const { workspace, window, commands } = require('vscode');
const shell = require('node-powershell');

function activate(context) {
    if (process.platform == 'win32') {
        const path = context.asAbsolutePath('./SetTransparency.cs');
        const ps = new shell({
            executionPolicy: 'RemoteSigned',
            noProfile: true,
        });
        context.subscriptions.push(ps);
        ps.addCommand('[Console]::OutputEncoding = [Text.Encoding]::UTF8');
        ps.addCommand(`Add-Type -Path '${path}'`);

        function setAlpha(alpha) {
            if (alpha < 1) {
                alpha = 1;
            } else if (alpha > 255) {
                alpha = 255;
            }

            ps.addCommand(`[GlassIt.SetTransParency]::SetTransParency(${process.pid}, ${alpha})`);
            ps.invoke().then(res => {
                console.log(res);
                console.log(`GlassIt: set alpha ${alpha}`);
                config().update('alpha', alpha, true);
            }).catch(err => {
                console.error(err);
                window.showErrorMessage(`GlassIt Error: ${err}`);
            });
        }
    } else if (process.platform == 'linux'){

        const cp = require('child_process');

        // Checking the weather xprop has installed
        try {
            cp.spawnSync('which xprop').toString();
        } catch (error){
            console.error(`GlassIt Error: Please install xprop package to use GlassIt.`);
            return;
        }

        // Retrieving the process ids of VS code
        const processIds = cp.execSync('pgrep \'code\'').toString().split('\n');
        processIds.pop();

        // Retrieving all window ids
        const allWindowIdsOutput = cp.execSync(
            `xprop -root | grep '_NET_CLIENT_LIST(WINDOW)'`
            ).toString();

        const allWindowIds = allWindowIdsOutput.match(/0x[\da-f]+/ig);

        const codeWindowIds = [];

        for(const windowId of allWindowIds){

            // Checking the weather the window has a associated process
            const hasProcessId = cp.execSync(`xprop -id ${windowId} _NET_WM_PID`).toString();

            if(!(hasProcessId.search('not found')+1)){
                // Extract process id from the result
               const winProcessId = hasProcessId.replace(/([a-zA-Z_\(\)\s\=])/g,'');
               if(processIds.includes(winProcessId)){
                    codeWindowIds.push(windowId);
               }
            }
        }

        function setAlpha(alpha){
            if (alpha < 1) {
                alpha = 1;
            } else if (alpha > 255) {
                alpha = 255;
            }

            for(const codeWindowId of codeWindowIds){
               cp.exec(`xprop  -id ${codeWindowId} -f _NET_WM_WINDOW_OPACITY 32c -set _NET_WM_WINDOW_OPACITY $(printf 0x%x $((0xffffffff * ${alpha} / 255)))`, function(error,stdout, stderr){
                    if (error) {
                        console.error(`GlassIt error: ${error}`);
                        return;
                    }

                    console.log(stdout.toString());
                    console.log(`GlassIt: set alpha ${alpha}`);
                    config().update('alpha', alpha, true);
               });
            }
        }
    } else {
        return;
    }

    console.log('Congratulations, your extension "GlassIt VSC" is now active!');

    const config = () => workspace.getConfiguration('glassit');


    context.subscriptions.push(commands.registerCommand('glassit.increase', () => {
        const alpha = config().get('alpha') - config().get('step');
        setAlpha(alpha);
    }));

    context.subscriptions.push(commands.registerCommand('glassit.decrease', () => {
        const alpha = config().get('alpha') + config().get('step');
        setAlpha(alpha);
    }));

    context.subscriptions.push(commands.registerCommand('glassit.maximize', () => {
        setAlpha(1);
    }));

    context.subscriptions.push(commands.registerCommand('glassit.minimize', () => {
        setAlpha(255);
    }));

    const alpha = config().get('alpha');
    setAlpha(alpha);
}
exports.activate = activate;

function deactivate() {
}
exports.deactivate = deactivate;