API ভার্সনিং স্ট্র্যাটেজি

users_db = {
    1: {"id": 1, "full_name": "Rahim Uddin", "email": "rahim@example.com", "joined_year": 2023},
}

def render_v1(user):
    """v1 শেপ -- আদি ফিল্ড নাম full_name বজায় রাখে"""
    return {"id": user["id"], "full_name": user["full_name"], "email": user["email"]}

def render_v2(user):
    """v2 শেপ -- full_name কে name-এ পাল্টানো হয়েছে, joined_year যোগ হয়েছে"""
    return {
        "id": user["id"],
        "name": user["full_name"],
        "email": user["email"],
        "joined_year": user["joined_year"],
    }

# --- পদ্ধতি ১: URL-path ভিত্তিক ভার্সনিং ---
class PathVersionedRouter:
    def __init__(self):
        self.routes = {}

    def route(self, path):
        def decorator(fn):
            self.routes[path] = fn
            return fn
        return decorator

    def dispatch(self, path):
        handler = self.routes.get(path)
        if handler is None:
            return 404, {"error": "Not Found"}
        return 200, handler()

path_app = PathVersionedRouter()

@path_app.route('/v1/users/1')
def get_user_v1():
    return render_v1(users_db[1])

@path_app.route('/v2/users/1')
def get_user_v2():
    return render_v2(users_db[1])

status_v1_path, body_v1_path = path_app.dispatch('/v1/users/1')
status_v2_path, body_v2_path = path_app.dispatch('/v2/users/1')

# --- পদ্ধতি ২: header ভিত্তিক ভার্সনিং, একই পাথ ---
class HeaderVersionedRouter:
    def __init__(self):
        self.routes = {}

    def route(self, path):
        def decorator(fn):
            self.routes[path] = fn
            return fn
        return decorator

    def dispatch(self, path, headers):
        handler = self.routes.get(path)
        if handler is None:
            return 404, {"error": "Not Found"}
        version = headers.get("Accept-Version", "v1")
        return 200, handler(version)

header_app = HeaderVersionedRouter()

@header_app.route('/users/1')
def get_user(version):
    if version == "v2":
        return render_v2(users_db[1])
    return render_v1(users_db[1])

status_v1_header, body_v1_header = header_app.dispatch('/users/1', {"Accept-Version": "v1"})
status_v2_header, body_v2_header = header_app.dispatch('/users/1', {"Accept-Version": "v2"})

print("== URL-path ভিত্তিক ভার্সনিং ==")
print(f"GET /v1/users/1               -> {status_v1_path} {body_v1_path}")
print(f"GET /v2/users/1               -> {status_v2_path} {body_v2_path}")

print("\n== Header ভিত্তিক ভার্সনিং (একই পাথ /users/1) ==")
print(f"GET /users/1, Accept-Version: v1 -> {status_v1_header} {body_v1_header}")
print(f"GET /users/1, Accept-Version: v2 -> {status_v2_header} {body_v2_header}")

print(f"\nযাচাই -- দুই পদ্ধতির v1 রেসপন্স শেপ অভিন্ন: {body_v1_path == body_v1_header}")
print(f"যাচাই -- দুই পদ্ধতির v2 রেসপন্স শেপ অভিন্ন: {body_v2_path == body_v2_header}")
print(f"যাচাই -- v1-এ 'full_name' আছে ও v2-তে নেই: {'full_name' in body_v1_path and 'full_name' not in body_v2_path}")
print(f"যাচাই -- v2-এ 'name' আছে ও v1-এ নেই: {'name' in body_v2_path and 'name' not in body_v1_path}")