/**
 * 条目编辑的前端接口。
 *
 * 读取是公开的（编辑表单要能预览），写入必须登录，并用 `updatedAt` 做乐观锁。
 */
export type EntryFormat = 'apps' | 'posters' | 'articles'

export type EntryRecord = {
  key: string
  format: EntryFormat
  name: string
  description: string
  icon: string
  href: string
  cover: string
  banner: string
  badge: string
  comment: string
  summary: string
  body: string
  tags: string[]
  updated_at: number
}

export type EntryInput = {
  name: string
  /** 条目的展示格式；不传由后端按 apps 处理 */
  format?: EntryFormat
  description: string
  icon: string
  tags: string[]
  badge: string
  comment: string
  summary: string
  body: string
  cover: string
  banner: string
  href: string
  /** 编辑时传目标分区/分组，可移动条目 */
  nodeKey?: string
}

export type ItemResult =
  | { ok: true; entry: EntryRecord }
  | { ok: false; status: number; error: string }

export async function fetchItem(key: string): Promise<ItemResult> {
  try {
    const response = await fetch(`/api/items/${encodeURIComponent(key)}`, {
      credentials: 'same-origin',
    })
    if (response.ok) {
      return { ok: true, entry: (await response.json()) as EntryRecord }
    }
    const payload = (await response.json().catch(() => null)) as { error?: string } | null
    return { ok: false, status: response.status, error: payload?.error ?? '读取失败' }
  } catch (error) {
    return { ok: false, status: 0, error: error instanceof Error ? error.message : '网络错误' }
  }
}

export async function saveItem(
  key: string,
  updatedAt: number,
  item: EntryInput,
): Promise<ItemResult> {
  try {
    const response = await fetch(`/api/items/${encodeURIComponent(key)}`, {
      method: 'PATCH',
      credentials: 'same-origin',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify({ updatedAt, item }),
    })

    if (response.ok) {
      return { ok: true, entry: (await response.json()) as EntryRecord }
    }

    const payload = (await response.json().catch(() => null)) as { error?: string } | null
    return {
      ok: false,
      status: response.status,
      error: payload?.error ?? `保存失败（${response.status}）`,
    }
  } catch (error) {
    return { ok: false, status: 0, error: error instanceof Error ? error.message : '网络错误' }
  }
}

/** 新建条目：指定分区 / 分组与字段 */
export async function createItem(input: {
  key: string
  nodeKey: string
  item: EntryInput
}): Promise<SimpleResult> {
  try {
    const response = await fetch('/api/items', {
      method: 'POST',
      credentials: 'same-origin',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify(input),
    })
    if (response.ok) return { ok: true }
    const payload = (await response.json().catch(() => null)) as { error?: string } | null
    return { ok: false, error: payload?.error ?? `创建失败（${response.status}）` }
  } catch (error) {
    return { ok: false, error: error instanceof Error ? error.message : '网络错误' }
  }
}

/** 删除条目 */
export async function deleteItem(key: string): Promise<SimpleResult> {
  try {
    const response = await fetch(`/api/items/${encodeURIComponent(key)}`, {
      method: 'DELETE',
      credentials: 'same-origin',
    })
    if (response.ok) return { ok: true }
    const payload = (await response.json().catch(() => null)) as { error?: string } | null
    return { ok: false, error: payload?.error ?? `删除失败（${response.status}）` }
  } catch (error) {
    return { ok: false, error: error instanceof Error ? error.message : '网络错误' }
  }
}

export type SimpleResult = { ok: true } | { ok: false; error: string }