import { NextResponse } from "next/server"
import { and, eq, sql } from "drizzle-orm"
import { db } from "@/lib/db"
import { rent_payments, profiles } from "@/lib/db/schema"
import { getSessionUser } from "@/lib/session"
import { sendEmail, escapeHtml } from "@/lib/email/send"
import { paymentLinkSchema } from "@/lib/validations"

export async function POST(request: Request) {
  const user = await getSessionUser()
  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

  const body = await request.json()
  const parsed = paymentLinkSchema.safeParse(body)
  if (!parsed.success) {
    return NextResponse.json({ error: parsed.error.issues[0]?.message ?? "Invalid payment ID" }, { status: 400 })
  }

  const { payment_id } = parsed.data

  // Fetch payment with tenant details
  const payment = await db.query.rent_payments.findFirst({
    where: and(eq(rent_payments.id, payment_id), eq(rent_payments.user_id, user.id)),
    with: {
      tenant: { columns: { first_name: true, last_name: true, email: true } },
      property: { columns: { name: true } },
      unit: { columns: { unit_number: true } },
    },
  })

  if (!payment) return NextResponse.json({ error: "Payment not found" }, { status: 404 })
  if (!payment.tenant?.email) return NextResponse.json({ error: "Tenant has no email address" }, { status: 400 })

  // Fetch landlord profile for payment instructions
  const profile = await db.query.profiles.findFirst({
    where: eq(profiles.id, user.id),
    columns: { full_name: true },
  })

  const tenantName = `${payment.tenant.first_name} ${payment.tenant.last_name}`
  const amount = Number(payment.amount).toLocaleString("en-US", { style: "currency", currency: "USD" })
  const dueDate = new Date(payment.due_date).toLocaleDateString("en-US", { month: "long", day: "numeric", year: "numeric" })

  const html = `
    <div style="font-family:sans-serif;max-width:560px;margin:0 auto;background:#09090b;color:#fff;border-radius:12px;overflow:hidden;">
      <div style="background:linear-gradient(135deg,#4f46e5,#7c3aed);padding:32px;text-align:center;">
        <h1 style="margin:0;font-size:24px;font-weight:700;">Rent Payment Due</h1>
        <p style="margin:8px 0 0;opacity:.8;font-size:14px;">Property Management Network</p>
      </div>
      <div style="padding:32px;">
        <p style="font-size:16px;margin:0 0 8px;">Hi ${escapeHtml(tenantName)},</p>
        <p style="color:rgba(255,255,255,.6);font-size:14px;margin:0 0 24px;">
          Your rent payment of <strong style="color:#fff;">${amount}</strong> is due on <strong style="color:#fff;">${dueDate}</strong>
          for ${escapeHtml(payment.property?.name)}${payment.unit ? ` Unit ${escapeHtml(payment.unit.unit_number)}` : ""}.
        </p>
        <p style="color:rgba(255,255,255,.6);font-size:14px;margin:0 0 16px;">
          Please arrange payment at your earliest convenience. Contact your landlord if you have any questions.
        </p>
        <p style="color:rgba(255,255,255,.4);font-size:12px;margin:24px 0 0;border-top:1px solid rgba(255,255,255,.08);padding-top:16px;">
          Sent by ${escapeHtml(profile?.full_name ?? "Your Landlord")} via Property Management Network
        </p>
      </div>
    </div>
  `

  try {
    await sendEmail({
      to: payment.tenant.email,
      subject: `Rent Payment Due — ${amount} on ${dueDate}`,
      html,
    })
  } catch {
    return NextResponse.json({ error: "Failed to send email" }, { status: 500 })
  }

  // Update rent_payment to mark reminder sent
  try {
    await db.execute(
      sql`update rent_payments set reminder_sent_at = now() where id = ${payment_id} and user_id = ${user.id}`
    )
  } catch {
    // Email sent successfully, but tracking update failed — still return ok
    return NextResponse.json({ ok: true, message: `Payment reminder sent to ${payment.tenant.email} (tracking update failed)` })
  }

  return NextResponse.json({ ok: true, message: `Payment reminder sent to ${payment.tenant.email}` })
}