import { useEffect, useState } from 'react'
import { api } from '../api'
import { navigate } from '../App'
import {
  FolderIcon,
  DatabaseIcon,
  RocketIcon,
  TagIcon,
  BarChartIcon,
  SunIcon,
  MoonIcon,
  CpuIcon,
  LayersIcon,
  ZapIcon,
} from './Icons'


export default function Sidebar({ route, currentProject, theme, onToggleTheme }) {
  const [health, setHealth] = useState(null)
  const [notice, setNotice] = useState('')

  useEffect(() => {
    let timer
    const fetchHealth = () => {
      api.health().then(setHealth).catch(() => {})
    }
    fetchHealth()
    timer = setInterval(fetchHealth, 3000)
    return () => clearInterval(timer)
  }, [])

  // REQ-192: free the SAM3 model's VRAM on demand; the 3 s health poll is what
  // confirms it, this only flips the badge straight away when it worked.
  const releaseSam3 = async () => {
    try {
      await api.releaseSam3()
      setHealth((current) => (current ? { ...current, model_loaded: false } : current))
    } catch (exc) {
      setNotice(exc.message)
      setTimeout(() => setNotice(''), 4000)
    }
  }


  const pId = currentProject?.id || route.projectId || 1

  const handleNav = (e, path) => {
    e.preventDefault()
    navigate(path)
  }

  return (
    <header className="roboflow-topbar">
      <div className="topbar-logo" onClick={(e) => handleNav(e, '/projects')} style={{ cursor: 'pointer' }}>
        <span style={{ fontWeight: 700, fontSize: '0.95rem', letterSpacing: '-0.01em', color: '#f4f4f5' }}>
          Dataset Enrichment
        </span>
      </div>

      <nav className="topbar-nav">
        <a
          href="#/projects"
          onClick={(e) => handleNav(e, '/projects')}
          className={`topbar-item ${route.name === 'projects' ? 'active' : ''}`}
        >
          <FolderIcon size={15} />
          <span>Projects</span>
        </a>

        <a
          href={`#/projects/${pId}`}
          onClick={(e) => handleNav(e, `/projects/${pId}`)}
          className={`topbar-item ${route.name === 'library' ? 'active' : ''}`}
        >
          <DatabaseIcon size={15} />
          <span>Video Archive</span>
        </a>

        <a
          href={`#/projects/${pId}/batches`}
          onClick={(e) => handleNav(e, `/projects/${pId}/batches`)}
          className={`topbar-item ${route.name === 'batches' || route.name === 'review' ? 'active' : ''}`}
        >
          <TagIcon size={15} />
          <span>Batches</span>
        </a>

        <a
          href={`#/projects/${pId}/data-prep`}
          onClick={(e) => handleNav(e, `/projects/${pId}/data-prep`)}
          className={`topbar-item ${route.name === 'data-prep' ? 'active' : ''}`}
        >
          <BarChartIcon size={15} />
          <span>Data Preparation</span>
        </a>



        <a
          href={`#/projects/${pId}/datasets`}
          onClick={(e) => handleNav(e, `/projects/${pId}/datasets`)}
          className={`topbar-item ${route.name === 'datasets' ? 'active' : ''}`}
        >
          <LayersIcon size={15} />
          <span>Datasets</span>
        </a>

        <a
          href={`#/projects/${pId}/models`}
          onClick={(e) => handleNav(e, `/projects/${pId}/models`)}
          className={`topbar-item ${route.name === 'models' ? 'active' : ''}`}
        >
          <RocketIcon size={15} />
          <span>Models & Training</span>
        </a>

        <a
          href={`#/projects/${pId}/live-count`}
          onClick={(e) => handleNav(e, `/projects/${pId}/live-count`)}
          className={`topbar-item ${route.name === 'live-count' ? 'active' : ''}`}
        >
          <ZapIcon size={15} />
          <span>Live Counting</span>
        </a>

        <a
          href={`#/projects/${pId}/counting-bench`}
          onClick={(e) => handleNav(e, `/projects/${pId}/counting-bench`)}
          className={`topbar-item ${route.name === 'counting-bench' ? 'active' : ''}`}
        >
          <DatabaseIcon size={15} />
          <span>Counting Accuracy</span>
        </a>

        <a
          href="#/sam3-playground"
          onClick={(e) => handleNav(e, '/sam3-playground')}
          className={`topbar-item ${route.name === 'sam3-playground' ? 'active' : ''}`}
        >
          <CpuIcon size={15} />
          <span>SAM3 Playground</span>
        </a>
      </nav>

      <div className="topbar-right">
        {health && (
          <div className="topbar-health">
            <span className="health-badge" title={health.gpu || ''}>
              GPU: {health.gpu ? health.gpu.replace('NVIDIA GeForce ', '').replace(' Laptop GPU', '') : 'CPU'}
            </span>
            <span className="health-badge">
              VRAM: {health.vram_free_gb ? `${health.vram_free_gb.toFixed(1)}GB` : 'N/A'}
            </span>
            {notice && <span className="health-badge">{notice}</span>}
            {!health.sam3_ready ? (
              <span className="health-badge" title="Not enough free VRAM for SAM3 — free the card first">
                SAM3: Off
              </span>
            ) : health.model_loaded ? (
              <button
                type="button"
                className="health-badge ready"
                title="SAM3 is in VRAM (~3.9 GB) — click to free it now"
                onClick={releaseSam3}
              >
                SAM3: Loaded
              </button>
            ) : (
              <span
                className="health-badge ready"
                title="SAM3 not in VRAM — it loads on the next use (~12 s)"
              >
                SAM3: Idle
              </span>
            )}
          </div>
        )}

        <button
          className="topbar-theme-toggle"
          onClick={onToggleTheme}
          title={theme === 'dark' ? 'Switch to Light Mode' : 'Switch to Dark Mode'}
        >
          {theme === 'dark' ? <SunIcon size={15} /> : <MoonIcon size={15} />}
        </button>
      </div>
    </header>
  )
}