import { Button, Drawer, FormField, Icon, Input, Notice, Space, Textarea } from '@stash/ui'
import { useEffect, useState } from 'react'
import { fetchItem, saveItem, type EntryRecord } from '../../items'

/**
 * 条目编辑器（P2）：右侧 Drawer 表单，就地改标题 / 简介 / 标签 / 正文等。
 *
 * `updatedAt` 做乐观锁：别人先改过就提示刷新，避免静默覆盖。
 */
type ItemEditorProps = {
  open: boolean
  itemKey: string | null
  onClose: () => void
  onSaved: (entry: EntryRecord) => void
}

type FormState = {
  name: string
  description: string
  tags: string
  badge: string
  comment: string
  summary: string
  body: string
  cover: string
  banner: string
  href: string
}

const emptyForm: FormState = {
  name: '',
  description: '',
  tags: '',
  badge: '',
  comment: '',
  summary: '',
  body: '',
  cover: '',
  banner: '',
  href: '',
}

export function ItemEditor({ open, itemKey, onClose, onSaved }: ItemEditorProps) {
  const [entry, setEntry] = useState<EntryRecord | null>(null)
  const [form, setForm] = useState<FormState>(emptyForm)
  const [loading, setLoading] = useState(false)
  const [saving, setSaving] = useState(false)
  const [error, setError] = useState('')

  useEffect(() => {
    if (!open || itemKey === null) return

    let alive = true
    setLoading(true)
    setError('')
    fetchItem(itemKey).then((result) => {
      if (!alive) return
      setLoading(false)
      if (!result.ok) {
        setError(result.error)
        return
      }

      const next = result.entry
      setEntry(next)
      setForm({
        name: next.name,
        description: next.description,
        tags: next.tags.join('，'),
        badge: next.badge,
        comment: next.comment,
        summary: next.summary,
        body: next.body,
        cover: next.cover,
        banner: next.banner,
        href: next.href,
      })
    })

    return () => {
      alive = false
    }
  }, [open, itemKey])

  const update = (patch: Partial<FormState>) => setForm((previous) => ({ ...previous, ...patch }))

  const save = async () => {
    if (entry === null) return
    setSaving(true)
    setError('')

    const result = await saveItem(entry.key, entry.updated_at, {
      ...form,
      format: entry.format,
      icon: entry.icon,
      tags: form.tags
        .split(/[，,]/)
        .map((tag) => tag.trim())
        .filter(Boolean),
    })

    setSaving(false)
    if (!result.ok) {
      setError(result.error)
      return
    }

    onSaved(result.entry)
    onClose()
  }

  return (
    <Drawer
      open={open}
      onClose={onClose}
      width={520}
      title="编辑条目"
      footer={
        <Space gap="sm" justify="end">
          <Button variant="secondary" onClick={onClose}>
            取消
          </Button>
          <Button
            loading={saving}
            disabled={loading}
            icon={<Icon name="check_line" />}
            onClick={save}
          >
            保存
          </Button>
        </Space>
      }
    >
      {loading && <p>正在读取…</p>}
      {error !== '' && (
        <Notice tone="error" title="保存失败">
          {error}
        </Notice>
      )}

      {!loading && entry !== null && (
        <Space direction="column" gap="md" align="stretch">
          <FormField label="标题" htmlFor="edit-name" required>
            <Input
              id="edit-name"
              value={form.name}
              onChange={(event) => update({ name: event.target.value })}
            />
          </FormField>

          <FormField label="简介" htmlFor="edit-description" hint="列表卡片上的一行说明">
            <Input
              id="edit-description"
              value={form.description}
              onChange={(event) => update({ description: event.target.value })}
            />
          </FormField>

          <FormField label="标签" htmlFor="edit-tags" hint="用逗号分隔，例如：推荐电影，动画">
            <Input
              id="edit-tags"
              value={form.tags}
              onChange={(event) => update({ tags: event.target.value })}
            />
          </FormField>

          <FormField label="一句话评价" htmlFor="edit-comment">
            <Input
              id="edit-comment"
              value={form.comment}
              onChange={(event) => update({ comment: event.target.value })}
            />
          </FormField>

          <FormField label="正文" htmlFor="edit-body" hint="支持 Markdown：##、段落、链接、图片">
            <Textarea
              id="edit-body"
              rows={8}
              value={form.body}
              onChange={(event) => update({ body: event.target.value })}
            />
          </FormField>

          <FormField label="封面地址" htmlFor="edit-cover">
            <Input
              id="edit-cover"
              value={form.cover}
              placeholder="https://…"
              onChange={(event) => update({ cover: event.target.value })}
            />
          </FormField>

          <FormField
            label="跳转地址"
            htmlFor="edit-href"
            hint="可填 https://、www. 开头的域名或站内路径 /foo；留空则不显示跳转"
          >
            <Input
              id="edit-href"
              value={form.href}
              placeholder="https://… 或 /project/"
              onChange={(event) => update({ href: event.target.value })}
            />
          </FormField>
        </Space>
      )}
    </Drawer>
  )
}