"use client";

import { useState, useTransition } from "react";
import { useRouter } from "next/navigation";
import { toast } from "sonner";
import { createAdminRechargeCards } from "@/actions/admin/recharge-cards";
import { BooleanToggle } from "@/components/ui/boolean-toggle";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { getErrorMessage } from "@/lib/errors";

interface PlanOption {
  id: string;
  name: string;
  type: "PROXY" | "STREAMING";
  remainingCount: number | null;
}

export function RechargeCardForm({ plans }: { plans: PlanOption[] }) {
  const router = useRouter();
  const [type, setType] = useState<"BALANCE" | "PLAN">("BALANCE");
  const [planId, setPlanId] = useState(plans[0]?.id ?? "");
  const [hasExpiry, setHasExpiry] = useState(false);
  const [pending, startTransition] = useTransition();
  const selectedPlan = plans.find((plan) => plan.id === planId) ?? null;
  const planSoldOut = type === "PLAN" && selectedPlan?.remainingCount === 0;

  return (
    <form
      className="form-panel space-y-4"
      onSubmit={(event) => {
        event.preventDefault();
        const form = event.currentTarget;
        const formData = new FormData(form);
        formData.set("type", type);
        if (type === "PLAN") formData.set("planId", planId);
        startTransition(async () => {
          try {
            await createAdminRechargeCards(formData);
            toast.success("充值卡已生成");
            form.reset();
            setHasExpiry(false);
            router.refresh();
          } catch (error) {
            toast.error(getErrorMessage(error, "生成充值卡失败"));
          }
        });
      }}
    >
      <div className="flex items-center justify-between gap-3">
        <div>
          <h3 className="font-semibold">生成充值卡</h3>
          <p className="mt-1 text-sm text-muted-foreground">余额卡充值钱包，套餐卡兑换后直接激活套餐。</p>
        </div>
        <BooleanToggle
          value={type === "PLAN"}
          onChange={(value) => setType(value ? "PLAN" : "BALANCE")}
          trueLabel="套餐卡"
          falseLabel="余额卡"
          ariaLabel="充值卡类型"
          className="w-36"
        />
      </div>

      <input type="hidden" name="type" value={type} />

      <div className="grid gap-3 sm:grid-cols-2">
        <div className="space-y-2">
          <Label htmlFor="recharge-card-quantity">生成数量</Label>
          <Input
            id="recharge-card-quantity"
            name="quantity"
            type="number"
            min="1"
            max={type === "PLAN" && selectedPlan?.remainingCount != null ? Math.min(200, selectedPlan.remainingCount) : 200}
            defaultValue={1}
            required
          />
        </div>
        <div className="space-y-2">
          <Label htmlFor="recharge-card-batch">批次名称</Label>
          <Input id="recharge-card-batch" name="batchName" placeholder="五月活动" />
        </div>
      </div>

      {type === "BALANCE" ? (
        <div className="space-y-2">
          <Label htmlFor="recharge-card-amount">余额金额</Label>
          <Input id="recharge-card-amount" name="balanceAmount" type="number" min="0.01" step="0.01" placeholder="100.00" required />
        </div>
      ) : (
        <div className="space-y-2">
          <Label>绑定套餐</Label>
          <Select value={planId} onValueChange={(value) => setPlanId(value ?? "")}>
            <SelectTrigger className="w-full">
              <SelectValue placeholder="选择套餐">
                {(value) => {
                  const plan = plans.find((item) => item.id === value);
                  return plan
                    ? `${plan.name} · ${plan.type === "PROXY" ? "代理套餐" : "流媒体套餐"}`
                    : "选择套餐";
                }}
              </SelectValue>
            </SelectTrigger>
            <SelectContent>
              {plans.map((plan) => (
                <SelectItem key={plan.id} value={plan.id}>
                  {plan.name} · {plan.type === "PROXY" ? "代理套餐" : "流媒体套餐"} · 余 {plan.remainingCount ?? "不限"}
                </SelectItem>
              ))}
            </SelectContent>
          </Select>
          {selectedPlan && (
            <p className="text-xs text-muted-foreground">
              {selectedPlan.remainingCount == null ? "库存不限" : `当前可生成 ${selectedPlan.remainingCount} 张`}
            </p>
          )}
        </div>
      )}

      <div className="space-y-2">
        <Label htmlFor="recharge-card-expiry-mode">有效期</Label>
        <BooleanToggle
          id="recharge-card-expiry-mode"
          value={hasExpiry}
          onChange={setHasExpiry}
          trueLabel="设置到期"
          falseLabel="永不过期"
          ariaLabel="充值卡有效期"
        />
      </div>

      {hasExpiry && (
        <div className="space-y-2">
          <Label htmlFor="recharge-card-expires">到期时间</Label>
          <Input id="recharge-card-expires" name="expiresAt" type="datetime-local" required />
        </div>
      )}

      {!hasExpiry && (
        <input type="hidden" name="expiresAt" value="" />
      )}

      {type === "PLAN" && plans.length === 0 && (
        <div className="rounded-lg border border-destructive/15 bg-destructive/10 px-3 py-2 text-xs font-medium text-destructive">
          暂无可用套餐，请先上架套餐。
        </div>
      )}

      <Button type="submit" className="w-full" disabled={pending || (type === "PLAN" && (!planId || planSoldOut))}>
        {pending ? "生成中..." : planSoldOut ? "套餐已售罄" : "生成充值卡"}
      </Button>
    </form>
  );
}