import { useState, useEffect } from 'react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { Label } from '@/components/ui/label';
import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { kubernetesApi } from '@/api';
import { toast } from 'sonner';
import type { JsonData } from '@/types/common';

// 名称即 code，只允许英文/数字/连字符
const NAME_RE = /^[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?$/;

const emptyForm = {
  name: '',
  version: '',
  description: '',
  config_type: 1, // 0=Token, 1=Kubeconfig
  api_server: '',
  token: '',
  kube_config: '',
};

export function KubernetesClusterDialog({
  open,
  onOpenChange,
  editingCluster,
  onSaved,
}: {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  editingCluster?: JsonData;
  onSaved: () => void;
}) {
  const [formData, setFormData] = useState({ ...emptyForm });
  const [submitting, setSubmitting] = useState(false);
  const [hasToken, setHasToken] = useState(false);
  const [hasKubeConfig, setHasKubeConfig] = useState(false);
  const [nameError, setNameError] = useState('');

  useEffect(() => {
    if (!open) return;
    if (editingCluster && editingCluster.id) {
      kubernetesApi.getClusterDetail(editingCluster.id).then((res: JsonData) => {
        const d = res || {};
        setHasToken(!!d.has_token);
        setHasKubeConfig(!!d.has_kube_config);
        setFormData({
          name: d.name || '',
          version: d.version || '',
          description: d.description || '',
          config_type: Number(d.config_type ?? 1),
          api_server: d.api_server || '',
          token: '',
          kube_config: '',
        });
        setNameError('');
      }).catch(() => {
        setFormData({
          name: editingCluster.name || '',
          version: editingCluster.version || '',
          description: editingCluster.description || '',
          config_type: Number(editingCluster.config_type ?? 1),
          api_server: editingCluster.api_server || '',
          token: '',
          kube_config: '',
        });
        setNameError('');
      });
    } else {
      setHasToken(false);
      setHasKubeConfig(false);
      setFormData({ ...emptyForm });
      setNameError('');
    }
  }, [open, editingCluster]);

  const handleNameChange = (value: string) => {
    setFormData({ ...formData, name: value });
    if (!value.trim()) {
      setNameError('');
    } else if (!NAME_RE.test(value)) {
      setNameError('只允许英文、数字和连字符(-)，首尾不能是连字符');
    } else {
      setNameError('');
    }
  };

  const parseApiServer = (yaml: string): string => {
    const match = yaml.match(/^\s*server:\s*(\S+)\s*$/m);
    return match ? match[1] : '';
  };

  const handleKubeConfigChange = (value: string) => {
    const server = parseApiServer(value);
    setFormData((prev) => ({
      ...prev,
      kube_config: value,
      api_server: server || prev.api_server,
    }));
  };

  const handleSubmit = async () => {
    if (!formData.name.trim() || !NAME_RE.test(formData.name.trim())) {
      toast.error('请输入有效的集群名称（英文/数字/连字符）'); return;
    }
    try {
      setSubmitting(true);
      const payload = {
        name: formData.name.trim(),
        code: formData.name.trim(),  // 名称即 code
        version: formData.version,
        description: formData.description,
        config_type: formData.config_type,
        api_server: formData.api_server,
        token: formData.config_type === 0 ? formData.token : '',
        kube_config: formData.config_type === 1 ? formData.kube_config : '',
      };
      if (editingCluster) {
        await kubernetesApi.updateCluster(editingCluster.id, payload);
      } else {
        await kubernetesApi.createCluster(payload);
      }
      onOpenChange(false);
      onSaved();
    } catch (e) {
      console.error('保存集群失败:', e);
    } finally {
      setSubmitting(false);
    }
  };

  const canSubmit = submitting || !formData.name.trim() || !!nameError;

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="bg-[var(--dg-bg-secondary)] border-[var(--dg-border)] max-w-2xl">
        <DialogHeader>
          <DialogTitle className="text-[var(--dg-text-primary)]">
            {editingCluster ? '编辑集群' : '添加集群'}
          </DialogTitle>
          <DialogDescription className="text-[var(--dg-text-secondary)]">
            {editingCluster ? '修改集群接入配置' : '配置新的 Kubernetes 集群接入信息'}
          </DialogDescription>
        </DialogHeader>
        <div className="space-y-4 py-2 max-h-[60vh] overflow-y-auto pr-1">
          <div className="grid grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label className="text-[var(--dg-text-secondary)]">集群名称</Label>
              <Input
                value={formData.name}
                onChange={(e) => handleNameChange(e.target.value)}
                placeholder="如: prod-cluster"
                className={`bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)] ${nameError ? 'border-red-500' : ''}`}
              />
              {nameError && <p className="text-xs text-red-400">{nameError}</p>}
              <p className="text-xs text-[var(--dg-text-muted)]">
                只允许英文、数字和连字符(-)，首尾不能是连字符。名称将作为集群唯一标识。
              </p>
            </div>
            <div className="space-y-2">
              <Label className="text-[var(--dg-text-secondary)]">版本（可选）</Label>
              <Input
                value={formData.version}
                onChange={(e) => setFormData({ ...formData, version: e.target.value })}
                placeholder="如: 1.28.0"
                className="bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)]"
              />
            </div>
          </div>

          <div className="space-y-2">
            <Label className="text-[var(--dg-text-secondary)]">描述</Label>
            <Input
              value={formData.description}
              onChange={(e) => setFormData({ ...formData, description: e.target.value })}
              placeholder="集群用途描述"
              className="bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)]"
            />
          </div>

          <div className="space-y-2">
            <Label className="text-[var(--dg-text-secondary)]">接入方式</Label>
            <RadioGroup
              value={String(formData.config_type)}
              onValueChange={(v) => setFormData({ ...formData, config_type: Number(v) })}
              className="flex gap-4"
            >
              <div className="flex items-center gap-2 px-3 py-2 rounded-md border border-[var(--dg-border)] cursor-pointer hover:bg-[var(--dg-bg-hover)]">
                <RadioGroupItem value="0" id="ct-0" />
                <Label htmlFor="ct-0" className="cursor-pointer text-[var(--dg-text-primary)] font-normal">Token</Label>
              </div>
              <div className="flex items-center gap-2 px-3 py-2 rounded-md border border-[var(--dg-border)] cursor-pointer hover:bg-[var(--dg-bg-hover)]">
                <RadioGroupItem value="1" id="ct-1" />
                <Label htmlFor="ct-1" className="cursor-pointer text-[var(--dg-text-primary)] font-normal">Kubeconfig</Label>
              </div>
            </RadioGroup>
          </div>

          <div className="space-y-2">
            <Label className="text-[var(--dg-text-secondary)]">API Server</Label>
            <Input
              value={formData.api_server}
              onChange={(e) => setFormData({ ...formData, api_server: e.target.value })}
              placeholder="https://10.0.0.1:6443"
              className="bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)]"
            />
          </div>

          {formData.config_type === 0 ? (
            <div className="space-y-2">
              <Label className="text-[var(--dg-text-secondary)]">
                Token {hasToken && <span className="text-emerald-400 text-xs ml-1">✓ 已配置（留空不修改）</span>}
              </Label>
              <Textarea
                value={formData.token}
                onChange={(e) => setFormData({ ...formData, token: e.target.value })}
                placeholder={hasToken ? '已配置，输入新值覆盖...' : '粘贴 Service Account Token...'}
                rows={4}
                className="bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)] font-mono text-xs"
              />
            </div>
          ) : (
            <div className="space-y-2">
              <Label className="text-[var(--dg-text-secondary)]">
                Kubeconfig {hasKubeConfig && <span className="text-emerald-400 text-xs ml-1">✓ 已配置（留空不修改）</span>}
              </Label>
              <Textarea
                value={formData.kube_config}
                onChange={(e) => handleKubeConfigChange(e.target.value)}
                placeholder={hasKubeConfig ? '已配置，输入新值覆盖...' : 'apiVersion: v1\nkind: Config\nclusters:\n- cluster:\n    server: https://10.0.0.1:6443\n    ...'}
                rows={10}
                className="bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] placeholder:text-[var(--dg-text-muted)] font-mono text-xs"
              />
              {!hasKubeConfig && (
                <p className="text-xs text-[var(--dg-text-muted)]">
                  粘贴 kubeconfig 内容后将自动解析 API Server 地址
                </p>
              )}
            </div>
          )}
        </div>
        <DialogFooter>
          <Button
            variant="outline"
            onClick={() => { onOpenChange(false); }}
            className="border-[var(--dg-border)] text-[var(--dg-text-secondary)] hover:text-[var(--dg-text-primary)] hover:bg-[var(--dg-bg-hover)]"
          >
            取消
          </Button>
          <Button
            onClick={handleSubmit}
            disabled={canSubmit}
            className="bg-[var(--dg-blue)] hover:opacity-90 text-white"
          >
            {submitting ? '保存中...' : editingCluster ? '保存' : '添加'}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}