.gitignore ও git config

# git-এর থ্রি-ট্রি মডেল (L30-L31 রিইউজ, হুবহু একই) + .gitignore -- এই স্যান্ডবক্সে real git নেই,
# তাই এটি git-এর অভ্যন্তরীণ আচরণের একটি বিশ্বস্ত সিমুলেশন, real git চালানো নয়।

def make_repo():
    return {"working_directory": {}, "staging_area": {}, "commits": {}, "head": None}

def git_add(repo, filename):
    repo["staging_area"][filename] = repo["working_directory"][filename]

def git_commit(repo, message):
    commit_hash = f"c{len(repo['commits']) + 1}"
    snapshot = dict(repo["staging_area"])
    repo["commits"][commit_hash] = {"message": message, "snapshot": snapshot, "parent": repo["head"]}
    repo["head"] = commit_hash
    repo["staging_area"] = {}   # বাস্তব git-এর মতোই কমিটের পর staging area খালি হয়ে যায় (L30 রিইউজ)
    return commit_hash


# ---- .gitignore প্যাটার্ন ম্যাচিং -- একদম শুরু থেকে, fnmatch/re ছাড়াই ----
def matches_gitignore_pattern(filename, pattern):
    if pattern.endswith("/"):
        dirname = pattern[:-1]
        return filename == dirname or filename.startswith(dirname + "/")
    if pattern.startswith("*"):
        suffix = pattern[1:]
        return filename.endswith(suffix)
    return filename == pattern

def is_ignored(filename, gitignore_patterns):
    for pattern in gitignore_patterns:
        if matches_gitignore_pattern(filename, pattern):
            return True
    return False


# ---- git status, .gitignore সচেতন (L31-এর git_status-এর হুবহু একই কাঠামো, gitignore যোগ করে) ----
def git_status(repo, gitignore_patterns=None):
    gitignore_patterns = gitignore_patterns or []
    committed = repo["commits"][repo["head"]]["snapshot"] if repo["head"] else {}
    all_files = set(repo["working_directory"]) | set(repo["staging_area"]) | set(committed)
    status = {}
    for f in sorted(all_files):
        wd = repo["working_directory"].get(f)
        staged = repo["staging_area"].get(f)
        head = committed.get(f)
        if f not in repo["staging_area"] and f not in committed:
            if is_ignored(f, gitignore_patterns):
                continue  # গিটইগনোর করা + কখনো ট্র্যাক হয়নি -- status-এ একেবারেই দেখানো হয় না
            status[f] = "untracked"
        elif wd != staged:
            status[f] = "modified (not staged)"
        elif staged != head:
            status[f] = "staged"
        else:
            status[f] = "no changes"
    return status


# ---- ডেমো ----
repo = make_repo()
repo["working_directory"]["app.py"] = "print('hello world')"
git_add(repo, "app.py")
git_commit(repo, "প্রাথমিক কমিট: app.py যোগ করা হলো")

# app.py-তে working directory-তে আরেকটি পরিবর্তন হলো, কিন্তু staged হয়নি
repo["working_directory"]["app.py"] = "print('hello world!!')"
# তিনটি নতুন ফাইল, কখনো git add করা হয়নি
repo["working_directory"]["debug.log"] = "2026-08-02 ডিবাগ লগ..."
repo["working_directory"][".env"] = "API_KEY=super-secret-123"
repo["working_directory"]["node_modules/react.js"] = "// third-party bundle"

gitignore_patterns = ["*.log", "node_modules/", ".env"]

print("--- .gitignore প্যাটার্ন পরীক্ষা ---")
for f in ["debug.log", ".env", "node_modules/react.js", "app.py"]:
    print(f"  {f:26s} ignored? {is_ignored(f, gitignore_patterns)}")

print("\n--- git status (.gitignore ছাড়া) ---")
for f, s in git_status(repo).items():
    print(f"  {f}: {s}")

print("\n--- git status (.gitignore সহ) ---")
for f, s in git_status(repo, gitignore_patterns).items():
    print(f"  {f}: {s}")