import json
import random
import string
import time
from typing import Any

from flask import Flask, request
from flask_cors import CORS

from g4f import ChatCompletion

app = Flask(__name__)
CORS(app)


@app.route("/chat/completions", methods=["POST"])
def chat_completions():
    model = request.get_json().get("model", "gpt-3.5-turbo")
    stream = request.get_json().get("stream", False)
    messages = request.get_json().get("messages")

    response = ChatCompletion.create(model=model, stream=stream, messages=messages)

    completion_id = "".join(random.choices(string.ascii_letters + string.digits, k=28))
    completion_timestamp = int(time.time())

    if not stream:
        return {
            "id": f"chatcmpl-{completion_id}",
            "object": "chat.completion",
            "created": completion_timestamp,
            "model": model,
            "choices": [
                {
                    "index": 0,
                    "message": {
                        "role": "assistant",
                        "content": response,
                    },
                    "finish_reason": "stop",
                }
            ],
            "usage": {
                "prompt_tokens": None,
                "completion_tokens": None,
                "total_tokens": None,
            },
        }

    def streaming():
        for chunk in response:
            completion_data = {
                "id": f"chatcmpl-{completion_id}",
                "object": "chat.completion.chunk",
                "created": completion_timestamp,
                "model": model,
                "choices": [
                    {
                        "index": 0,
                        "delta": {
                            "content": chunk,
                        },
                        "finish_reason": None,
                    }
                ],
            }

            content = json.dumps(completion_data, separators=(",", ":"))
            yield f"data: {content}\n\n"
            time.sleep(0.1)

        end_completion_data: dict[str, Any] = {
            "id": f"chatcmpl-{completion_id}",
            "object": "chat.completion.chunk",
            "created": completion_timestamp,
            "model": model,
            "choices": [
                {
                    "index": 0,
                    "delta": {},
                    "finish_reason": "stop",
                }
            ],
        }
        content = json.dumps(end_completion_data, separators=(",", ":"))
        yield f"data: {content}\n\n"

    return app.response_class(streaming(), mimetype="text/event-stream")


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=1337, debug=True)