'use client'

import { useCallback, useState } from 'react'
import type { AdvisorTurn } from './useAdvisorStream'

function esc(s: string): string {
  return s
    .replace(/&/g, '&')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
}

function sourcesHtml(turn: AdvisorTurn): string {
  if (turn.meta.sources.length === 0) return ''
  const items = turn.meta.sources
    .map((s) => {
      const hier = [s.section, s.subsection, s.paragraph, s.footnoteRef].filter(Boolean).join(' › ')
      return `<li>${esc(s.regulation.short || '')}${hier ? ` — ${esc(hier)}` : ''}</li>`
    })
    .join('')
  return `<p style="color:#64748b;font-size:12px;margin:4px 0 0;">Quellen:</p><ul style="color:#64748b;font-size:12px;margin:2px 0;">${items}</ul>`
}

/** Sends the consultation transcript (question + answer + structured sources) as an email to the DSB. */
export function useAdvisorEmail(turns: AdvisorTurn[], country: string, currentStep: string) {
  const [sending, setSending] = useState(false)
  const [sent, setSent] = useState(false)

  const send = useCallback(async () => {
    if (turns.length === 0 || sending) return
    setSending(true)
    try {
      const qaHtml = turns
        .map(
          (t) =>
            `<div style="margin-bottom:16px;"><p style="font-weight:600;color:#1e293b;">Frage: ${esc(
              t.question,
            )}</p><p style="color:#475569;white-space:pre-wrap;">${esc(t.answer)}</p>${sourcesHtml(t)}</div>`,
        )
        .join('')

      const bodyHtml = `
        <h2 style="color:#1e293b;">Compliance Advisor — Beratungsprotokoll</h2>
        <p style="color:#64748b;font-size:13px;">Datum: ${esc(new Date().toLocaleString('de-DE'))} | Land: ${esc(country)} | Kontext: ${esc(currentStep)}</p>
        <hr style="border-color:#e2e8f0;margin:16px 0;">
        ${qaHtml}
        <hr style="border-color:#e2e8f0;margin:16px 0;">
        <p style="color:#94a3b8;font-size:11px;">Automatisch erstellt vom BreakPilot Compliance Advisor</p>`

      await fetch('/api/sdk/v1/agent/notify', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          recipient: 'dsb@breakpilot.local',
          subject: `Compliance Advisor — ${turns.length} Fragen (${currentStep})`,
          body_html: bodyHtml,
          role: 'Datenschutzbeauftragter',
        }),
      })
      setSent(true)
      setTimeout(() => setSent(false), 3000)
    } catch (e) {
      console.error('Email send failed:', e)
    } finally {
      setSending(false)
    }
  }, [turns, sending, country, currentStep])

  return { send, sending, sent }
}