import sqlite3
import time

from flask import jsonify, request

from llm_server.routes.stats import SemaphoreCheckerThread
from . import bp
from ..cache import redis
from ..helpers.client import format_sillytavern_err
from ..helpers.http import validate_json
from ..queue import priority_queue
from ... import opts
from ...database import log_prompt
from ...helpers import safe_list_get

DEFAULT_PRIORITY = 9999


@bp.route('/generate', methods=['POST'])
def generate():
    start_time = time.time()
    request_valid_json, request_json_body = validate_json(request.data)
    if not request_valid_json:
        return jsonify({'code': 400, 'error': 'Invalid JSON'}), 400

    if request.headers.get('cf-connecting-ip'):
        client_ip = request.headers.get('cf-connecting-ip')
    elif request.headers.get('x-forwarded-for'):
        client_ip = request.headers.get('x-forwarded-for')
    else:
        client_ip = request.remote_addr

    SemaphoreCheckerThread.recent_prompters[client_ip] = time.time()

    parameters = request_json_body.copy()
    del parameters['prompt']

    token = request.headers.get('X-Api-Key')
    priority = None
    if token:
        conn = sqlite3.connect(opts.database_path)
        cursor = conn.cursor()
        cursor.execute("SELECT priority FROM token_auth WHERE token = ?", (token,))
        result = cursor.fetchone()
        if result:
            priority = result[0]
        conn.close()

    if priority is None:
        priority = DEFAULT_PRIORITY
    else:
        print(f'Token {token} was given priority {priority}.')

    # success, response, error_msg = generator(request_json_body)
    event = priority_queue.put((request_json_body, client_ip, token, parameters), priority)
    event.wait()
    success, response, error_msg = event.data

    # Add the elapsed time to a global list
    end_time = time.time()
    elapsed_time = end_time - start_time
    # print('elapsed:', elapsed_time)
    with wait_in_queue_elapsed_lock:
        wait_in_queue_elapsed.append((end_time, elapsed_time))

    if not success:
        if opts.mode == 'oobabooga':
            backend_response = format_sillytavern_err(f'Failed to reach the backend ({opts.mode}): {error_msg}', 'error')
            response_json_body = {
                'results': [
                    {
                        'text': backend_response,
                    }
                ],
            }
        else:
            raise Exception

        log_prompt(client_ip, token, request_json_body['prompt'], backend_response, elapsed_time, parameters, dict(request.headers), response.status_code)
        return jsonify({
            'code': 500,
            'error': 'failed to reach backend',
            **response_json_body
        }), 200
    response_valid_json, response_json_body = validate_json(response)
    if response_valid_json:
        redis.incr('proompts')
        backend_response = safe_list_get(response_json_body.get('results', []), 0, {}).get('text')
        if not backend_response:
            if opts.mode == 'oobabooga':
                backend_response = format_sillytavern_err(
                    f'Backend (oobabooga) returned an empty string. This can happen when your parameters are incorrect. Make sure your context size is no greater than {opts.context_size}. Furthermore, oobabooga does not support concurrent requests so all users have to wait in line and the backend server may have glitched for a moment. Please try again.',
                    'error')
                response_json_body['results'][0]['text'] = backend_response
            else:
                raise Exception

        log_prompt(client_ip, token, request_json_body['prompt'], backend_response, elapsed_time, parameters, dict(request.headers), response.status_code)
        return jsonify({
            **response_json_body
        }), 200
    else:
        if opts.mode == 'oobabooga':
            backend_response = format_sillytavern_err(f'The backend did not return valid JSON.', 'error')
            response_json_body = {
                'results': [
                    {
                        'text': backend_response,
                    }
                ],
            }
        else:
            raise Exception
        log_prompt(client_ip, token, request_json_body['prompt'], backend_response, elapsed_time, parameters, dict(request.headers), response.status_code)
        return jsonify({
            'code': 500,
            'error': 'the backend did not return valid JSON',
            **response_json_body
        }), 200