import React, { useState, useEffect } from "react";
import { TimeLog, timeLogApi } from "@/services/timeLogApi";
import { Employee, employeeApi } from "@/services/employeeApi";
import { format } from "date-fns";
import { Card, CardContent, CardHeader, CardTitle, CardDescription } from "@/components/ui/card";
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table";
import { Badge } from "@/components/ui/badge";
import { Clock, Loader2, User } from "lucide-react";
import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { useQuery } from "@tanstack/react-query";

interface TaskTimeLogCardProps {
  taskId: number;
  entityType?: "Task" | "Issue";
}

const TaskTimeLogCard: React.FC<TaskTimeLogCardProps> = ({ 
  taskId,
  entityType = "Task"
}) => {
  const [timeLogs, setTimeLogs] = useState<TimeLog[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  // Fetch employees data
  const { 
    data: employees = [], 
    isLoading: isLoadingEmployees 
  } = useQuery({
    queryKey: ["employees"],
    queryFn: () => employeeApi.getAll(),
  });

  useEffect(() => {
    const fetchTimeLogs = async () => {
      try {
        setIsLoading(true);
        setError(null);
        
        let logs: TimeLog[] = [];
        
        if (entityType === "Issue") {
          logs = await timeLogApi.getTimeLogByIssueID(taskId);
        } else {
          logs = await timeLogApi.getTimeLogByTaskID(taskId);
        }
        
        setTimeLogs(logs);
      } catch (err) {
        console.error(`Error fetching time logs for ${entityType}:`, err);
        setError(`Failed to load time logs for this ${entityType.toLowerCase()}. Please try again later.`);
      } finally {
        setIsLoading(false);
      }
    };

    if (taskId) {
      fetchTimeLogs();
    }
  }, [taskId, entityType]);

  // Format date for display
  const formatDate = (dateString: string) => {
    try {
      return format(new Date(dateString), "MMM dd, yyyy");
    } catch (error) {
      return "Invalid date";
    }
  };

  // Utility to strip HTML tags from text for tooltips
  const stripHtmlTags = (html: string): string => {
    const tempDiv = document.createElement('div');
    tempDiv.innerHTML = html;
    return tempDiv.textContent || tempDiv.innerText || '';
  };

  // Helper to get employee name by userId
  const getEmployeeNameByUserId = (userId: string): string => {
    const employee = employees.find(emp => emp.userId.toString() === userId);
    if (employee) {
      return `${employee.firstName} ${employee.lastName}`;
    }
    return userId;
  };

  // Calculate total hours spent
  const totalHoursSpent = timeLogs.reduce((total, log) => total + log.hrsSpent, 0);

  // Mobile view time log card
  const renderMobileTimeLog = (log: TimeLog) => (
    <div key={log.id} className="border rounded-md p-3 mb-2 text-sm">
      <div className="flex justify-between items-start mb-2">
        <Badge variant="outline" className="font-mono bg-indigo-50 text-indigo-700 border-indigo-200 px-2 py-0.5">
          {log.startTime} - {log.endTime}
        </Badge>
        <Badge variant="secondary" className="font-medium">
          {log.hrsSpent.toFixed(2)} hrs
        </Badge>
      </div>
      <div className="mb-2">
        <p className="text-xs text-muted-foreground mb-1">Date</p>
        <div className="flex items-center">
          <Clock className="h-3 w-3 text-muted-foreground mr-1" />
          <span>{formatDate(log.workDate)}</span>
        </div>
      </div>
      <div className="border-t pt-2 mt-2">
        <p className="text-xs text-muted-foreground mb-1">Comments</p>
        <div className="text-sm line-clamp-3" title={stripHtmlTags(log.comments || "No comments")} dangerouslySetInnerHTML={{ __html: log.comments || "No comments" }} />
      </div>
      <div className="text-xs text-muted-foreground mt-2 text-right">
        <div className="flex items-center justify-end gap-1">
          <Avatar className="h-5 w-5">
            <AvatarFallback className="bg-primary/10 text-primary text-xs">
              {getEmployeeNameByUserId(log.createdBy)?.slice(0, 2).toUpperCase() || 'U'}
            </AvatarFallback>
          </Avatar>
          <span>Logged by {getEmployeeNameByUserId(log.createdBy)}</span>
        </div>
      </div>
    </div>
  );

  return (
    <Card className="border shadow-sm">
      <CardHeader className="pb-2 sm:pb-4">
        <CardTitle className="text-lg sm:text-xl flex items-center">
          <Clock className="mr-2 h-4 w-4 sm:h-5 sm:w-5" />
          Time Logs
        </CardTitle>
        <CardDescription>
          Time spent on this {entityType.toLowerCase()}: {totalHoursSpent.toFixed(2)} hours
        </CardDescription>
      </CardHeader>
      <CardContent>
        {isLoading || isLoadingEmployees ? (
          <div className="flex justify-center items-center py-6">
            <Loader2 className="h-6 w-6 animate-spin text-primary" />
            <span className="ml-2">Loading time logs...</span>
          </div>
        ) : error ? (
          <div className="text-center text-red-500 py-4">{error}</div>
        ) : timeLogs.length === 0 ? (
          <div className="text-center text-muted-foreground py-6">
            No time logs recorded for this {entityType.toLowerCase()}.
          </div>
        ) : (
          <>
            {/* Mobile view - Card layout */}
            <div className="sm:hidden">
              {timeLogs.map(renderMobileTimeLog)}
            </div>
            
            {/* Desktop view - Table layout */}
            <div className="hidden sm:block overflow-x-auto">
              <Table>
                <TableHeader>
                  <TableRow>
                    <TableHead>Date</TableHead>
                    <TableHead>Time Range</TableHead>
                    <TableHead>Hours</TableHead>
                    <TableHead>Comments</TableHead>
                    <TableHead>Logged By</TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {timeLogs.map((log) => (
                    <TableRow key={log.id}>
                      <TableCell>
                        {formatDate(log.workDate)}
                      </TableCell>
                      <TableCell>
                        <Badge variant="outline" className="font-mono bg-indigo-50 text-indigo-700 border-indigo-200 px-2 py-0.5">
                          {log.startTime} - {log.endTime}
                        </Badge>
                      </TableCell>
                      <TableCell>
                        <span className="font-medium">{log.hrsSpent.toFixed(2)}</span>
                      </TableCell>
                      <TableCell className="max-w-xs">
                        <div className="truncate" title={stripHtmlTags(log.comments || "No comments")} dangerouslySetInnerHTML={{ __html: log.comments || "No comments" }} />
                      </TableCell>
                      <TableCell>
                        <div className="flex items-center gap-2">
                          <Avatar className="h-7 w-7">
                            <AvatarFallback className="bg-gradient-to-br from-indigo-500 to-purple-500 text-white text-xs">
                              {getEmployeeNameByUserId(log.createdBy)?.slice(0, 2).toUpperCase() || 'U'}
                            </AvatarFallback>
                          </Avatar>
                          <div className="text-sm font-medium text-gray-800">
                            {getEmployeeNameByUserId(log.createdBy)}
                          </div>
                        </div>
                      </TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            </div>
          </>
        )}
      </CardContent>
    </Card>
  );
};

export default TaskTimeLogCard;