import { useState, useEffect, useCallback } from 'react'
import { X, ZoomIn, ZoomOut, Maximize2 } from 'lucide-react'
import Tree from 'react-d3-tree'
import axios from 'axios'
import './PedigreeView.css'

function PedigreeView({ dogId, onClose }) {
  const [treeData, setTreeData] = useState(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState('')
  const [translate, setTranslate] = useState({ x: 0, y: 0 })
  const [zoom, setZoom] = useState(0.8)
  const [dimensions, setDimensions] = useState({ width: 0, height: 0 })

  useEffect(() => {
    fetchPedigree()
  }, [dogId])

  useEffect(() => {
    const updateDimensions = () => {
      const container = document.querySelector('.pedigree-container')
      if (container) {
        const width = container.offsetWidth
        const height = container.offsetHeight
        setDimensions({ width, height })
        setTranslate({ x: width / 4, y: height / 2 })
      }
    }
    
    updateDimensions()
    window.addEventListener('resize', updateDimensions)
    return () => window.removeEventListener('resize', updateDimensions)
  }, [])

  const fetchPedigree = async () => {
    try {
      setLoading(true)
      const response = await axios.get(`/api/pedigree/${dogId}?generations=5`)
      const formatted = formatTreeData(response.data)
      setTreeData(formatted)
    } catch (err) {
      setError(err.response?.data?.error || 'Failed to load pedigree')
    } finally {
      setLoading(false)
    }
  }

  const formatTreeData = (dog) => {
    if (!dog) return null

    const children = []
    if (dog.sire) children.push(formatTreeData(dog.sire))
    if (dog.dam) children.push(formatTreeData(dog.dam))

    return {
      name: dog.name,
      attributes: {
        sex: dog.sex,
        birth_date: dog.birth_date,
        registration: dog.registration_number,
        breed: dog.breed,
        color: dog.color,
        generation: dog.generation
      },
      children: children.length > 0 ? children : undefined
    }
  }

  const handleNodeClick = useCallback((nodeData) => {
    console.log('Node clicked:', nodeData)
  }, [])

  const handleZoomIn = () => {
    setZoom(prev => Math.min(prev + 0.2, 2))
  }

  const handleZoomOut = () => {
    setZoom(prev => Math.max(prev - 0.2, 0.4))
  }

  const handleReset = () => {
    setZoom(0.8)
    setTranslate({ x: dimensions.width / 4, y: dimensions.height / 2 })
  }

  const renderCustomNode = ({ nodeDatum, toggleNode }) => (
    <g>
      <circle 
        r="20" 
        fill={nodeDatum.attributes.sex === 'male' ? '#3b82f6' : '#ec4899'}
        stroke="#fff"
        strokeWidth="2"
        onClick={toggleNode}
        style={{ cursor: 'pointer' }}
      />
      <text 
        fill="#fff" 
        strokeWidth="0" 
        x="0" 
        y="5" 
        textAnchor="middle"
        fontSize="12"
        fontWeight="bold"
        style={{ pointerEvents: 'none' }}
      >
        {nodeDatum.attributes.sex === 'male' ? '♂' : '♀'}
      </text>
      <text 
        fill="#1f2937" 
        x="30" 
        y="-10" 
        fontSize="14"
        fontWeight="bold"
        style={{ pointerEvents: 'none' }}
      >
        {nodeDatum.name}
      </text>
      {nodeDatum.attributes.registration && (
        <text 
          fill="#6b7280" 
          x="30" 
          y="8" 
          fontSize="11"
          style={{ pointerEvents: 'none' }}
        >
          {nodeDatum.attributes.registration}
        </text>
      )}
      {nodeDatum.attributes.birth_date && (
        <text 
          fill="#6b7280" 
          x="30" 
          y="22" 
          fontSize="10"
          style={{ pointerEvents: 'none' }}
        >
          Born: {new Date(nodeDatum.attributes.birth_date).getFullYear()}
        </text>
      )}
    </g>
  )

  if (loading) {
    return (
      <div className="modal-overlay">
        <div className="pedigree-modal">
          <div className="loading">Loading pedigree...</div>
        </div>
      </div>
    )
  }

  if (error) {
    return (
      <div className="modal-overlay" onClick={onClose}>
        <div className="pedigree-modal" onClick={(e) => e.stopPropagation()}>
          <div className="modal-header">
            <h2>Pedigree Tree</h2>
            <button className="btn-icon" onClick={onClose}>
              <X size={24} />
            </button>
          </div>
          <div className="error">{error}</div>
        </div>
      </div>
    )
  }

  return (
    <div className="modal-overlay" onClick={onClose}>
      <div className="pedigree-modal" onClick={(e) => e.stopPropagation()}>
        <div className="modal-header">
          <h2>Pedigree Tree - {treeData?.name}</h2>
          <div className="pedigree-controls">
            <button className="btn-icon" onClick={handleZoomOut} title="Zoom Out">
              <ZoomOut size={20} />
            </button>
            <button className="btn-icon" onClick={handleZoomIn} title="Zoom In">
              <ZoomIn size={20} />
            </button>
            <button className="btn-icon" onClick={handleReset} title="Reset View">
              <Maximize2 size={20} />
            </button>
            <button className="btn-icon" onClick={onClose}>
              <X size={24} />
            </button>
          </div>
        </div>

        <div className="pedigree-legend">
          <div className="legend-item">
            <span className="legend-color male"></span>
            <span>Male</span>
          </div>
          <div className="legend-item">
            <span className="legend-color female"></span>
            <span>Female</span>
          </div>
        </div>

        <div className="pedigree-container">
          {treeData && dimensions.width > 0 && (
            <Tree
              data={treeData}
              translate={translate}
              zoom={zoom}
              onNodeClick={handleNodeClick}
              renderCustomNodeElement={renderCustomNode}
              orientation="horizontal"
              pathFunc="step"
              separation={{ siblings: 2, nonSiblings: 2.5 }}
              nodeSize={{ x: 200, y: 100 }}
              enableLegacyTransitions
              transitionDuration={300}
              collapsible={false}
              zoomable={true}
              draggable={true}
              dimensions={dimensions}
            />
          )}
        </div>

        <div className="pedigree-info">
          <p>
            <strong>Tip:</strong> Use mouse wheel to zoom, click and drag to pan. 
            Click on nodes to view details.
          </p>
        </div>
      </div>
    </div>
  )
}

export default PedigreeView