/**
 * JARVIS — Image Panel
 * Drag-and-drop image upload, visual analysis with BLIP + CLIP, then chat.
 */

import React, { useState, useCallback } from 'react'
import { useDropzone } from 'react-dropzone'
import { motion, AnimatePresence } from 'framer-motion'
import {
  Upload, Image, X, Loader2, Eye, Tag,
  ChevronDown, ChevronUp, Sparkles,
} from 'lucide-react'
import clsx from 'clsx'
import toast from 'react-hot-toast'
import useAppStore from '../../stores/appStore'
import { imageAPI } from '../../services/api'

export default function ImagePanel() {
  const { activeSessionId, addImageResult, setPendingImage, setInputMode } = useAppStore()

  const [file,      setFile]      = useState(null)
  const [preview,   setPreview]   = useState(null)
  const [question,  setQuestion]  = useState('')
  const [result,    setResult]    = useState(null)
  const [loading,   setLoading]   = useState(false)
  const [expanded,  setExpanded]  = useState(true)

  // ── Dropzone ───────────────────────────────────
  const onDrop = useCallback((acceptedFiles) => {
    const f = acceptedFiles[0]
    if (!f) return
    setFile(f)
    setResult(null)
    const url = URL.createObjectURL(f)
    setPreview(url)
    // Auto-set pending image for chat context
    setPendingImage({ file: f, preview: url, caption: null })
  }, [setPendingImage])

  const { getRootProps, getInputProps, isDragActive } = useDropzone({
    onDrop,
    accept: { 'image/*': ['.png', '.jpg', '.jpeg', '.gif', '.webp', '.bmp'] },
    maxFiles: 1,
    maxSize: 50 * 1024 * 1024,
  })

  const clearImage = () => {
    setFile(null)
    setPreview(null)
    setResult(null)
    setQuestion('')
    setPendingImage(null)
  }

  // ── Analyze ────────────────────────────────────
  const analyze = async () => {
    if (!file) return
    setLoading(true)
    try {
      const data = await imageAPI.analyzeImage(file, question || null, activeSessionId)
      setResult(data)
      // Update pending image caption for chat context
      setPendingImage({ file, preview, caption: data.caption })
      // Add to message feed
      addImageResult(
        data.session_id,
        question || 'Analyze this image',
        data,
      )
      toast.success('Image analyzed!')
    } catch (err) {
      toast.error(err.message || 'Analysis failed')
    } finally {
      setLoading(false)
    }
  }

  // ── Use in chat ────────────────────────────────
  const useInChat = () => {
    setInputMode('text')
    toast('Image context attached to chat', { icon: '📎' })
  }

  return (
    <div className="bg-jarvis-surface border-t border-jarvis-border">
      {/* Header */}
      <div
        className="flex items-center justify-between px-4 py-2.5 cursor-pointer
                   hover:bg-jarvis-panel/30 transition-colors"
        onClick={() => setExpanded((v) => !v)}
      >
        <div className="flex items-center gap-2">
          <Eye size={13} className="text-jarvis-accent" />
          <span className="text-xs font-medium text-jarvis-text">Vision Analysis</span>
          <span className="text-[10px] font-mono text-jarvis-dim">BLIP + CLIP</span>
        </div>
        {expanded ? <ChevronDown size={13} className="text-jarvis-dim" /> :
                    <ChevronUp   size={13} className="text-jarvis-dim" />}
      </div>

      <AnimatePresence>
        {expanded && (
          <motion.div
            initial={{ height: 0 }}
            animate={{ height: 'auto' }}
            exit={{ height: 0 }}
            className="overflow-hidden"
          >
            <div className="px-4 pb-4 space-y-3">
              {!file ? (
                // ── Drop zone ────────────────────────
                <div
                  {...getRootProps()}
                  className={clsx(
                    'border-2 border-dashed rounded-xl p-6 text-center cursor-pointer',
                    'transition-all duration-200',
                    isDragActive
                      ? 'border-jarvis-accent bg-jarvis-accent/10'
                      : 'border-jarvis-border hover:border-jarvis-accent/50 hover:bg-jarvis-panel/30',
                  )}
                >
                  <input {...getInputProps()} />
                  <Upload size={24} className={clsx('mx-auto mb-2', isDragActive ? 'text-jarvis-accent' : 'text-jarvis-dim')} />
                  <p className="text-xs text-jarvis-muted">
                    {isDragActive ? 'Drop image here…' : 'Drag & drop or click to upload'}
                  </p>
                  <p className="text-[10px] text-jarvis-dim mt-1">PNG, JPG, WEBP · max 50MB</p>
                </div>
              ) : (
                // ── Image preview + controls ─────────
                <div className="flex gap-3">
                  {/* Preview */}
                  <div className="relative flex-shrink-0">
                    <img
                      src={preview}
                      alt="Preview"
                      className="w-28 h-28 object-cover rounded-lg border border-jarvis-border"
                    />
                    <button
                      onClick={clearImage}
                      className="absolute -top-1.5 -right-1.5 w-5 h-5 rounded-full
                                 bg-jarvis-error text-white flex items-center justify-center
                                 hover:brightness-110 transition-all"
                    >
                      <X size={10} />
                    </button>
                  </div>

                  <div className="flex-1 space-y-2">
                    {/* Question input */}
                    <input
                      type="text"
                      value={question}
                      onChange={(e) => setQuestion(e.target.value)}
                      onKeyDown={(e) => e.key === 'Enter' && analyze()}
                      placeholder="Ask about this image… (optional)"
                      className="w-full input-field text-xs py-2"
                    />

                    <div className="flex gap-2">
                      <button
                        onClick={analyze}
                        disabled={loading}
                        className="flex items-center gap-1.5 btn-accent text-xs py-1.5 flex-1"
                      >
                        {loading
                          ? <Loader2 size={12} className="animate-spin" />
                          : <Sparkles size={12} />}
                        {loading ? 'Analyzing…' : 'Analyze'}
                      </button>
                      {result && (
                        <button
                          onClick={useInChat}
                          className="btn-ghost text-xs py-1.5 flex items-center gap-1"
                        >
                          Use in Chat
                        </button>
                      )}
                    </div>
                  </div>
                </div>
              )}

              {/* Results */}
              <AnimatePresence>
                {result && (
                  <motion.div
                    initial={{ opacity: 0, y: 4 }}
                    animate={{ opacity: 1, y: 0 }}
                    className="space-y-2"
                  >
                    {/* Caption */}
                    <div className="panel p-3">
                      <p className="text-[10px] font-mono text-jarvis-dim uppercase tracking-widest mb-1">Caption</p>
                      <p className="text-xs text-jarvis-text">{result.caption}</p>
                    </div>

                    {/* Categories */}
                    {result.top_categories?.length > 0 && (
                      <div className="panel p-3">
                        <p className="text-[10px] font-mono text-jarvis-dim uppercase tracking-widest mb-2">
                          CLIP Categories
                        </p>
                        <div className="space-y-1.5">
                          {result.top_categories.map((cat) => (
                            <div key={cat.label} className="flex items-center gap-2">
                              <div
                                className="h-1 rounded-full bg-jarvis-accent/30"
                                style={{ width: '100%' }}
                              >
                                <div
                                  className="h-1 rounded-full bg-jarvis-accent transition-all"
                                  style={{ width: `${(cat.score * 100).toFixed(0)}%` }}
                                />
                              </div>
                              <span className="text-[10px] text-jarvis-muted whitespace-nowrap font-mono">
                                {(cat.score * 100).toFixed(0)}%
                              </span>
                              <span className="text-[10px] text-jarvis-dim whitespace-nowrap truncate">
                                {cat.label}
                              </span>
                            </div>
                          ))}
                        </div>
                      </div>
                    )}
                  </motion.div>
                )}
              </AnimatePresence>
            </div>
          </motion.div>
        )}
      </AnimatePresence>
    </div>
  )
}