"use client";

import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Progress } from "@/components/ui/progress";
import { Badge } from "@/components/ui/badge";
import { 
  Users, 
  MessageSquare, 
  Calendar, 
  FolderOpen,
  Clock,
  CheckCircle,
  AlertTriangle,
  TrendingUp,
  Activity,
  Target
} from "lucide-react";
import { formatDistanceToNow } from "date-fns";

interface WorkspaceStatsProps {
  tasks: any[];
  projects: any[];
  members: any[];
}

export const WorkspaceProjectStats = ({ tasks, projects, members }: WorkspaceStatsProps) => {
  // Project distribution
  const tasksPerProject = projects.map(project => ({
    name: project.name,
    taskCount: tasks.filter(task => task.projectId === project.id).length
  }));

  const unassignedToProject = tasks.filter(task => !task.projectId).length;
  const totalTasks = tasks.length;

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2">
          <FolderOpen className="h-5 w-5" />
          Project Distribution
        </CardTitle>
        <p className="text-sm text-muted-foreground">
          How tasks are distributed across your projects
        </p>
      </CardHeader>
      <CardContent>
        <div className="space-y-3">
          {tasksPerProject
            .filter(project => project.taskCount > 0)
            .sort((a, b) => b.taskCount - a.taskCount)
            .slice(0, 5)
            .map((project) => (
              <div key={project.name} className="flex items-center justify-between">
                <div className="flex items-center gap-2 min-w-0 flex-1">
                  <div className="w-3 h-3 bg-muted-foreground rounded-full flex-shrink-0"></div>
                  <span className="text-sm font-medium truncate">{project.name}</span>
                </div>
                <div className="flex items-center gap-2 flex-shrink-0">
                  <Progress 
                    value={totalTasks > 0 ? (project.taskCount / totalTasks) * 100 : 0} 
                    className="w-16" 
                  />
                  <span className="text-sm font-medium w-8 text-right">
                    {project.taskCount}
                  </span>
                </div>
              </div>
            ))}
          
          {unassignedToProject > 0 && (
            <div className="flex items-center justify-between">
              <div className="flex items-center gap-2 min-w-0 flex-1">
                <div className="w-3 h-3 bg-muted-foreground/50 rounded-full flex-shrink-0"></div>
                <span className="text-sm font-medium text-muted-foreground">Unassigned</span>
              </div>
              <div className="flex items-center gap-2 flex-shrink-0">
                <Progress 
                  value={totalTasks > 0 ? (unassignedToProject / totalTasks) * 100 : 0} 
                  className="w-16" 
                />
                <span className="text-sm font-medium w-8 text-right">
                  {unassignedToProject}
                </span>
              </div>
            </div>
          )}

          {totalTasks === 0 && (
            <div className="text-center py-4 text-muted-foreground">
              <FolderOpen className="h-6 w-6 mx-auto mb-2 opacity-50" />
              <p className="text-sm">No tasks found</p>
            </div>
          )}
        </div>
      </CardContent>
    </Card>
  );
};

export const WorkspaceDueDateStats = ({ tasks }: { tasks: any[] }) => {
  const now = new Date();
  const nextWeek = new Date(now.getTime() + 7 * 24 * 60 * 60 * 1000);

  const overdueTasks = tasks.filter(task => 
    task.dueDate && new Date(task.dueDate) < now && task.status !== 'DONE'
  ).length;

  const dueSoonTasks = tasks.filter(task => 
    task.dueDate && 
    new Date(task.dueDate) >= now && 
    new Date(task.dueDate) <= nextWeek &&
    task.status !== 'DONE'
  ).length;

  const noDueDateTasks = tasks.filter(task => !task.dueDate && task.status !== 'DONE').length;
  const activeTasks = tasks.filter(task => task.status !== 'DONE').length;

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2">
          <Calendar className="h-5 w-5" />
          Due Date Analysis
        </CardTitle>
        <p className="text-sm text-muted-foreground">
          Track deadlines and time management
        </p>
      </CardHeader>
      <CardContent>
        <div className="space-y-4">
          <div className="grid grid-cols-2 gap-4">
            <div className="text-center p-3 bg-red-50 rounded-lg border border-red-200">
              <div className="flex items-center justify-center mb-1">
                <AlertTriangle className="h-4 w-4 text-red-600 mr-1" />
                <span className="text-2xl font-bold text-red-600">{overdueTasks}</span>
              </div>
              <p className="text-xs text-red-700 font-medium">Overdue</p>
            </div>
            
            <div className="text-center p-3 bg-yellow-50 rounded-lg border border-yellow-200">
              <div className="flex items-center justify-center mb-1">
                <Clock className="h-4 w-4 text-yellow-600 mr-1" />
                <span className="text-2xl font-bold text-yellow-600">{dueSoonTasks}</span>
              </div>
              <p className="text-xs text-yellow-700 font-medium">Due Soon</p>
            </div>
          </div>

          <div className="space-y-2">
            <div className="flex items-center justify-between">
              <span className="text-sm font-medium">No Due Date</span>
              <div className="flex items-center gap-2">
                <span className="text-sm font-bold">{noDueDateTasks}</span>
                <span className="text-xs text-muted-foreground">
                  ({activeTasks > 0 ? Math.round((noDueDateTasks / activeTasks) * 100) : 0}%)
                </span>
              </div>
            </div>
            <Progress 
              value={activeTasks > 0 ? (noDueDateTasks / activeTasks) * 100 : 0} 
              className="h-2" 
            />
          </div>
        </div>
      </CardContent>
    </Card>
  );
};

interface WorkspaceCommunicationStatsProps {
  analytics: {
    totalComments: number;
    thisMonthComments: number;
    commentsDifference: number;
    tasksWithComments: number;
    totalTasksInWorkspace: number;
    avgCommentsPerTask: number;
  } | null;
}

export const WorkspaceCommunicationStats = ({ analytics }: WorkspaceCommunicationStatsProps) => {
  if (!analytics) {
    return (
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <MessageSquare className="h-5 w-5" />
            Communication Activity
          </CardTitle>
          <p className="text-sm text-muted-foreground">
            Track collaboration and engagement
          </p>
        </CardHeader>
        <CardContent>
          <div className="text-center py-4 text-muted-foreground">
            <MessageSquare className="h-6 w-6 mx-auto mb-2 opacity-50" />
            <p className="text-sm">Loading...</p>
          </div>
        </CardContent>
      </Card>
    );
  }

  const { 
    totalComments, 
    thisMonthComments,
    commentsDifference,
    tasksWithComments, 
    totalTasksInWorkspace, 
    avgCommentsPerTask 
  } = analytics;

  const tasksWithCommentsPercentage = totalTasksInWorkspace > 0 
    ? Math.round((tasksWithComments / totalTasksInWorkspace) * 100) 
    : 0;

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2">
          <MessageSquare className="h-5 w-5" />
          Communication Activity
        </CardTitle>
        <p className="text-sm text-muted-foreground">
          Track collaboration and engagement
        </p>
      </CardHeader>
      <CardContent>
        <div className="space-y-4">
          <div className="grid grid-cols-2 gap-4">
            <div className="text-center p-3 bg-blue-50 rounded-lg border border-blue-200">
              <div className="text-2xl font-bold text-blue-600">{totalComments}</div>
              <p className="text-xs text-blue-700 font-medium">Total Comments</p>
              {commentsDifference !== 0 && (
                <div className={`text-xs mt-1 ${commentsDifference > 0 ? 'text-green-600' : 'text-red-600'}`}>
                  {commentsDifference > 0 ? '+' : ''}{commentsDifference} this month
                </div>
              )}
            </div>
            
            <div className="text-center p-3 bg-green-50 rounded-lg border border-green-200">
              <div className="text-2xl font-bold text-green-600">{avgCommentsPerTask}</div>
              <p className="text-xs text-green-700 font-medium">Avg per Task</p>
            </div>
          </div>

          <div className="space-y-2">
            <div className="flex items-center justify-between">
              <span className="text-sm font-medium">Tasks with Comments</span>
              <div className="flex items-center gap-2">
                <span className="text-sm font-bold">{tasksWithComments}</span>
                <span className="text-xs text-muted-foreground">
                  ({tasksWithCommentsPercentage}%)
                </span>
              </div>
            </div>
            <Progress 
              value={tasksWithCommentsPercentage} 
              className="h-2" 
            />
          </div>

          {totalComments === 0 && (
            <div className="text-center py-2 text-muted-foreground">
              <p className="text-xs">No comments yet. Start collaborating!</p>
            </div>
          )}
        </div>
      </CardContent>
    </Card>
  );
};

interface Epic {
  id: string;
  name: string;
  status: string;
  stats?: {
    totalTasks: number;
    completedTasks: number;
    progressPercentage: number;
  };
}

interface EpicStatsProps {
  epics: Epic[];
}

export const EpicStats = ({ epics }: EpicStatsProps) => {
  const totalEpics = epics.length;
  const completedEpics = epics.filter(epic => epic.status === "DONE").length;
  const inProgressEpics = epics.filter(epic => epic.status === "IN_PROGRESS").length;
  const overallProgress = totalEpics > 0 ? Math.round((completedEpics / totalEpics) * 100) : 0;

  const totalTasks = epics.reduce((sum, epic) => sum + (epic.stats?.totalTasks || 0), 0);
  const completedTasks = epics.reduce((sum, epic) => sum + (epic.stats?.completedTasks || 0), 0);
  const taskProgress = totalTasks > 0 ? Math.round((completedTasks / totalTasks) * 100) : 0;

  return (
    <Card>
      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
        <CardTitle className="text-sm font-medium">Epic Progress</CardTitle>
        <Target className="h-4 w-4 text-muted-foreground" />
      </CardHeader>
      <CardContent>
        <div className="space-y-4">
          <div>
            <div className="flex items-center justify-between text-xs mb-2">
              <span className="text-muted-foreground">Epic Completion</span>
              <span className="font-medium">{completedEpics}/{totalEpics} epics</span>
            </div>
            <Progress value={overallProgress} className="h-2" />
            <div className="text-xs text-muted-foreground mt-1">{overallProgress}% complete</div>
          </div>

          <div>
            <div className="flex items-center justify-between text-xs mb-2">
              <span className="text-muted-foreground">Overall Task Progress</span>
              <span className="font-medium">{completedTasks}/{totalTasks} tasks</span>
            </div>
            <Progress value={taskProgress} className="h-2" />
            <div className="text-xs text-muted-foreground mt-1">{taskProgress}% complete</div>
          </div>

          <div className="flex justify-between text-xs">
            <div className="flex items-center gap-1">
              <div className="w-2 h-2 bg-green-500 rounded-full"></div>
              <span>{completedEpics} Done</span>
            </div>
            <div className="flex items-center gap-1">
              <div className="w-2 h-2 bg-yellow-500 rounded-full"></div>
              <span>{inProgressEpics} In Progress</span>
            </div>
            <div className="flex items-center gap-1">
              <div className="w-2 h-2 bg-gray-400 rounded-full"></div>
              <span>{totalEpics - completedEpics - inProgressEpics} Remaining</span>
            </div>
          </div>
        </div>
      </CardContent>
    </Card>
  );
};