import time

from flask import jsonify

from llm_server import opts
from llm_server.database import log_prompt
from llm_server.routes.helpers.client import format_sillytavern_err
from llm_server.routes.helpers.http import validate_json
from llm_server.routes.queue import priority_queue
from llm_server.routes.request_handler import RequestHandler


class OobaRequestHandler(RequestHandler):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    def handle_request(self):
        if self.used:
            raise Exception

        request_valid_json, self.request_json_body = validate_json(self.request)
        if not request_valid_json:
            return jsonify({'code': 400, 'msg': 'Invalid JSON'}), 400

        params_valid, request_valid = self.validate_request()
        if not request_valid[0] or not params_valid[0]:
            error_messages = [msg for valid, msg in [request_valid, params_valid] if not valid and msg]
            combined_error_message = ', '.join(error_messages)
            err = format_sillytavern_err(f'Validation Error: {combined_error_message}.', 'error')
            log_prompt(self.client_ip, self.token, self.request_json_body.get('prompt', ''), err, 0, self.parameters, dict(self.request.headers), 0, self.request.url, is_error=True)
            # TODO: add a method to LLMBackend to return a formatted response string, since we have both Ooba and OpenAI response types
            return jsonify({
                'code': 400,
                'msg': 'parameter validation error',
                'results': [{'text': err}]
            }), 200

        # Reconstruct the request JSON with the validated parameters and prompt.
        prompt = self.request_json_body.get('prompt', '')
        llm_request = {**self.parameters, 'prompt': prompt}

        if not self.is_client_ratelimited():
            event = priority_queue.put((llm_request, self.client_ip, self.token, self.parameters), self.priority)
        else:
            event = None

        if not event:
            return self.handle_ratelimited()

        event.wait()
        success, response, error_msg = event.data

        end_time = time.time()
        elapsed_time = end_time - self.start_time

        self.used = True
        return self.backend.handle_response(success, self.request, response, error_msg, self.client_ip, self.token, prompt, elapsed_time, self.parameters, dict(self.request.headers))

    def handle_ratelimited(self):
        backend_response = format_sillytavern_err(f'Ratelimited: you are only allowed to have {opts.simultaneous_requests_per_ip} simultaneous requests at a time. Please complete your other requests before sending another.', 'error')
        log_prompt(self.client_ip, self.token, self.request_json_body.get('prompt', ''), backend_response, None, self.parameters, dict(self.request.headers), 429, self.request.url, is_error=True)
        return jsonify({
            'results': [{'text': backend_response}]
        }), 200