/**
 * DealerProposalSubmissionModal Component
 * Modal for Step 1: Dealer Proposal Submission
 * Allows dealers to upload proposal documents, provide cost breakdown, timeline, and comments
 */

import { useState, useRef, useMemo } from 'react';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Textarea } from '@/components/ui/textarea';
import { Badge } from '@/components/ui/badge';
import { Upload, Plus, X, Calendar, DollarSign, CircleAlert } from 'lucide-react';
import { toast } from 'sonner';

interface CostItem {
  id: string;
  description: string;
  amount: number;
}

interface DealerProposalSubmissionModalProps {
  isOpen: boolean;
  onClose: () => void;
  onSubmit: (data: {
    proposalDocument: File | null;
    costBreakup: CostItem[];
    expectedCompletionDate: string;
    otherDocuments: File[];
    dealerComments: string;
  }) => Promise<void>;
  dealerName?: string;
  activityName?: string;
  requestId?: string;
}

export function DealerProposalSubmissionModal({
  isOpen,
  onClose,
  onSubmit,
  dealerName = 'Jaipur Royal Enfield',
  activityName = 'Activity',
  requestId,
}: DealerProposalSubmissionModalProps) {
  const [proposalDocument, setProposalDocument] = useState<File | null>(null);
  const [costItems, setCostItems] = useState<CostItem[]>([
    { id: '1', description: '', amount: 0 },
  ]);
  const [timelineMode, setTimelineMode] = useState<'date' | 'days'>('date');
  const [expectedCompletionDate, setExpectedCompletionDate] = useState('');
  const [numberOfDays, setNumberOfDays] = useState('');
  const [otherDocuments, setOtherDocuments] = useState<File[]>([]);
  const [dealerComments, setDealerComments] = useState('');
  const [submitting, setSubmitting] = useState(false);

  const proposalDocInputRef = useRef<HTMLInputElement>(null);
  const otherDocsInputRef = useRef<HTMLInputElement>(null);

  // Calculate total estimated budget
  const totalBudget = useMemo(() => {
    return costItems.reduce((sum, item) => sum + (item.amount || 0), 0);
  }, [costItems]);

  // Check if all required fields are filled
  const isFormValid = useMemo(() => {
    const hasProposalDoc = proposalDocument !== null;
    const hasValidCostItems = costItems.length > 0 && 
      costItems.every(item => item.description.trim() !== '' && item.amount > 0);
    const hasTimeline = timelineMode === 'date' 
      ? expectedCompletionDate !== ''
      : numberOfDays !== '' && parseInt(numberOfDays) > 0;
    const hasComments = dealerComments.trim().length > 0;

    return hasProposalDoc && hasValidCostItems && hasTimeline && hasComments;
  }, [proposalDocument, costItems, timelineMode, expectedCompletionDate, numberOfDays, dealerComments]);

  const handleProposalDocChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (file) {
      // Validate file type
      const allowedTypes = ['.pdf', '.doc', '.docx'];
      const fileExtension = '.' + file.name.split('.').pop()?.toLowerCase();
      if (!allowedTypes.includes(fileExtension)) {
        toast.error('Please upload a PDF, DOC, or DOCX file');
        return;
      }
      setProposalDocument(file);
    }
  };

  const handleOtherDocsChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const files = Array.from(e.target.files || []);
    setOtherDocuments(prev => [...prev, ...files]);
  };

  const handleAddCostItem = () => {
    setCostItems(prev => [
      ...prev,
      { id: Date.now().toString(), description: '', amount: 0 },
    ]);
  };

  const handleRemoveCostItem = (id: string) => {
    if (costItems.length > 1) {
      setCostItems(prev => prev.filter(item => item.id !== id));
    }
  };

  const handleCostItemChange = (id: string, field: 'description' | 'amount', value: string | number) => {
    setCostItems(prev =>
      prev.map(item =>
        item.id === id
          ? { ...item, [field]: field === 'amount' ? parseFloat(value.toString()) || 0 : value }
          : item
      )
    );
  };

  const handleRemoveOtherDoc = (index: number) => {
    setOtherDocuments(prev => prev.filter((_, i) => i !== index));
  };

  const handleSubmit = async () => {
    if (!isFormValid) {
      toast.error('Please fill all required fields');
      return;
    }

    // Calculate final completion date if using days mode
    let finalCompletionDate = expectedCompletionDate;
    if (timelineMode === 'days' && numberOfDays) {
      const days = parseInt(numberOfDays);
      const date = new Date();
      date.setDate(date.getDate() + days);
      finalCompletionDate = date.toISOString().split('T')[0];
    }

    try {
      setSubmitting(true);
      await onSubmit({
        proposalDocument,
        costBreakup: costItems.filter(item => item.description.trim() !== '' && item.amount > 0),
        expectedCompletionDate: finalCompletionDate,
        otherDocuments,
        dealerComments,
      });
      handleReset();
      onClose();
    } catch (error) {
      console.error('Failed to submit proposal:', error);
      toast.error('Failed to submit proposal. Please try again.');
    } finally {
      setSubmitting(false);
    }
  };

  const handleReset = () => {
    setProposalDocument(null);
    setCostItems([{ id: '1', description: '', amount: 0 }]);
    setTimelineMode('date');
    setExpectedCompletionDate('');
    setNumberOfDays('');
    setOtherDocuments([]);
    setDealerComments('');
    if (proposalDocInputRef.current) proposalDocInputRef.current.value = '';
    if (otherDocsInputRef.current) otherDocsInputRef.current.value = '';
  };

  const handleClose = () => {
    if (!submitting) {
      handleReset();
      onClose();
    }
  };

  // Get minimum date (today)
  const minDate = new Date().toISOString().split('T')[0];

  return (
    <Dialog open={isOpen} onOpenChange={handleClose}>
      <DialogContent className="max-w-4xl max-h-[90vh] overflow-y-auto">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2 text-2xl">
            <Upload className="w-6 h-6 text-[--re-green]" />
            Dealer Proposal Submission
          </DialogTitle>
          <DialogDescription className="text-base">
            Step 1: Upload proposal and planning details
          </DialogDescription>
          <div className="space-y-1 mt-2 text-sm text-gray-600">
            <div>
              <strong>Dealer:</strong> {dealerName}
            </div>
            <div>
              <strong>Activity:</strong> {activityName}
            </div>
            <div className="mt-2">
              Please upload proposal document, provide cost breakdown, timeline, and detailed comments.
            </div>
          </div>
        </DialogHeader>

        <div className="space-y-6 py-4">
          {/* Proposal Document Section */}
          <div className="space-y-4">
            <div className="flex items-center gap-2">
              <h3 className="font-semibold text-lg">Proposal Document</h3>
              <Badge className="bg-red-500 text-white text-xs">Required</Badge>
            </div>
            <div>
              <Label className="text-base font-semibold flex items-center gap-2">
                Proposal Document *
              </Label>
              <p className="text-sm text-gray-600 mb-2">
                Detailed proposal with activity details and requested information
              </p>
              <div className="border-2 border-dashed border-gray-300 rounded-lg p-4 hover:border-blue-500 transition-colors">
                <input
                  ref={proposalDocInputRef}
                  type="file"
                  accept=".pdf,.doc,.docx"
                  className="hidden"
                  id="proposalDoc"
                  onChange={handleProposalDocChange}
                />
                <label
                  htmlFor="proposalDoc"
                  className="cursor-pointer flex flex-col items-center gap-2"
                >
                  <Upload className="w-8 h-8 text-gray-400" />
                  <span className="text-sm text-gray-600">
                    {proposalDocument
                      ? proposalDocument.name
                      : 'Click to upload proposal (PDF, DOC, DOCX)'}
                  </span>
                </label>
              </div>
            </div>
          </div>

          {/* Cost Breakup Section */}
          <div className="space-y-4">
            <div className="flex items-center justify-between">
              <div className="flex items-center gap-2">
                <h3 className="font-semibold text-lg">Cost Breakup</h3>
                <Badge className="bg-red-500 text-white text-xs">Required</Badge>
              </div>
              <Button
                type="button"
                onClick={handleAddCostItem}
                className="bg-[#2d4a3e] hover:bg-[#1f3329] text-white"
                size="sm"
              >
                <Plus className="w-4 h-4 mr-1" />
                Add Item
              </Button>
            </div>
            <div className="space-y-3">
              {costItems.map((item) => (
                <div key={item.id} className="flex gap-2 items-start">
                  <div className="flex-1">
                    <Input
                      placeholder="Item description (e.g., Banner printing, Event setup)"
                      value={item.description}
                      onChange={(e) =>
                        handleCostItemChange(item.id, 'description', e.target.value)
                      }
                    />
                  </div>
                  <div className="w-40">
                    <Input
                      type="number"
                      placeholder="Amount"
                      min="0"
                      step="0.01"
                      value={item.amount || ''}
                      onChange={(e) =>
                        handleCostItemChange(item.id, 'amount', e.target.value)
                      }
                    />
                  </div>
                  <Button
                    type="button"
                    variant="ghost"
                    size="sm"
                    className="mt-0.5 hover:bg-red-100 hover:text-red-700"
                    onClick={() => handleRemoveCostItem(item.id)}
                    disabled={costItems.length === 1}
                  >
                    <X className="w-4 h-4" />
                  </Button>
                </div>
              ))}
            </div>
            <div className="border-2 border-gray-300 rounded-lg p-4 bg-white">
              <div className="flex items-center justify-between">
                <div className="flex items-center gap-2">
                  <DollarSign className="w-5 h-5 text-gray-700" />
                  <span className="font-semibold text-gray-900">Estimated Budget</span>
                </div>
                <div className="text-2xl font-bold text-gray-900">
                  ₹{totalBudget.toLocaleString('en-IN', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}
                </div>
              </div>
            </div>
          </div>

          {/* Timeline for Closure Section */}
          <div className="space-y-4">
            <div className="flex items-center gap-2">
              <h3 className="font-semibold text-lg">Timeline for Closure</h3>
              <Badge className="bg-red-500 text-white text-xs">Required</Badge>
            </div>
            <div className="space-y-3">
              <div className="flex gap-2">
                <Button
                  type="button"
                  onClick={() => setTimelineMode('date')}
                  className={
                    timelineMode === 'date'
                      ? 'bg-[#2d4a3e] hover:bg-[#1f3329] text-white'
                      : 'border-2 hover:bg-gray-50'
                  }
                  size="sm"
                >
                  <Calendar className="w-4 h-4 mr-1" />
                  Specific Date
                </Button>
                <Button
                  type="button"
                  onClick={() => setTimelineMode('days')}
                  className={
                    timelineMode === 'days'
                      ? 'bg-[#2d4a3e] hover:bg-[#1f3329] text-white'
                      : 'border-2 hover:bg-gray-50'
                  }
                  size="sm"
                >
                  Number of Days
                </Button>
              </div>
              {timelineMode === 'date' ? (
                <div>
                  <Label className="text-sm font-medium mb-2 block">
                    Expected Completion Date
                  </Label>
                  <Input
                    type="date"
                    min={minDate}
                    value={expectedCompletionDate}
                    onChange={(e) => setExpectedCompletionDate(e.target.value)}
                  />
                </div>
              ) : (
                <div>
                  <Label className="text-sm font-medium mb-2 block">
                    Number of Days
                  </Label>
                  <Input
                    type="number"
                    placeholder="Enter number of days"
                    min="1"
                    value={numberOfDays}
                    onChange={(e) => setNumberOfDays(e.target.value)}
                  />
                </div>
              )}
            </div>
          </div>

          {/* Other Supporting Documents Section */}
          <div className="space-y-4">
            <div className="flex items-center gap-2">
              <h3 className="font-semibold text-lg">Other Supporting Documents</h3>
              <Badge variant="secondary" className="text-xs">Optional</Badge>
            </div>
            <div>
              <Label className="flex items-center gap-2 text-base font-semibold">
                Additional Documents
              </Label>
              <p className="text-sm text-gray-600 mb-2">
                Any other supporting documents (invoices, receipts, photos, etc.)
              </p>
              <div className="border-2 border-dashed border-gray-300 rounded-lg p-4 hover:border-blue-500 transition-colors">
                <input
                  ref={otherDocsInputRef}
                  type="file"
                  multiple
                  className="hidden"
                  id="otherDocs"
                  onChange={handleOtherDocsChange}
                />
                <label
                  htmlFor="otherDocs"
                  className="cursor-pointer flex flex-col items-center gap-2"
                >
                  <Upload className="w-8 h-8 text-gray-400" />
                  <span className="text-sm text-gray-600">
                    Click to upload additional documents (multiple files allowed)
                  </span>
                </label>
              </div>
              {otherDocuments.length > 0 && (
                <div className="mt-2 space-y-1">
                  {otherDocuments.map((file, index) => (
                    <div
                      key={index}
                      className="flex items-center justify-between bg-gray-50 p-2 rounded text-sm"
                    >
                      <span className="text-gray-700">{file.name}</span>
                      <Button
                        type="button"
                        variant="ghost"
                        size="sm"
                        className="h-6 w-6 p-0 hover:bg-red-100"
                        onClick={() => handleRemoveOtherDoc(index)}
                      >
                        <X className="w-3 h-3" />
                      </Button>
                    </div>
                  ))}
                </div>
              )}
            </div>
          </div>

          {/* Dealer Comments Section */}
          <div className="space-y-2">
            <Label htmlFor="dealerComments" className="text-base font-semibold flex items-center gap-2">
              Dealer Comments / Details *
            </Label>
            <Textarea
              id="dealerComments"
              placeholder="Provide detailed comments about this claim request, including any special considerations, execution details, or additional information..."
              value={dealerComments}
              onChange={(e) => setDealerComments(e.target.value)}
              className="min-h-[120px]"
            />
            <p className="text-xs text-gray-500">{dealerComments.length} characters</p>
          </div>

          {/* Warning Message */}
          {!isFormValid && (
            <div className="bg-amber-50 border border-amber-200 rounded-lg p-4 flex items-start gap-3">
              <CircleAlert className="w-5 h-5 text-amber-600 flex-shrink-0 mt-0.5" />
              <div className="text-sm text-amber-800">
                <p className="font-semibold mb-1">Missing Required Information</p>
                <p>
                  Please ensure proposal document, cost breakup, timeline, and dealer comments are provided before submitting.
                </p>
              </div>
            </div>
          )}
        </div>

        <DialogFooter className="flex flex-col-reverse gap-2 sm:flex-row sm:justify-end">
          <Button
            variant="outline"
            onClick={handleClose}
            disabled={submitting}
            className="border-2"
          >
            Cancel
          </Button>
          <Button
            onClick={handleSubmit}
            disabled={!isFormValid || submitting}
            className="bg-[#2d4a3e] hover:bg-[#1f3329] text-white disabled:bg-gray-300 disabled:text-gray-500"
          >
            {submitting ? 'Submitting...' : 'Submit Documents'}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}