import { useState, useMemo } from 'react';
import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle, DialogTrigger } from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { Label } from '@/components/ui/label';
import { ToggleGroup, ToggleGroupItem } from '@/components/ui/toggle-group';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useAuthor } from '@/hooks/useAuthor';
import { useWallet } from '@/hooks/useWallet';
import { useCrewZap, splitAmount, type CrewZapResult } from '@/hooks/useCrewZap';
import { useToast } from '@/hooks/useToast';
import { genUserName } from '@/lib/genUserName';
import { Zap, Check, Copy, Loader2, X, Users, AlertCircle } from 'lucide-react';
import { cn } from '@/lib/utils';

const PRESETS = [210, 500, 1000, 2100, 5000];

interface ZapCrewDialogProps {
  crewName: string;
  /** Recipient pubkeys — typically founder + confirmed members. */
  recipients: string[];
  children: React.ReactNode;
}

function RecipientRow({ result }: { result: CrewZapResult }) {
  const author = useAuthor(result.pubkey);
  const meta = author.data?.metadata;
  const name = meta?.name ?? genUserName(result.pubkey);
  const { toast } = useToast();

  const copyInvoice = async () => {
    if (!result.invoice) return;
    await navigator.clipboard.writeText(result.invoice);
    toast({ title: 'Invoice copied', description: 'Paste it into any Lightning wallet' });
  };

  return (
    <div className="flex items-center gap-2 rounded-lg border border-gray-700 bg-black/40 p-2">
      <Avatar className="h-7 w-7">
        <AvatarImage src={meta?.picture} alt={name} />
        <AvatarFallback className="text-[10px]">{name.slice(0, 2).toUpperCase()}</AvatarFallback>
      </Avatar>
      <div className="min-w-0 flex-1">
        <p className="truncate text-xs font-bold text-white">{name}</p>
        <p className="text-[10px] text-gray-500">{result.amount.toLocaleString()} sats</p>
      </div>
      <StatusPill result={result} onCopy={copyInvoice} />
    </div>
  );
}

function StatusPill({ result, onCopy }: { result: CrewZapResult; onCopy: () => void }) {
  switch (result.status) {
    case 'success':
      return <span className="flex items-center gap-1 text-[10px] font-bold text-green-400"><Check className="h-3 w-3" /> Sent</span>;
    case 'resolving':
    case 'paying':
      return <span className="flex items-center gap-1 text-[10px] text-teal-400"><Loader2 className="h-3 w-3 animate-spin" /> {result.status === 'paying' ? 'Paying' : 'Resolving'}</span>;
    case 'skipped':
      return <span className="text-[10px] text-gray-500" title={result.error}>Skipped</span>;
    case 'failed':
      return result.invoice ? (
        <button type="button" onClick={onCopy} className="flex items-center gap-1 text-[10px] font-bold text-amber-400 hover:text-amber-300">
          <Copy className="h-3 w-3" /> Copy invoice
        </button>
      ) : (
        <span className="flex items-center gap-1 text-[10px] text-red-400" title={result.error}><AlertCircle className="h-3 w-3" /> Failed</span>
      );
    default:
      return <span className="text-[10px] text-gray-600">Waiting</span>;
  }
}

export function ZapCrewDialog({ crewName, recipients, children }: ZapCrewDialogProps) {
  const [open, setOpen] = useState(false);
  const { user } = useCurrentUser();
  const { preferredMethod } = useWallet();
  const { zapCrew, results, isRunning, reset } = useCrewZap();
  const [amount, setAmount] = useState<number | string>(1000);
  const [comment, setComment] = useState('');

  // Don't include the current user as a recipient (no zapping yourself).
  const payable = useMemo(
    () => recipients.filter((pk) => pk !== user?.pubkey),
    [recipients, user?.pubkey]
  );

  const numAmount = typeof amount === 'string' ? parseInt(amount, 10) || 0 : amount;
  const perHead = payable.length > 0 ? splitAmount(numAmount, payable.length) : [];
  const started = results.length > 0;
  const doneCount = results.filter((r) => r.status === 'success').length;
  const allDone = started && !isRunning;

  const handleZap = () => {
    if (numAmount <= 0 || payable.length === 0) return;
    zapCrew(payable, numAmount, comment || `Zapped the ${crewName} crew! 🤘`);
  };

  const handleOpenChange = (o: boolean) => {
    setOpen(o);
    if (!o) {
      reset();
      setAmount(1000);
      setComment('');
    }
  };

  if (!user) return <>{children}</>;

  return (
    <Dialog open={open} onOpenChange={handleOpenChange}>
      <DialogTrigger asChild>
        <div className="cursor-pointer">{children}</div>
      </DialogTrigger>
      <DialogContent className="max-w-md">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <Users className="h-5 w-5 text-teal-400" /> Zap the Crew
          </DialogTitle>
          <DialogDescription>
            Split a zap evenly across {payable.length} crew {payable.length === 1 ? 'member' : 'members'} with a Lightning address.
          </DialogDescription>
        </DialogHeader>

        {payable.length === 0 ? (
          <div className="py-6 text-center text-sm text-muted-foreground">
            No other crew members to zap right now.
          </div>
        ) : !started ? (
          <div className="space-y-4">
            <div>
              <Label className="text-xs uppercase tracking-wide text-muted-foreground">Total amount</Label>
              <ToggleGroup
                type="single"
                value={String(amount)}
                onValueChange={(v) => v && setAmount(parseInt(v, 10))}
                className="grid grid-cols-5 gap-1 mt-2"
              >
                {PRESETS.map((p) => (
                  <ToggleGroupItem key={p} value={String(p)} className="flex-col h-auto text-xs py-2">
                    <Zap className="h-3.5 w-3.5 mb-1" />
                    {p >= 1000 ? `${p / 1000}k` : p}
                  </ToggleGroupItem>
                ))}
              </ToggleGroup>
              <Input
                type="number"
                value={amount}
                onChange={(e) => setAmount(e.target.value)}
                placeholder="Custom total"
                className="mt-2 bg-gray-800 border-gray-700"
              />
            </div>

            {numAmount > 0 && (
              <p className="text-xs text-muted-foreground text-center">
                ≈ <span className="font-bold text-teal-400">{perHead[0]?.toLocaleString()}</span> sats each
                {perHead.length > 1 && perHead[0] !== perHead[perHead.length - 1] && ' (rounded)'}
              </p>
            )}

            <Textarea
              value={comment}
              onChange={(e) => setComment(e.target.value)}
              placeholder={`Zapped the ${crewName} crew! 🤘`}
              rows={2}
              className="bg-gray-800 border-gray-700 resize-none text-sm"
            />

            {preferredMethod === 'manual' && (
              <p className="flex items-start gap-1.5 rounded-lg border border-amber-500/30 bg-amber-500/10 p-2 text-[11px] text-amber-300">
                <AlertCircle className="mt-0.5 h-3.5 w-3.5 shrink-0" />
                No wallet connected — you'll get an invoice per member to pay manually. Connect a wallet for one-tap splitting.
              </p>
            )}

            <Button onClick={handleZap} disabled={numAmount <= 0} className="w-full bg-teal-500 hover:bg-teal-600 font-bold">
              <Zap className="h-4 w-4 mr-2" />
              Zap {numAmount.toLocaleString()} sats across {payable.length}
            </Button>
          </div>
        ) : (
          <div className="space-y-3">
            <div className="max-h-72 overflow-y-auto space-y-1.5">
              {results.map((r) => (
                <RecipientRow key={r.pubkey} result={r} />
              ))}
            </div>

            {allDone && (
              <div className="rounded-lg border border-gray-700 bg-black/40 p-3 text-center">
                <p className="text-sm font-bold text-white">
                  {doneCount > 0 ? `⚡ Sent to ${doneCount}/${payable.length}` : 'No auto-payments completed'}
                </p>
                <p className="text-xs text-muted-foreground mt-0.5">
                  {results.some((r) => r.status === 'failed' && r.invoice)
                    ? 'Copy any pending invoices to finish paying manually.'
                    : 'Thanks for supporting the crew!'}
                </p>
                <Button variant="outline" size="sm" onClick={() => handleOpenChange(false)} className="mt-3 border-gray-700">
                  <X className="h-3.5 w-3.5 mr-1" /> Close
                </Button>
              </div>
            )}

            {isRunning && (
              <p className="flex items-center justify-center gap-1.5 text-xs text-teal-400">
                <Loader2 className="h-3.5 w-3.5 animate-spin" /> Paying the crew…
              </p>
            )}
          </div>
        )}
      </DialogContent>
    </Dialog>
  );
}