import { CheckCircleOutlined, CloseCircleOutlined } from '@ant-design/icons'
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
import { Alert, Button, Card, Form, Input, Space, Spin, Typography } from 'antd'
import { useState } from 'react'
import { useNavigate } from 'react-router-dom'

import llmApi from '../../api/llm'
import settingsApi from '../../api/settings'

const { Title, Text } = Typography

const API_KEY = 'deepseek_api_key'

export default function Settings() {
  const navigate = useNavigate()
  const queryClient = useQueryClient()
  const [checkResult, setCheckResult] = useState<{ ok: boolean; message: string } | null>(null)

  const { data: setting, isLoading } = useQuery({
    queryKey: ['settings', API_KEY],
    queryFn: () => settingsApi.get(API_KEY),
  })

  const saveMutation = useMutation({
    mutationFn: (value: string) => settingsApi.update(API_KEY, value || null),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['settings', API_KEY] })
      setCheckResult(null)
    },
  })

  const checkMutation = useMutation({
    mutationFn: () => llmApi.check(),
    onSuccess: (data) => setCheckResult(data),
  })

  const handleSave = (values: { api_key: string }) => {
    saveMutation.mutate(values.api_key)
  }

  if (isLoading) {
    return (
      <div style={{ display: 'flex', justifyContent: 'center', padding: 80 }}>
        <Spin size="large" />
      </div>
    )
  }

  return (
    <div style={{ maxWidth: 600, margin: '40px auto', padding: '0 24px' }}>
      <Title level={2}>Настройки</Title>

      <Card title="AI-помощник (DeepSeek)">
        <Text type="secondary" style={{ display: 'block', marginBottom: 16 }}>
          Введите API ключ DeepSeek для активации AI-функций при создании и редактировании
          тестов. Ключ хранится только на сервере.
        </Text>

        <Form layout="vertical" onFinish={handleSave} initialValues={{ api_key: setting?.value ?? '' }}>
          <Form.Item
            name="api_key"
            label="API ключ DeepSeek"
          >
            <Input.Password
              placeholder="sk-..."
              visibilityToggle
              style={{ fontFamily: 'monospace' }}
            />
          </Form.Item>

          <Form.Item style={{ marginBottom: 0 }}>
            <Space wrap>
              <Button
                type="primary"
                htmlType="submit"
                loading={saveMutation.isPending}
              >
                Сохранить
              </Button>
              <Button
                onClick={() => checkMutation.mutate()}
                loading={checkMutation.isPending}
                disabled={!setting?.value}
              >
                Проверить подключение
              </Button>
              <Button onClick={() => navigate('/')}>
                На главную
              </Button>
            </Space>
          </Form.Item>
        </Form>

        {saveMutation.isSuccess && (
          <Alert
            type="success"
            message="Ключ сохранён"
            showIcon
            style={{ marginTop: 16 }}
            closable
          />
        )}

        {checkResult && (
          <Alert
            type={checkResult.ok ? 'success' : 'error'}
            message={checkResult.message}
            icon={
              checkResult.ok ? (
                <CheckCircleOutlined />
              ) : (
                <CloseCircleOutlined />
              )
            }
            showIcon
            style={{ marginTop: 16 }}
            closable
            onClose={() => setCheckResult(null)}
          />
        )}
      </Card>
    </div>
  )
}