import json
import random

# ==========================
#  CODING & DEVELOPER DATA CREATOR
# ==========================

coding_examples = [
    ("Write a Python function to reverse a string.",
     "def reverse_string(s):\n    return s[::-1]"),

    ("Explain what a class is in Python.",
     "A class is a blueprint for creating objects. It defines attributes and methods that its objects will have."),

    ("Fix this Python error: TypeError: 'int' object is not iterable.",
     "You are likely trying to loop over an integer. Use range() or convert it to an iterable."),

    ("Write a JavaScript function to check if a number is even.",
     "function isEven(num) {\n  return num % 2 === 0;\n}"),

    ("Explain how async/await works in JavaScript.",
     "Async/await allows asynchronous code to be written in a synchronous style using Promises under the hood."),

    ("Write a simple React component that shows 'Hello World'.",
     "function HelloWorld() {\n  return <h1>Hello World</h1>;\n}\nexport default HelloWorld;"),

    ("Explain what Big O notation is.",
     "Big O notation describes how the runtime or space requirements of an algorithm grow relative to the input size."),

    ("Create a function in C++ that returns the factorial of a number.",
     "int factorial(int n) {\n    return (n <= 1) ? 1 : n * factorial(n - 1);\n}"),

    ("Explain what an API is.",
     "An API (Application Programming Interface) allows two systems to communicate by exposing data or functions programmatically."),

    ("Write a SQL query to select all users older than 25.",
     "SELECT * FROM users WHERE age > 25;"),

    ("Explain what recursion is.",
     "Recursion is when a function calls itself to solve smaller instances of a problem."),

    ("Write a Python program to check if a string is a palindrome.",
     "def is_palindrome(s):\n    s = s.lower().replace(' ', '')\n    return s == s[::-1]"),

    ("Explain what a REST API is.",
     "A REST API uses HTTP methods (GET, POST, PUT, DELETE) to manage resources identified by URLs."),

    ("Write a JavaScript program to fetch data from an API.",
     "fetch('https://api.example.com/data')\n  .then(res => res.json())\n  .then(data => console.log(data));"),

    ("Explain the difference between == and === in JavaScript.",
     "== compares values with type coercion, while === compares both value and type."),

    ("Write a Python decorator that logs function calls.",
     "def log_calls(func):\n    def wrapper(*args, **kwargs):\n        print(f'Calling {func.__name__}')\n        return func(*args, **kwargs)\n    return wrapper"),

    ("Explain what machine learning is.",
     "Machine learning is a branch of AI where algorithms learn patterns from data to make predictions or decisions without being explicitly programmed."),

    ("Write a Python list comprehension to get squares of numbers from 1 to 10.",
     "[x**2 for x in range(1, 11)]"),

    ("Explain the difference between list and tuple in Python.",
     "A list is mutable (can be changed), while a tuple is immutable (cannot be changed)."),

    ("Explain how Git works.",
     "Git is a version control system that tracks changes in code and allows collaboration through commits and branches.")
]

# ==========================
#  GENERATE EXTENDED DATASET
# ==========================

dataset = []
for _ in range(1000):  # Generate 1000 examples
    instruction, response = random.choice(coding_examples)
    dataset.append({
        "category": "coding",
        "instruction": instruction,
        "response": response
    })

# ==========================
#  SAVE TO JSONL
# ==========================

output_file = "coding_ai_dataset.jsonl"
with open(output_file, "w", encoding="utf-8") as f:
    for ex in dataset:
        f.write(json.dumps(ex, ensure_ascii=False) + "\n")

print(f"✅ Created {len(dataset)} coding & dev examples.")
print(f"📄 Saved as {output_file}")