export const lessons = [
  {
    id: 'lesson1',
    title: '1. Introduction to Python',
    difficulty: 'easy',
    content: `
      <p>Let's learn some Python..</p>
      <p>We'll start with what's called a "Hello World" program to make sure everythings working.</p>
      <p>In Python, this is done with the <code>print</code> function.</p>
      <ol>
      <li>In the code editor below, type <code>print("Hello World")</code></li>
      <li>Click the "Run" button to execute your code</li>
      <li>You should see "Hello World" printed in the output area</li>
      </ol>
    `,
    objectives: [
      "Print \"Hello World\" to the console"
    ],
    doneCondition: (() => {


      return ({ lesson, code, consoleText, codeRanGood }) => {
        const progress = {
          stringDone: false
        };
        if (codeRanGood && !progress.stringDone && consoleText.includes("Hello World")) {
          progress.stringDone = true;
        }

        const missing = [];
        if (!progress.stringDone) missing.push("Hello World");

        let hint = "I still need you to print ";
        if (missing.length === 0) {
          hint = "";
        } else if (missing.length === 1) {
          hint += missing[0];
        } else {
          hint += missing.slice(0, -1).join(", ") + " and " + missing[missing.length - 1];
        }

        return {
          done: progress.stringDone,
          progressArray: Object.values(progress),
          hint
        };
      };
    })()
  },
  {
    id: 'lesson2',
    title: 'Data Types and Variables',
    difficulty: 'easy',
    content: `
      <p>Did you try typeing <code>print(Hello World)</code>, without the quotation marks?</p>
      <p>If you didn't, give it a try now.</p>
      </br>
      <p>Thats what we call a <strong>Syntax Error</strong>.</p>
      <p>Python doesn't know what the term (Hello World) means, the "" we added before tell Python that this is a "string", a series of characters that it doesn't need to try and understand, just to repeat.</p>
      </br>
      String is just one of the many <strong>Data Types</strong> that Python has.</p>
      To continue, I want you to print the following all at once, each on a new line:
      <ol>
      <li>String: <code>print("Hello World")</code></li>
      <li>Integer: <code>print(42)</code></li>  
      <li>Float: <code>print(3.14)</code></li>
      <li>Boolean: <code>print(True)</code></li>
      </ol>
      <p>Click the "Run" button to execute your code</p>
    `,
    objectives: [
      "Print a string to the console",
      "Print an int to the console",
      "Print a float to the console",
      "Print a boolean (True/False) to the console"
    ],
    doneCondition: (() => {


      const stringRegex = /print\s*\(\s*(['"]).*?\1\s*\)/;
      const intRegex = /(?<![\d.])[-+]?\d+(?![\d.])/;
      const floatRegex = /[-+]?(?:\d+\.\d*|\.\d+)(?:[eE][-+]?\d+)?/;
      const boolRegex = /\b(True|False|true|false)\b/;

      return ({ code, consoleText, codeRanGood }) => {
        const progress = {
          stringDone: false,
          intDone: false,
          floatDone: false,
          boolDone: false,
          // syntaxErrorDone: false, // optional
        };
        if (!codeRanGood) {
          return {
            done: false,
            hint: "Your code had an error — try fixing it and run again."
          };
        }

        if (!progress.stringDone && stringRegex.test(code)) {
          progress.stringDone = true;
        }
        if (!progress.floatDone && floatRegex.test(consoleText)) {
          progress.floatDone = true;
        }
        if (!progress.intDone && intRegex.test(consoleText)) {
          progress.intDone = true;
        }
        if (!progress.boolDone && boolRegex.test(consoleText)) {
          progress.boolDone = true;
        }

        const missing = [];
        if (!progress.stringDone) missing.push("string");
        if (!progress.floatDone) missing.push("float");
        if (!progress.intDone) missing.push("int");
        if (!progress.boolDone) missing.push("boolean");

        let hint = "I still need you to print a ";
        if (missing.length === 0) {
          hint = "";
        } else if (missing.length === 1) {
          hint += missing[0];
        } else {
          hint += missing.slice(0, -1).join(", ") + " and " + missing[missing.length - 1];
        }

        const done = progress.stringDone && progress.intDone && progress.floatDone && progress.boolDone;
        return {
          done,
          progressArray: Object.values(progress),
          hint
        };
      };
    })()

  },
  {
    id: 'lesson3',
    title: '3. Arithmetic Operations',
    difficulty: 'easy',
    content: `
      <p>Let's get python to do our math homework for us.</p>
      <p>Python can handle basic arithmetic operations like addition, subtraction, multiplication, and division.</p>
      <p>Try the following operations in the code editor:</p>
      <ol>
        <li>Addition: <code>print(5 + 3)</code></li>
        <li>Subtraction: <code>print(10 - 2)</code></li>
        <li>Multiplication: <code>print(4 * 7)</code></li>
        <li>Division: <code>print(20 / 5)</code></li>
        </ol>
    `,
    objectives: [
      "Do some addition",
      "Do some subtraction",
      "Do some multiplication",
      "Do some division",
    ],
    doneCondition: (() => {
      // Persistent tracking object inside closure


      return ({ code, consoleText, codeRanGood }) => {
        const progress = {
          addDone: false,
          subDone: false,
          mulDone: false,
          divDone: false,

        };

        if (!codeRanGood) {
          return {
            done: false,
            hint: ""
          };
        }

        // if (!progress.syntaxErrorDone && syntaxErrorRegex.test(text)) {
        //   progress.syntaxErrorDone = true;
        // }
        if (!progress.addDone && code.includes("+")) {
          progress.addDone = true;
        }
        if (!progress.subDone && code.includes("-")) {
          progress.subDone = true;
        }
        if (!progress.mulDone && code.includes("*")) {
          progress.mulDone = true;
        }
        if (!progress.divDone && code.includes("/")) {
          progress.divDone = true;
        }

        let missing = [];

        //if (!progress.syntaxErrorDone) missing.push("syntax error");
        //if (!progress.stringDone) missing.push("string");
        if (!progress.addDone) missing.push("addition");
        if (!progress.subDone) missing.push("subtraction");
        if (!progress.mulDone) missing.push("multiplication");
        if (!progress.divDone) missing.push("division");
        let hint = "I still need you to do some ";

        if (missing.length === 0) {
          hint = "";
        } else if (missing.length === 1) {
          hint += missing[0];
        } else {
          // Join all but last with comma, then add 'and' + last
          hint += missing.slice(0, -1).join(", ") + " and " + missing[missing.length - 1];
        }


        const done = progress.addDone && progress.subDone && progress.mulDone && progress.divDone;
        return {
          done,
          progressArray: Object.values(progress),
          hint
        };
      };
    })()
  },
  {
    id: 'lesson4',
    title: '4. Variables',
    difficulty: 'easy',
    content: `
      <p>It's common for us to need to keep some data or objects over multiple lines, for that we use <strong>variables</strong>.</p>
      <p>Think of a variable as a container that holds an object for us to use later.</p>
      <p>To make one, we only need to give it a name, and assign it a value.</p>
      <p><code>bob = 32</code></p>
      <p>In this case, we created a variable called <code>bob</code> and assigned it the value <code>32</code>.</p>
      <p>As far as Python is concerned, <code>bob</code> is just a name for the number <code>32</code>.</p>
      <p>Lets test it</p>
      <ol>
      <li>Initialize bob with the value 32: <code>bob = 32</code></li>
      <li>Print the value of bob: <code>print(bob)</code></
      </ol>
    `,
    objectives: [
      "Initialize a variable with a value",
      "Print the variable using print()"
    ],
    doneCondition: (() => {


      return ({ code, consoleText, codeRanGood }) => {
        const progress = {
          varCreated: false,
          varPrinted: false,
          varName: null,
        };
        if (!codeRanGood) {
          return {
            done: false,
            hint: ""
          };
        }
        const assignMatch = code.match(/^\s*([a-zA-Z_][a-zA-Z0-9_]*)\s*=/m);
        if (assignMatch) {
          progress.varName = assignMatch[1];
          progress.varCreated = true;
        } else {
          progress.varCreated = false;
          progress.varName = null;
          progress.varPrinted = false;
        }

        if (progress.varCreated && progress.varName) {
          const printRegex = new RegExp(`print\\s*\\(\\s*${progress.varName}\\s*\\)`);
          if (printRegex.test(code)) {
            progress.varPrinted = true;
          } else {
            progress.varPrinted = false;
          }
        }

        console.log('varCreated:', progress.varCreated, 'varPrinted:', progress.varPrinted);

        let missing = [];
        if (!progress.varCreated) missing.push("create a variable");
        if (!progress.varPrinted) missing.push("print the variable");

        let hint = "I still need you to ";
        if (missing.length === 0) {
          hint = "";
        } else if (missing.length === 1) {
          hint += missing[0];
        } else {
          hint += missing.slice(0, -1).join(", ") + " and " + missing[missing.length - 1];
        }

        const done = progress.varCreated && progress.varPrinted;
        return {
          done,
          progressArray: Object.values(progress),
          hint
        };
      };
    })()
  },
  {
    id: 'lesson5',
    title: '5. More on Variables',
    difficulty: 'easy',
    content: `
      <p>A variable will act like any other object of its data type.</p>
      <p>For example, if we have a variable called <code>bob</code> with the value <code>32</code>, we can do math with it:</p>
      <p><code>print(bob + 10)</code> will print <code>42</code>.</p>
      </br>
      <p>We can also change the value of a variable:</p>
      <pre><code> 
bob = 32
print(bob)
bob = bob + 10
print(bob)
      </code></pre>
    <p>In this example, the first time you print bob it will give his initial value of 32, but the second time we have added 10 to bob.</p>
    <p>Give it a try.</p>
    `,
    objectives: [
      "Initialize a variable with a value",
      "Print the variable using print()",
      "Alter the value of the variable",
      "Print the variable again using print()",
    ],
    doneCondition: (() => {


      return ({ code, consoleText, codeRanGood }) => {
        const progress = {
          varCreated: false,
          varPrinted: false,
          varArithmeticDone: false,
          varPrintedTwice: false,
        };
        if (!codeRanGood) {
          return {
            done: false,
            progressArray: Object.values(progress),
            hint: ""
          };
        }

        const assignRegex = /^(\w+)\s*=\s*.+$/m;
        const assignMatch = assignRegex.exec(code);
        if (!assignMatch) {
          return {
            done: false,
            progressArray: Object.values(progress),
            hint: "I still need you to create a variable"
          };
        }

        const varName = assignMatch[1];

        const printRegex = new RegExp(`print\\s*\\(\\s*${varName}\\s*\\)`, "g");
        const assignAllRegex = new RegExp(`^${varName}\\s*=.+$`, "gm");
        const arithmeticRegex = new RegExp(
          `^${varName}\\s*=\\s*${varName}\\s*[+\\-*/]\\s*.+$|^${varName}\\s*[+\\-*/]=\\s*.+$`,
          "gm"
        );

        progress.varCreated = true;

        const printMatches = [...code.matchAll(printRegex)];
        progress.varPrinted = printMatches.length > 0;
        if (!progress.varPrinted) {
          return {
            done: false,
            progressArray: Object.values(progress),
            hint: "I still need you to print the variable"
          };
        }

        progress.varArithmeticDone = arithmeticRegex.test(code);
        if (!progress.varArithmeticDone) {
          return {
            done: false,
            progressArray: Object.values(progress),

            hint: "I still need you to alter the variable (e.g. with arithmetic)"
          };
        }

        const assignMatches = [...code.matchAll(assignAllRegex)];
        if (assignMatches.length < 2) {
          return {
            done: false,
            progressArray: Object.values(progress),
            hint: "I still need you to alter the variable before printing it again"
          };
        }

        // Debug logs
        console.log("Variable:", varName);
        console.log("Assignments found:", assignMatches.length);
        assignMatches.forEach((m, i) =>
          console.log(`Assign #${i}: index=${m.index}, text=${m[0].trim()}`)
        );
        console.log("Prints found:", printMatches.length);
        printMatches.forEach((m, i) =>
          console.log(`Print #${i}: index=${m.index}, text=${code.slice(m.index, m.index + 20)}`)
        );
        console.log("Arithmetic detected:", progress.varArithmeticDone);

        const secondAssignIndex = assignMatches[1].index;
        progress.varPrintedTwice = printMatches.some((m) => m.index > secondAssignIndex);

        if (!progress.varPrintedTwice) {
          return {
            done: false,
            progressArray: Object.values(progress),
            hint: "I still need you to print the variable a second time after altering it",
          };
        }

        return {
          done: true,
          progressArray: Object.values(progress),
          hint: "",
        };
      };
    })()

  },
  {
    id: 'lesson6',
    title: '6. Conditionals',
    difficulty: 'easy',
    content: `
      <p>Sometimes we want don't want part of our code to run, or we want it to run differently in different situations. That's when we use <strong>conditionals</strong>.</p>
      <pre><code>
bob = 5
if bob > 10:
    print("Bob is greater than 10")
      </code></pre>
      <p>In this example, the print function will only run if <code>bob</code> is 11 or higher.</p>
      </br>
      <p>One thing to note here is the formatting. Note that after the <code>if bob > 10:</code> there is a colon (:)<p>
      <p>This tells Python that the next line is part of a new block of code.</p>
      <p>In Python, we use indentation to define blocks of code, so the next line must be indented.</p>
      <p>After the <code>else:</code> we also have a colon, and the next line is indented again.</p>
      <p>Try it for yourself:</p>
      <ol>
      <li>Initialize a variable with a value</li>
      <li>Use an <code>if</code> statement to check if the variable is greater or less than a value</li>
      <li>Print a message based on the condition</li>
      </ol>
      <p>To test if two values are equal, you can use the <code>==</code> operator.</p>
      <p>eg. <pre><code>
num = 10
if num == 10:
    print("num is equal to 10")
      </code></pre>
      `,
    objectives: [
      "Initialize a variable with a value",
      "Create an if statement to check a condition", ,
      "Print a message based on the condition",
    ],

    doneCondition: (() => {

      return ({ code, consoleText, codeRanGood }) => {
        const progress = {
          varCreated: false,
          ifStatement: false,
          printedSomething: false,
        };
        if (!codeRanGood) {
          return {
            done: false,
            hint: ""
          };
        }

        // Check for variable assignment
        const assignRegex = /\b(\w+)\s*=\s*[\d'"]/;
        progress.varCreated = assignRegex.test(code);

        // Check for if statement
        progress.ifStatement = /(^|\n)\s*if\s+.*:/.test(code);

        // Check for print() anywhere
        progress.printedSomething = /print\s*\(.*\)/.test(code);

        // Build hint
        const missing = [];
        if (!progress.varCreated) missing.push("create a variable");
        if (!progress.ifStatement) missing.push("use an if statement");
        if (!progress.printedSomething) missing.push("print something");

        let hint = "";
        if (missing.length > 0) {
          hint = "I still need you to " + (missing.length === 1
            ? missing[0]
            : missing.slice(0, -1).join(", ") + " and " + missing[missing.length - 1]);
        }

        const done = progress.varCreated && progress.ifStatement && progress.printedSomething;
        return {
          done,
          progressArray: Object.values(progress),
          hint
        };
      };
    })()

  },
  {
    id: 'lesson7',
    title: '7. More Conditionals',
    difficulty: 'easy',
    content: `
      <p>Sometimes we'll want to run one thing OR another, rather than just running something or not. To do this we chain our if statements together with <code>elif</code> and <code>else</code>.</p>
      <pre><code>
bob = 10
if bob == 10:
    print("bob is equal to 10")
elif bob < 10:
    print("bob is less than 10")
else:
    print("bob is greater than 10")
      </code></pre>
      <p>In this example, only one of the print statements can ever run, <code>elif</code> is short for "else if", and is a second if statement which is only tested it the <code>if</code> above it resolves to False.</p>
      <p>The <code>else</code> statement is run if all previous conditions are False.</p>
      <p>You can chain as many <code>elif</code> statements as you like, but only one <code>else</code> at the end.</p>
      <p>Try it for yourself:</p>
      `,
    objectives: [
      "Initialize a variable with a value",
      "Create an if statement to check a condition", ,
      "Create an elif statement to check another condition",
      "Create an else statement to catch all other conditions",
      "Print a message based on each of the conditions",
    ],
    doneCondition: (() => {

      return ({ code, consoleText, codeRanGood }) => {

        const progress = {
          varCreated: false,
          ifStatement: false,
          elifStatement: false,
          elseStatement: false,
          threeDistinctPrints: false,
        };
        if (!codeRanGood) {
          return { done: false, hint: "" };
        }

        // 1. Variable assignment
        const assignRegex = /\b(\w+)\s*=\s*[\d'"]/;
        progress.varCreated = assignRegex.test(code);

        // 2. Line-by-line block tracking
        const lines = code.split('\n');
        let currentBlock = null;
        const printContents = {
          if: null,
          elif: null,
          else: null,
        };

        for (let i = 0; i < lines.length; i++) {
          const line = lines[i].trim();

          if (/^if\s+.*:/.test(line)) {
            progress.ifStatement = true;
            currentBlock = "if";
            continue;
          }

          if (/^elif\s+.*:/.test(line)) {
            progress.elifStatement = true;
            currentBlock = "elif";
            continue;
          }

          if (/^else\s*:/.test(line)) {
            progress.elseStatement = true;
            currentBlock = "else";
            continue;
          }

          const printMatch = line.match(/print\s*\((.*?)\)/);
          if (printMatch && currentBlock && !printContents[currentBlock]) {
            const cleaned = printMatch[1].replace(/\s+/g, '').toLowerCase();
            printContents[currentBlock] = cleaned;
          }
        }

        const printedValues = Object.values(printContents).filter(Boolean);
        const uniqueValues = new Set(printedValues);
        progress.threeDistinctPrints = uniqueValues.size === 3;

        // Hint generation
        const missing = [];
        if (!progress.varCreated) missing.push("create a variable");
        if (!progress.ifStatement) missing.push("use an if statement");
        if (!progress.elifStatement) missing.push("use an elif statement");
        if (!progress.elseStatement) missing.push("use an else statement");
        if (!progress.threeDistinctPrints) missing.push("print different things in the if, elif, and else blocks");

        const hint = missing.length > 0
          ? "I still need you to " + (missing.length === 1
            ? missing[0]
            : missing.slice(0, -1).join(", ") + " and " + missing[missing.length - 1])
          : "";

        const done = progress.varCreated && progress.ifStatement && progress.elifStatement &&
          progress.elseStatement && progress.threeDistinctPrints;

        return {
          done,
          progressArray: Object.values(progress),
          hint
        };
      };
    })()
  },
  {
    id: 'lesson8',
    title: '8. While Loops',
    difficulty: 'easy',
    content: `
      <p>Most of the time we'll want our code to run multiple times, or even endlessly, in that case we need <strong>loops</strong>.</p>
      <p>Python has two main types of loops: <code>for</code> loops and <code>while</code> loops.</p>
      <p>The <code>while</code> loop will continue to run as long as a condition is True.</p>
      <pre><code>
count = 0
while count < 5:
    print("Count is:", count)
    count = count + 1
print("Done!")
      </code></pre>
      <p>You have to be careful with <code>while</code> loops, if the condition never becomes False, the loop will run forever!</p>

      `,
    objectives: [
      "Create a variable",
      "Create a while loop ",
      "that runs while the value of that variable is less than a number",
      "Print the value of the variable inside the loop",
      "Add one or more to the variable inside the loop",
      "Your loop should end on its own"
    ],

    doneCondition: (() => {
      return ({ code, consoleText, codeRanGood }) => {
        const progress = {
          varCreated: false,
          hasWhileLoop: false,
          whileConditionChecksVar: false,
          printsVarInLoop: false,
          updatesVarInLoop: false,
          codeTerminates: codeRanGood
        };

        if (!codeRanGood) {
          return { done: false, hint: "" };
        }

        // Step 1: Variable assignment (e.g., x = 0)
        const assignRegex = /\b(\w+)\s*=\s*[\d'"]/;
        const match = code.match(assignRegex);
        const varName = match ? match[1] : null;
        progress.varCreated = !!varName;

        const lines = code.split('\n');
        let inWhile = false;

        for (let line of lines) {
          const trimmed = line.trim();

          // Step 2: Detect while loop and condition
          if (/^while\s+(.*):/.test(trimmed)) {
            progress.hasWhileLoop = true;
            const condition = trimmed.match(/^while\s+(.*):/)[1];
            if (varName && condition.includes(varName) && condition.includes('<')) {
              progress.whileConditionChecksVar = true;
            }
            inWhile = true;
            continue;
          }

          // Step 3–4: Check inside loop
          if (inWhile) {
            // Stop tracking if the line is dedented (exits the loop)
            if (/^\S/.test(line)) {
              inWhile = false;
              continue;
            }

            // Step 3: print(varName)
            const printMatch = trimmed.match(/^print\(([^)]+)\)$/);
            if (printMatch) {
              const printedValue = printMatch[1].trim();
              if (printedValue === varName) {
                progress.printsVarInLoop = true;
              }
            }


            // Step 4: update variable (x += 1 or x = x + 1)
            const updateRegex1 = new RegExp(`\\b${varName}\\s*\\+=\\s*\\d+`);
            const updateRegex2 = new RegExp(`\\b${varName}\\s*=\\s*${varName}\\s*\\+\\s*\\d+`);
            if (updateRegex1.test(trimmed) || updateRegex2.test(trimmed)) {
              progress.updatesVarInLoop = true;
            }
          }
        }

        // ✅ Build hint
        const missing = [];
        if (!progress.varCreated) missing.push("create a variable");
        if (!progress.hasWhileLoop) missing.push("add a while loop");
        if (!progress.whileConditionChecksVar) missing.push("make the while loop check if the variable is less than something");
        if (!progress.printsVarInLoop) missing.push("print the variable inside the loop");
        if (!progress.updatesVarInLoop) missing.push("update the variable in the loop");
        if (!progress.codeTerminates) missing.push("make sure the loop ends on its own");

        const hint = missing.length > 0
          ? "I still need you to " + (missing.length === 1
            ? missing[0]
            : missing.slice(0, -1).join(", ") + " and " + missing[missing.length - 1])
          : "";

        const done = Object.values(progress).every(Boolean);

        return {
          done,
          progressArray: Object.values(progress),
          hint
        };
      };
    })()

  },
  {
    id: 'lesson9',
    title: '8. For Loops',
    difficulty: 'easy',
    content: `
      <p>A more common type of loop is the <strong>for</strong> loop.</p>
      <p>A <code>for</code> loop includes the creation of a variable that will be used to count how many times it should run.</p>
      <p>This makes them much safer in most cases, as it's much harder to accidentally create an infinite loop.</p>
      <p>Here's an example:</p>
      <pre><code>
for i in range(5):
    print(i)
print("Done!")
      </code></pre>
      <p>The <code>range(n)</code> function actually creates a list of numbers, and each will be assigned to <code>i</code> in turn.</p>
      <p>You can also add a second number, which will let you set a starting number as well as an ending one.</p>
      <p></p>
      <pre><code>
# Create a for loop that runs from 100 to 150
for i in range(100, 150):
    print(i)
print("Done!")
      </code></pre>
      <p>You can add a third number, which will change how much your loop should iterate by, the default being 1</p>
      <pre><code>
# Create a for loop that runs from 0 to 27, by 3s
for i in range(0, 27, 3):
    print(i)
print("Done!")
      </code></pre>
      `,
    objectives: [
      "Create a loop",
      "The loop should use range() and have all three arguments (start, end, step)",
      "Your loop should end on its own (i.e. not run forever)",
    ],

    doneCondition: (() => {
      return ({ code, consoleText, codeRanGood }) => {
        const progress = {
          forLoopFound: false,
          rangeHas3Args: false,
          codeTerminates: codeRanGood,
        };

        if (!codeRanGood) {
          return { done: false, hint: "" };
        }

        const lines = code.split('\n');
        for (let line of lines) {
          const trimmed = line.trim();

          // Look for a 'for' loop using range()
          const forMatch = trimmed.match(/^for\s+\w+\s+in\s+range\((.*?)\):/);
          if (forMatch) {
            progress.forLoopFound = true;

            const rangeArgs = forMatch[1].split(',').map(s => s.trim());
            if (rangeArgs.length === 3) {
              progress.rangeHas3Args = true;
            }
            break; // Found the loop, no need to keep scanning
          }
        }

        // Hints
        const missing = [];
        if (!progress.forLoopFound) missing.push("write a for loop using range()");
        else if (!progress.rangeHas3Args) missing.push("use start, end, and step in the range()");
        if (!progress.codeTerminates) missing.push("make sure the loop ends on its own");

        const hint = missing.length > 0
          ? "I still need you to " + (missing.length === 1
            ? missing[0]
            : missing.slice(0, -1).join(", ") + " and " + missing[missing.length - 1])
          : "";

        const done = Object.values(progress).every(Boolean);

        return {
          done,
          progressArray: Object.values(progress),
          hint
        };
      };
    })()


  },
  {
    id: 'lesson10',
    title: '9. Libraries & Modules (time)',
    difficulty: 'easy',
    content: `
      <p>A lot of the time we need more code than can fit in a single file, or we want to reuse our own, or someone elses code.</p>
      <p>For that we use <strong>libraries</strong> and <strong>modules</strong>.</p>
      </br>
      <p>As an example, we'll import the "time" module, which lets do things like measure time, which we can use for all sorts of useful things.</p>
      <p>To import a module, we use the <code>import</code> statement:</p>
      <p>eg. <code>import time</code></p>
      </br>
      <p>This effectively runs all the code in that module, and gives us access to all the functions and variables it defines.</p>
      <p>Try this:</p>
      <pre><code>
import time # Import the time module
for i in range(1, 10+1):
    print(i)
    time.sleep(1)  # Wait for 1 second (0.5 for half a second)
print("Done!")
</code></pre>
</br>
<p><strong>Note:</strong> To count from actual 1-10 our <code>range(start, end)</code> starts at 1, and ends at 11, as the <code>end</code> number is exclusive.</p>
      `,
    objectives: [
      "Import the time module",
      "Print something",
      "Use time.sleep() to pause for an amount of time",
      "Print something else after the pause"
    ],

    doneCondition: (() => {
      return ({ code, consoleText, codeRanGood }) => {
        const progress = {
          importedTime: false,
          printedBefore: false,
          usedSleep: false,
          printedAfter: false,
        };

        if (!codeRanGood) {
          return { done: false, hint: "" };
        }

        // 1. Check for "import time"
        const importRegex = /^\s*import\s+time\b/m;
        progress.importedTime = importRegex.test(code);

        // 2. Match all print(...) calls
        const printRegex = /print\s*\(.*?\)/g;
        const printMatches = [...code.matchAll(printRegex)];

        // 3. Match time.sleep(...)
        const sleepRegex = /time\.sleep\s*\(\s*[\d.]+\s*\)/;
        const sleepMatch = sleepRegex.exec(code);
        progress.usedSleep = !!sleepMatch;

        // 4. Handle print position logic
        if (printMatches.length > 0) {
          // If there's no sleep, we just say "they printed something" — early lesson support
          if (!sleepMatch) {
            progress.printedBefore = true; // consider *any* print valid before sleep
          } else {
            const sleepIndex = sleepMatch.index;
            for (const m of printMatches) {
              if (m.index < sleepIndex) progress.printedBefore = true;
              if (m.index > sleepIndex) progress.printedAfter = true;
            }
          }
        }

        // 5. Build hint
        const missing = [];
        if (!progress.importedTime) missing.push("import the time module");
        if (!progress.printedBefore) missing.push("print something before sleeping");
        if (!progress.usedSleep) missing.push("use time.sleep()");
        if (!progress.printedAfter && progress.usedSleep)
          missing.push("print something after sleeping");

        let hint = "";
        if (missing.length === 1) {
          hint = `I still need you to ${missing[0]}`;
        } else if (missing.length > 1) {
          hint = `I still need you to ${missing.slice(0, -1).join(", ")} and ${missing.at(-1)}`;
        }

        return {
          done:
            progress.importedTime &&
            progress.printedBefore &&
            progress.usedSleep &&
            progress.printedAfter,
          progressArray: Object.values(progress),
          hint,
        };
      };
    })()




  },
];