export type WorkReviewDecision = 'approved' | 'revision_required'
export type WorkReviewReviewerRole = 'manager' | 'final_reviewer'

export type NormalizedWorkReviewAnnotation = {
  id: string
  x: number
  y: number
  x2?: number
  y2?: number
  shape?: 'point' | 'rectangle' | 'ellipse' | 'arrow'
  color?: string
  comment: string
}

export type WorkReviewAnnotationValidationResult =
  | { ok: true; annotations: NormalizedWorkReviewAnnotation[] }
  | { ok: false; error: string }

const WORK_REVIEW_ANNOTATION_LIMIT = 50
const WORK_REVIEW_ANNOTATION_COMMENT_LIMIT = 1000
const WORK_REVIEW_ANNOTATION_SHAPES = new Set(['point', 'rectangle', 'ellipse', 'arrow'])
const WORK_REVIEW_ANNOTATION_COLORS = new Set([
  '#0050cb',
  '#d92d20',
  '#087a3c',
  '#8a5200',
  '#101828',
  '#ffffff',
])

function normalizedCoordinate(value: unknown) {
  return typeof value === 'number' && Number.isFinite(value) && value >= 0 && value <= 1
    ? Math.round(value * 1_000_000) / 1_000_000
    : null
}

export function validateWorkReviewAnnotations(value: unknown): WorkReviewAnnotationValidationResult {
  if (value == null) return { ok: true, annotations: [] }
  if (!Array.isArray(value)) return { ok: false, error: '图片批注格式无效' }
  if (value.length > WORK_REVIEW_ANNOTATION_LIMIT) {
    return { ok: false, error: `单张图片最多添加 ${WORK_REVIEW_ANNOTATION_LIMIT} 个批注` }
  }

  const ids = new Set<string>()
  const annotations: NormalizedWorkReviewAnnotation[] = []
  for (const raw of value) {
    if (!raw || typeof raw !== 'object' || Array.isArray(raw)) {
      return { ok: false, error: '图片批注格式无效' }
    }
    const item = raw as Record<string, unknown>
    const id = String(item.id ?? '').trim()
    const x = normalizedCoordinate(item.x)
    const y = normalizedCoordinate(item.y)
    const shape = item.shape == null ? undefined : String(item.shape).trim().toLowerCase()
    const color = item.color == null ? undefined : String(item.color).trim().toLowerCase()
    const x2 = item.x2 == null ? undefined : normalizedCoordinate(item.x2)
    const y2 = item.y2 == null ? undefined : normalizedCoordinate(item.y2)
    const comment = String(item.comment ?? '').trim()
    if (!id || id.length > 64 || ids.has(id)) {
      return { ok: false, error: '图片批注编号无效或重复' }
    }
    if (x == null || y == null) {
      return { ok: false, error: '图片批注位置无效' }
    }
    if ((item.x2 != null && x2 == null) || (item.y2 != null && y2 == null)) {
      return { ok: false, error: '图片框选范围无效' }
    }
    if (shape != null && !WORK_REVIEW_ANNOTATION_SHAPES.has(shape)) {
      return { ok: false, error: '图片批注形状无效' }
    }
    if (color != null && !WORK_REVIEW_ANNOTATION_COLORS.has(color)) {
      return { ok: false, error: '图片批注颜色无效' }
    }
    if (shape && shape !== 'point' && (x2 == null || y2 == null)) {
      return { ok: false, error: '图片框选范围无效' }
    }
    if (!comment) return { ok: false, error: '请填写每个标注点的修改意见' }
    if (comment.length > WORK_REVIEW_ANNOTATION_COMMENT_LIMIT) {
      return { ok: false, error: `单个标注点的修改意见不能超过 ${WORK_REVIEW_ANNOTATION_COMMENT_LIMIT} 个字` }
    }
    ids.add(id)
    annotations.push({
      id,
      x,
      y,
      ...(x2 == null ? {} : { x2 }),
      ...(y2 == null ? {} : { y2 }),
      ...(shape == null ? {} : { shape: shape as NormalizedWorkReviewAnnotation['shape'] }),
      ...(color == null ? {} : { color }),
      comment,
    })
  }
  return { ok: true, annotations }
}

type WorkReviewEmployeeIdentity = {
  id?: unknown
  dingtalkUserId?: unknown
  dingEmail?: unknown
  jobNumber?: unknown
  flowerName?: unknown
  realName?: unknown
  displayName?: unknown
  sourcePayload?: unknown
}

function normalizeIdentityValue(value: unknown) {
  const normalized = String(value ?? '').trim().toLowerCase()
  return normalized || null
}

function normalizeEmployeeAlias(value: unknown) {
  const normalized = String(value ?? '')
    .normalize('NFKC')
    .trim()
    .toLowerCase()
    .replace(/\s+/g, '')
    .replace(/無/g, '无')
  return normalized || null
}

export function getWorkReviewEmployeeMaterialUserIds(employee: WorkReviewEmployeeIdentity | null | undefined) {
  const payload = employee?.sourcePayload
  if (!payload || typeof payload !== 'object' || Array.isArray(payload)) return []
  const record = payload as Record<string, unknown>
  return Array.from(new Set([
    normalizeIdentityValue(record.materialUserId),
    normalizeIdentityValue(record.userId),
  ].filter((value): value is string => Boolean(value))))
}

export function getWorkReviewEmployeeIdentityKeys(employee: WorkReviewEmployeeIdentity | null | undefined) {
  if (!employee) return []
  const payload = employee.sourcePayload
  const materialEmail = payload && typeof payload === 'object' && !Array.isArray(payload)
    ? normalizeIdentityValue((payload as Record<string, unknown>).materialUserEmail)
    : null
  const values = [
    ['profile', normalizeIdentityValue(employee.id)],
    ['dingtalk', normalizeIdentityValue(employee.dingtalkUserId)],
    ['email', normalizeIdentityValue(employee.dingEmail)],
    ['job', normalizeIdentityValue(employee.jobNumber)],
    ['email', materialEmail],
    ...getWorkReviewEmployeeMaterialUserIds(employee).map((value) => ['user', value]),
  ] as Array<[string, string | null]>
  return Array.from(new Set(values.flatMap(([type, value]) => value ? [`${type}:${value}`] : [])))
}

export function getWorkReviewEmployeeAliasKeys(employee: WorkReviewEmployeeIdentity | null | undefined) {
  if (!employee) return []
  return Array.from(new Set([
    normalizeEmployeeAlias(employee.flowerName),
    normalizeEmployeeAlias(employee.displayName),
    normalizeEmployeeAlias(employee.realName),
  ].filter((value): value is string => Boolean(value))))
}

export function isSameWorkReviewEmployeeIdentity(
  left: WorkReviewEmployeeIdentity | null | undefined,
  right: WorkReviewEmployeeIdentity | null | undefined,
) {
  const leftKeys = new Set(getWorkReviewEmployeeIdentityKeys(left))
  return getWorkReviewEmployeeIdentityKeys(right).some((key) => leftKeys.has(key))
}

export function isSameWorkReviewEmployeeAlias(
  left: WorkReviewEmployeeIdentity | null | undefined,
  right: WorkReviewEmployeeIdentity | null | undefined,
) {
  const leftAliases = new Set(getWorkReviewEmployeeAliasKeys(left))
  return getWorkReviewEmployeeAliasKeys(right).some((alias) => leftAliases.has(alias))
}

export function canSubmitWorkReview(employee: unknown) {
  return Boolean(employee)
}

export function canDeleteWorkReviewProject(user: { username?: unknown } | null | undefined) {
  const username = String(user?.username ?? '').trim().toLowerCase()
  return username === 'wuxie' || username === '无邪'
}

export function getWorkReviewReviewerSelectionError(input: {
  reviewerEmployeeId: string | null
  submitterEmployeeId: string
  finalReviewerEmployeeId: string
}) {
  if (!input.reviewerEmployeeId) return '请选择评审人'
  if (input.reviewerEmployeeId === input.submitterEmployeeId) {
    return '评审人不能选择自己，请选择其他人员'
  }
  if (input.reviewerEmployeeId === input.finalReviewerEmployeeId) {
    return '元泽已是固定评审人，请选择另一名评审人'
  }
  return null
}

export function deriveWorkReviewDecision(
  decisions: ReadonlyArray<{ decision: WorkReviewDecision }>,
): WorkReviewDecision {
  return decisions.some((item) => item.decision === 'revision_required')
    ? 'revision_required'
    : 'approved'
}

export function deriveCompletedWorkReviewStatus(
  reviews: ReadonlyArray<{
    reviewerRole: string
    decision: WorkReviewDecision
  }>,
  requiredRoles: ReadonlyArray<WorkReviewReviewerRole> = ['manager', 'final_reviewer'],
): WorkReviewDecision | null {
  const requiredReviews = requiredRoles.map((role) => (
    reviews.find((review) => review.reviewerRole === role)
  ))
  if (requiredReviews.some((review) => !review)) return null
  return deriveWorkReviewDecision(requiredReviews as Array<{ decision: WorkReviewDecision }>)
}

export function canResubmitWorkReviewProject(project: {
  status: string
  versions: ReadonlyArray<{ status: string }>
  permissions: { canResubmit: boolean }
}) {
  const latestVersion = project.versions[0]
  return Boolean(
    latestVersion
    && project.permissions.canResubmit
    && project.status === 'revision_required'
    && latestVersion.status === 'revision_required',
  )
}