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, indefinite_article

DEFAULT_PRIORITY = 9999


# TODO: clean this up and make the ooba vs hf-textgen more object-oriented

@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').split(',')[0]
    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}.')

    queued_ip_count = redis.get_dict('queued_ip_count').get(client_ip, 0) + redis.get_dict('processing_ips').get(client_ip, 0)
    if queued_ip_count < opts.ip_in_queue_max or priority == 0:
        event = priority_queue.put((request_json_body, client_ip, token, parameters), priority)
    else:
        event = None
    if not event:
        backend_response = format_sillytavern_err(f'Ratelimited: you are only allowed to have {opts.ip_in_queue_max} simultaneous requests at a time. Please complete your other requests before sending another.', 'error')
        response_json_body = {
            'results': [
                {
                    'text': backend_response,
                }
            ],
        }
        log_prompt(client_ip, token, request_json_body['prompt'], backend_response, None, parameters, dict(request.headers), 429, is_error=True)
        return jsonify({
            **response_json_body
        }), 200

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

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

    # Be extra careful when getting attributes from the response object
    try:
        response_status_code = response.status_code
    except:
        response_status_code = 0

    # TODO: why is this if block sitting here
    if (not success or not response) and opts.mode == 'oobabooga':
        # Ooba doesn't return any error messages
        backend_response = format_sillytavern_err(f'Failed to reach the backend ({opts.mode}): {error_msg}', 'error')
        response_json_body = {
            'results': [
                {
                    'text': backend_response,
                }
            ],
        }
        log_prompt(client_ip, token, request_json_body['prompt'], backend_response, None, parameters, dict(request.headers), response if response else 0, is_error=True)
        return jsonify({
            'code': 500,
            'error': 'failed to reach backend',
            **response_json_body
        }), 200
    response_valid_json, response_json_body = validate_json(response)
    backend_err = False

    # Return the result to the client
    if response_valid_json:
        if opts.mode == 'oobabooga':
            backend_response = safe_list_get(response_json_body.get('results', []), 0, {}).get('text')
            if not backend_response:
                backend_err = True
                backend_response = format_sillytavern_err(
                    f'Backend (oobabooga) returned an empty string. This is usually due to an error on the backend during inference. Please check your parameters and try again.',
                    'error')
                response_json_body['results'][0]['text'] = backend_response
        elif opts.mode == 'hf-textgen':
            backend_response = response_json_body.get('generated_text', '')
            if response_json_body.get('error'):
                backend_err = True
                error_type = response_json_body.get('error_type')
                error_type_string = 'returned an error' if opts.mode == 'oobabooga' else f'returned {indefinite_article(error_type)} {error_type} error'
                backend_response = format_sillytavern_err(
                    f'Backend ({opts.mode}) {error_type_string}: {response_json_body.get("error")}',
                    f'HTTP CODE {response_status_code}')
                response_json_body = {
                    'results': [
                        {
                            'text': backend_response
                        }
                    ]
                }
            else:
                response_json_body = {
                    'results': [
                        {
                            'text': backend_response
                        }
                    ]
                }
        else:
            raise Exception
        if not backend_err:
            redis.incr('proompts')

        log_prompt(client_ip, token, request_json_body['prompt'], backend_response, elapsed_time if not backend_err else None, parameters, dict(request.headers), response_status_code, response_json_body.get('details', {}).get('generated_tokens'), is_error=backend_err)
        return jsonify({
            **response_json_body
        }), 200

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