//
//  main.m
//  Advanter
//
//  Created by Chris Jones on 21/06/2019.
//  Copyright © 2019 Chris Jones. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <AppKit/AppKit.h>
#import <Carbon/Carbon.h> // Needed for the CGEventRef stuff

static CGEventSourceRef eventSource = NULL;

NSRunningApplication *appForName(NSString *name) {
    for (NSRunningApplication *runningApp in [[NSWorkspace sharedWorkspace] runningApplications]) {
        if ([name isEqualToString:runningApp.localizedName ]) {
            return runningApp;
        }
    }
    return nil;
}

NSRunningApplication *appForPID(pid_t pid) {
    NSRunningApplication *app = [NSRunningApplication runningApplicationWithProcessIdentifier:pid];
    if (!app) {
        printf("Failed to find app\n");
        exit(1);
    }
    return app;
}

BOOL activateApp(NSRunningApplication *app) {
    // This option steals focus, it's rude, but effective
    return [app activateWithOptions:NSApplicationActivateIgnoringOtherApps];
}

BOOL raiseApp(NSRunningApplication *app) {
    ProcessSerialNumber psn;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    GetProcessForPID(app.processIdentifier, &psn);
    return (SetFrontProcessWithOptions(&psn, 0) == noErr);
#pragma clang diagnostic pop
}

// The keycodes are a bit tedious, they're listed in HIToolbox/Events.h
void sendKey(NSRunningApplication *app, CGEventFlags flags, CGKeyCode keyCode) {
    CGEventRef event = CGEventCreateKeyboardEvent(eventSource, keyCode, true);
    CGEventRef eventRelease = CGEventCreateKeyboardEvent(eventSource, keyCode, false);

    CGEventSetFlags(event, flags);
    CGEventSetFlags(eventRelease, flags);

    // If you only care about 10.11+ you can skip this junk and use CGEventPostToPid()
    ProcessSerialNumber psn;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    OSStatus err = GetProcessForPID(app.processIdentifier, &psn);
#pragma clang diagnostic pop
    if (err != noErr) {
        printf("Failed to get PSN for pid.\n");
        exit(1);
    }

    printf("Sending keycode: %d\n", keyCode);

    CGEventPostToPSN(&psn, event);
    usleep(1000);

    CGEventPostToPSN(&psn, eventRelease);
    usleep(1000);

    CFRelease(event);
    CFRelease(eventRelease);
}

int main(int argc, const char * argv[]) {
    if (argc != 2) {
        printf("Usage: %s APPNAME\n", argv[0]);
        exit(1);
    }

    @autoreleasepool {
        NSString *appName = [NSString stringWithUTF8String:argv[1]];
        NSRunningApplication *app = appForName(appName);
        // NSRunningApplication *app = appForPID(12345);

        activateApp(app);
        raiseApp(app);

        eventSource = CGEventSourceCreate(kCGEventSourceStatePrivate);

        sendKey(app, kCGEventFlagMaskCommand, kVK_ANSI_L);

        CGKeyCode characters[] = {
            kVK_ANSI_W,
            kVK_ANSI_W,
            kVK_ANSI_W,
            kVK_ANSI_Period,
            kVK_ANSI_C,
            kVK_ANSI_N,
            kVK_ANSI_N,
            kVK_ANSI_Period,
            kVK_ANSI_C,
            kVK_ANSI_O,
            kVK_ANSI_M};
        size_t numCharacters = sizeof(characters) / sizeof(CGKeyCode);

        for (int i = 0; i < numCharacters; i++) {
            sendKey(app, 0, characters[i]);
        }

        sendKey(app, 0, kVK_Return);

    }
    return 0;
}