frontend/src/ui/components/ChatEmptyState.tsx

import React from 'react'

import { AgentIntent, AgentIntentTiles } from './AgentIntentTiles'

type Props = {
  title: string
  description?: string
  isAgent?: boolean
  isPersona?: boolean
  capabilityLabels?: string[]
  onPickPrompt: (text: string) => void
  agentIntent?: AgentIntent | null
  onAgentIntentChange?: (intent: AgentIntent | null) => void
  /** Callback to switch to voice mode — shown for persona projects */
  onResumeVoice?: () => void
}

export function ChatEmptyState({
  title,
  description,
  isAgent,
  isPersona,
  capabilityLabels = [],
  onPickPrompt,
  agentIntent = null,
  onAgentIntentChange,
  onResumeVoice,
}: Props) {
  return (
    <div className="h-full w-full flex items-center justify-center px-6">
      <div className="w-full max-w-2xl">
        <div className="rounded-3xl border border-white/10 bg-white/5 p-8 shadow-[0_20px_80px_rgba(0,0,0,0.35)]">
          <div className="text-2xl font-semibold text-white">{title}</div>

          <div className="mt-2 text-sm text-white/60 leading-relaxed">
            {description?.trim()
              ? description
              : isAgent
              ? 'This project is an advanced assistant. Ask normally — it can use available capabilities when needed.'
              : 'Start a conversation, upload files, or use voice mode.'}
          </div>

          {/* Persona projects: prominent "Continue in Voice" button */}
          {isPersona && onResumeVoice && (
            <div className="mt-5 flex flex-col gap-2">
              <button
                onClick={onResumeVoice}
                className="w-full flex items-center justify-center gap-2 px-5 py-3 rounded-xl bg-gradient-to-r from-purple-600/30 to-blue-600/30 border border-purple-500/40 hover:border-purple-400/60 transition-all text-white font-medium text-sm"
              >
                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M12 2a3 3 0 0 0-3 3v7a3 3 0 0 0 6 0V5a3 3 0 0 0-3-3Z"/><path d="M19 10v2a7 7 0 0 1-14 0v-2"/><line x1="12" x2="12" y1="19" y2="22"/></svg>
                Continue in Voice
              </button>
              <p className="text-center text-[11px] text-white/40">
                Or type below to chat via text
              </p>
            </div>
          )}

          {isAgent && capabilityLabels.length > 0 ? (
            <div className="mt-4">
              <div className="text-xs font-semibold text-white/70">This assistant can:</div>
              <div className="mt-2 flex flex-wrap gap-2">
                {capabilityLabels.map((c) => (
                  <span
                    key={c}
                    className="text-xs px-2 py-1 rounded-full bg-white/10 border border-white/10 text-white/80"
                  >
                    {c}
                  </span>
                ))}
              </div>
            </div>
          ) : null}

          {isAgent ? (
            <>
              <AgentIntentTiles value={agentIntent} onChange={(i) => onAgentIntentChange?.(i)} />

              <div className="mt-4 text-xs text-white/55 leading-relaxed">
                {agentIntent
                  ? "Tip: describe your goal in one sentence — I'll route this to the right tools."
                  : 'Pick an intent to get a focused starting point.'}
              </div>
            </>
          ) : null}
        </div>

        <div className="mt-4 text-center text-[11px] text-white/40">
          HomePilot can make mistakes. Verify important outputs.
        </div>
      </div>
    </div>
  )
}