import type { HandoffProfiles, HandoffSessions } from '../../cc/handoffManifest'
import type { IssueColumn } from '../../gitea/types'
import { LOCAL_STATE_FIELDS } from '../../issues/localState'

export function canStartHandoff(issue: {
  source?: 'gitea' | 'youtrack'
  column: IssueColumn
  handoffAttachmentId?: string
  assignees?: string[]
}, me: string | undefined): boolean {
  const assignees = issue.assignees ?? []
  const mine = assignees.length === 0 || (me !== undefined && assignees.includes(me))
  return issue.source !== 'youtrack' && issue.column !== 'done' && !issue.handoffAttachmentId && mine
}

export function canAcceptHandoff(issue: {
  source?: 'gitea' | 'youtrack'
  handoffAttachmentId?: string
  assignees?: string[]
}, me: string | undefined): boolean {
  return issue.source !== 'youtrack'
    && !!issue.handoffAttachmentId
    && me !== undefined
    && (issue.assignees ?? []).includes(me)
}

/** 移交前 worktree 必须「干净 + 全部 push」，否则接管方从远端重建会丢工作。 */
export function checkWorktreePushed(input: {
  statusPorcelain: string
  localHead: string
  remoteHead: string
}): { ok: true } | { ok: false, reason: string } {
  if (input.statusPorcelain.trim().length > 0)
    return { ok: false, reason: '工作区有未提交改动，请先提交并 push' }
  if (input.localHead.trim() !== input.remoteHead.trim())
    return { ok: false, reason: '本地分支与远端不一致，请先 push' }
  return { ok: true }
}

/**
 * 共享墓碑：只写 handoffAttachmentId / handoffFrom 两个共享字段。本机
 * sid/profile/worktreePath 墓碑要等本机清理跑完（成功指派后）才落盘，
 * 见 handoffLocalTombstones —— 否则④/⑤失败回滚时本机字段已经被清空，
 * 用户会话恢复不了。
 */
export function handoffStartedStateExtra(attachmentId: number, from: string): Record<string, unknown> {
  return { handoffAttachmentId: String(attachmentId), handoffFrom: from }
}

/**
 * 本机墓碑：移交流程最后一步（本机清理跑完之后）才调用。worktree 删除失败时
 * 保留 worktreePath（keepWorktreePath），别把用户还留在磁盘上的 worktree
 * 从 state 里抹掉。
 */
export function handoffLocalTombstones(opts: { keepWorktreePath: boolean }): Record<string, string> {
  const extra: Record<string, string> = {}
  for (const f of LOCAL_STATE_FIELDS) {
    if (f === 'worktreePath' && opts.keepWorktreePath)
      continue
    extra[f] = ''
  }
  return extra
}

export function handoffStartedUiPatch(attachmentId: number, from: string, to: string, opts: { keepWorktreePath: boolean }): Record<string, unknown> {
  return {
    handoffAttachmentId: String(attachmentId),
    handoffFrom: from,
    assignees: [to],
    sessionId: null,
    implementSessionId: null,
    reviewSessionId: null,
    testSessionId: null,
    prototypeSessionId: null,
    profilePath: null,
    brainstormProfilePath: null,
    testProfilePath: null,
    prototypeProfilePath: null,
    prDiffFile: null,
    // worktree 没删掉时（opts.keepWorktreePath）不碰这两个字段，让 UI 继续显示孤儿 worktree。
    ...(opts.keepWorktreePath ? {} : { worktreePath: null, worktreeExists: false }),
  }
}

function definedEntries(o: Record<string, any>): Record<string, string> {
  const out: Record<string, string> = {}
  for (const [k, v] of Object.entries(o)) {
    if (v)
      out[k] = v
  }
  return out
}

export function handoffAcceptedStateExtra(local: {
  sessions: HandoffSessions
  profiles: HandoffProfiles
  worktreePath?: string
}): Record<string, unknown> {
  return {
    handoffAttachmentId: '',
    handoffFrom: '',
    ...definedEntries(local.sessions),
    ...definedEntries(local.profiles),
    ...(local.worktreePath ? { worktreePath: local.worktreePath } : {}),
  }
}

export function handoffAcceptedUiPatch(local: {
  sessions: HandoffSessions
  profiles: HandoffProfiles
  worktreePath?: string
  worktreeExists: boolean
  reviewSessionFileExists?: boolean
}): Record<string, unknown> {
  return {
    handoffAttachmentId: null,
    handoffFrom: null,
    ...definedEntries(local.sessions),
    ...definedEntries(local.profiles),
    // 显式 null 而非省略：省略会让 webview 侧留着接管前的旧 worktreePath，
    // 与 worktreeExists: false 对不上。
    worktreePath: local.worktreePath ?? null,
    worktreeExists: local.worktreeExists,
    ...(local.reviewSessionFileExists !== undefined ? { reviewSessionFileExists: local.reviewSessionFileExists } : {}),
  }
}