import { NextRequest, NextResponse } from 'next/server'
import { prisma } from '@/lib/db'
import { getSession } from '@/lib/auth'
import { getProjectWithTenantCheck } from '@/lib/tenant'
import { sendEmail } from '@/lib/email'

export async function POST(req: NextRequest, { params }: { params: { id: string } }) {
  try {
    const user = await getSession()
    if (!user) return NextResponse.json({ error: 'Nicht autorisiert' }, { status: 401 })

    const project = await getProjectWithTenantCheck(params.id, user)
    if (!project) return NextResponse.json({ error: 'Projekt nicht gefunden' }, { status: 404 })

    // Load tenant logo
    let tenantLogoUrl = ''
    let tenantName = ''
    if ((project as any).tenantId) {
      const tenant = await (prisma as any).tenant.findUnique({
        where: { id: (project as any).tenantId },
        select: { logoUrl: true, name: true },
      })
      if (tenant?.logoUrl) tenantLogoUrl = tenant.logoUrl
      if (tenant?.name) tenantName = tenant.name
    }

    const body = await req.json()
    const { recipientEmail } = body
    if (!recipientEmail) {
      return NextResponse.json({ error: 'Empfänger-E-Mail erforderlich' }, { status: 400 })
    }

    // Load journal data
    const entries = await (prisma as any).journalEntry.findMany({
      where: { projectId: params.id },
      orderBy: [{ time: 'asc' }, { sortOrder: 'asc' }],
    })

    const checkItems = await (prisma as any).journalCheckItem.findMany({
      where: { projectId: params.id },
      orderBy: { sortOrder: 'asc' },
    })

    const pendenzen = await (prisma as any).journalPendenz.findMany({
      where: { projectId: params.id },
      orderBy: { sortOrder: 'asc' },
    })

    // Build HTML report
    const formatTime = (d: Date) => new Date(d).toLocaleTimeString('de-CH', { hour: '2-digit', minute: '2-digit' })
    const formatDate = (d: Date) => new Date(d).toLocaleDateString('de-CH', { day: '2-digit', month: '2-digit', year: 'numeric' })

    const p = project as any

    let entriesHtml = ''
    for (const e of entries) {
      const correctedStyle = e.isCorrected ? 'text-decoration:line-through;opacity:0.5;' : ''
      const correctionStyle = e.correctionOfId ? 'color:#b45309;font-style:italic;' : ''
      const doneIcon = e.done ? '✅' : ''
      const doneAtStr = e.done && e.doneAt ? ` <span style="color:#16a34a;font-size:10px;">(erledigt ${formatTime(e.doneAt)})</span>` : ''
      entriesHtml += `
        <tr style="${correctedStyle}${correctionStyle}">
          <td style="padding:4px 8px;border-bottom:1px solid #e5e7eb;font-family:monospace;font-size:12px;white-space:nowrap;">${formatTime(e.time)}</td>
          <td style="padding:4px 8px;border-bottom:1px solid #e5e7eb;font-size:13px;">${e.what}${e.isCorrected ? ' <span style="color:#ef4444;font-size:11px;">(korrigiert)</span>' : ''}${doneAtStr}</td>
          <td style="padding:4px 8px;border-bottom:1px solid #e5e7eb;font-size:12px;color:#666;">${e.who || '–'}</td>
          <td style="padding:4px 8px;border-bottom:1px solid #e5e7eb;text-align:center;">${doneIcon}</td>
        </tr>`
    }

    let checkHtml = ''
    for (const c of checkItems) {
      const confirmedTime = c.confirmed && c.confirmedAt ? ` <span style="font-size:10px;color:#666;">${formatTime(c.confirmedAt)}</span>` : ''
      checkHtml += `
        <tr>
          <td style="padding:3px 8px;border-bottom:1px solid #e5e7eb;font-size:13px;">${c.label}${confirmedTime}</td>
          <td style="padding:3px 8px;border-bottom:1px solid #e5e7eb;text-align:center;">${c.confirmed ? '✅' : '–'}</td>
          <td style="padding:3px 8px;border-bottom:1px solid #e5e7eb;text-align:center;">${c.ok ? '✅' : '–'}</td>
        </tr>`
    }

    let pendHtml = ''
    for (const p of pendenzen) {
      const pendDoneAt = p.done && p.doneAt ? ` <span style="color:#16a34a;font-size:10px;">(${formatTime(p.doneAt)})</span>` : ''
      pendHtml += `
        <tr>
          <td style="padding:3px 8px;border-bottom:1px solid #e5e7eb;font-size:13px;">${p.what}${pendDoneAt}</td>
          <td style="padding:3px 8px;border-bottom:1px solid #e5e7eb;font-size:12px;color:#666;">${p.who || '–'}</td>
          <td style="padding:3px 8px;border-bottom:1px solid #e5e7eb;font-size:12px;color:#666;">${p.whenHow || '–'}</td>
          <td style="padding:3px 8px;border-bottom:1px solid #e5e7eb;text-align:center;">${p.done ? '✅' : '–'}</td>
        </tr>`
    }

    const logoHtml = tenantLogoUrl
      ? `<img src="${tenantLogoUrl}" alt="${tenantName}" style="height:40px;max-width:120px;object-fit:contain;margin-right:16px;border-radius:4px;" />`
      : ''

    const html = `
      <div style="font-family:sans-serif;max-width:800px;margin:0 auto;">
        <div style="background:#dc2626;color:white;padding:20px 24px;border-radius:12px 12px 0 0;display:flex;align-items:center;">
          ${logoHtml}
          <div>
            <h1 style="margin:0;font-size:22px;">Einsatzrapport</h1>
            <p style="margin:4px 0 0;opacity:0.9;">${p.title || 'Ohne Titel'}${tenantName ? ` — ${tenantName}` : ''}</p>
          </div>
        </div>
        <div style="border:1px solid #e5e7eb;border-top:none;padding:24px;border-radius:0 0 12px 12px;">
          <div style="display:flex;gap:24px;margin-bottom:20px;flex-wrap:wrap;">
            <div><strong>Standort:</strong> ${p.location || '–'}</div>
            <div><strong>Datum:</strong> ${p.createdAt ? formatDate(p.createdAt) : '–'}</div>
          </div>

          <h2 style="font-size:16px;border-bottom:2px solid #dc2626;padding-bottom:4px;margin:20px 0 8px;">Journal-Einträge</h2>
          <table style="width:100%;border-collapse:collapse;">
            <thead>
              <tr style="background:#f5f5f4;">
                <th style="padding:6px 8px;text-align:left;font-size:11px;color:#666;border-bottom:2px solid #dc2626;">Zeit</th>
                <th style="padding:6px 8px;text-align:left;font-size:11px;color:#666;border-bottom:2px solid #dc2626;">Was</th>
                <th style="padding:6px 8px;text-align:left;font-size:11px;color:#666;border-bottom:2px solid #dc2626;">Wer</th>
                <th style="padding:6px 8px;text-align:center;font-size:11px;color:#666;border-bottom:2px solid #dc2626;">Ok</th>
              </tr>
            </thead>
            <tbody>${entriesHtml || '<tr><td colspan="4" style="padding:12px;text-align:center;color:#999;">Keine Einträge</td></tr>'}</tbody>
          </table>

          ${checkItems.length > 0 ? `
          <h2 style="font-size:16px;border-bottom:2px solid #dc2626;padding-bottom:4px;margin:20px 0 8px;">SOMA Checkliste</h2>
          <table style="width:100%;border-collapse:collapse;">
            <thead>
              <tr style="background:#f5f5f4;">
                <th style="padding:6px 8px;text-align:left;font-size:11px;color:#666;">Punkt</th>
                <th style="padding:6px 8px;text-align:center;font-size:11px;color:#666;">Bestätigt</th>
                <th style="padding:6px 8px;text-align:center;font-size:11px;color:#666;">Ok</th>
              </tr>
            </thead>
            <tbody>${checkHtml}</tbody>
          </table>` : ''}

          ${pendenzen.length > 0 ? `
          <h2 style="font-size:16px;border-bottom:2px solid #dc2626;padding-bottom:4px;margin:20px 0 8px;">Pendenzen</h2>
          <table style="width:100%;border-collapse:collapse;">
            <thead>
              <tr style="background:#f5f5f4;">
                <th style="padding:6px 8px;text-align:left;font-size:11px;color:#666;">Was</th>
                <th style="padding:6px 8px;text-align:left;font-size:11px;color:#666;">Wer</th>
                <th style="padding:6px 8px;text-align:left;font-size:11px;color:#666;">Wann/Wie</th>
                <th style="padding:6px 8px;text-align:center;font-size:11px;color:#666;">Erledigt</th>
              </tr>
            </thead>
            <tbody>${pendHtml}</tbody>
          </table>` : ''}

          <hr style="margin:20px 0;border:none;border-top:1px solid #e5e7eb;" />
          <p style="color:#999;font-size:11px;">Gesendet von Lageplan am ${new Date().toLocaleString('de-CH')} durch ${user.name || user.email}</p>
        </div>
      </div>`

    await sendEmail(
      recipientEmail,
      `Einsatzrapport — ${p.title || 'Ohne Titel'}`,
      html
    )

    return NextResponse.json({ success: true, message: `Rapport an ${recipientEmail} gesendet` })
  } catch (error) {
    console.error('Error sending report:', error)
    return NextResponse.json({ error: 'Fehler beim Senden des Rapports' }, { status: 500 })
  }
}