import { Engine } from "./engine";
import { Player } from "./Player";
import { Settings } from "./Settings/Settings";

import { initializeMainMenuLinks } from "./ui/MainMenu/Links";

import { exceptionAlert } from "../utils/helpers/exceptionAlert";
import { clearEventListeners } from "../utils/uiHelpers/clearEventListeners";
import { createElement } from "../utils/uiHelpers/createElement";
import { createPopup } from "../utils/uiHelpers/createPopup";
import { removeElementById } from "../utils/uiHelpers/removeElementById";


// Ordered array of keys to Interactive Tutorial Steps
const orderedITutorialSteps = [
    "Start",
    "GoToCharacterPage",                // Click on 'Stats' page
    "CharacterPage",                    // Introduction to 'Stats' page
    "CharacterGoToTerminalPage",        // Go back to Terminal
    "TerminalIntro",                    // Introduction to Terminal
    "TerminalHelp",                     // Using 'help' Terminal command
    "TerminalLs",                       // Using 'ls' Terminal command
    "TerminalScan",                     // Using 'scan' Terminal command
    "TerminalScanAnalyze1",             // Using 'scan-analyze' Terminal command
    "TerminalScanAnalyze2",             // Using 'scan-analyze 3' Terminal command
    "TerminalConnect",                  // Connecting to foodnstuff
    "TerminalAnalyze",                  // Analyzing foodnstuff
    "TerminalNuke",                     // NUKE foodnstuff
    "TerminalManualHack",               // Hack foodnstuff
    "TerminalHackingMechanics",         // Explanation of hacking mechanics
    "TerminalCreateScript",             // Create a script using 'nano'
    "TerminalTypeScript",               // Script Editor page - Type script and then save & close
    "TerminalFree",                     // Using 'Free' Terminal command
    "TerminalRunScript",                // Running script using 'run' Terminal command
    "TerminalGoToActiveScriptsPage",
    "ActiveScriptsPage",
    "ActiveScriptsToTerminal",
    "TerminalTailScript",
    "GoToHacknetNodesPage",
    "HacknetNodesIntroduction",
    "HacknetNodesGoToWorldPage",
    "WorldDescription",
    "TutorialPageInfo",
    "End"
]

// Create an 'enum' for the Steps
const iTutorialSteps = {};
for (let i = 0; i < orderedITutorialSteps.length; ++i) {
    iTutorialSteps[orderedITutorialSteps[i]] = i;
}

var ITutorial = {
    currStep:   0, // iTutorialSteps.Start
    isRunning:  false,

    // Keeps track of whether each step has been done
    stepIsDone: {},
}

function iTutorialStart() {
    // Initialize Interactive Tutorial state by settings 'done' for each state to false
    ITutorial.stepIsDone = {};
    for (let i = 0; i < orderedITutorialSteps.length; ++i) {
        ITutorial.stepIsDone[i] = false;
    }

    Engine.loadTerminalContent();

    // Don't autosave during this interactive tutorial
    Engine.Counters.autoSaveCounter = Infinity;
    console.log("Interactive Tutorial started");
    ITutorial.currStep = 0;
    ITutorial.isRunning = true;

    document.getElementById("interactive-tutorial-container").style.display = "block";

    // Exit tutorial button
    var exitButton = clearEventListeners("interactive-tutorial-exit");
    exitButton.addEventListener("click", function() {
        iTutorialEnd();
        return false;
    });

    // Back button
    var backButton = clearEventListeners("interactive-tutorial-back");
    backButton.addEventListener("click", function() {
        iTutorialPrevStep();
        return false;
    });

    // Next button
    var nextButton = clearEventListeners("interactive-tutorial-next");
    nextButton.addEventListener("click", function() {
        iTutorialNextStep();
        return false;
    });

    iTutorialEvaluateStep();
}

function iTutorialEvaluateStep() {
    if (!ITutorial.isRunning) {console.log("Interactive Tutorial not running"); return;}

    // Disable and clear main menu
    var terminalMainMenu        = clearEventListeners("terminal-menu-link");
    var statsMainMenu           = clearEventListeners("stats-menu-link");
    var activeScriptsMainMenu   = clearEventListeners("active-scripts-menu-link");
    var hacknetMainMenu         = clearEventListeners("hacknet-nodes-menu-link");
    var cityMainMenu            = clearEventListeners("city-menu-link");
    var tutorialMainMenu        = clearEventListeners("tutorial-menu-link");
    terminalMainMenu.removeAttribute("class");
    statsMainMenu.removeAttribute("class");
    activeScriptsMainMenu.removeAttribute("class");
    hacknetMainMenu.removeAttribute("class");
    cityMainMenu.removeAttribute("class");
    tutorialMainMenu.removeAttribute("class");

    // Interactive Tutorial Next button
    var nextBtn = document.getElementById("interactive-tutorial-next");

    switch(ITutorial.currStep) {
    case iTutorialSteps.Start:
        Engine.loadTerminalContent();
        iTutorialSetText("Welcome to Bitburner, a cyberpunk-themed incremental RPG! " +
                         "The game takes place in a dark, dystopian future...The year is 2077...<br><br>" +
                         "This tutorial will show you the basics of the game. " +
                         "You may skip the tutorial at any time.");
        nextBtn.style.display = "inline-block";
        break;
    case iTutorialSteps.GoToCharacterPage:
        Engine.loadTerminalContent();
        iTutorialSetText("Let's start by heading to the Stats page. Click the 'Stats' tab on " +
                         "the main navigation menu (left-hand side of the screen)");
        nextBtn.style.display = "none";

        // Flash 'Stats' menu and set its tutorial click handler
        statsMainMenu.setAttribute("class", "flashing-button");
        statsMainMenu.addEventListener("click", function() {
            Engine.loadCharacterContent();
            iTutorialNextStep(); //Opening the character page will go to the next step
            return false;
        });
        break;
    case iTutorialSteps.CharacterPage:
        Engine.loadCharacterContent();
        iTutorialSetText("The Stats page shows a lot of important information about your progress, " +
                         "such as your skills, money, and bonuses/multipliers. ")
        nextBtn.style.display = "inline-block";
        break;
    case iTutorialSteps.CharacterGoToTerminalPage:
        Engine.loadCharacterContent();
        iTutorialSetText("Let's head to your computer's terminal by clicking the 'Terminal' tab on the " +
                         "main navigation menu.");
        nextBtn.style.display = "none";

        // Flash 'Terminal' menu and set its tutorial click handler
        terminalMainMenu.setAttribute("class", "flashing-button");
        terminalMainMenu.addEventListener("click", function() {
            Engine.loadTerminalContent();
            iTutorialNextStep();
            return false;
        });
        break;
    case iTutorialSteps.TerminalIntro:
        Engine.loadTerminalContent();
        iTutorialSetText("The Terminal is used to interface with your home computer as well as " +
                         "all of the other machines around the world.");
        nextBtn.style.display = "inline-block";
        break;
    case iTutorialSteps.TerminalHelp:
        Engine.loadTerminalContent();
        iTutorialSetText("Let's try it out. Start by entering the 'help' command into the Terminal " +
                         "(Don't forget to press Enter after typing the command)");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalLs:
        Engine.loadTerminalContent();
        iTutorialSetText("The 'help' command displays a list of all available Terminal commands, how to use them, " +
                         "and a description of what they do. <br><br>Let's try another command. Enter the 'ls' command");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalScan:
        Engine.loadTerminalContent();
        iTutorialSetText("'ls' is a basic command that shows all of the contents (programs/scripts) " +
                         "on the computer. Right now, it shows that you have a program called 'NUKE.exe' on your computer. " +
                         "We'll get to what this does later. <br><br>Using your home computer's terminal, you can connect " +
                         "to other machines throughout the world. Let's do that now by first entering " +
                         "the 'scan' command.");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalScanAnalyze1:
        Engine.loadTerminalContent();
        iTutorialSetText("The 'scan' command shows all available network connections. In other words, " +
                         "it displays a list of all servers that can be connected to from your " +
                         "current machine. A server is identified by either its IP or its hostname. <br><br> " +
                         "That's great and all, but there's so many servers. Which one should you go to? " +
                         "The 'scan-analyze' command gives some more detailed information about servers on the " +
                         "network. Try it now");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalScanAnalyze2:
        Engine.loadTerminalContent();
        iTutorialSetText("You just ran 'scan-analyze' with a depth of one. This command shows more detailed " +
                         "information about each server that you can connect to (servers that are a distance of " +
                         "one node away). <br><br> It is also possible to run 'scan-analyze' with " +
                         "a higher depth. Let's try a depth of two with the following command: 'scan-analyze 2'.")
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalConnect:
        Engine.loadTerminalContent();
        iTutorialSetText("Now you can see information about all servers that are up to two nodes away, as well " +
                         "as figure out how to navigate to those servers through the network. You can only connect to " +
                         "a server that is one node away. To connect to a machine, use the 'connect [ip/hostname]' command. You can type in " +
                         "the ip or the hostname, but dont use both.<br><br>" +
                         "From the results of the 'scan-analyze' command, we can see that the 'foodnstuff' server is " +
                         "only one node away. Let's connect so it now using: 'connect foodnstuff'");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalAnalyze:
        Engine.loadTerminalContent();
        iTutorialSetText("You are now connected to another machine! What can you do now? You can hack it!<br><br> In the year 2077, currency has " +
                         "become digital and decentralized. People and corporations store their money " +
                         "on servers and computers. Using your hacking abilities, you can hack servers " +
                         "to steal money and gain experience. <br><br> " +
                         "Before you try to hack a server, you should run diagnostics using the 'analyze' command");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalNuke:
        Engine.loadTerminalContent();
        iTutorialSetText("When the 'analyze' command finishes running it will show useful information " +
                         "about hacking the server. <br><br> For this server, the required hacking skill is only 1, " +
                         "which means you can hack it right now. However, in order to hack a server " +
                         "you must first gain root access. The 'NUKE.exe' program that we saw earlier on your " +
                         "home computer is a virus that will grant you root access to a machine if there are enough " +
                         "open ports.<br><br> The 'analyze' results shows that there do not need to be any open ports " +
                         "on this machine for the NUKE virus to work, so go ahead and run the virus using the " +
                         "'run NUKE.exe' command.");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalManualHack:
        Engine.loadTerminalContent();
        iTutorialSetText("You now have root access! You can hack the server using the 'hack' command. " +
                         "Try doing that now.");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalHackingMechanics:
        Engine.loadTerminalContent();
        iTutorialSetText("You are now attempting to hack the server. Note that performing a hack takes time and " +
                         "only has a certain percentage chance " +
                         "of success. This time and success chance is determined by a variety of factors, including " +
                         "your hacking skill and the server's security level.<br><br>" +
                         "If your attempt to hack the server is successful, you will steal a certain percentage " +
                         "of the server's total money. This percentage is affected by your hacking skill and " +
                         "the server's security level.<br><br>The amount of money on a server is not limitless. So, if " +
                         "you constantly hack a server and deplete its money, then you will encounter " +
                         "diminishing returns in your hacking.");
        nextBtn.style.display = "inline-block";
        break;
    case iTutorialSteps.TerminalCreateScript:
        Engine.loadTerminalContent();
        iTutorialSetText("Hacking is the core mechanic of the game and is necessary for progressing. However, " +
                         "you don't want to be hacking manually the entire time. You can automate your hacking " +
                         "by writing scripts!<br><br>To create a new script or edit an existing one, you can use the 'nano' " +
                         "command. Scripts must end with the '.script' extension. Let's make a script now by " +
                         "entering 'nano foodnstuff.script' after the hack command finishes running (Sidenote: Pressing ctrl + c" +
                         " will end a command like hack early)");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalTypeScript:
        Engine.loadScriptEditorContent("foodnstuff.script", "");
        iTutorialSetText("This is the script editor. You can use it to program your scripts. Scripts are " +
                         "written in the Netscript language, a programming language created for " +
                         "this game. <strong style='background-color:#444;'>There are details about the Netscript language in the documentation, which " +
                         "can be accessed in the 'Tutorial' tab on the main navigation menu. I highly suggest you check " +
                         "it out after this tutorial.</strong> For now, just copy " +
                         "and paste the following code into the script editor: <br><br>" +
                         "while(true) { <br>" +
                         "&nbsp;&nbsp;hack('foodnstuff'); <br>" +
                         "}<br><br> " +
                         "For anyone with basic programming experience, this code should be straightforward. " +
                         "This script will continuously hack the 'foodnstuff' server.<br><br>" +
                         "To save and close the script editor, press the button in the bottom left, or press ctrl + b.");
        nextBtn.style.display = "none"; // next step triggered in saveAndCloseScriptEditor() (Script.js)
        break;
    case iTutorialSteps.TerminalFree:
        Engine.loadTerminalContent();
        iTutorialSetText("Now we'll run the script. Scripts require a certain amount of RAM to run, and can be " +
                         "run on any machine which you have root access to. Different servers have different " +
                         "amounts of RAM. You can also purchase more RAM for your home server.<br><br>To check how much " +
                         "RAM is available on this machine, enter the 'free' command.");
        nextBtn.style.display = "none"; // next step triggered by terminal commmand
        break;
    case iTutorialSteps.TerminalRunScript:
        Engine.loadTerminalContent();
        iTutorialSetText("We have 16GB of free RAM on this machine, which is enough to run our " +
                         "script. Let's run our script using 'run foodnstuff.script'.");
        nextBtn.style.display = "none"; // next step triggered by terminal commmand
        break;
    case iTutorialSteps.TerminalGoToActiveScriptsPage:
        Engine.loadTerminalContent();
        iTutorialSetText("Your script is now running! The script might take a few seconds to 'fully start up'. " +
                         "Your scripts will continuously run in the background and will automatically stop if " +
                         "the code ever completes (the 'foodnstuff.script' will never complete because it " +
                         "runs an infinite loop). <br><br>These scripts can passively earn you income and hacking experience. " +
                         "Your scripts will also earn money and experience while you are offline, although at a " +
                         "much slower rate. <br><br> " +
                         "Let's check out some statistics for our running scripts by clicking the " +
                         "'Active Scripts' link in the main navigation menu.");
        nextBtn.style.display = "none";

        // Flash 'Active Scripts' menu and set its tutorial click handler
        activeScriptsMainMenu.setAttribute("class", "flashing-button");
        activeScriptsMainMenu.addEventListener("click", function() {
            Engine.loadActiveScriptsContent();
            iTutorialNextStep();
            return false;
        });
        break;
    case iTutorialSteps.ActiveScriptsPage:
        Engine.loadActiveScriptsContent();
        iTutorialSetText("This page displays stats/information about all of your scripts that are " +
                         "running across every existing server. You can use this to gauge how well " +
                         "your scripts are doing. Let's go back to the Terminal now using the 'Terminal' " +
                         "link.");
        nextBtn.style.display = "none";

        // Flash 'Terminal' button and set its tutorial click handler
        terminalMainMenu.setAttribute("class", "flashing-button");
        terminalMainMenu.addEventListener("click", function() {
            Engine.loadTerminalContent();
            iTutorialNextStep();
            return false;
        });
        break;
    case iTutorialSteps.ActiveScriptsToTerminal:
        Engine.loadTerminalContent();
        iTutorialSetText("One last thing about scripts, each active script contains logs that detail " +
                         "what it's doing. We can check these logs using the 'tail' command. Do that " +
                         "now for the script we just ran by typing 'tail foodnstuff.script'");
        nextBtn.style.display = "none"; // next step triggered by terminal command
        break;
    case iTutorialSteps.TerminalTailScript:
        Engine.loadTerminalContent();
        iTutorialSetText("The log for this script won't show much right now (it might show nothing at all) because it " +
                         "just started running...but check back again in a few minutes! <br><br>" +
                         "This pretty much covers the basics of hacking. To learn more about writing " +
                         "scripts using the Netscript language, select the 'Tutorial' link in the " +
                         "main navigation menu to look at the documentation. " +
                         "<strong style='background-color:#444;'>If you are an experienced JavaScript " +
                         "developer, I would highly suggest you check out the section on " +
                         "NetscriptJS/Netscript 2.0.</strong><br><br>For now, let's move on to something else!");
        nextBtn.style.display = "inline-block";
        break;
    case iTutorialSteps.GoToHacknetNodesPage:
        Engine.loadTerminalContent();
        iTutorialSetText("Hacking is not the only way to earn money. One other way to passively " +
                         "earn money is by purchasing and upgrading Hacknet Nodes. Let's go to " +
                         "the 'Hacknet Nodes' page through the main navigation menu now.");
        nextBtn.style.display = "none";

        // Flash 'Hacknet' menu and set its tutorial click handler
        hacknetMainMenu.setAttribute("class", "flashing-button");
        hacknetMainMenu.addEventListener("click", function() {
            Engine.loadHacknetNodesContent();
            iTutorialNextStep();
            return false;
        });
        break;
    case iTutorialSteps.HacknetNodesIntroduction:
        Engine.loadHacknetNodesContent();
        iTutorialSetText("From this page you can purchase new Hacknet Nodes and upgrade your " +
                         "existing ones. Let's purchase a new one now.");
        nextBtn.style.display = "none"; // Next step triggered by purchaseHacknet() (HacknetNode.js)
        break;
    case iTutorialSteps.HacknetNodesGoToWorldPage:
        Engine.loadHacknetNodesContent();
        iTutorialSetText("You just purchased a Hacknet Node! This Hacknet Node will passively " +
                         "earn you money over time, both online and offline. When you get enough " +
                         " money, you can upgrade " +
                         "your newly-purchased Hacknet Node below.<br><br>" +
                         "Let's go to the 'City' page through the main navigation menu.");
        nextBtn.style.display = "none";

        // Flash 'City' menu and set its tutorial click handler
        cityMainMenu.setAttribute("class", "flashing-button");
        cityMainMenu.addEventListener("click", function() {
            Engine.loadLocationContent();
            iTutorialNextStep();
            return false;
        });
        break;
    case iTutorialSteps.WorldDescription:
        Engine.loadLocationContent();
        iTutorialSetText("This page lists all of the different locations you can currently " +
                         "travel to. Each location has something that you can do. " +
                         "There's a lot of content out in the world, make sure " +
                         "you explore and discover!<br><br>" +
                         "Lastly, click on the 'Tutorial' link in the main navigation menu.");
        nextBtn.style.display = "none";

        // Flash 'Tutorial' menu and set its tutorial click handler
        tutorialMainMenu.setAttribute("class", "flashing-button");
        tutorialMainMenu.addEventListener("click", function() {
            Engine.loadTutorialContent();
            iTutorialNextStep();
            return false;
        });
        break;
    case iTutorialSteps.TutorialPageInfo:
        Engine.loadTutorialContent();
        iTutorialSetText("This page contains a lot of different documentation about the game's " +
                         "content and mechanics. <strong style='background-color:#444;'> I know it's a lot, but I highly suggest you read " +
                         "(or at least skim) through this before you start playing</strong>. That's the end of the tutorial. " +
                         "Hope you enjoy the game!");
        nextBtn.style.display = "inline-block";
        nextBtn.innerHTML = "Finish Tutorial";
        break;
    case iTutorialSteps.End:
        iTutorialEnd();
        break;
    default:
        throw new Error("Invalid tutorial step");
    }

    if (ITutorial.stepIsDone[ITutorial.currStep] === true) {
        nextBtn.style.display = "inline-block";
    }
}

// Go to the next step and evaluate it
function iTutorialNextStep() {
    // Special behavior for certain steps
    if (ITutorial.currStep === iTutorialSteps.GoToCharacterPage) {
        document.getElementById("stats-menu-link").removeAttribute("class");
    }
    if (ITutorial.currStep === iTutorialSteps.CharacterGoToTerminalPage) {
        document.getElementById("terminal-menu-link").removeAttribute("class");
    }
    if (ITutorial.currStep === iTutorialSteps.TerminalGoToActiveScriptsPage) {
        document.getElementById("active-scripts-menu-link").removeAttribute("class");
    }
    if (ITutorial.currStep === iTutorialSteps.ActiveScriptsPage) {
        document.getElementById("terminal-menu-link").removeAttribute("class");
    }
    if (ITutorial.currStep === iTutorialSteps.GoToHacknetNodesPage) {
        document.getElementById("hacknet-nodes-menu-link").removeAttribute("class");
    }
    if (ITutorial.currStep === iTutorialSteps.HacknetNodesGoToWorldPage) {
        document.getElementById("city-menu-link").removeAttribute("class");
    }
    if (ITutorial.currStep === iTutorialSteps.WorldDescription) {
        document.getElementById("tutorial-menu-link").removeAttribute("class");
    }

    ITutorial.stepIsDone[ITutorial.currStep] = true;
    if (ITutorial.currStep < iTutorialSteps.End) {
        ITutorial.currStep += 1;
    }
    iTutorialEvaluateStep();
}

// Go to previous step and evaluate
function iTutorialPrevStep() {
    if (ITutorial.currStep > iTutorialSteps.Start) {
        ITutorial.currStep -= 1;
    }
    iTutorialEvaluateStep();
}

function iTutorialEnd() {
    // Re-enable auto save
    if (Settings.AutosaveInterval === 0) {
        Engine.Counters.autoSaveCounter = Infinity;
    } else {
        Engine.Counters.autoSaveCounter = Settings.AutosaveInterval * 5;
    }

    console.log("Ending interactive tutorial");

    // Initialize references to main menu links
    // We have to call initializeMainMenuLinks() again because the Interactive Tutorial
    // re-creates Main menu links with clearEventListeners()
    if (!initializeMainMenuLinks()) {
        const errorMsg = "Failed to initialize Main Menu Links. Please try refreshing the page. " +
                         "If that doesn't work, report the issue to the developer";
        exceptionAlert(new Error(errorMsg));
        console.error(errorMsg);
        return;
    }
    Engine.init();

    ITutorial.currStep = iTutorialSteps.End;
    ITutorial.isRunning = false;
    document.getElementById("interactive-tutorial-container").style.display = "none";

    // Create a popup with final introductory stuff
    var popupId = "interactive-tutorial-ending-popup";
    var txt = createElement("p", {
        innerHTML:
        "If you are new to the game, the following links may be useful for you!<br><br>" +
        "<a class='a-link-button' href='https://bitburner.readthedocs.io/en/latest/guidesandtips/gettingstartedguideforbeginnerprogrammers.html' target='_blank'>Getting Started Guide</a>" +
        "<a class='a-link-button' href='https://bitburner.readthedocs.io/en/latest/' target='_blank'>Documentation</a><br><br>"  +
        "The Beginner's Guide to Hacking was added to your home computer! It contains some tips/pointers for starting out with the game. " +
        "To read it, go to Terminal and enter<br><br>cat hackers-starting-handbook.lit"
    });
    var gotitBtn = createElement("a", {
        class:"a-link-button", float:"right", padding:"6px", innerText:"Got it!",
        clickListener:()=>{
            removeElementById(popupId);
        }
    });
    createPopup(popupId, [txt, gotitBtn]);

    Player.getHomeComputer().messages.push("hackers-starting-handbook.lit");
}

function iTutorialSetText(txt) {
    var textBox = document.getElementById("interactive-tutorial-text");
    if (textBox == null) {throw new Error("Could not find text box"); return;}
    textBox.innerHTML = txt;
    textBox.parentElement.scrollTop = 0; // this resets scroll position
}

export {iTutorialSteps, iTutorialEnd, iTutorialStart, iTutorialNextStep, ITutorial};