import sqlite3
import time
from typing import Union

import flask

from llm_server import opts
from llm_server.llm.oobabooga.ooba_backend import OobaboogaBackend
from llm_server.llm.vllm.vllm_backend import VLLMBackend
from llm_server.routes.cache import redis
from llm_server.routes.stats import SemaphoreCheckerThread

DEFAULT_PRIORITY = 9999


class RequestHandler:
    def __init__(self, incoming_request: flask.Request):
        self.request_json_body = None
        self.request = incoming_request
        self.start_time = time.time()
        self.client_ip = self.get_client_ip()
        self.token = self.request.headers.get('X-Api-Key')
        self.priority = self.get_priority()
        self.backend = get_backend()
        self.parameters = self.parameters_invalid_msg = None
        self.used = False
        SemaphoreCheckerThread.recent_prompters[self.client_ip] = time.time()

    def get_client_ip(self):
        if self.request.headers.get('cf-connecting-ip'):
            return self.request.headers.get('cf-connecting-ip')
        elif self.request.headers.get('x-forwarded-for'):
            return self.request.headers.get('x-forwarded-for').split(',')[0]
        else:
            return self.request.remote_addr

    def get_priority(self):
        if self.token:
            conn = sqlite3.connect(opts.database_path)
            cursor = conn.cursor()
            cursor.execute("SELECT priority FROM token_auth WHERE token = ?", (self.token,))
            result = cursor.fetchone()
            conn.close()
            if result:
                return result[0]
        return DEFAULT_PRIORITY

    def load_parameters(self):
        # Handle OpenAI
        if self.request_json_body.get('max_tokens'):
            self.request_json_body['max_new_tokens'] = self.request_json_body.pop('max_tokens')
        self.parameters, self.parameters_invalid_msg = self.backend.get_parameters(self.request_json_body)

    def validate_request(self):
        self.load_parameters()
        params_valid = False
        request_valid = False
        invalid_request_err_msg = None
        if self.parameters:
            params_valid = True
            request_valid, invalid_request_err_msg = self.backend.validate_request(self.parameters)
        return (params_valid, self.parameters_invalid_msg), (request_valid, invalid_request_err_msg)

    def is_client_ratelimited(self):
        queued_ip_count = redis.get_dict('queued_ip_count').get(self.client_ip, 0) + redis.get_dict('processing_ips').get(self.client_ip, 0)
        if queued_ip_count < opts.simultaneous_requests_per_ip or self.priority == 0:
            return False
        else:
            return True

    def handle_request(self):
        raise NotImplementedError

    def handle_ratelimited(self):
        raise NotImplementedError


def get_backend():
    if opts.mode == 'oobabooga':
        return OobaboogaBackend()
    elif opts.mode == 'vllm':
        return VLLMBackend()
    else:
        raise Exception


def delete_dict_key(d: dict, k: Union[str, list]):
    if isinstance(k, str):
        if k in d.keys():
            del d[k]
    elif isinstance(k, list):
        for item in k:
            if item in d.keys():
                del d[item]
    else:
        raise ValueError
    return d