import React from "react";
import { 
  AlertCircle, 
  Bug, 
  CheckCircle, 
  Clock, 
  Filter, 
  FlameIcon, 
  PieChart, 
  RefreshCw,
  ShieldAlert,
  ThumbsUp
} from "lucide-react";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { Badge } from "@/components/ui/badge";
import ChartCard from "./chart-card";
import StatsCard from "./stats-card";
import { Task } from "@/services/tasksApi";
import { Employee } from "@/types";
import "@/styles/dashboard.css";

// Helper function to get severity value from a bug
const getBugSeverity = (bug: Task): string => {
  // First check if we have a severity field
  if (bug.severity) {
    return bug.severity;
  }
  // Fall back to type field which may have been used for severity
  return bug.type || '';
};

interface DashboardBugsProps {
  bugs: Task[];
  employees: Employee[];
}

const DashboardBugs: React.FC<DashboardBugsProps> = ({ bugs, employees }) => {
  // Calculate stats for the dashboard
  const totalBugs = bugs.length;
  const openBugs = bugs.filter(bug => 
    ["New", "Open", "In Progress", "Reopened"].includes(bug.status)
  ).length;
  const resolvedBugs = bugs.filter(bug => 
    ["Completed", "Resolved", "Closed"].includes(bug.status)
  ).length;
  const criticalBugs = bugs.filter(bug => 
    ["Blocker", "Critical"].includes(getBugSeverity(bug))
  ).length;

  // Get top assignees by bug count
  const assigneeCounts = bugs.reduce((acc, bug) => {
    if (bug.assignedTo) {
      acc[bug.assignedTo] = (acc[bug.assignedTo] || 0) + 1;
    }
    return acc;
  }, {} as Record<number, number>);

  const topAssignees = Object.entries(assigneeCounts)
    .map(([id, count]) => ({ 
      id: parseInt(id), 
      count 
    }))
    .sort((a, b) => b.count - a.count)
    .slice(0, 5)
    .map(item => {
      const employee = employees.find(emp => emp.id === item.id);
      return {
        id: item.id,
        name: employee ? `${employee.firstName} ${employee.lastName}` : `User ${item.id}`,
        initials: employee ? 
          `${employee.firstName.charAt(0)}${employee.lastName.charAt(0)}`.toUpperCase() : 
          "UN",
        count: item.count
      };
    });

  // Prepare data for charts
  const statusChartData = [{
    name: "Open",
    value: bugs.filter(bug => bug.status === "Open").length,
  }, {
    name: "In Progress",
    value: bugs.filter(bug => bug.status === "In Progress").length,
  }, {
    name: "In Review",
    value: bugs.filter(bug => bug.status === "In Review").length,
  }, {
    name: "Completed",
    value: bugs.filter(bug => bug.status === "Completed").length,
  }, {
    name: "Closed",
    value: bugs.filter(bug => bug.status === "Closed").length,
  }];

  const severityChartData = [{
    name: "Blocker",
    value: bugs.filter(bug => getBugSeverity(bug) === "Blocker").length,
  }, {
    name: "Critical",
    value: bugs.filter(bug => getBugSeverity(bug) === "Critical").length,
  }, {
    name: "Major",
    value: bugs.filter(bug => getBugSeverity(bug) === "Major").length,
  }, {
    name: "Minor",
    value: bugs.filter(bug => getBugSeverity(bug) === "Minor").length,
  }, {
    name: "Trivial",
    value: bugs.filter(bug => getBugSeverity(bug) === "Trivial").length,
  }];

  const trendData = Array(7).fill(0).map((_, i) => {
    const date = new Date();
    date.setDate(date.getDate() - (6 - i));
    
    // Count bugs created on this date
    const count = bugs.filter(bug => {
      if (!bug.createdAt) return false;
      const bugDate = new Date(bug.createdAt);
      return bugDate.toDateString() === date.toDateString();
    }).length;
    
    return {
      name: date.toLocaleDateString('en-US', { weekday: 'short' }),
      value: count
    };
  });

  const getStatusBadge = (status: string) => {
    switch (status) {
      case "Completed":
      case "Closed":
      case "Resolved":
        return (
          <Badge variant="default" className="bg-green-500 hover:bg-green-600 text-white flex items-center gap-1 badge-status-completed badge-glow">
            <CheckCircle className="h-3 w-3" />
            {status}
          </Badge>
        );
      case "In Progress":
        return (
          <Badge variant="default" className="bg-blue-500 hover:bg-blue-600 text-white flex items-center gap-1 badge-status-in-progress badge-glow">
            <RefreshCw className="h-3 w-3" />
            {status}
          </Badge>
        );
      case "Reopened":
      case "Re-Open":
        return (
          <Badge variant="default" className="bg-orange-500 hover:bg-orange-600 text-white flex items-center gap-1 badge-status-open badge-glow">
            <RefreshCw className="h-3 w-3" />
            {status}
          </Badge>
        );
      case "In Review":
      case "Ready for QA":
        return (
          <Badge variant="default" className="bg-purple-500 hover:bg-purple-600 text-white flex items-center gap-1 badge-status-in-review badge-glow">
            <Clock className="h-3 w-3" />
            {status}
          </Badge>
        );
      case "Open":
      case "New":
        return (
          <Badge variant="default" className="bg-gray-500 hover:bg-gray-600 text-white flex items-center gap-1">
            <AlertCircle className="h-3 w-3" />
            {status}
          </Badge>
        );
      default:
        return (
          <Badge variant="default" className="bg-gray-500 hover:bg-gray-600 text-white flex items-center gap-1">
            <AlertCircle className="h-3 w-3" />
            {status || "Unknown"}
          </Badge>
        );
    }
  };

  const getSeverityBadge = (severity: string | Task) => {
    // Use our helper function if we're passed a bug object
    if (typeof severity === 'object') {
      severity = getBugSeverity(severity);
    }
    
    switch (severity) {
      case "Blocker":
        return (
          <Badge variant="outline" className="border-red-700 text-red-700 flex items-center gap-1 badge-severity-high">
            <ShieldAlert className="h-3 w-3" />
            {severity}
          </Badge>
        );
      case "Critical":
        return (
          <Badge variant="outline" className="border-red-500 text-red-500 flex items-center gap-1 badge-severity-high">
            <FlameIcon className="h-3 w-3" />
            {severity}
          </Badge>
        );
      case "Major":
        return (
          <Badge variant="outline" className="border-amber-500 text-amber-500 flex items-center gap-1 badge-severity-medium">
            <AlertCircle className="h-3 w-3" />
            {severity}
          </Badge>
        );
      case "Minor":
        return (
          <Badge variant="outline" className="border-green-500 text-green-500 flex items-center gap-1 badge-severity-low">
            <ThumbsUp className="h-3 w-3" />
            {severity}
          </Badge>
        );
      case "Trivial":
        return (
          <Badge variant="outline" className="border-green-300 text-green-400 flex items-center gap-1 badge-severity-low">
            <ThumbsUp className="h-3 w-3" />
            {severity}
          </Badge>
        );
      default:
        return (
          <Badge variant="outline" className="border-gray-500 text-gray-500 flex items-center gap-1">
            {severity || "Unknown"}
          </Badge>
        );
    }
  };

    return (    <div className="space-y-4 md:space-y-6 card-fade-in">      <h2 className="text-xl md:text-2xl font-bold">Bug Tracking Dashboard</h2>            {/* Stats Overview */}      <div className="grid grid-cols-2 md:grid-cols-2 lg:grid-cols-4 gap-2 md:gap-4">        <StatsCard           title="Total Bugs"           value={totalBugs}           icon={Bug}          iconColor="indigo"          className="bg-gradient-to-br from-indigo-50 to-indigo-100 border-indigo-200 shadow-sm hover-scale text-primary"        />
        
        <StatsCard 
          title="Open Bugs" 
          value={openBugs} 
          icon={AlertCircle}
          iconColor="amber"
          className="bg-gradient-to-br from-amber-50 to-amber-100 border-amber-200 shadow-sm hover-scale text-primary"
          change={{ 
            value: totalBugs ? Math.round((openBugs / totalBugs) * 100) : 0, 
            positive: false 
          }}
        />
        
        <StatsCard 
          title="Resolved Bugs" 
          value={resolvedBugs} 
          icon={CheckCircle}
          iconColor="green"
          className="bg-gradient-to-br from-green-50 to-green-100 border-green-200 shadow-sm hover-scale text-primary"
          change={{ 
            value: totalBugs ? Math.round((resolvedBugs / totalBugs) * 100) : 0, 
            positive: true 
          }}
        />
        
        <StatsCard 
          title="Critical Bugs" 
          value={criticalBugs} 
          icon={ShieldAlert}
          iconColor="red"
          className="bg-gradient-to-br from-red-50 to-red-100 border-red-200 shadow-sm hover-scale text-primary"
          change={{ 
            value: totalBugs ? Math.round((criticalBugs / totalBugs) * 100) : 0, 
            positive: false 
          }}
        />
      </div>
      
            {/* Charts Row */}      <div className="grid grid-cols-1 lg:grid-cols-2 gap-3 md:gap-6">        <div className="chart-container">          <ChartCard            title="Bug Status Distribution"            data={[statusChartData]}            colors={["#6366F1", "#3B82F6", "#8B5CF6", "#22C55E", "#64748B"]}            type="bar"            showGrid={true}            className="shadow-sm hover-scale text-primary"          />        </div>                <div className="chart-container">          <ChartCard            title="Bug Severity Distribution"             data={[severityChartData]}            colors={["#B91C1C", "#EF4444", "#F59E0B", "#22C55E", "#86EFAC"]}            type="bar"            showGrid={true}            className="shadow-sm hover-scale text-primary"          />        </div>      </div>            {/* Additional Charts & Widgets */}      <div className="grid grid-cols-1 lg:grid-cols-3 gap-3 md:gap-6">        <div className="chart-container lg:col-span-2">          <ChartCard            title="Bugs Created (Last 7 days)"            data={[trendData]}            colors={["#6366F1"]}            type="line"            showGrid={true}            className="shadow-sm hover-scale text-primary"          />
        </div>
        
                <Card className="shadow-sm hover-scale">          <CardHeader className="py-3 md:py-4">            <CardTitle className="text-base md:text-lg font-semibold flex items-center gap-2 text-primary">              <PieChart className="h-4 w-4 md:h-5 md:w-5 text-indigo-500" />              Top Bug Handlers            </CardTitle>          </CardHeader>          <CardContent className="py-2 md:py-3">            <div className="space-y-3 md:space-y-4 scrollable-content max-h-[250px] overflow-y-auto">              {topAssignees.length > 0 ? topAssignees.map((assignee, index) => (                <div key={assignee.id} className="flex items-center justify-between stagger-item">                  <div className="flex items-center gap-2 md:gap-3">                    <Avatar className="h-7 w-7 md:h-8 md:w-8 bg-indigo-100">                      <AvatarFallback className="bg-indigo-500 text-white text-xs">                        {assignee.initials}                      </AvatarFallback>                    </Avatar>                    <div>                      <p className="text-xs md:text-sm font-medium truncate max-w-[100px] md:max-w-[140px]">{assignee.name}</p>                      <p className="text-[10px] md:text-xs text-muted-foreground">                        {assignee.count} {assignee.count === 1 ? "bug" : "bugs"}                      </p>                    </div>                  </div>                  <div className="flex items-center gap-2">                    <div className="h-2 md:h-2.5 bg-gray-200 rounded-full w-16 md:w-20">                      <div                         className="h-2 md:h-2.5 bg-indigo-500 rounded-full progress-bar"                         style={{ width: `${Math.min(100, (assignee.count / Math.max(...topAssignees.map(a => a.count))) * 100)}%` }}                      ></div>                    </div>                  </div>                </div>              )) : (                <div className="text-center py-4 text-muted-foreground text-xs md:text-sm">                  <p>No assigned bugs yet</p>                </div>              )}            </div>          </CardContent>        </Card>
      </div>
      
            {/* Recent Issues */}      <Card className="shadow-sm hover-scale">        <CardHeader className="py-3 md:py-4">          <CardTitle className="text-base md:text-lg font-semibold flex items-center gap-2 text-primary">            <Bug className="h-4 w-4 md:h-5 md:w-5 text-indigo-500" />            Recent Issues          </CardTitle>        </CardHeader>        <CardContent className="py-2 md:py-3">          {bugs.length > 0 ? (            <div className="space-y-3 scrollable-content max-h-[350px] overflow-y-auto">              {bugs                .sort((a, b) => {                  const dateA = a.createdAt ? new Date(a.createdAt).getTime() : 0;                  const dateB = b.createdAt ? new Date(b.createdAt).getTime() : 0;                  return dateB - dateA;                })                .slice(0, 5)                .map((bug, index) => (                  <div key={bug.id} className="p-2 md:p-3 rounded-lg border bg-card hover:bg-accent/10 transition-colors stagger-item">                    <div className="flex flex-col md:flex-row md:justify-between md:items-start gap-2 md:gap-0">                      <div className="flex flex-col">                        <div className="flex flex-wrap items-center gap-1 md:gap-2">                          <p className="font-medium text-sm md:text-base">{bug.title}</p>                          <p className="text-[10px] md:text-xs text-muted-foreground bg-muted px-1.5 md:px-2 py-0.5 rounded">                            {bug.taskCode || `BUG-${bug.id}`}                          </p>                        </div>                        <p className="text-[10px] md:text-xs text-muted-foreground mt-1 line-clamp-2">{bug.description}</p>                      </div>                      <div className="flex flex-row md:flex-col items-start md:items-end gap-1 md:gap-2 flex-wrap">                        {getStatusBadge(bug.status)}                        {getSeverityBadge(bug)}                      </div>                    </div>                                        <div className="flex justify-between items-center mt-2 md:mt-3 flex-wrap gap-1">                      <div className="flex items-center gap-1 md:gap-2">                        {bug.assignedTo ? (                          <div className="flex items-center gap-1 md:gap-2">                            <Avatar className="h-5 w-5 md:h-6 md:w-6">                              <AvatarFallback className="text-[10px] md:text-xs">                                {(() => {                                  const employee = employees.find(emp => emp.id === bug.assignedTo);                                  return employee                                     ? `${employee.firstName.charAt(0)}${employee.lastName.charAt(0)}`.toUpperCase()                                    : "UN";                                })()}                              </AvatarFallback>                            </Avatar>                            <span className="text-[10px] md:text-xs text-muted-foreground truncate max-w-[80px] md:max-w-none">                              {(() => {                                const employee = employees.find(emp => emp.id === bug.assignedTo);                                return employee                                   ? `${employee.firstName} ${employee.lastName}`                                  : `User ${bug.assignedTo}`;                              })()}                            </span>                          </div>                        ) : (                          <span className="text-[10px] md:text-xs text-muted-foreground">Unassigned</span>                        )}                      </div>                                            <div className="text-[10px] md:text-xs text-muted-foreground">                        {bug.createdAt ? new Date(bug.createdAt).toLocaleDateString() : "N/A"}                      </div>                    </div>                  </div>                ))}            </div>          ) : (            <div className="text-center py-4 text-muted-foreground text-xs md:text-sm">              <p>No bugs available for your assigned projects</p>            </div>          )}
        </CardContent>
      </Card>
    </div>
  );
};

export default DashboardBugs;