import React, { useState, useRef } from "react";
import { Card, CardContent, CardHeader, CardTitle, CardDescription } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Avatar, AvatarFallback } from "@/components/ui/avatar";
import { 
  MessageCircle, 
  Calendar, 
  Users, 
  Info, 
  MessageSquare, 
  Video, 
  Phone, 
  Briefcase, 
  Plus, 
  ChevronDown, 
  Loader2,
  ArrowDownUp,
  Printer,
  Building2
} from "lucide-react";
import { format, parseISO } from "date-fns";
import { Badge } from "@/components/ui/badge";
import { Communication, ProjectApi, CommunicationCreateRequest } from "@/types";
import { getCommunicationsByProjectId, createCommunication } from "@/services/communicationApi";
import { useQuery, useQueryClient } from "@tanstack/react-query";
import { cn } from "@/lib/utils";
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter, DialogDescription } from "@/components/ui/dialog";
import { Label } from "@/components/ui/label";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { useNavigate } from "react-router-dom";
import { projectService } from "@/lib/api";
import CustomDialog from "@/components/CustomDialog";
import { toast } from "@/lib/custom-toast";
import SlateRichTextEditor from "@/components/custom/SlateRichTextEditor";

interface ProjectCommunicationTrailSectionProps {
  projectId: number;
}

const ProjectCommunicationTrailSection: React.FC<ProjectCommunicationTrailSectionProps> = ({ 
  projectId
}) => {
  const [sortOrder, setSortOrder] = useState<"desc" | "asc">("desc"); // Newest first by default
  const [printMode, setPrintMode] = useState(false);
  const printRef = useRef<HTMLDivElement>(null);
  const navigate = useNavigate();
  const queryClient = useQueryClient();

  // Add dialog state
  const [isAddDialogOpen, setIsAddDialogOpen] = useState(false);
  const [submitLoading, setSubmitLoading] = useState(false);
  const [formData, setFormData] = useState<Partial<Communication>>({
    topic: '',
    details: '',
    decisionMade: '',
    mode: 'In-person',
    participants: '',
    communicationDate: new Date().toISOString(),
    projectId: projectId,
  });
  
  // Fetch project details to get the project name
  const { data: project } = useQuery({
    queryKey: ['project', projectId],
    queryFn: () => projectService.getById(projectId),
    enabled: !!projectId
  });

  // Get project name
  const projectName = project?.projectName || `Project #${projectId}`;
  
  // Fetch communications
  const {
    data: communicationsResponse = { data: [], success: true },
    isLoading,
    isError,
    refetch
  } = useQuery({
    queryKey: ["communications", projectId],
    queryFn: () => getCommunicationsByProjectId(projectId),
  });

  // Add debug logs
  console.log("Communications response:", communicationsResponse);
  
  // Extract communications array from response with defensive coding
  const communications = 
    // If response has data property and it's an array
    (communicationsResponse && 'data' in communicationsResponse && Array.isArray(communicationsResponse.data))
      ? communicationsResponse.data
      // If response is directly an array (unexpected format but handle it)
      : Array.isArray(communicationsResponse)
        ? communicationsResponse
        // Default to empty array for safety
        : [];
  
  console.log("Extracted communications array:", communications);

  // Get communication icon based on mode
  const getCommunicationIcon = (mode: string) => {
    const m = mode.toLowerCase();
    if (m.includes('virtual') || m.includes('online') || m.includes('video')) {
      return <Video className="h-5 w-5 text-blue-500" />;
    } else if (m.includes('call') || m.includes('phone')) {
      return <Phone className="h-5 w-5 text-green-500" />;
    } else if (m.includes('person') || m.includes('meeting')) {
      return <Users className="h-5 w-5 text-purple-500" />;
    } else {
      return <MessageCircle className="h-5 w-5 text-gray-500" />;
    }
  };

  // Format date
  const formatDate = (dateString: string) => {
    try {
      return format(parseISO(dateString), 'MMM dd, yyyy h:mm a');
    } catch (error) {
      return 'Invalid date';
    }
  };

  // Sort communications by date
  const sortedCommunications = Array.isArray(communications) 
    ? [...communications].sort((a, b) => {
        if (!a || !b) return 0;
        if (!a.communicationDate) return 1; // items without dates go last
        if (!b.communicationDate) return -1;
        
        try {
          const dateA = new Date(a.communicationDate).getTime();
          const dateB = new Date(b.communicationDate).getTime();
          
          if (isNaN(dateA) && isNaN(dateB)) return 0;
          if (isNaN(dateA)) return 1;
          if (isNaN(dateB)) return -1;
          
          return sortOrder === "desc" ? dateB - dateA : dateA - dateB;
        } catch (error) {
          console.error("Error sorting dates:", error);
          return 0;
        }
      })
    : [];

  // Handle form input changes
  const handleInputChange = (e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>) => {
    const { name, value } = e.target;
    setFormData((prev) => ({ ...prev, [name]: value }));
  };

  const handleDateChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    setFormData((prev) => ({ ...prev, communicationDate: new Date(e.target.value).toISOString() }));
  };

  const handleModeChange = (value: string) => {
    setFormData((prev) => ({ 
      ...prev, 
      mode: value 
    }));
  };

  // Handle dialog open/close
  const handleOpenAddDialog = () => {
    setFormData({
      topic: '',
      details: '',
      decisionMade: '',
      mode: 'In-person',
      participants: '',
      communicationDate: new Date().toISOString(),
      projectId: projectId,
    });
    setIsAddDialogOpen(true);
  };

  const handleCloseAddDialog = () => {
    setIsAddDialogOpen(false);
  };

  // Handle form submission
  const handleAddSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    e.stopPropagation();
    
    setSubmitLoading(true);
    try {
      const createData: CommunicationCreateRequest = {
        topic: formData.topic || '',
        details: formData.details || '',
        decisionMade: formData.decisionMade || '',
        mode: formData.mode || 'In-person',
        participants: formData.participants || '',
        communicationDate: formData.communicationDate || new Date().toISOString(),
        projectId: projectId,
      };
      
      console.log('Creating communication with data:', createData);
      
      // Create new communication
      await createCommunication(createData);
      
      toast.success('Communication added successfully');
      handleCloseAddDialog();
      // Refetch communications to update the list
      refetch();
    } catch (err: any) {
      console.error('Error creating communication:', err);
      const errorMessage = err.response?.data?.message || err.message || 'Failed to create communication';
      toast.error(errorMessage);
    } finally {
      setSubmitLoading(false);
    }
  };

  // Handle print button click
  const handlePrint = () => {
    setPrintMode(true);
    
    // Create a new window for printing
    const printWindow = window.open('', '_blank');
    
    if (printWindow && printRef.current) {
      // Get the HTML content directly
      const printContents = printRef.current.innerHTML;
      const totalItems = sortedCommunications.length;
      
      printWindow.document.write(`
        <!DOCTYPE html>
        <html>
          <head>
            <title>${projectName} - Communication Trail</title>
            <style>
              @page { margin: 1cm; }
              body { 
                font-family: Arial, sans-serif; 
                margin: 0; 
                padding: 0;
              }
              .print-container {
                width: 100%;
                padding: 20px;
              }
              .header { 
                display: flex; 
                flex-direction: column;
                margin-bottom: 20px;
                border-bottom: 1px solid #ccc;
                padding-bottom: 10px;
              }
              .header h1 { 
                margin: 0 0 10px 0; 
              }
              .header .project-name {
                font-size: 16px;
                font-weight: 500;
                color: #555;
                margin-bottom: 5px;
                word-break: break-word;
              }
              .content-info {
                margin-bottom: 20px;
                font-style: italic;
                color: #666;
              }
              .communication-item { 
                margin-bottom: 25px; 
                page-break-inside: avoid; 
                border-bottom: 1px solid #eee;
                padding-bottom: 20px;
              }
              .communication-item h3 { 
                margin-bottom: 10px; 
                color: #333;
              }
              .mode-badge {
                display: inline-block;
                padding: 3px 8px;
                background-color: #f3f4f6;
                border: 1px solid #e5e7eb;
                border-radius: 4px;
                font-size: 12px;
                margin-bottom: 10px;
              }
              .details { 
                margin-bottom: 15px; 
                white-space: pre-wrap; 
              }
              .decision {
                background-color: #f9fafb;
                padding: 10px;
                border-radius: 4px;
                margin-bottom: 15px;
              }
              .decision-label {
                font-weight: bold;
                margin-bottom: 5px;
              }
              .meta-info {
                color: #666;
                font-size: 12px;
                margin-bottom: 5px;
              }
              .meta-info-label {
                font-weight: bold;
                display: inline-block;
                width: 100px;
              }
              @media print { 
                .no-print { display: none; }
              }
            </style>
          </head>
          <body>
            <div class="print-container">
              <div class="header">
                <h1>Project Communication Trail</h1>
                <div class="project-name">${projectName}</div>
              </div>
              
              <div class="content-info">
                Total communications: ${totalItems}
              </div>
              
              <div class="print-content">
                ${printContents}
              </div>
              
              <div class="no-print" style="margin-top: 30px; text-align: center;">
                <button onclick="window.print()" style="padding: 8px 16px; margin-right: 10px;">Print</button>
                <button onclick="window.close()" style="padding: 8px 16px;">Close</button>
              </div>
            </div>
          </body>
        </html>
      `);
      
      printWindow.document.close();
      
      // Add event listeners
      printWindow.onafterprint = () => {
        setPrintMode(false);
      };
      
      printWindow.onunload = () => {
        setPrintMode(false);
      };
      
      // Use a longer delay to ensure content is properly rendered
      setTimeout(() => {
        // Log to debug
        console.log(`Preparing to print ${totalItems} communications`);
        try {
          printWindow.focus();
          printWindow.print();
        } catch (error) {
          console.error("Print error:", error);
          setPrintMode(false);
        }
      }, 1200);
    } else {
      // If window couldn't be opened, reset the state
      setPrintMode(false);
      alert("Could not open print window. Please check your popup blocker settings.");
    }
  };

  // Add a utility function to safely render HTML
  const HtmlContent: React.FC<{ html: string }> = ({ html }) => {
    return (
      <div dangerouslySetInnerHTML={{ __html: html }} />
    );
  };

  return (
    <Card className="shadow-sm">
      <CardHeader className="flex flex-row items-center justify-between pb-2 space-y-0">
        <div>
          <CardTitle className="text-xl flex items-center gap-2">
            <MessageCircle className="h-5 w-5" />
            Communication Trail
          </CardTitle>
          <CardDescription>
            Project communications and meeting notes
          </CardDescription>
        </div>
        <div className="flex items-center gap-2">
          <Button 
            variant="outline" 
            size="sm" 
            className={cn(
              "flex items-center gap-1 text-xs sm:text-sm h-8",
              sortOrder === "desc" ? "bg-slate-50" : ""
            )}
            onClick={() => setSortOrder(sortOrder === "desc" ? "asc" : "desc")}
          >
            <ArrowDownUp className="h-3 w-3 sm:h-3.5 sm:w-3.5 mr-1" />
            {sortOrder === "desc" ? "Newest first" : "Oldest first"}
          </Button>
          <Button
            variant="outline"
            size="sm"
            className="flex items-center gap-1 h-8"
            onClick={handlePrint}
            disabled={!Array.isArray(sortedCommunications) || sortedCommunications.length === 0}
          >
            <Printer className="h-3.5 w-3.5 mr-1" />
            Print
          </Button>
          <Button 
            size="sm" 
            className="flex items-center gap-1"
            onClick={handleOpenAddDialog}
          >
            <Plus className="h-3.5 w-3.5" />
            <span>Add</span>
          </Button>
        </div>
      </CardHeader>
      
      <CardContent>
        {isLoading ? (
          <div className="flex justify-center items-center py-12">
            <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />
          </div>
        ) : isError ? (
          <div className="text-center bg-red-50 text-red-700 py-6 px-4 rounded-md border border-red-100">
            <p className="text-sm font-medium">Unable to load communication trail</p>
          </div>
        ) : !Array.isArray(sortedCommunications) || sortedCommunications.length === 0 ? (
          <div className="text-center py-12 border border-dashed rounded-lg flex flex-col items-center">
            <MessageCircle className="h-12 w-12 text-muted-foreground mb-2" />
            <p className="text-base font-medium text-muted-foreground mb-2">No communications yet</p>
            <p className="text-sm text-muted-foreground mb-4">
              Record important communications and meeting decisions for this project
            </p>
            <Button onClick={handleOpenAddDialog}>
              Add Communication
            </Button>
          </div>
        ) : (
          <>
            <div className="space-y-4">
              {sortedCommunications.map((communication) => (
                <div 
                  key={communication.communicationId} 
                  className="border rounded-lg p-4 hover:bg-accent/20 transition-colors"
                >
                  <div className="flex items-start gap-3">
                    <div className="p-2 bg-slate-100 rounded-full flex-shrink-0">
                      {getCommunicationIcon(communication.mode)}
                    </div>
                    
                    <div className="flex-1 min-w-0">
                      <div className="flex items-center justify-between mb-2 flex-wrap gap-2">
                        <h3 className="font-medium">{communication.topic}</h3>
                        <Badge variant="outline" className="text-xs font-normal">
                          {communication.mode}
                        </Badge>
                      </div>
                      
                      <p className="text-sm text-muted-foreground mb-3 whitespace-pre-wrap">
                        {communication.details}
                      </p>
                      
                      {communication.decisionMade && (
                        <div className="mb-3 bg-slate-50 p-2 rounded-md">
                          <p className="text-xs font-medium text-slate-500 mb-1">Decision:</p>
                          <p className="text-sm">{communication.decisionMade}</p>
                        </div>
                      )}
                      
                      <div className="flex flex-wrap gap-x-4 gap-y-1 text-xs text-slate-500">
                        <div className="flex items-center gap-1">
                          <Calendar className="h-3.5 w-3.5" />
                          <span>{formatDate(communication.communicationDate)}</span>
                        </div>
                        
                        <div className="flex items-center gap-1">
                          <Users className="h-3.5 w-3.5" />
                          <span>
                            {communication.participants}
                          </span>
                        </div>
                        
                        {communication.createdByName && (
                          <div className="flex items-center gap-1">
                            <Info className="h-3.5 w-3.5" />
                            <span>Added by {communication.createdByName}</span>
                          </div>
                        )}
                      </div>
                    </div>
                  </div>
                </div>
              ))}
            </div>
            
            {/* Printable version - hidden from normal view */}
            <div className="hidden">
              <div ref={printRef} className="print-content">
                {sortedCommunications.map((communication, index) => (
                  <div key={communication.communicationId} className="communication-item" data-index={index}>
                    <h3>{communication.topic}</h3>
                    <div className="mode-badge">{communication.mode}</div>
                    
                    <div className="details">
                      <strong>Details:</strong><br />
                      <HtmlContent html={communication.details || "No details provided."} />
                    </div>
                    
                    {communication.decisionMade && (
                      <div className="decision">
                        <div className="decision-label">Decision:</div>
                        <HtmlContent html={communication.decisionMade} />
                      </div>
                    )}
                    
                    <div className="meta-info">
                      <span className="meta-info-label">Date/Time:</span>
                      {formatDate(communication.communicationDate)}
                    </div>
                    
                    <div className="meta-info">
                      <span className="meta-info-label">Participants:</span>
                      {communication.participants}
                    </div>
                    
                    {communication.createdByName && (
                      <div className="meta-info">
                        <span className="meta-info-label">Added by:</span>
                        {communication.createdByName}
                      </div>
                    )}
                  </div>
                ))}
              </div>
            </div>
          </>
        )}
      </CardContent>

      {/* Add Communication Dialog */}
      <CustomDialog 
        isOpen={isAddDialogOpen}
        onClose={handleCloseAddDialog}
        title="Add Communication"
        description={`Add a new communication record for ${projectName}`}
        isPending={submitLoading}
      >
        <form onSubmit={handleAddSubmit}>
          <div className="grid gap-4 py-4">
            <div className="grid grid-cols-1 gap-2">
              <Label htmlFor="topic">Topic</Label>
              <Input
                id="topic"
                name="topic"
                placeholder="Enter communication topic"
                value={formData.topic || ''}
                onChange={handleInputChange}
                required
              />
            </div>
            
            <div className="grid grid-cols-1 gap-2">
              <Label htmlFor="details">Details</Label>
              <SlateRichTextEditor
                initialValue={formData.details || ''}
                onChange={(value) => {
                  setFormData(prev => ({
                    ...prev,
                    details: value
                  }));
                }}
                placeholder="Enter communication details"
                minHeight="150px"
              />
            </div>
            
            <div className="grid grid-cols-1 gap-2">
              <Label htmlFor="decisionMade">Decision Made</Label>
              <SlateRichTextEditor
                initialValue={formData.decisionMade || ''}
                onChange={(value) => {
                  setFormData(prev => ({
                    ...prev,
                    decisionMade: value
                  }));
                }}
                placeholder="Enter decisions made during this communication"
                minHeight="150px"
              />
            </div>
            
            <div className="grid grid-cols-2 gap-4">
              <div className="grid grid-cols-1 gap-2">
                <Label htmlFor="mode">Mode</Label>
                <div className="relative">
                  <Button 
                    type="button"
                    variant="outline" 
                    className="w-full justify-between"
                    onClick={(e) => {
                      e.preventDefault();
                      const dropdown = document.getElementById('add-mode-dropdown');
                      if (dropdown) {
                        dropdown.classList.toggle('hidden');
                        
                        // Add click outside handler
                        const clickHandler = (evt: any) => {
                          if (!dropdown.contains(evt.target) && 
                              !(e.target as HTMLElement).contains(evt.target)) {
                            dropdown.classList.add('hidden');
                            document.removeEventListener('click', clickHandler);
                          }
                        };
                        
                        // Delay to avoid immediate triggering
                        setTimeout(() => {
                          document.addEventListener('click', clickHandler);
                        }, 0);
                      }
                    }}
                  >
                    <span className="flex items-center gap-2">
                      {getCommunicationIcon(formData.mode || 'In-person')}
                      {formData.mode || 'Select Mode'}
                    </span>
                    <ChevronDown className="h-4 w-4 opacity-50" />
                  </Button>
                  <div 
                    id="add-mode-dropdown"
                    className="absolute left-0 right-0 top-full mt-1 z-50 bg-white shadow-lg border rounded-md p-1 hidden"
                  >
                    <button 
                      type="button"
                      className="relative flex w-full cursor-default select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none hover:bg-slate-100 text-slate-700"
                      onClick={(e) => {
                        e.preventDefault();
                        handleModeChange('In-person');
                        document.getElementById('add-mode-dropdown')?.classList.add('hidden');
                      }}
                    >
                      <Building2 className="h-4 w-4 mr-2 text-primary" />
                      <span>In-person</span>
                    </button>
                    <button 
                      type="button"
                      className="relative flex w-full cursor-default select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none hover:bg-slate-100 text-slate-700"
                      onClick={(e) => {
                        e.preventDefault();
                        handleModeChange('Virtual');
                        document.getElementById('add-mode-dropdown')?.classList.add('hidden');
                      }}
                    >
                      <Video className="h-4 w-4 mr-2 text-purple-500" />
                      <span>Virtual</span>
                    </button>
                    <button 
                      type="button"
                      className="relative flex w-full cursor-default select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none hover:bg-slate-100 text-slate-700"
                      onClick={(e) => {
                        e.preventDefault();
                        handleModeChange('Phone');
                        document.getElementById('add-mode-dropdown')?.classList.add('hidden');
                      }}
                    >
                      <Phone className="h-4 w-4 mr-2 text-orange-500" />
                      <span>Phone</span>
                    </button>
                    <button 
                      type="button"
                      className="relative flex w-full cursor-default select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none hover:bg-slate-100 text-slate-700"
                      onClick={(e) => {
                        e.preventDefault();
                        handleModeChange('Email');
                        document.getElementById('add-mode-dropdown')?.classList.add('hidden');
                      }}
                    >
                      <MessageSquare className="h-4 w-4 mr-2 text-blue-500" />
                      <span>Email</span>
                    </button>
                  </div>
                </div>
              </div>
              
              <div className="grid grid-cols-1 gap-2">
                <Label htmlFor="communicationDate">Date</Label>
                <Input
                  id="communicationDate"
                  name="communicationDate"
                  type="datetime-local"
                  value={formData.communicationDate ? new Date(formData.communicationDate).toISOString().slice(0, 16) : ''}
                  onChange={handleDateChange}
                  required
                />
              </div>
            </div>
            
            <div className="grid grid-cols-1 gap-2">
              <Label htmlFor="participants">Participants</Label>
              <Input
                id="participants"
                name="participants"
                placeholder="Enter participant names (comma separated)"
                value={formData.participants || ''}
                onChange={handleInputChange}
                required
              />
            </div>
          </div>
          <div className="flex justify-end gap-2 mt-4">
            <Button type="button" variant="outline" onClick={handleCloseAddDialog} disabled={submitLoading}>
              Cancel
            </Button>
            <Button type="submit" disabled={submitLoading}>
              {submitLoading ? (
                <>
                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                  Adding...
                </>
              ) : (
                'Add Communication'
              )}
            </Button>
          </div>
        </form>
      </CustomDialog>
    </Card>
  );
};

export default ProjectCommunicationTrailSection;