'use client'

// 2026-04-26 P2.5 by Claude — AIOps Timeline
// ============================================================
// EvidenceViewer — 8D evidence 視覺化
// Tab 切換不同 dimension，每個 dimension 顯示狀態 + 詳情
// ============================================================

import { useState } from 'react'
import { useTranslations } from 'next-intl'
import { CheckCircle2, AlertTriangle, HelpCircle } from 'lucide-react'
import { cn } from '@/lib/utils'
import type { EvidenceDimension } from './types'

interface EvidenceViewerProps {
  dimensions: EvidenceDimension[]
}

const DIMENSION_STATUS_CONFIG = {
  ok:      { icon: CheckCircle2,  color: 'text-status-healthy',  bg: 'bg-status-healthy/10',  label: 'OK' },
  anomaly: { icon: AlertTriangle, color: 'text-status-critical', bg: 'bg-status-critical/10', label: 'ANOMALY' },
  unknown: { icon: HelpCircle,    color: 'text-nothing-gray-400', bg: 'bg-nothing-gray-100',  label: 'UNKNOWN' },
}

export function EvidenceViewer({ dimensions }: EvidenceViewerProps) {
  const t = useTranslations('aiopsTimeline')
  const [activeTab, setActiveTab] = useState(0)
  const active = dimensions[activeTab]

  return (
    <div className="mt-3">
      {/* Tab nav — 8 個 dimension 可滾動 */}
      <div
        className="flex gap-1 overflow-x-auto pb-1 scrollbar-none"
        role="tablist"
        aria-label={t('evidence.dimensions')}
      >
        {dimensions.map((dim, i) => {
          const cfg = DIMENSION_STATUS_CONFIG[dim.status]
          return (
            <button
              key={dim.key}
              role="tab"
              aria-selected={i === activeTab}
              aria-controls={`evidence-panel-${dim.key}`}
              id={`evidence-tab-${dim.key}`}
              onClick={() => setActiveTab(i)}
              className={cn(
                'flex-shrink-0 flex items-center gap-1.5 px-2.5 py-1.5 rounded text-xs font-body transition-all',
                i === activeTab
                  ? cn('border font-medium', cfg.bg,
                      dim.status === 'anomaly' ? 'border-status-critical/30 text-status-critical'
                      : dim.status === 'ok'    ? 'border-status-healthy/30 text-status-healthy'
                      :                          'border-nothing-gray-300 text-nothing-gray-600')
                  : 'text-nothing-gray-500 hover:text-nothing-gray-700 hover:bg-nothing-gray-100'
              )}
            >
              <cfg.icon className={cn('w-3 h-3', i === activeTab ? cfg.color : 'text-nothing-gray-400')} />
              <span className="truncate max-w-[80px]">{dim.name}</span>
            </button>
          )
        })}
      </div>

      {/* Active dimension detail */}
      {active && (
        <div
          id={`evidence-panel-${active.key}`}
          role="tabpanel"
          aria-labelledby={`evidence-tab-${active.key}`}
          className={cn(
            'mt-2 p-3 rounded-lg border',
            active.status === 'anomaly'
              ? 'bg-status-critical/5 border-status-critical/20'
              : active.status === 'ok'
              ? 'bg-status-healthy/5 border-status-healthy/20'
              : 'bg-nothing-gray-50 border-nothing-gray-200'
          )}
        >
          <div className="flex items-start justify-between gap-3">
            <div className="min-w-0">
              <div className="flex items-center gap-2 mb-1">
                {(() => {
                  const cfg = DIMENSION_STATUS_CONFIG[active.status]
                  return (
                    <>
                      <cfg.icon className={cn('w-3.5 h-3.5 flex-shrink-0', cfg.color)} />
                      <span className={cn('text-xs font-body font-bold uppercase tracking-wider', cfg.color)}>
                        {cfg.label}
                      </span>
                    </>
                  )
                })()}
              </div>
              <p className="font-body text-sm font-medium text-nothing-black">
                {active.name}
              </p>
              {active.detail && (
                <p className="font-body text-xs text-nothing-gray-500 mt-0.5">
                  {active.detail}
                </p>
              )}
            </div>
            <div className="flex-shrink-0 text-right">
              <span className="font-body text-sm font-bold text-nothing-black tabular-nums">
                {active.value !== null && active.value !== undefined ? String(active.value) : t('evidence.noData')}
              </span>
            </div>
          </div>
        </div>
      )}

      {/* Summary row: anomaly count */}
      <div className="flex items-center gap-3 mt-2">
        <span className="text-[11px] font-body text-nothing-gray-400">
          {t('evidence.anomalyCount', {
            count: dimensions.filter(d => d.status === 'anomaly').length,
            total: dimensions.length,
          })}
        </span>
        {/* Mini status dots */}
        <div className="flex gap-1 items-center">
          {dimensions.map((d, i) => (
            <div
              key={d.key}
              title={d.name}
              className={cn(
                'w-2 h-2 rounded-full transition-all',
                i === activeTab && 'ring-2 ring-offset-1',
                d.status === 'anomaly' ? 'bg-status-critical'
                : d.status === 'ok'    ? 'bg-status-healthy'
                :                        'bg-nothing-gray-300',
                i === activeTab && d.status === 'anomaly' ? 'ring-status-critical/40'
                : i === activeTab && d.status === 'ok'    ? 'ring-status-healthy/40'
                : i === activeTab                         ? 'ring-nothing-gray-400/40'
                : ''
              )}
            />
          ))}
        </div>
      </div>
    </div>
  )
}