/* --------------------------------------------------------------------------------------------
 * 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" || path.extname(file) == ".astypedef") {
                const filepath = directoryName + path.sep + file;
                var uri = "file://" + filepath;
                if (!allFiles.get(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;
});

let isInitialized =false;

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.getConfiguration('angelscript-languageserver.defines').then((config) => {
        let defines = config as string[];
        for (let index = 0; index < defines.length; index++) {
            const define = defines[index];
            database.addDefine(define);
        }    
    });

    connection.workspace.getConfiguration('angelscript-languageserver.engine-settings').then((config) => {
        for (const key in config) {
            if (Object.prototype.hasOwnProperty.call(config, key)) {
                const element = config[key];
                let keyValue : NativeWrapper.ASEngineProperty = NativeWrapper.ASEngineProperty[key as keyof typeof NativeWrapper.ASEngineProperty];
                database.setEngineProperty(keyValue, element);
            }
        }
    });


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


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 (!isInitialized){
        return;
    }
    if (change.document.languageId != "Angelscript" && change.document.languageId != "AngelscriptTypeDefinition")
        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" && textDocument.languageId != "AngelscriptTypeDefinition")
        return;
    if (!fs.existsSync(textDocument.uri.substr(7))) {
        allFiles.delete(textDocument.uri);
        return;
    }
    let text = textDocument.getText();
    if (path.extname(textDocument.uri) == ".astypedef") {
        database.loadTypeDef(textDocument.uri, text);
    } else {
        database.loadScript(textDocument.uri, text);
    }
}

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

    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;
        console.log('[ ' + msg.section + ' ] ' + msg.message);
        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: []});
    });
    console.log("Finished building");
    // 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();