import type { ChangedFile, MergeMethod, PullState, ReviewState, ReviewerState, UserDto } from '@/entities/pull-request'
import type { DiffFile, DiffFileStatus } from '@/entities/repo'

/** UI-only filter: the backend understands open/closed/merged and no filter. */
export type PullFilter = PullState | 'all' | 'draft'

export const PULL_STATE_LABEL: Record<PullState, string> = {
  open: '待合并',
  closed: '已关闭',
  merged: '已合并',
}

/** tailwind-ish tone classes shared across badges (mirrors repo-history colors). */
export const TONE = {
  green: 'text-[#1a7f37] bg-[rgba(35,165,90,0.12)]',
  red: 'text-[#b42318] bg-[rgba(242,63,67,0.10)]',
  amber: 'text-[#8a6100] bg-[rgba(240,178,50,0.16)]',
  violet: 'text-[#6937c3] bg-[rgba(120,82,196,0.12)]',
  gray: 'text-shell-ink-muted bg-shell-active',
} as const

export const REVIEW_STATE_LABEL: Record<ReviewState, string> = {
  approved: '已批准',
  changes_requested: '请求修改',
  commented: '评论',
  pending: '待提交',
  dismissed: '已撤销',
}

export const REVIEW_STATE_TONE: Record<ReviewState, keyof typeof TONE> = {
  approved: 'green',
  changes_requested: 'red',
  commented: 'gray',
  pending: 'amber',
  dismissed: 'gray',
}

export const REVIEWER_STATE_LABEL: Record<ReviewerState, string> = {
  requested: '待评审',
  approved: '已批准',
  changes_requested: '请求修改',
  commented: '已评论',
  dismissed: '已撤销',
}

export const MERGE_METHOD_LABEL: Record<MergeMethod, string> = {
  merge: '普通合并',
  squash: '压缩合并',
  rebase: '变基合并',
}

/** The backend formats status with `{:?}` (Debug names) — normalize loosely. */
export function normalizeFileStatus(raw: string): DiffFileStatus {
  const s = raw.toLowerCase()
  if (s.startsWith('ad') || s.startsWith('new') || s.startsWith('creat') || s === 'a') return 'added'
  if (s.startsWith('del') || s.startsWith('rem') || s === 'd') return 'deleted'
  if (s.startsWith('ren') || s.startsWith('mov') || s === 'r') return 'renamed'
  if (s.startsWith('cop') || s === 'c') return 'copied'
  if (s.startsWith('bin')) return 'binary'
  return 'modified'
}

const EVENT_LABEL: Record<string, string> = {
  created: '创建了本合并请求',
  updated: '更新了合并请求',
  title_changed: '修改了标题',
  body_edited: '编辑了描述',
  base_changed: '改动了目标分支',
  marked_ready: '转为正式合并请求',
  marked_draft: '转为草稿',
  closed: '关闭了合并请求',
  reopened: '重新打开了合并请求',
  merged: '合并了本合并请求',
  review_requested: '请求了评审',
  review_request_removed: '移除了评审请求',
  review_submitted: '提交了评审',
  approved: '批准了本合并请求',
  changes_requested: '请求修改',
  comment: '发表了评论',
  labeled: '添加了标签',
  unlabeled: '移除了标签',
  assigned: '添加了受理人',
  unassigned: '移除了受理人',
  locked: '锁定了讨论',
  unlocked: '解锁了讨论',
  force_push: '向源分支强推了提交',
  branch_updated: '同步了目标分支',
  head_ref_updated: '更新了源分支',
  auto_merge_enabled: '开启了自动合并',
  auto_merge_disabled: '关闭了自动合并',
}

export const eventLabel = (eventType: string): string =>
  EVENT_LABEL[eventType] ?? eventType.replaceAll('_', ' ')

export const userName = (user?: UserDto | null): string =>
  user?.display_name || user?.username || '未知用户'

export interface InlineAnchor {
  path: string
  line: number
  side: 'left' | 'right'
}

export const anchorKey = (path: string, line: number, side: 'left' | 'right') => `${path}#${side}${line}`

/** A pinned inline comment as rendered under its diff line. */
export interface AnchoredComment {
  id: string
  body: string
}

export function changedFileToDiff(file: ChangedFile): DiffFile {
  const status = file.binary ? 'binary' : normalizeFileStatus(file.path.status)
  return {
    path: file.path.new_path,
    oldPath: file.path.old_path && file.path.old_path !== file.path.new_path ? file.path.old_path : null,
    status,
    raw: file.patch ?? '',
    additions: file.lines_added,
    deletions: file.lines_removed,
  }
}