import type { TaskWorklog } from './task-worklog';
import type { WorkActivity, WorkActivityCategory } from './work-activity';
import type { WorkItem } from './workspace-engine';

export interface WorkspaceDailyReportItem {
  id: string;
  taskId: string;
  taskTitle: string;
  workContent: string;
  hours: number;
  createdAt: string;
  productName?: string;
  projectName?: string;
  versionName?: string;
}

export interface WorkspaceDailyReportActivityItem {
  id: string;
  sourceId: string;
  sourceType: WorkActivity['sourceType'];
  action: WorkActivity['action'];
  category: WorkActivityCategory;
  title: string;
  summary: string;
  occurredAt: string;
  context?: string;
  metadata?: WorkActivity['metadata'];
}

export interface WorkspaceDailyReportNeedsProgressItem {
  id: string;
  title: string;
  status: string;
  type: WorkItem['type'];
  context?: string;
}

export type WorkspaceDailyReportGroups = Record<WorkActivityCategory, WorkspaceDailyReportActivityItem[]>;

export interface WorkspaceDailyReport {
  date: string;
  totalHours: number;
  totalCount: number;
  items: WorkspaceDailyReportItem[];
  groups: WorkspaceDailyReportGroups;
  needsProgressItems: WorkspaceDailyReportNeedsProgressItem[];
}

interface GetWorkspaceDailyReportInput {
  activities?: WorkActivity[];
  worklogs: TaskWorklog[];
  workItems: WorkItem[];
  userId: string;
  date: string;
}

export function getWorkspaceDailyReport({
  activities = [],
  worklogs,
  workItems,
  userId,
  date,
}: GetWorkspaceDailyReportInput): WorkspaceDailyReport {
  const workItemMap = new Map(workItems.map((item) => [item.id, item]));

  const items = worklogs
    .filter((log) => log.userId === userId && log.date === date)
    .sort((a, b) => b.createdAt.localeCompare(a.createdAt))
    .map((log) => {
      const item = workItemMap.get(log.taskId);

      return {
        id: log.id,
        taskId: log.taskId,
        taskTitle: item?.title ?? '未知任务',
        workContent: log.workContent,
        hours: log.hours,
        createdAt: log.createdAt,
        productName: item?.productName,
        projectName: item?.projectName,
        versionName: item?.versionName,
      };
    });

  const dailyActivities = activities
    .filter((activity) => activity.actorId === userId && activity.date === date)
    .sort((a, b) => b.occurredAt.localeCompare(a.occurredAt));

  const groups = makeEmptyGroups();
  for (const activity of dailyActivities) {
    const item = workItemMap.get(activity.sourceId);
    groups[activity.category].push({
      id: activity.id,
      sourceId: activity.sourceId,
      sourceType: activity.sourceType,
      action: activity.action,
      category: activity.category,
      title: activity.title,
      summary: activity.summary,
      occurredAt: activity.occurredAt,
      context: getContext(item),
      metadata: activity.metadata,
    });
  }

  const touchedSourceIds = new Set([
    ...dailyActivities.map((activity) => activity.sourceId),
    ...items.map((item) => item.taskId),
  ]);

  const needsProgressItems = workItems
    .filter((item) => shouldRequireProgress(item, date, touchedSourceIds))
    .map((item) => ({
      id: item.id,
      title: item.title,
      status: item.status,
      type: item.type,
      context: getContext(item),
    }));

  return {
    date,
    totalHours: items.reduce((sum, item) => sum + item.hours, 0),
    totalCount: items.length + dailyActivities.length,
    items,
    groups,
    needsProgressItems,
  };
}

function makeEmptyGroups(): WorkspaceDailyReportGroups {
  return {
    delivery: [],
    progress: [],
    creation: [],
    risk: [],
    note: [],
  };
}

function getContext(item?: WorkItem): string | undefined {
  if (!item) return undefined;
  return [item.productName, item.projectName, item.versionName].filter(Boolean).join(' / ');
}

function shouldRequireProgress(item: WorkItem, date: string, touchedSourceIds: Set<string>): boolean {
  if (item.completed) return false;
  if (touchedSourceIds.has(item.id)) return false;
  if (!isInProgressStatus(item.status)) return false;

  const startedAt = getStartedAt(item);
  if (!startedAt) return false;
  return startedAt.slice(0, 10) < date;
}

function isInProgressStatus(status: string): boolean {
  return ['in_progress', 'testing', 'running', 'fixing', 'verifying'].includes(status);
}

function getStartedAt(item: WorkItem): string | undefined {
  const extra = item.extra ?? {};
  if (typeof extra.actualStartAt === 'string') return extra.actualStartAt;
  if (typeof extra.startedAt === 'string') return extra.startedAt;
  if (typeof extra.startTime === 'string') return extra.startTime;
  return undefined;
}