// SendEQSLModal — per-QSO eQSL flow: render the default template with the
// QSO's data, show the exact card, send it as a JPEG e-mail attachment on
// explicit confirmation (never automatic). On success the backend stamps
// eqsl_sent and emits "qsl:sent" so the grid refreshes.

import { useEffect, useRef, useState } from 'react';
import { Loader2, Mail, CheckCircle2 } from 'lucide-react';
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import {
  QSLDefaultTemplateID, RenderEQSL, SendEQSL,
} from '../../../wailsjs/go/main/App';
import type { RenderModel } from './qslTypes';
import { loadCardAssets, type CardAssets } from './qslAssets';
import { CardPreview } from './CardPreview';
import { rasterizeCard } from './rasterize';

interface Props {
  open: boolean;
  qsoId: number | null;
  onClose: () => void;
  onOpenDesigner: () => void;
}

export function SendEQSLModal({ open, qsoId, onClose, onOpenDesigner }: Props) {
  const [model, setModel] = useState<RenderModel | null>(null);
  const [assets, setAssets] = useState<CardAssets | null>(null);
  const [templateId, setTemplateId] = useState(0);
  const [busy, setBusy] = useState(false);
  const [sent, setSent] = useState(false);
  const [error, setError] = useState('');
  const svgEl = useRef<SVGSVGElement | null>(null);

  useEffect(() => {
    if (!open || !qsoId) return;
    setModel(null);
    setAssets(null);
    setSent(false);
    setError('');
    void (async () => {
      try {
        const tid = await QSLDefaultTemplateID();
        setTemplateId(tid);
        if (!tid) return; // no template yet — offer the designer below
        const m = JSON.parse(await RenderEQSL(qsoId, tid)) as RenderModel;
        setModel(m);
        setAssets(await loadCardAssets(m.template, tid));
      } catch (e) {
        setError(String(e));
      }
    })();
  }, [open, qsoId]);

  async function send() {
    if (!qsoId || !model || !svgEl.current) return;
    setBusy(true);
    setError('');
    try {
      const card = model.template.card;
      const jpeg = await rasterizeCard(svgEl.current, card.w, card.h, 'image/jpeg');
      await SendEQSL(qsoId, templateId, jpeg);
      setSent(true);
      // Auto-close shortly after the success tick (the grid refreshes on the
      // qsl:sent event); the user doesn't need to dismiss it manually.
      window.setTimeout(onClose, 1100);
    } catch (e) {
      setError(String(e));
    } finally {
      setBusy(false);
    }
  }

  return (
    <Dialog open={open} onOpenChange={(v) => !v && onClose()}>
      <DialogContent className="max-w-[820px]">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <Mail className="size-5 text-danger" /> Send OpsLog QSL by e-mail
          </DialogTitle>
        </DialogHeader>

        <div className="space-y-3 px-6 py-5">
        {error && (
          <div className="rounded border border-destructive bg-destructive-muted px-3 py-1.5 text-sm text-destructive-muted-foreground">{error}</div>
        )}

        {open && !templateId && !error && (
          <div className="space-y-3 py-2 text-sm">
            <p>No QSL template yet — design one first (drop a few photos, pick a layout).</p>
            <Button size="sm" onClick={() => { onClose(); onOpenDesigner(); }}>Open the designer</Button>
          </div>
        )}

        {templateId > 0 && !model && !error && (
          <div className="flex items-center gap-2 py-6 text-sm text-muted-foreground">
            <Loader2 className="size-4 animate-spin" /> Preparing the card…
          </div>
        )}

        {model && assets && (
          <div className="rounded-md bg-slate-800/60 p-3">
            <CardPreview model={model} assets={assets} width={740}
              svgRef={(el) => { svgEl.current = el; }} />
          </div>
        )}
        </div>

        <DialogFooter>
          {sent ? (
            <div className="flex items-center gap-2 text-sm text-success">
              <CheckCircle2 className="size-4" /> OpsLog QSL sent.
              <Button variant="outline" size="sm" onClick={onClose}>Close</Button>
            </div>
          ) : (
            <>
              <Button variant="outline" size="sm" onClick={onClose}>Cancel</Button>
              <Button size="sm" disabled={!model || busy} onClick={send}>
                {busy && <Loader2 className="mr-1 size-4 animate-spin" />} Send
              </Button>
            </>
          )}
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}