import { memo, useCallback, useEffect, useState } from 'react'
import { Globe, Save } from 'lucide-react'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
import { cn } from '@/lib/utils'
import { settingsApi, type ImageRegistryConfig } from '@/api/settings'
import { toast } from 'sonner'

const MODES = [
  { value: 'overseas', label: '海外官方', desc: 'docker.io,海外网络环境' },
  { value: 'cn', label: '国内加速', desc: 'docker.m.daocloud.io 镜像,国内环境防被墙' },
  { value: 'custom', label: '私有仓库', desc: '自有 registry 前缀(如华为云 SWR)' },
] as const

const COMPONENTS = [
  { key: 'loki', label: 'Loki', repo: 'grafana/loki', tagHint: '跟随部署版本' },
  { key: 'grafana', label: 'Grafana', repo: 'grafana/grafana', tagHint: '跟随部署版本' },
  { key: 'promtail', label: 'Promtail', repo: 'grafana/promtail', tagHint: '3.4.0' },
  { key: 'fluentbit', label: 'Fluent Bit', repo: 'fluent/fluent-bit', tagHint: '5.1.5' },
] as const

/**
 * 镜像源设置 — 影响平台拉取的全部镜像(Loki/Grafana/Promtail/Fluent Bit),
 * 参照 kuboard 的国内/海外选择;实时预览四类镜像的生效地址。
 */
export const ImageRegistrySection = memo(function ImageRegistrySection() {
  const [cfg, setCfg] = useState<ImageRegistryConfig | null>(null)
  const [customHost, setCustomHost] = useState('')
  const [saving, setSaving] = useState(false)

  useEffect(() => {
    settingsApi
      .getImageRegistry()
      .then((c) => {
        setCfg(c)
        setCustomHost(c.customHost || '')
      })
      .catch(() => toast.error('加载镜像源配置失败'))
  }, [])

  const handleSave = useCallback(async () => {
    if (!cfg) return
    setSaving(true)
    try {
      const saved = await settingsApi.saveImageRegistry({
        mode: cfg.mode,
        customHost: cfg.mode === 'custom' ? customHost : undefined,
        images: cfg.images,
      })
      setCfg(saved)
      toast.success('镜像源已保存,后续部署/采集将使用新镜像地址')
    } catch (err) {
      toast.error(err instanceof Error ? err.message : '保存失败')
    } finally {
      setSaving(false)
    }
  }, [cfg, customHost])

  if (!cfg) return null

  return (
    <Card className="border-border">
      <CardHeader className="pb-3">
        <CardTitle className="text-base flex items-center gap-2">
          <Globe className="w-4 h-4" />
          镜像仓库源
        </CardTitle>
      </CardHeader>
      <CardContent className="space-y-4">
        <div className="grid grid-cols-1 md:grid-cols-3 gap-3">
          {MODES.map((m) => (
            <button
              key={m.value}
              type="button"
              aria-pressed={cfg.mode === m.value}
              onClick={() => setCfg({ ...cfg, mode: m.value })}
              className={cn(
                'text-left rounded-xl border-2 p-3 transition-all',
                cfg.mode === m.value ? 'border-primary bg-primary/5' : 'border-border hover:border-input'
              )}
            >
              <p className={cn('text-sm font-medium', cfg.mode === m.value && 'text-primary')}>{m.label}</p>
              <p className="text-xs text-muted-foreground mt-1">{m.desc}</p>
            </button>
          ))}
        </div>

        {cfg.mode === 'custom' && (
          <div className="space-y-2">
            <Label>私有仓库前缀 *</Label>
            <Input
              placeholder="swr.cn-east-2.myhuaweicloud.com/your-namespace"
              value={customHost}
              onChange={(e) => setCustomHost(e.target.value)}
            />
            <p className="text-xs text-muted-foreground">平台会在镜像名前拼接此前缀,如 {customHost || 'your-registry'}/grafana/loki:3.4.0</p>
          </div>
        )}

        {/* 各服务镜像自定义 */}
        <div className="space-y-2">
          <Label>各服务镜像（可单独覆盖仓库 / Tag）</Label>
          <div className="space-y-2">
            {COMPONENTS.map(({ key, label, repo, tagHint }) => {
              const img = cfg.images?.[key] || { repository: '', tag: '' }
              const update = (patch: Partial<{ repository: string; tag: string }>) =>
                setCfg({
                  ...cfg,
                  images: { ...(cfg.images || {}), [key]: { ...img, ...patch } },
                })
              return (
                <div key={key} className="grid items-center gap-2 sm:grid-cols-[110px_1fr_150px]">
                  <span className="text-sm font-medium">{label}</span>
                  <Input
                    aria-label={`${label} 镜像仓库`}
                    value={img.repository}
                    placeholder={repo}
                    onChange={(e) => update({ repository: e.target.value })}
                    className="font-mono text-xs"
                  />
                  <Input
                    aria-label={`${label} 镜像 Tag`}
                    value={img.tag}
                    placeholder={tagHint}
                    onChange={(e) => update({ tag: e.target.value })}
                    className="font-mono text-xs"
                  />
                </div>
              )
            })}
          </div>
          <p className="text-xs text-muted-foreground">
            仓库填镜像路径（如 <code>grafana/loki</code>）；Tag 留空时 Loki / Grafana 跟随部署版本，Promtail / Fluent Bit 用内置默认。
          </p>
        </div>

        {/* 生效镜像预览 */}
        <div className="rounded-lg bg-muted/50 p-3 space-y-1.5">
          <p className="text-xs font-medium text-muted-foreground">生效镜像预览</p>
          {([
            ['Loki', cfg.sampleLoki],
            ['Grafana', cfg.sampleGrafana],
            ['Promtail', cfg.samplePromtail],
            ['Fluent Bit', cfg.sampleFluentBit],
          ] as const).map(([name, img]) => (
            <p key={name} className="text-xs font-mono flex gap-2">
              <span className="text-muted-foreground w-20 shrink-0">{name}</span>
              <span className="truncate" title={img}>{img}</span>
            </p>
          ))}
        </div>

        <div className="flex justify-end">
          <Button onClick={handleSave} disabled={saving}>
            <Save className="w-4 h-4 mr-1" />
            {saving ? '保存中...' : '保存镜像源'}
          </Button>
        </div>
      </CardContent>
    </Card>
  )
})