workspace.onDidSaveTextDocument(document => {
			validateDocument(document);
		}, null, context.subscriptions);
		window.onDidChangeActiveTextEditor(editor => {
			if (editor && editor.document) {
				validateDocument(editor.document);
			}
		}, null, context.subscriptions);

		// remove markers on close
		workspace.onDidCloseTextDocument(_document => {
			diagnosticCollection.clear();
		}, null, context.subscriptions);

		// workaround for onDidOpenTextDocument
		// workspace.onDidOpenTextDocument(document => {
		// 	console.log("onDidOpenTextDocument ", document.fileName);
		// 	validateDocument(document);
		// }, null, context.subscriptions);
		validateAllDocuments();
	}
}

	public reInitialize(): void {
		this.currentDiagnostics.clear();
		this.syntaxDiagnostics = Object.create(null);
		this.bufferSyncSupport.reOpenDocuments();
		this.bufferSyncSupport.requestAllDiagnostics();

	}

	public semanticDiagnosticsReceived(file: string, diagnostics: Diagnostic[]): void {
		let syntaxMarkers = this.syntaxDiagnostics[file];
		if (syntaxMarkers) {
			delete this.syntaxDiagnostics[file];
			diagnostics = syntaxMarkers.concat(diagnostics);
		}
		this.currentDiagnostics.set(Uri.file(file), diagnostics);
	}

	private handleErrors(notification: as.AnalysisErrorsNotification) {
		let errors = notification.errors;
		if (!config.showTodos)
			errors = errors.filter((error) => error.type != "TODO");
		this.diagnostics.set(
			Uri.file(notification.file), 
			errors.map(e => this.createDiagnostic(e))
		);
	}

	/* internal */ populateService(): void {
		this.currentDiagnostics.clear();
		this.syntaxDiagnostics = Object.create(null);
		// See https://github.com/Microsoft/TypeScript/issues/5530
		workspace.saveAll(false).then((value) => {
			this.bufferSyncSupports.forEach(support => {
				support.reOpenDocuments();
				support.requestAllDiagnostics();
			});
		});
	}

	private updateValidate(value: boolean) {
		if (this._validate === value) {
			return;
		}
		this._validate = value;
		this.bufferSyncSupport.validate = value;
		if (value) {
			this.triggerAllDiagnostics();
		} else {
			this.syntaxDiagnostics = Object.create(null);
			this.currentDiagnostics.clear();
		}
	}