import dayjs from 'dayjs';

export type WorkbenchTrend = 'up' | 'down' | 'flat';

export type WorkbenchTodoCategory = 'review' | 'task' | 'ticket' | 'mention';

export type WorkbenchTodoTimeBucket = 'all' | 'today' | 'week' | 'overdue';

export type WorkbenchProjectStatus = 'active' | 'preview' | 'paused';

export interface WorkbenchBannerSummarySource {
  /** 今日待办数 */
  todoCount: number;
  /** 即将到期数（今日/明日内截止） */
  upcomingCount: number;
  /** 本周已完成 */
  weekDone: number;
  /** 本周总量 */
  weekTotal: number;
  /** 本周进行中 */
  weekInProgress: number;
  /** 本周逾期 */
  weekOverdue: number;
}

export interface WorkbenchBannerSummary {
  todoCount: number;
  upcomingCount: number;
  weekDone: number;
  weekTotal: number;
  weekInProgress: number;
  weekOverdue: number;
  /** 完成率（0-100 整数） */
  weekCompletionRate: number;
}

export interface WorkbenchKpiSource {
  /** 待办 */
  todo: {
    count: number;
    diffFromYesterday: number;
  };
  /** 我负责的任务 */
  task: {
    count: number;
    diffFromYesterday: number;
  };
  /** 我参与的项目 */
  project: {
    count: number;
    activeCount: number;
  };
  /** 我负责的需求 */
  requirement: {
    count: number;
    pendingReview: number;
  };
}

export interface WorkbenchKpiCard {
  key: 'todo' | 'task' | 'project' | 'requirement';
  label: string;
  value: number;
  trend: WorkbenchTrend;
  trendText: string;
  hint: string;
  icon: string;
  tone: 'sky' | 'emerald' | 'amber' | 'rose';
}

export interface WorkbenchTodoItemSource {
  id: string;
  category: WorkbenchTodoCategory;
  title: string;
  /** 截止时间，ISO 字符串 */
  deadline: string | null;
  /** 来源（提交人/项目名/工单号） */
  source: string;
  /** 是否逾期 */
  overdue?: boolean;
  /** 是否高优先级 */
  highPriority?: boolean;
  /** 跳转路由 key（可选，未配则不跳转） */
  routeKey?: string;
}

export interface WorkbenchTodoItem extends Omit<WorkbenchTodoItemSource, 'deadline'> {
  deadlineLabel: string;
  /** 相对截止天数：负数表示已逾期 */
  remainingDays: number | null;
  categoryLabel: string;
  categoryTone: 'sky' | 'emerald' | 'amber' | 'rose' | 'violet';
}

export interface WorkbenchActivityItemSource {
  id: string;
  actor: string;
  action: string;
  /** 目标对象（需求/任务/工单/项目名等） */
  target: string;
  /** 目标对象的种类，用于颜色 */
  targetKind: 'requirement' | 'task' | 'ticket' | 'project' | 'product';
  /** 时间，ISO */
  time: string;
  /** 是否 @ 了当前用户 */
  mentioned?: boolean;
}

export interface WorkbenchActivityItem extends Omit<WorkbenchActivityItemSource, 'time'> {
  timeLabel: string;
  relativeLabel: string;
  tone: 'sky' | 'emerald' | 'amber' | 'rose' | 'violet';
}

export interface WorkbenchProjectItemSource {
  id: string;
  name: string;
  code: string;
  status: WorkbenchProjectStatus;
  /** 我的角色 */
  myRole: string;
  /** 进度百分比 0-100 */
  progress: number;
  /** 我负责的任务数 */
  myTaskCount: number;
  /** 我负责的待处理任务数 */
  myPendingTaskCount: number;
  /** 最近活动时间，ISO */
  lastActiveTime: string;
}

export interface WorkbenchProjectItem extends Omit<WorkbenchProjectItemSource, 'lastActiveTime'> {
  statusLabel: string;
  statusTone: 'sky' | 'emerald' | 'amber';
  progress: number;
  lastActiveLabel: string;
}

const todoCategoryMeta: Record<
  WorkbenchTodoCategory,
  { label: string; tone: WorkbenchTodoItem['categoryTone']; icon: string }
> = {
  review: { label: '需求评审', tone: 'sky', icon: 'mdi:file-search-outline' },
  task: { label: '任务', tone: 'emerald', icon: 'mdi:checkbox-marked-circle-outline' },
  ticket: { label: '工单', tone: 'amber', icon: 'mdi:ticket-confirmation-outline' },
  mention: { label: '@ 提及', tone: 'violet', icon: 'mdi:at' }
};

const activityToneMap: Record<WorkbenchActivityItemSource['targetKind'], WorkbenchActivityItem['tone']> = {
  requirement: 'sky',
  task: 'emerald',
  ticket: 'amber',
  project: 'violet',
  product: 'rose'
};

const projectStatusMeta: Record<WorkbenchProjectStatus, { label: string; tone: WorkbenchProjectItem['statusTone'] }> = {
  active: { label: '进行中', tone: 'emerald' },
  preview: { label: '试运行', tone: 'sky' },
  paused: { label: '已暂停', tone: 'amber' }
};

function clampPercent(value: number) {
  if (!Number.isFinite(value)) return 0;
  return Math.min(100, Math.max(0, Math.round(value)));
}

function formatRelative(value: string) {
  const target = dayjs(value);
  if (!target.isValid()) return '--';

  const now = dayjs();
  const diffMinutes = now.diff(target, 'minute');

  if (diffMinutes < 1) return '刚刚';
  if (diffMinutes < 60) return `${diffMinutes} 分钟前`;

  const diffHours = now.diff(target, 'hour');
  if (diffHours < 24) return `${diffHours} 小时前`;

  const diffDays = now.diff(target, 'day');
  if (diffDays < 7) return `${diffDays} 天前`;

  return target.format('MM-DD HH:mm');
}

function formatDeadline(value: string | null) {
  if (!value) return '不限';
  const target = dayjs(value);
  if (!target.isValid()) return '不限';

  const now = dayjs().startOf('day');
  const start = target.startOf('day');
  const days = start.diff(now, 'day');

  if (days === 0) return `今日 ${target.format('HH:mm')}`;
  if (days === 1) return `明日 ${target.format('HH:mm')}`;
  if (days === -1) return `昨日 ${target.format('HH:mm')}`;
  if (days > 0 && days <= 7) return `${days} 天后 ${target.format('MM-DD')}`;
  if (days < 0) return `逾期 ${Math.abs(days)} 天`;
  return target.format('YYYY-MM-DD');
}

function getRemainingDays(value: string | null) {
  if (!value) return null;
  const target = dayjs(value);
  if (!target.isValid()) return null;

  return target.startOf('day').diff(dayjs().startOf('day'), 'day');
}

export function buildWorkbenchBannerSummary(source: WorkbenchBannerSummarySource): WorkbenchBannerSummary {
  const total = Math.max(0, source.weekTotal);
  const done = Math.max(0, source.weekDone);
  const rate = total === 0 ? 0 : clampPercent((done / total) * 100);

  return {
    todoCount: Math.max(0, source.todoCount),
    upcomingCount: Math.max(0, source.upcomingCount),
    weekDone: done,
    weekTotal: total,
    weekInProgress: Math.max(0, source.weekInProgress),
    weekOverdue: Math.max(0, source.weekOverdue),
    weekCompletionRate: rate
  };
}

export function buildWorkbenchKpiCards(source: WorkbenchKpiSource): WorkbenchKpiCard[] {
  function diffTrend(diff: number): { trend: WorkbenchTrend; text: string } {
    if (diff > 0) return { trend: 'up', text: `较昨日 +${diff}` };
    if (diff < 0) return { trend: 'down', text: `较昨日 ${diff}` };
    return { trend: 'flat', text: '与昨日持平' };
  }

  const todoTrend = diffTrend(source.todo.diffFromYesterday);
  const taskTrend = diffTrend(source.task.diffFromYesterday);

  return [
    {
      key: 'todo',
      label: '我的待办',
      value: source.todo.count,
      trend: todoTrend.trend,
      trendText: todoTrend.text,
      hint: '需要我处理的评审、任务、工单与 @ 提醒合计',
      icon: 'mdi:clipboard-text-clock-outline',
      tone: 'sky'
    },
    {
      key: 'task',
      label: '我负责的任务',
      value: source.task.count,
      trend: taskTrend.trend,
      trendText: taskTrend.text,
      hint: '当前由我负责的进行中任务',
      icon: 'mdi:checkbox-marked-circle-outline',
      tone: 'emerald'
    },
    {
      key: 'project',
      label: '我参与的项目',
      value: source.project.count,
      trend: 'flat',
      trendText: `进行中 ${source.project.activeCount} 个`,
      hint: '我作为成员参与的项目总数',
      icon: 'mdi:briefcase-outline',
      tone: 'amber'
    },
    {
      key: 'requirement',
      label: '我负责的需求',
      value: source.requirement.count,
      trend: 'flat',
      trendText: `待评审 ${source.requirement.pendingReview} 项`,
      hint: '由我担任产品经理或负责人的需求',
      icon: 'mdi:file-document-multiple-outline',
      tone: 'rose'
    }
  ];
}

export function buildWorkbenchTodoItems(source: readonly WorkbenchTodoItemSource[]): WorkbenchTodoItem[] {
  return [...source]
    .sort((left, right) => {
      const leftValue = left.deadline ? dayjs(left.deadline).valueOf() : Number.POSITIVE_INFINITY;
      const rightValue = right.deadline ? dayjs(right.deadline).valueOf() : Number.POSITIVE_INFINITY;
      return leftValue - rightValue;
    })
    .map(item => {
      const meta = todoCategoryMeta[item.category];
      return {
        ...item,
        deadlineLabel: formatDeadline(item.deadline),
        remainingDays: getRemainingDays(item.deadline),
        categoryLabel: meta.label,
        categoryTone: meta.tone
      } satisfies WorkbenchTodoItem;
    });
}

export function filterWorkbenchTodoItems(items: readonly WorkbenchTodoItem[], bucket: WorkbenchTodoTimeBucket) {
  if (bucket === 'all') return [...items];
  if (bucket === 'overdue') return items.filter(item => item.remainingDays !== null && item.remainingDays < 0);
  if (bucket === 'today') return items.filter(item => item.remainingDays === 0);
  // bucket === 'week'
  return items.filter(item => item.remainingDays !== null && item.remainingDays >= 0 && item.remainingDays <= 7);
}

export function buildWorkbenchActivityItems(source: readonly WorkbenchActivityItemSource[]): WorkbenchActivityItem[] {
  return [...source]
    .filter(item => dayjs(item.time).isValid())
    .sort((left, right) => dayjs(right.time).valueOf() - dayjs(left.time).valueOf())
    .map(item => ({
      ...item,
      timeLabel: dayjs(item.time).format('YYYY-MM-DD HH:mm'),
      relativeLabel: formatRelative(item.time),
      tone: activityToneMap[item.targetKind]
    }));
}

export function buildWorkbenchProjectItems(source: readonly WorkbenchProjectItemSource[]): WorkbenchProjectItem[] {
  return source.map(item => {
    const meta = projectStatusMeta[item.status];
    return {
      ...item,
      statusLabel: meta.label,
      statusTone: meta.tone,
      progress: clampPercent(item.progress),
      lastActiveLabel: formatRelative(item.lastActiveTime)
    } satisfies WorkbenchProjectItem;
  });
}

export function getGreeting(hour: number = dayjs().hour()) {
  if (hour < 6) return '凌晨好';
  if (hour < 11) return '早上好';
  if (hour < 13) return '中午好';
  if (hour < 18) return '下午好';
  if (hour < 22) return '晚上好';
  return '夜深了';
}

export function getTodayLabel() {
  const today = dayjs();
  const weekdayMap = ['日', '一', '二', '三', '四', '五', '六'];
  return `今天 ${today.format('YYYY-MM-DD')} 星期${weekdayMap[today.day()]}`;
}