"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import { ArrowDownLeftIcon, ArrowRightLeftIcon, ArrowUpRightIcon } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import {
  depositFunds,
  transferFunds,
  withdrawFunds,
} from "@/app/(frontend)/logistics/banking/actions";

type Mode = "deposit" | "withdraw" | "transfer";

const modeMeta: Record<
  Mode,
  { label: string; verb: string; description: string; icon: typeof ArrowDownLeftIcon }
> = {
  deposit: {
    label: "Deposit",
    verb: "Deposit",
    description: "Add funds to this account.",
    icon: ArrowDownLeftIcon,
  },
  withdraw: {
    label: "Withdraw",
    verb: "Withdraw",
    description: "Remove funds from this account.",
    icon: ArrowUpRightIcon,
  },
  transfer: {
    label: "Transfer",
    verb: "Transfer",
    description: "Move funds from this account to another account.",
    icon: ArrowRightLeftIcon,
  },
};

interface BankTransactionDialogProps {
  accountId: number;
  otherAccounts: { id: number; name: string }[];
}

export function BankTransactionDialog({
  accountId,
  otherAccounts,
}: BankTransactionDialogProps) {
  const router = useRouter();
  const [mode, setMode] = useState<Mode>("deposit");
  const [open, setOpen] = useState(false);
  const [amount, setAmount] = useState("");
  const [toId, setToId] = useState("");
  const [memo, setMemo] = useState("");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  function openMode(next: Mode) {
    setMode(next);
    setError(null);
    setOpen(true);
  }

  async function handleSubmit() {
    const value = Number(amount);
    if (!value || value <= 0) {
      setError("Enter a valid amount.");
      return;
    }
    if (mode === "transfer" && !toId) {
      setError("Select a destination account.");
      return;
    }
    setLoading(true);
    setError(null);
    const res =
      mode === "deposit"
        ? await depositFunds(accountId, value, memo || undefined)
        : mode === "withdraw"
          ? await withdrawFunds(accountId, value, memo || undefined)
          : await transferFunds(accountId, Number(toId), value, memo || undefined);

    if (res.success) {
      setOpen(false);
      setAmount("");
      setToId("");
      setMemo("");
      router.refresh();
    } else {
      setError(res.error ?? "Transaction failed.");
      setLoading(false);
    }
  }

  const meta = modeMeta[mode];
  const Icon = meta.icon;

  return (
    <>
      <div className="flex items-center gap-2">
        {(Object.keys(modeMeta) as Mode[]).map((m) => {
          const M = modeMeta[m];
          const Mc = M.icon;
          return (
            <Button
              key={m}
              size="sm"
              variant={mode === m ? "default" : "outline"}
              onClick={() => openMode(m)}
              className="font-mono text-xs uppercase tracking-wider"
            >
              <Mc className="size-4" />
              {M.label}
            </Button>
          );
        })}
      </div>

      <Dialog open={open} onOpenChange={setOpen}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle className="flex items-center gap-2">
              <Icon className="size-4" />
              {meta.verb} Funds
            </DialogTitle>
            <DialogDescription>{meta.description}</DialogDescription>
          </DialogHeader>
          <div className="flex flex-col gap-4">
            <div className="flex flex-col gap-1.5">
              <Label>Amount</Label>
              <Input
                type="number"
                min={1}
                value={amount}
                onChange={(e) => setAmount(e.target.value)}
                placeholder="0"
              />
            </div>
            {mode === "transfer" && (
              <div className="flex flex-col gap-1.5">
                <Label>Destination account</Label>
                <Select value={toId} onValueChange={setToId}>
                  <SelectTrigger>
                    <SelectValue placeholder="Select account" />
                  </SelectTrigger>
                  <SelectContent>
                    {otherAccounts.map((a) => (
                      <SelectItem key={a.id} value={String(a.id)}>
                        {a.name}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </div>
            )}
            <div className="flex flex-col gap-1.5">
              <Label>Memo (optional)</Label>
              <Textarea
                value={memo}
                onChange={(e) => setMemo(e.target.value)}
                placeholder="Reason / reference"
                rows={2}
              />
            </div>
            {error && <p className="text-sm text-red-400">{error}</p>}
          </div>
          <DialogFooter>
            <Button variant="outline" onClick={() => setOpen(false)}>
              Cancel
            </Button>
            <Button onClick={handleSubmit} disabled={loading}>
              {loading ? "Processing..." : meta.verb}
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </>
  );
}