import type { Issue } from '../gitea/types'

export const KANBAN_SNAPSHOT_KEY = 'superpowers.kanbanSnapshot'

export interface KanbanSnapshot {
  issues: Issue[]
  scope: 'mine' | 'all'
  me?: string
  /** Gitea login → 头像 data URI；团队视图下卡片按人贴头像。 */
  avatars?: Record<string, string>
  globalAutoReview: boolean
  youtrackConfigured: boolean
}

function isAvatarMap(raw: unknown): raw is Record<string, string> {
  return !!raw && typeof raw === 'object' && Object.values(raw).every(v => typeof v === 'string')
}

export function parseKanbanSnapshot(raw: unknown): KanbanSnapshot | null {
  if (!raw || typeof raw !== 'object')
    return null
  const obj = raw as Record<string, unknown>
  if (!Array.isArray(obj.issues))
    return null
  if (obj.scope !== 'mine' && obj.scope !== 'all')
    return null
  return {
    issues: obj.issues as Issue[],
    scope: obj.scope,
    me: typeof obj.me === 'string' ? obj.me : undefined,
    avatars: isAvatarMap(obj.avatars) ? obj.avatars : undefined,
    globalAutoReview: obj.globalAutoReview === true,
    youtrackConfigured: obj.youtrackConfigured === true,
  }
}

/** 看板上现在摆着的工单，和它从哪来：面板这次会话里加载好的（loaded）、上次存下的快照（saved）。 */
export interface BoardIssues {
  issues: Issue[]
  from: 'loaded' | 'saved'
}

/**
 * 看板上现在摆着的工单：面板这次会话里加载好了就用它最近一次加载的，否则用上次存下的快照
 * （重开窗口时看板先画的也是它）；都没有时 undefined，看板还没加载过。
 */
export function boardIssues(loaded: Issue[] | undefined, persisted: unknown): BoardIssues | undefined {
  if (loaded)
    return { issues: loaded, from: 'loaded' }
  const snapshot = parseKanbanSnapshot(persisted)
  return snapshot ? { issues: snapshot.issues, from: 'saved' } : undefined
}

/** 写入 HTML 的 JSON：小于号换成 \\u003c，避免 script 标签被提前关掉。 */
export function snapshotToScriptJson(snapshot: KanbanSnapshot): string {
  return JSON.stringify(snapshot).replace(/</g, '\\u003c')
}

export function snapshotScriptTag(nonce: string, snapshot: KanbanSnapshot): string {
  return `<script nonce="${nonce}" type="application/json" id="kanban-snapshot">${snapshotToScriptJson(snapshot)}</script>`
}