import {
  Alert,
  Button,
  Checkbox,
  Col,
  Descriptions,
  Form,
  Input,
  InputNumber,
  Modal,
  Row,
  Select,
  Space,
  Switch,
  Table,
  Tag,
  Tooltip,
  Typography,
  message,
} from 'antd';
import {
  Bot,
  CirclePlus,
  KeyRound,
  Pencil,
  PlugZap,
  RefreshCw,
  Save,
  ShieldCheck,
  Trash2,
} from 'lucide-react';
import { useCallback, useEffect, useState } from 'react';

import { PageHeader, Surface } from '@/components/Page';
import { apiRequest, jsonOptions, setCsrfToken, setSelectedBotId } from '@/services/api';
import type {
  AdminUser,
  BotPermissionDefinition,
  BotProfile,
  BotRole,
  TelegramSettings,
} from '@/types';

interface SystemSettings {
  web_address: string;
  bind_host: string;
  upload_limit_mb: number;
  supervisor_mode: boolean;
  bot: { connected: boolean; id: string; username: string; name: string };
}

interface BotFormValues {
  label: string;
  bot_token?: string;
  enabled: boolean;
  sudo_users_id?: string;
  log_group_id?: string;
  gban_log_group_id?: string;
  message_dump_chat?: string;
  role_ids: string[];
}

interface RoleFormValues {
  name: string;
  description?: string;
  permissions: string[];
}

const TELEGRAM_APP_URL = 'https://my.telegram.org/apps';
const API_HASH_PATTERN = /^[A-Fa-f0-9]{32}$/;

function runtimeTag(profile: BotProfile) {
  if (!profile.enabled) return <Tag>已停用</Tag>;
  if (!profile.ready_to_connect) return <Tag color="warning">配置未完成</Tag>;
  const state = profile.runtime?.state || 'stopped';
  const values: Record<string, { color: string; text: string }> = {
    running: { color: 'success', text: '运行中' },
    starting: { color: 'processing', text: '启动中' },
    stopping: { color: 'processing', text: '停止中' },
    failed: { color: 'error', text: '启动失败' },
    stopped: { color: 'default', text: '已停止' },
  };
  const current = values[state] || values.stopped;
  return (
    <Tooltip title={profile.runtime?.error || undefined}>
      <Tag color={current.color}>{current.text}</Tag>
    </Tooltip>
  );
}

export default function SettingsPage() {
  const [settings, setSettings] = useState<SystemSettings | null>(null);
  const [telegram, setTelegram] = useState<TelegramSettings | null>(null);
  const [editingBot, setEditingBot] = useState<BotProfile | null>(null);
  const [botModalOpen, setBotModalOpen] = useState(false);
  const [editingRole, setEditingRole] = useState<BotRole | null>(null);
  const [roleModalOpen, setRoleModalOpen] = useState(false);
  const [globalForm] = Form.useForm();
  const [botForm] = Form.useForm<BotFormValues>();
  const [roleForm] = Form.useForm<RoleFormValues>();
  const [passwordForm] = Form.useForm();

  const reloadTelegram = useCallback(async () => {
    const current = await apiRequest<TelegramSettings>('/settings/telegram');
    setTelegram(current);
    globalForm.setFieldsValue({ api_id: current.api_id || undefined, api_hash: '' });
    window.dispatchEvent(new Event('bot-profiles-changed'));
  }, [globalForm]);

  useEffect(() => {
    apiRequest<SystemSettings>('/settings').then(setSettings).catch((error) => message.error(error.message));
    reloadTelegram().catch((error) => message.error(error.message));
  }, [reloadTelegram]);

  const openBotModal = (profile?: BotProfile) => {
    const target = profile || null;
    setEditingBot(target);
    botForm.setFieldsValue(
      target
        ? {
            label: target.label,
            bot_token: '',
            enabled: target.enabled,
            sudo_users_id: target.sudo_users_id.join(' '),
            log_group_id: target.log_group_id,
            gban_log_group_id: target.gban_log_group_id,
            message_dump_chat: target.message_dump_chat,
            role_ids: target.role_ids || ['full_access'],
          }
        : {
            label: '',
            bot_token: '',
            enabled: true,
            sudo_users_id: '',
            log_group_id: '0',
            gban_log_group_id: '0',
            message_dump_chat: '0',
            role_ids: ['full_access'],
          },
    );
    setBotModalOpen(true);
  };

  const saveBot = (values: BotFormValues) => {
    Modal.confirm({
      title: editingBot ? '保存并重启该机器人？' : '创建并启动该机器人？',
      content: '启用且配置完整时，系统会立即连接 Telegram。',
      okText: '确认保存',
      cancelText: '取消',
      onOk: async () => {
        const path = editingBot ? `/bots/${editingBot.bot_id}` : '/bots';
        const method = editingBot ? 'PUT' : 'POST';
        const saved = await apiRequest<BotProfile>(
          path,
          jsonOptions(method, { ...values, confirm: true }),
        );
        setBotModalOpen(false);
        message.success(editingBot ? '机器人配置已更新' : '机器人已创建');
        await reloadTelegram();
        if (!editingBot) setSelectedBotId(saved.bot_id);
      },
    });
  };

  const openRoleModal = (role?: BotRole) => {
    const target = role || null;
    setEditingRole(target);
    roleForm.setFieldsValue(
      target
        ? {
            name: target.name,
            description: target.description,
            permissions: target.permissions,
          }
        : {
            name: '',
            description: '',
            permissions: [],
          },
    );
    setRoleModalOpen(true);
  };

  const saveRole = (values: RoleFormValues) => {
    Modal.confirm({
      title: editingRole ? '保存角色权限？' : '创建职责角色？',
      content: editingRole
        ? '使用该角色的机器人会自动重启并应用新权限。'
        : '创建后可将角色分配给一个或多个机器人。',
      okText: '确认保存',
      cancelText: '取消',
      onOk: async () => {
        const path = editingRole ? `/roles/${editingRole.role_id}` : '/roles';
        const method = editingRole ? 'PUT' : 'POST';
        await apiRequest<BotRole>(
          path,
          jsonOptions(method, { ...values, confirm: true }),
        );
        setRoleModalOpen(false);
        message.success(editingRole ? '角色权限已更新' : '职责角色已创建');
        await reloadTelegram();
      },
    });
  };

  const roleNames = new Map(
    (telegram?.roles || []).map((role) => [role.role_id, role.name]),
  );
  const permissionNames = new Map(
    (telegram?.permission_catalog || []).map((permission) => [
      permission.key,
      permission.name,
    ]),
  );
  const permissionGroups = (telegram?.permission_catalog || []).reduce<
    Record<string, BotPermissionDefinition[]>
  >((groups, permission) => {
    (groups[permission.group] ||= []).push(permission);
    return groups;
  }, {});

  const botColumns = [
    {
      title: '机器人',
      key: 'bot',
      render: (_: unknown, profile: BotProfile) => (
        <div>
          <strong>{profile.label}</strong>
          <div style={{ color: '#52606d', marginTop: 2 }}>
            {profile.identity?.username ? `@${profile.identity.username}` : '尚未验证身份'}
          </div>
        </div>
      ),
    },
    {
      title: '令牌',
      dataIndex: 'bot_token_configured',
      width: 96,
      render: (configured: boolean) => (
        <Tag color={configured ? 'success' : 'warning'}>{configured ? '已配置' : '未配置'}</Tag>
      ),
    },
    {
      title: '连接状态',
      key: 'runtime',
      width: 120,
      render: (_: unknown, profile: BotProfile) => runtimeTag(profile),
    },
    {
      title: '职责角色',
      dataIndex: 'role_ids',
      minWidth: 180,
      render: (roleIds: string[]) => (
        <Space size={[4, 4]} wrap>
          {(roleIds || []).map((roleId) => (
            <Tag key={roleId}>{roleNames.get(roleId) || roleId}</Tag>
          ))}
          {!roleIds?.length ? <Tag color="warning">未分配职责</Tag> : null}
        </Space>
      ),
    },
    {
      title: '媒体中转群',
      dataIndex: 'message_dump_chat',
      width: 150,
      render: (value: string) => (value && value !== '0' ? value : '未配置'),
    },
    {
      title: '操作',
      key: 'actions',
      width: 190,
      fixed: 'right' as const,
      render: (_: unknown, profile: BotProfile) => (
        <Space size={4}>
          <Tooltip title="验证机器人令牌">
            <Button
              aria-label="验证机器人令牌"
              icon={<PlugZap size={16} />}
              disabled={!profile.bot_token_configured}
              onClick={() =>
                Modal.confirm({
                  title: `验证 ${profile.label} 的机器人令牌？`,
                  okText: '开始验证',
                  cancelText: '取消',
                  onOk: async () => {
                    const identity = await apiRequest<{ username: string }>(
                      `/bots/${profile.bot_id}/test`,
                      jsonOptions('POST', { confirm: true }),
                    );
                    message.success(`机器人令牌有效：@${identity.username}`);
                    await reloadTelegram();
                  },
                })
              }
            />
          </Tooltip>
          <Tooltip title="重启机器人">
            <Button
              aria-label="重启机器人"
              icon={<RefreshCw size={16} />}
              disabled={!profile.enabled || !profile.ready_to_connect}
              onClick={() =>
                Modal.confirm({
                  title: `重启 ${profile.label}？`,
                  okText: '确认重启',
                  cancelText: '取消',
                  onOk: async () => {
                    await apiRequest(
                      `/bots/${profile.bot_id}/restart`,
                      jsonOptions('POST', { confirm: true }),
                    );
                    message.success('机器人正在重启');
                    await reloadTelegram();
                  },
                })
              }
            />
          </Tooltip>
          <Tooltip title="编辑机器人">
            <Button
              aria-label="编辑机器人"
              icon={<Pencil size={16} />}
              onClick={() => openBotModal(profile)}
            />
          </Tooltip>
          <Tooltip title="删除机器人">
            <Button
              danger
              aria-label="删除机器人"
              icon={<Trash2 size={16} />}
              onClick={() =>
                Modal.confirm({
                  title: `删除 ${profile.label}？`,
                  content: '工作进程会停止，群数据和操作日志不会被删除。',
                  okText: '确认删除',
                  okButtonProps: { danger: true },
                  cancelText: '取消',
                  onOk: async () => {
                    await apiRequest(
                      `/bots/${profile.bot_id}`,
                      jsonOptions('DELETE', { confirm: true }),
                    );
                    message.success('机器人配置已删除');
                    await reloadTelegram();
                  },
                })
              }
            />
          </Tooltip>
        </Space>
      ),
    },
  ];

  const roleColumns = [
    {
      title: '角色',
      key: 'role',
      minWidth: 180,
      render: (_: unknown, role: BotRole) => (
        <div>
          <Space size={6}>
            <strong>{role.name}</strong>
            {role.builtin ? <Tag color="processing">内置</Tag> : <Tag>自定义</Tag>}
          </Space>
          <div style={{ color: '#52606d', marginTop: 4 }}>{role.description || '无说明'}</div>
        </div>
      ),
    },
    {
      title: '权限',
      dataIndex: 'permissions',
      minWidth: 360,
      render: (permissions: string[]) => (
        <Space size={[4, 4]} wrap>
          {permissions.map((permission) => (
            <Tag key={permission}>{permissionNames.get(permission) || permission}</Tag>
          ))}
          {!permissions.length ? <Tag color="warning">无权限</Tag> : null}
        </Space>
      ),
    },
    {
      title: '操作',
      key: 'actions',
      width: 110,
      fixed: 'right' as const,
      render: (_: unknown, role: BotRole) =>
        role.builtin ? null : (
          <Space size={4}>
            <Tooltip title="编辑角色">
              <Button
                aria-label={`编辑角色 ${role.name}`}
                icon={<Pencil size={16} />}
                onClick={() => openRoleModal(role)}
              />
            </Tooltip>
            <Tooltip title="删除角色">
              <Button
                danger
                aria-label={`删除角色 ${role.name}`}
                icon={<Trash2 size={16} />}
                onClick={() =>
                  Modal.confirm({
                    title: `删除角色 ${role.name}？`,
                    content: '已分配给机器人的角色不能删除。',
                    okText: '确认删除',
                    okButtonProps: { danger: true },
                    cancelText: '取消',
                    onOk: async () => {
                      await apiRequest(
                        `/roles/${role.role_id}`,
                        jsonOptions('DELETE', { confirm: true }),
                      );
                      message.success('职责角色已删除');
                      await reloadTelegram();
                    },
                  })
                }
              />
            </Tooltip>
          </Space>
        ),
    },
  ];

  return (
    <>
      <PageHeader title="系统设置" />
      <Surface
        title="机器人配置中心"
        actions={
          <Button type="primary" icon={<CirclePlus size={16} />} onClick={() => openBotModal()}>
            添加机器人
          </Button>
        }
      >
        <Form
          form={globalForm}
          layout="vertical"
          onFinish={(values) =>
            Modal.confirm({
              title: '更新 Telegram 应用接口凭据？',
              content: '所有启用的机器人会依次重启并应用新配置。',
              okText: '确认更新',
              cancelText: '取消',
              onOk: async () => {
                await apiRequest(
                  '/settings/telegram',
                  jsonOptions('PUT', { ...values, confirm: true }),
                );
                message.success('Telegram 应用接口配置已更新');
                await reloadTelegram();
              },
            })
          }
        >
          <Row gutter={16} align="bottom">
            <Col xs={24} md={8}>
              <Form.Item
                name="api_id"
                label="Telegram 应用编号（API ID）"
                extra={
                  <span>
                    来自{' '}
                    <a href={TELEGRAM_APP_URL} target="_blank" rel="noreferrer">
                      my.telegram.org/apps
                    </a>
                    ，不是机器人编号。
                  </span>
                }
                rules={[{ required: true, message: '请输入 Telegram 应用编号' }]}
              >
                <InputNumber min={1} precision={0} style={{ width: '100%' }} />
              </Form.Item>
            </Col>
            <Col xs={24} md={10}>
              <Form.Item
                name="api_hash"
                label="Telegram 应用密钥（API Hash）"
                extra="32 位十六进制字符串，不是机器人令牌。"
                rules={[
                  {
                    required: !telegram?.api_hash_configured,
                    message: '请输入 Telegram 应用密钥',
                  },
                  {
                    pattern: API_HASH_PATTERN,
                    message: 'Telegram 应用密钥必须是 32 位十六进制字符串',
                  },
                ]}
              >
                <Input.Password
                  autoComplete="new-password"
                  placeholder={
                    telegram?.api_hash_configured ? '已配置，留空保持不变' : '请输入 Telegram 应用密钥'
                  }
                />
              </Form.Item>
            </Col>
            <Col xs={24} md={6}>
              <Form.Item>
                <Button type="primary" htmlType="submit" icon={<Save size={16} />} block>
                  保存 API 配置
                </Button>
              </Form.Item>
            </Col>
          </Row>
        </Form>
        {!telegram?.api_ready ? (
          <Alert
            type="warning"
            showIcon
            message="Telegram 应用接口凭据尚未配置"
            description="填写 my.telegram.org/apps 提供的应用编号和应用密钥后，已启用的机器人才会启动。"
          />
        ) : null}
        <div className="table-wrap" style={{ marginTop: 16 }}>
          <Table<BotProfile>
            rowKey="bot_id"
            columns={botColumns}
            dataSource={telegram?.bots || []}
            pagination={false}
            scroll={{ x: 980 }}
            locale={{ emptyText: '尚未添加机器人' }}
          />
        </div>
      </Surface>

      <div style={{ height: 16 }} />
      <Surface
        title="职责角色"
        actions={
          <Button type="primary" icon={<CirclePlus size={16} />} onClick={() => openRoleModal()}>
            新建角色
          </Button>
        }
      >
        <Alert
          type="info"
          showIcon
          message="机器人可同时分配多个角色，最终权限为所有角色权限的并集。"
          style={{ marginBottom: 16 }}
        />
        <div className="table-wrap">
          <Table<BotRole>
            rowKey="role_id"
            columns={roleColumns}
            dataSource={telegram?.roles || []}
            pagination={false}
            scroll={{ x: 760 }}
          />
        </div>
      </Surface>

      <div style={{ height: 16 }} />
      <div className="split-grid">
        <Surface title="运行信息">
          {settings ? (
            <Descriptions column={1} size="small" bordered>
              <Descriptions.Item label="本地地址">{settings.web_address}</Descriptions.Item>
              <Descriptions.Item label="监听地址">{settings.bind_host}</Descriptions.Item>
              <Descriptions.Item label="上传限制">{settings.upload_limit_mb} MB</Descriptions.Item>
              <Descriptions.Item label="运行模式">
                <Tag color={settings.supervisor_mode ? 'processing' : 'success'}>
                  {settings.supervisor_mode ? '多机器人监管' : '机器人工作进程'}
                </Tag>
              </Descriptions.Item>
            </Descriptions>
          ) : null}
        </Surface>
        <Surface title="管理员密码" className="danger-zone">
          <Form
            form={passwordForm}
            layout="vertical"
            onFinish={async (values) => {
              const user = await apiRequest<AdminUser>(
                '/auth/password',
                jsonOptions('PUT', values),
              );
              setCsrfToken(user.csrf_token);
              passwordForm.resetFields();
              message.success('管理员密码已更新，其他会话已失效');
            }}
          >
            <Form.Item name="current_password" label="当前密码" rules={[{ required: true }]}>
              <Input.Password autoComplete="current-password" />
            </Form.Item>
            <Form.Item
              name="new_password"
              label="新密码"
              rules={[
                { required: true },
                { min: 10, message: '至少 10 个字符' },
                { pattern: /[A-Za-z]/, message: '至少包含一个字母' },
                { pattern: /\d/, message: '至少包含一个数字' },
              ]}
            >
              <Input.Password autoComplete="new-password" />
            </Form.Item>
            <Button type="primary" danger htmlType="submit" icon={<KeyRound size={16} />}>
              修改密码
            </Button>
          </Form>
        </Surface>
      </div>

      <div style={{ height: 16 }} />
      <Surface title="安全策略">
        <Descriptions column={{ xs: 1, sm: 2, md: 3 }} size="small">
          <Descriptions.Item label="机器人凭据">
            <Bot size={16} /> 本地 0600 文件
          </Descriptions.Item>
          <Descriptions.Item label="密码摘要">
            <ShieldCheck size={16} /> scrypt + 独立盐
          </Descriptions.Item>
          <Descriptions.Item label="写操作">跨站请求防护校验</Descriptions.Item>
        </Descriptions>
      </Surface>

      <Modal
        title={editingBot ? `编辑 ${editingBot.label}` : '添加机器人'}
        open={botModalOpen}
        onCancel={() => setBotModalOpen(false)}
        onOk={() => botForm.submit()}
        okText="继续"
        cancelText="取消"
        destroyOnHidden
      >
        <Form form={botForm} layout="vertical" onFinish={saveBot} preserve={false}>
          <Form.Item name="label" label="机器人名称" rules={[{ required: true }, { max: 60 }]}>
            <Input maxLength={60} />
          </Form.Item>
          <Form.Item
            name="bot_token"
            label="机器人令牌"
            extra="填写 BotFather 提供的完整令牌，每个机器人单独配置。"
            rules={editingBot ? [] : [{ required: true }]}
          >
            <Input.Password
              autoComplete="new-password"
              placeholder={editingBot?.bot_token_configured ? '已配置，留空保持不变' : ''}
            />
          </Form.Item>
          <Form.Item name="enabled" label="启用" valuePropName="checked">
            <Switch />
          </Form.Item>
          <Form.Item
            name="role_ids"
            label="职责角色"
            extra="可多选；不选择角色时机器人只保持连接，不执行管理职责。"
          >
            <Select
              mode="multiple"
              allowClear
              placeholder="选择一个或多个职责角色"
              options={(telegram?.roles || []).map((role) => ({
                value: role.role_id,
                label: role.name,
              }))}
            />
          </Form.Item>
          <Form.Item name="sudo_users_id" label="超级管理员用户 ID">
            <Input placeholder="多个 ID 使用空格分隔" />
          </Form.Item>
          <Row gutter={12}>
            <Col xs={24} sm={12}>
              <Form.Item name="log_group_id" label="日志群 ID">
                <Input />
              </Form.Item>
            </Col>
            <Col xs={24} sm={12}>
              <Form.Item name="gban_log_group_id" label="封禁日志群 ID">
                <Input />
              </Form.Item>
            </Col>
          </Row>
          <Form.Item name="message_dump_chat" label="媒体中转群 ID">
            <Input />
          </Form.Item>
        </Form>
      </Modal>

      <Modal
        title={editingRole ? `编辑角色 ${editingRole.name}` : '新建职责角色'}
        open={roleModalOpen}
        onCancel={() => setRoleModalOpen(false)}
        onOk={() => roleForm.submit()}
        okText="继续"
        cancelText="取消"
        width={720}
        destroyOnHidden
      >
        <Form form={roleForm} layout="vertical" onFinish={saveRole} preserve={false}>
          <Form.Item
            name="name"
            label="角色名称"
            rules={[{ required: true, message: '请输入角色名称' }, { max: 60 }]}
          >
            <Input maxLength={60} />
          </Form.Item>
          <Form.Item name="description" label="角色说明" rules={[{ max: 200 }]}>
            <Input.TextArea maxLength={200} rows={2} />
          </Form.Item>
          <Form.Item name="permissions" label="职责权限">
            <Checkbox.Group style={{ width: '100%' }}>
              <Space direction="vertical" size={14} style={{ width: '100%' }}>
                {Object.entries(permissionGroups).map(([group, permissions]) => (
                  <div key={group}>
                    <Typography.Text strong>{group}</Typography.Text>
                    <Row gutter={[12, 8]} style={{ marginTop: 8 }}>
                      {permissions.map((permission) => (
                        <Col xs={24} sm={12} key={permission.key}>
                          <Checkbox value={permission.key}>
                            <span>{permission.name}</span>
                            <Typography.Text
                              type="secondary"
                              style={{ display: 'block', fontSize: 12 }}
                            >
                              {permission.description}
                            </Typography.Text>
                          </Checkbox>
                        </Col>
                      ))}
                    </Row>
                  </div>
                ))}
              </Space>
            </Checkbox.Group>
          </Form.Item>
        </Form>
      </Modal>
    </>
  );
}