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/**
 * JARVIS β€” Settings Modal
 * Runtime configuration: model status, memory stats, preferences.
 * Opens via keyboard shortcut Ctrl+, or settings button.
 */

import React, { useState, useEffect } from 'react'
import { motion, AnimatePresence } from 'framer-motion'
import {
  X, Brain, Eye, Mic, Database, Zap, Server,
  RefreshCw, Trash2, CheckCircle, XCircle, AlertCircle,
} from 'lucide-react'
import clsx from 'clsx'
import toast from 'react-hot-toast'
import { healthAPI } from '../../services/api'
import useAppStore from '../../stores/appStore'

export default function SettingsModal({ open, onClose }) {
  const [health, setHealth]   = useState(null)
  const [loading, setLoading] = useState(false)
  const { sessions, messages } = useAppStore()

  const fetchHealth = async () => {
    setLoading(true)
    try {
      const data = await healthAPI.check()
      setHealth(data)
    } catch {
      setHealth({ status: 'offline' })
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    if (open) fetchHealth()
  }, [open])

  const totalMessages = Object.values(messages).reduce(
    (sum, msgs) => sum + (msgs?.length || 0), 0
  )

  const models = [
    { key: 'llm',     label: 'Language Model',  icon: Brain,    desc: 'TinyLlama / Mistral' },
    { key: 'blip',    label: 'BLIP Vision',      icon: Eye,      desc: 'Image captioning' },
    { key: 'clip',    label: 'CLIP Vision',      icon: Eye,      desc: 'Image-text similarity' },
    { key: 'whisper', label: 'Whisper STT',      icon: Mic,      desc: 'Speech-to-text' },
  ]

  return (
    <AnimatePresence>
      {open && (
        <>
          {/* Backdrop */}
          <motion.div
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            exit={{ opacity: 0 }}
            className="fixed inset-0 bg-black/60 backdrop-blur-sm z-40"
            onClick={onClose}
          />

          {/* Modal */}
          <motion.div
            initial={{ opacity: 0, scale: 0.95, y: 16 }}
            animate={{ opacity: 1, scale: 1, y: 0 }}
            exit={{ opacity: 0, scale: 0.95, y: 16 }}
            transition={{ type: 'spring', stiffness: 300, damping: 25 }}
            className="fixed inset-0 flex items-center justify-center z-50 p-4"
          >
            <div className="w-full max-w-md bg-jarvis-surface border border-jarvis-border
                            rounded-2xl shadow-2xl overflow-hidden">

              {/* Header */}
              <div className="flex items-center justify-between px-5 py-4
                              border-b border-jarvis-border">
                <div>
                  <h2 className="font-display text-sm font-bold text-jarvis-accent tracking-widest">
                    SYSTEM STATUS
                  </h2>
                  <p className="text-[10px] text-jarvis-dim font-mono mt-0.5">
                    JARVIS Multi-Modal AI Assistant v1.0
                  </p>
                </div>
                <button
                  onClick={onClose}
                  className="p-1.5 rounded-lg text-jarvis-dim hover:text-jarvis-text
                             hover:bg-jarvis-panel transition-colors"
                >
                  <X size={15} />
                </button>
              </div>

              <div className="p-5 space-y-5 max-h-[70vh] overflow-y-auto">

                {/* Backend status */}
                <section>
                  <SectionLabel icon={Server} label="Backend" />
                  <div className="flex items-center gap-2 mt-2">
                    <StatusDot ok={health?.status === 'online'} />
                    <span className="text-sm font-mono text-jarvis-text">
                      {health?.status === 'online' ? 'FastAPI Online' : 'Connecting…'}
                    </span>
                    <button
                      onClick={fetchHealth}
                      disabled={loading}
                      className="ml-auto text-jarvis-dim hover:text-jarvis-accent
                                 transition-colors p-1"
                    >
                      <RefreshCw size={12} className={loading ? 'animate-spin' : ''} />
                    </button>
                  </div>
                </section>

                {/* AI Models */}
                <section>
                  <SectionLabel icon={Brain} label="AI Models" />
                  <div className="mt-2 space-y-2">
                    {models.map(({ key, label, icon: Icon, desc }) => {
                      const status = health?.models?.[key]
                      return (
                        <div key={key}
                          className="flex items-center gap-3 px-3 py-2.5
                                     bg-jarvis-panel rounded-lg border border-jarvis-border">
                          <Icon size={14} className="text-jarvis-dim flex-shrink-0" />
                          <div className="flex-1 min-w-0">
                            <p className="text-xs font-medium text-jarvis-text">{label}</p>
                            <p className="text-[10px] text-jarvis-dim font-mono">{desc}</p>
                          </div>
                          <ModelStatus status={status} />
                        </div>
                      )
                    })}
                  </div>
                </section>

                {/* Memory stats */}
                <section>
                  <SectionLabel icon={Database} label="Memory & Storage" />
                  <div className="mt-2 grid grid-cols-2 gap-2">
                    {[
                      { label: 'Sessions',   value: sessions.length },
                      { label: 'Messages',   value: totalMessages },
                      {
                        label: 'FAISS Vectors',
                        value: health?.memory?.total_vectors ?? 'β€”',
                      },
                      {
                        label: 'Memory Store',
                        value: health?.memory?.initialized ? 'Ready' : 'Not ready',
                      },
                    ].map(({ label, value }) => (
                      <div key={label}
                        className="bg-jarvis-panel rounded-lg border border-jarvis-border
                                   px-3 py-2">
                        <p className="text-[10px] text-jarvis-dim font-mono uppercase tracking-wider">
                          {label}
                        </p>
                        <p className="text-lg font-bold text-jarvis-accent font-mono mt-0.5">
                          {value}
                        </p>
                      </div>
                    ))}
                  </div>
                </section>

                {/* API endpoints */}
                <section>
                  <SectionLabel icon={Zap} label="API Endpoints" />
                  <div className="mt-2 space-y-1 font-mono text-[11px]">
                    {[
                      { method: 'POST', path: '/api/chat/message',   desc: 'Chat' },
                      { method: 'POST', path: '/api/image/analyze',  desc: 'Vision' },
                      { method: 'POST', path: '/api/voice/interact', desc: 'Voice' },
                      { method: 'POST', path: '/api/tools/execute',  desc: 'Tools' },
                      { method: 'WS',   path: '/api/ws/chat/{id}',   desc: 'Streaming' },
                    ].map(({ method, path, desc }) => (
                      <div key={path}
                        className="flex items-center gap-2 px-2 py-1 rounded">
                        <span className={clsx(
                          'text-[9px] font-bold px-1.5 py-0.5 rounded',
                          method === 'POST' ? 'bg-jarvis-accent/20 text-jarvis-accent' :
                          method === 'WS'   ? 'bg-jarvis-success/20 text-jarvis-success' :
                                              'bg-jarvis-muted/20 text-jarvis-muted',
                        )}>
                          {method}
                        </span>
                        <span className="text-jarvis-muted">{path}</span>
                        <span className="ml-auto text-jarvis-dim">{desc}</span>
                      </div>
                    ))}
                  </div>
                </section>

                {/* Docs link */}
                <div className="text-center pt-1">
                  <a
                    href="/api/docs"
                    target="_blank"
                    rel="noopener noreferrer"
                    className="text-xs text-jarvis-accent hover:underline font-mono"
                  >
                    Open Interactive API Docs β†’
                  </a>
                </div>
              </div>
            </div>
          </motion.div>
        </>
      )}
    </AnimatePresence>
  )
}

// ── Helpers ────────────────────────────────────────────────────
function SectionLabel({ icon: Icon, label }) {
  return (
    <div className="flex items-center gap-2">
      <Icon size={11} className="text-jarvis-accent" />
      <span className="text-[10px] font-mono uppercase tracking-widest text-jarvis-dim">
        {label}
      </span>
    </div>
  )
}

function StatusDot({ ok }) {
  return (
    <div className={clsx(
      'w-2 h-2 rounded-full',
      ok ? 'bg-jarvis-success animate-pulse-slow' : 'bg-jarvis-dim',
    )} />
  )
}

function ModelStatus({ status }) {
  if (status === true)  return <CheckCircle size={13} className="text-jarvis-success" />
  if (status === false) return <XCircle     size={13} className="text-jarvis-error" />
  return <AlertCircle size={13} className="text-jarvis-dim" />
}