Git Flow ব্রাঞ্চিং স্ট্র্যাটেজি

# Git Flow সিমুলেশন -- L30/L34/L37-এর ঠিক একই Repo মডেলের ওপর ভিত্তি করে।

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

def _new_hash(repo):
    return f"c{len(repo['commits']) + 1}"

def current_commit(repo):
    if repo["head"] in repo["branches"]:
        return repo["branches"][repo["head"]]
    return repo["head"]

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

def git_commit(repo, message):
    parent = current_commit(repo)
    h = _new_hash(repo)
    repo["commits"][h] = {"message": message, "snapshot": dict(repo["staging_area"]), "parent": parent}
    repo["branches"][repo["head"]] = h
    repo["staging_area"] = {}
    return h

def is_ancestor(repo, ancestor_hash, descendant_hash):
    current = descendant_hash
    while current is not None:
        if current == ancestor_hash:
            return True
        current = repo["commits"][current]["parent"]
    return False

def merge_into(repo, source_branch, target_branch):
    source_tip = repo["branches"][source_branch]
    target_tip = repo["branches"][target_branch]
    if target_tip is None or is_ancestor(repo, target_tip, source_tip):
        repo["branches"][target_branch] = source_tip
        return "fast-forward"
    if is_ancestor(repo, source_tip, target_tip):
        return "already-up-to-date"
    h = _new_hash(repo)
    repo["commits"][h] = {
        "message": f"Merge {source_branch} into {target_branch}",
        "snapshot": dict(repo["commits"][source_tip]["snapshot"]),
        "parent": target_tip,
        "parents": [target_tip, source_tip],
    }
    repo["branches"][target_branch] = h
    return "merge-commit"

def commit_on(repo, branch, message, files):
    repo["head"] = branch
    for name, content in files.items():
        repo["working_directory"][name] = content
        git_add(repo, name)
    return git_commit(repo, message)

def start_feature(repo, name):
    branch = f"feature/{name}"
    repo["branches"][branch] = repo["branches"]["develop"]
    return branch

def finish_feature(repo, name):
    branch = f"feature/{name}"
    result = merge_into(repo, branch, "develop")
    del repo["branches"][branch]
    return result

def start_release(repo, version):
    branch = f"release/{version}"
    repo["branches"][branch] = repo["branches"]["develop"]
    return branch

def finish_release(repo, version):
    branch = f"release/{version}"
    r1 = merge_into(repo, branch, "main")
    r2 = merge_into(repo, branch, "develop")
    del repo["branches"][branch]
    return r1, r2

def log_branch(repo, branch):
    messages = []
    current = repo["branches"][branch]
    while current is not None:
        messages.append(repo["commits"][current]["message"])
        current = repo["commits"][current]["parent"]
    return list(reversed(messages))


repo = make_repo()
repo["branches"]["develop"] = None

commit_on(repo, "main", "প্রজেক্ট শুরু", {"app.py": "v0"})
repo["branches"]["develop"] = repo["branches"]["main"]

start_feature(repo, "login")
commit_on(repo, "feature/login", "লগইন ফিচার যোগ", {"login.py": "v1"})
print("feature/login শেষ:", finish_feature(repo, "login"))

start_feature(repo, "signup")
commit_on(repo, "feature/signup", "সাইনআপ ফিচার যোগ", {"signup.py": "v1"})
print("feature/signup শেষ:", finish_feature(repo, "signup"))

start_release(repo, "1.0")
commit_on(repo, "release/1.0", "রিলিজ ১.০-এর জন্য ভার্সন বাম্প", {"VERSION": "1.0"})
print("release/1.0 শেষ (main, develop):", finish_release(repo, "1.0"))

print("\nচূড়ান্ত ব্রাঞ্চ পয়েন্টার:")
for b, tip in repo["branches"].items():
    print(f"  {b:16s} -> {tip}")

print("\nmain-এর কমিট হিস্ট্রি (পুরনো -> নতুন):")
for m in log_branch(repo, "main"):
    print("  -", m)

print("\ndevelop-এর কমিট হিস্ট্রি (পুরনো -> নতুন):")
for m in log_branch(repo, "develop"):
    print("  -", m)

main_has_both_features = (
    "লগইন ফিচার যোগ" in log_branch(repo, "main")
    and "সাইনআপ ফিচার যোগ" in log_branch(repo, "main")
)
develop_has_release_bump = "রিলিজ ১.০-এর জন্য ভার্সন বাম্প" in log_branch(repo, "develop")

print("\nmain-এ কি দুটো ফিচারই পৌঁছেছে?", main_has_both_features)
print("develop কি রিলিজের ভার্সন-বাম্প commit-ও পেয়েছে?", develop_has_release_bump)