# Let us check if Git is installed on your system
import os
result = os.system('git --version')
print('If you see a version above, Git is installed!')

# Let us create a folder for your Git project
import os
folder_name = "my_first_git_project"
if not os.path.exists(folder_name):
    os.mkdir(folder_name)
print(f'Folder "{folder_name}" is ready!')

# Make a simple Python file in your new folder
file_path = os.path.join(folder_name, "greeting.py")
with open(file_path, "w") as f:
    f.write("print(\"Hello, Git!\")\n")
print(f'File created at {file_path}')

# Initialize Git in your project folder
init_result = os.system(f'cd {folder_name} && git init')
print('Your folder is now a Git repository!')

# Check the status of your new repository
os.system(f'cd {folder_name} && git status')

# Stage your new file with git add
os.system(f'cd {folder_name} && git add greeting.py')
print('File is staged and ready to commit.')

# Commit your staged file with a message
os.system(f'cd {folder_name} && git commit -m "Add greeting.py"')
print('First commit is saved. Congratulations!')

# Make a small edit and see Git notice the change
with open(file_path, "a") as f:
    f.write("print(\"Update: Welcome to Git!\")\n")
print('We changed greeting.py. Check git status to see!')

# What files has Git noticed as changed?
os.system(f'cd {folder_name} && git status')

# See your project's commit history
os.system(f'cd {folder_name} && git log --oneline')

# Discard your last edit in greeting.py
os.system(f'cd {folder_name} && git checkout -- greeting.py')
print('Your file is reset to the last commit!')

# Create a .gitignore to skip files you do not want to track
gitignore_path = os.path.join(folder_name, ".gitignore")
with open(gitignore_path, "w") as f:
    f.write("*.log\n__pycache__/\n")
os.system(f'cd {folder_name} && git add .gitignore && git commit -m "Add .gitignore"')
print('.gitignore is now set up!')

# Add a remote GitHub repository
github_url = input('Paste your GitHub repo URL here: ')
os.system(f'cd {folder_name} && git remote add origin {github_url}')
print('Remote added! Now your code can reach GitHub.')

# Push your code to GitHub
os.system(f'cd {folder_name} && git branch -M main && git push -u origin main')
print('Code sent to GitHub!')

# Clone a GitHub repo to your computer
clone_url = input('Enter a repo URL to clone: ')
os.system(f'git clone {clone_url}')
print('Repository cloned!')

# See a summary of recent changes from GitHub
os.system(f'cd {folder_name} && git pull')

# Who made which changes? Run git log with author
os.system(f'cd {folder_name} && git log --oneline --author=')

# Mini-project: Make a changelog.txt and save updates over time
changelog_path = os.path.join(folder_name, "changelog.txt")
with open(changelog_path, "a") as log:
    update = input('Describe your latest project change (e.g., Fixed a bug): ')
    log.write(update + "\n")
os.system(f'cd {folder_name} && git add changelog.txt && git commit -m "Update changelog.txt"')
print('Changelog updated and saved to GitHub!')

# Mini-project part 2: Branches for experiments
os.system(f'cd {folder_name} && git checkout -b experimental-feature')
with open(file_path, "a") as f:
    f.write("print(\"Experimental feature!\")\n")
os.system(f'cd {folder_name} && git add greeting.py && git commit -m "Try experimental feature"')
print('Experimental feature added on a new branch!')

# Merge your branch changes back into main
os.system(f'cd {folder_name} && git checkout main && git merge experimental-feature')
print('Experimental feature merged to main!')

# See a simple commit graph with git log --graph
os.system(f'cd {folder_name} && git log --oneline --graph')

# Clean up: Remove a file and save that change
os.remove(file_path)
os.system(f'cd {folder_name} && git rm greeting.py && git commit -m "Remove greeting.py"')
print('greeting.py removed from your project and version history!')

# Top 3 mistakes beginners make with Git
mistakes = [
    'Forgetting to add and commit often',
    'Not writing clear commit messages',
    'Losing track of which branch you are on'
]
for m in mistakes:
    print('- ' + m)
    

# Git tip: Use git diff to see exactly what you changed
os.system(f'cd {folder_name} && git diff')

# Challenge: Make a project with at least 3 commits
print('Challenge: Make a Python repo, add a file, commit, update it, and commit again.')