/* --------------------------------------------------------------------------------------------
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License. See License.txt in the project root for license information.
 * ------------------------------------------------------------------------------------------ */
import {
	createConnection,
	TextDocuments,
	Diagnostic,
	DiagnosticSeverity,
	ProposedFeatures,
	InitializeParams,
	DidChangeConfigurationNotification,
	TextDocumentSyncKind,
	InitializeResult,
	Position,
} from 'vscode-languageserver';

import {
	TextDocument
} from 'vscode-languageserver-textdocument';

import * as NativeWrapper from './wrapper'
import * as fs from 'fs';
import * as path from 'path';

// Create a connection for the server, using Node's IPC as a transport.
// Also include all preview / proposed LSP features.
const connection = createConnection(ProposedFeatures.all);
const database = NativeWrapper.BuildDatabase();

//TODO: change these based on user settings
database.setEngineProperty(NativeWrapper.ASEngineProperty.asEP_DISALLOW_EMPTY_LIST_ELEMENTS, 1);
database.setEngineProperty(NativeWrapper.ASEngineProperty.asEP_DISALLOW_VALUE_ASSIGN_FOR_REF_TYPE, 0);
database.setEngineProperty(NativeWrapper.ASEngineProperty.asEP_ALLOW_UNSAFE_REFERENCES, 1);
database.setEngineProperty(NativeWrapper.ASEngineProperty.asEP_ALWAYS_IMPL_DEFAULT_CONSTRUCT, 1);
database.setEngineProperty(NativeWrapper.ASEngineProperty.asEP_AUTO_GARBAGE_COLLECT, 0);
database.setEngineProperty(NativeWrapper.ASEngineProperty.asEP_REQUIRE_ENUM_SCOPE, 1);
database.setEngineProperty(NativeWrapper.ASEngineProperty.asEP_PROPERTY_ACCESSOR_MODE, 2);
database.setEngineProperty(NativeWrapper.ASEngineProperty.asEP_COMPILER_WARNINGS, 2);

// Create a simple text document manager. 
let documents: TextDocuments<TextDocument> = new TextDocuments(TextDocument);
let allFiles: Map<string, TextDocument> = new Map<string, TextDocument>();

let hasConfigurationCapability: boolean = false;
let hasWorkspaceFolderCapability: boolean = false;
let hasDiagnosticRelatedInformationCapability: boolean = false;

function registerFiles(directoryName: string) {
	let files = fs.readdirSync(directoryName);
	files.forEach(function (file) {
		let f = fs.statSync(directoryName + path.sep + file);
		if (f.isDirectory()) {
			registerFiles(directoryName + path.sep + file)
		} else {
			if (path.extname(file) == ".as") {
				const filepath = directoryName + path.sep + file;
				var uri = "file://" + filepath;
				if (!allFiles.get(uri)) {
					connection.console.log("Loaded new file at uri " + uri);
					let td = TextDocument.create(uri, "Angelscript", 0, fs.readFileSync(filepath, 'utf8'));
					allFiles.set(uri, td);
				}
			}
		}
	})
}

connection.onInitialize((params: InitializeParams) => {
	let capabilities = params.capabilities;

	hasConfigurationCapability = !!(
		capabilities.workspace && !!capabilities.workspace.configuration
	);
	hasWorkspaceFolderCapability = !!(
		capabilities.workspace && !!capabilities.workspace.workspaceFolders
	);
	hasDiagnosticRelatedInformationCapability = !!(
		capabilities.textDocument &&
		capabilities.textDocument.publishDiagnostics &&
		capabilities.textDocument.publishDiagnostics.relatedInformation
	);

	const result: InitializeResult = {
		capabilities: {
			textDocumentSync: TextDocumentSyncKind.Incremental,
		}
	};
	if (hasWorkspaceFolderCapability) {
		result.capabilities.workspace = {
			workspaceFolders: {
				supported: true
			}
		};
	}
	return result;
});

connection.onInitialized(() => {
	if (hasConfigurationCapability) {
		// Register for all configuration changes.
		connection.client.register(DidChangeConfigurationNotification.type, undefined);
	}
	if (hasWorkspaceFolderCapability) {
		connection.workspace.
			connection.workspace.onDidChangeWorkspaceFolders(_event => {
				connection.console.log('Workspace folder change event received.');
			});
	}

	connection.workspace.getWorkspaceFolders().then((ws) => {
		ws?.forEach(element => {
			registerFiles(element.uri.substr(7))
		});
		database.reset();
		allFiles.forEach(loadScript);
		validateBuild();
	})
});


connection.onDidChangeConfiguration(change => {
});

// The content of a text document has changed. This event is emitted
// when the text document first opened or when its content has changed.
documents.onDidChangeContent(change => {
	if (change.document.languageId != "Angelscript")
		return;
	var current = allFiles.get(change.document.uri);
	if (current != null && current != change.document){
		if (current.version == 0){
			allFiles.set(change.document.uri, change.document);
			return;
		}
	}
	else if (current == null){
		allFiles.set(change.document.uri, change.document);
	}

	database.reset();
	allFiles.forEach(loadScript);
	validateBuild();
});

function convertSeverity(type: NativeWrapper.MessageType): DiagnosticSeverity {
	switch (type) {
		case NativeWrapper.MessageType.Information:
			return DiagnosticSeverity.Information;
		case NativeWrapper.MessageType.Warning:
			return DiagnosticSeverity.Warning;
		case NativeWrapper.MessageType.Error:
			return DiagnosticSeverity.Error;
	}
}

function loadScript(textDocument: TextDocument): void {
	if (textDocument.languageId != "Angelscript")
		return;
	if (!fs.existsSync(textDocument.uri.substr(7))){
		allFiles.delete(textDocument.uri);
		return;
	}
	let text = textDocument.getText();
	database.loadScript(textDocument.uri, text);
}

async function validateBuild(): Promise<void> {
	var r = database.build();
	if (r < -1) {
		connection.console.log(r.toString());
	}
	connection.console.log("Building");

	var messages = database.messages();
	let diagnostics: Map<string, Diagnostic[]> = new Map<string, Diagnostic[]>();

	for (let i = 0; i < messages.length; i++) {
		let msg = messages[i];
		if (msg.type == NativeWrapper.MessageType.Information)
			continue;
		if (msg.section == ""){
			if (msg.type == NativeWrapper.MessageType.Error){
				connection.window.showErrorMessage(msg.message);
			}
			else if (msg.type == NativeWrapper.MessageType.Warning){
				connection.window.showWarningMessage(msg.message);
			}
			continue;
		}
		let startPos = Position.create(msg.row - 1, msg.col - 1);
		if (startPos.line < 0) startPos.line = 0;
		if (startPos.character < 0) startPos.character = 0;
		let textDocument = documents.get(msg.section);
		if (textDocument == undefined)
			continue;
		let offset = textDocument.offsetAt(startPos);
		let diagnostic: Diagnostic = {
			severity: convertSeverity(msg.type),
			range: {
				start: startPos,
				end: textDocument.positionAt(offset + 1)
			},
			message: msg.message,
			source: 'Angelscript'
		};
		if (msg.type == NativeWrapper.MessageType.Error){
			connection.console.error(`[${msg.section}:${msg.row - 1},${msg.col - 1}] ${msg.message}`)
		}

		var diag = diagnostics.get(msg.section);
		if (diag) {
			diag.push(diagnostic)
		}
		else {
			diagnostics.set(msg.section, [diagnostic]);
		}
	}

	documents.all().forEach(element => {
		let v = diagnostics.get(element.uri);
		if (v)
			connection.sendDiagnostics({ uri: element.uri, diagnostics: v });
		else
			connection.sendDiagnostics({ uri: element.uri, diagnostics: [] });
	});
	// Send the computed diagnostics to VSCode.
}

connection.onDidChangeWatchedFiles(_change => {
	// Monitored files have change in VSCode
	connection.console.log('We received an file change event');
});

// Make the text document manager listen on the connection
// for open, change and close text document events
documents.listen(connection);

// Listen on the connection
connection.listen();