"use client"

import { useState } from "react"
import Link from "next/link"
import { useRouter } from "next/navigation"
import { ArrowLeft, Ticket, Loader2, Save } from "lucide-react"
import api from "@/lib/axios"

export default function CreateCouponPage() {
  const router = useRouter()
  const [submitting, setSubmitting] = useState(false)
  const [error, setError] = useState("")

  const [code, setCode] = useState("")
  const [discount, setDiscount] = useState("")
  const [expiresAt, setExpiresAt] = useState("")

  async function onSubmit(e: React.FormEvent) {
    e.preventDefault()
    setError("")

    if (!code || !discount) {
      setError("Code and discount are required.")
      return
    }

    try {
      setSubmitting(true)
      await api.post("/admin/coupons", {
        code,
        discount: parseFloat(discount),
        expiresAt: expiresAt ? new Date(expiresAt).toISOString() : null,
        active: true
      })

      router.push("/admin/coupons")
      router.refresh()
    } catch (err: any) {
      setError(err.response?.data?.message || "Failed to create promo code.")
    } finally {
      setSubmitting(false)
    }
  }

  return (
    <div className="max-w-4xl mx-auto space-y-8">
      {/* HEADER SECTION */}
      <div className="flex flex-col space-y-2 pb-6 border-b border-zinc-100">
        <Link href="/admin/coupons" className="inline-flex items-center text-[10px] font-black uppercase tracking-widest text-zinc-400 hover:text-zinc-900 transition-colors mb-2">
          <ArrowLeft className="w-3 h-3 mr-1.5" />
          Back to Promo Codes
        </Link>
        <div className="flex items-center gap-3">
          <div className="w-12 h-12 bg-green-50 text-green-600 rounded-2xl flex items-center justify-center border border-green-100/50 shadow-sm">
            <Ticket className="w-5 h-5" />
          </div>
          <div>
            <h1 className="text-2xl font-black tracking-tight text-zinc-950">
              Create Promo Code
            </h1>
            <p className="text-[11px] font-bold uppercase tracking-widest text-zinc-400 mt-1">
              Issue a new promotional discount for your customers
            </p>
          </div>
        </div>
      </div>

      <form onSubmit={onSubmit} className="bg-white border border-zinc-150 rounded-3xl p-6 md:p-10 shadow-lg shadow-zinc-200/20 space-y-8 relative overflow-hidden">
        {/* Subtle Background Glow */}
        <div className="absolute top-0 right-0 -mr-20 -mt-20 w-64 h-64 bg-green-500/5 rounded-full blur-3xl pointer-events-none"></div>

        {error && (
          <div className="bg-red-50 border border-red-200 text-red-600 px-5 py-4 rounded-2xl text-xs font-bold flex items-center gap-3">
            <div className="w-8 h-8 bg-red-100 rounded-full flex items-center justify-center shrink-0">
              <span className="text-red-600 text-sm">!</span>
            </div>
            {error}
          </div>
        )}

        <div className="grid grid-cols-1 md:grid-cols-2 gap-8 relative z-10">
          <div className="space-y-3">
            <label className="block text-[10px] font-black uppercase tracking-widest text-zinc-950">
              Promo Code Alias
            </label>
            <div className="relative group">
              <Ticket className="absolute left-4 top-1/2 -translate-y-1/2 w-4 h-4 text-zinc-400 group-focus-within:text-green-500 transition-colors" />
              <input
                required
                value={code}
                onChange={(e) => setCode(e.target.value.toUpperCase().replace(/\s+/g, ''))}
                placeholder="e.g. SUMMER25"
                className="w-full pl-12 pr-4 py-4 border border-zinc-200 rounded-2xl focus:outline-none focus:ring-2 focus:ring-green-500/20 focus:border-green-500 font-mono font-bold text-zinc-900 uppercase tracking-widest bg-zinc-50 hover:bg-zinc-100/50 transition-all text-sm"
              />
            </div>
            <p className="text-[10px] text-zinc-500 font-medium leading-relaxed pl-1">This exact phrase will be used by customers at checkout.</p>
          </div>

          <div className="space-y-3">
            <label className="block text-[10px] font-black uppercase tracking-widest text-zinc-950">
              Discount Yield (%)
            </label>
            <div className="relative group">
              <span className="absolute left-5 top-1/2 -translate-y-1/2 font-black text-zinc-400 group-focus-within:text-green-500 transition-colors text-sm">%</span>
              <input
                required
                type="number"
                min="1"
                max="100"
                step="1"
                value={discount}
                onChange={(e) => setDiscount(e.target.value)}
                placeholder="25"
                className="w-full pl-12 pr-4 py-4 border border-zinc-200 rounded-2xl focus:outline-none focus:ring-2 focus:ring-green-500/20 focus:border-green-500 font-mono font-black text-zinc-900 bg-zinc-50 hover:bg-zinc-100/50 transition-all text-sm"
              />
            </div>
            <p className="text-[10px] text-zinc-500 font-medium leading-relaxed pl-1">Percentage deducted from the final cart subtotal.</p>
          </div>
        </div>

        <div className="space-y-3 relative z-10 pt-2">
          <label className="block text-[10px] font-black uppercase tracking-widest text-zinc-950">
            Expiration Timeline (Optional)
          </label>
          <div className="relative group max-w-md">
            <input
              type="datetime-local"
              value={expiresAt}
              onChange={(e) => setExpiresAt(e.target.value)}
              className="w-full px-4 py-4 border border-zinc-200 rounded-2xl focus:outline-none focus:ring-2 focus:ring-green-500/20 focus:border-green-500 font-medium text-zinc-900 bg-zinc-50 hover:bg-zinc-100/50 transition-all text-xs"
            />
          </div>
          <p className="text-[10px] text-zinc-500 font-medium leading-relaxed pl-1">Leave empty to create a permanent discount code.</p>
        </div>

        <div className="pt-8 border-t border-zinc-100 flex justify-end relative z-10">
          <button
            type="submit"
            disabled={submitting}
            className="bg-green-600 text-white px-8 py-4 rounded-2xl font-black uppercase tracking-widest text-[10px] hover:bg-green-500 hover:shadow-xl hover:shadow-green-600/20 hover:-translate-y-0.5 transition-all flex items-center gap-2.5 disabled:opacity-50 disabled:hover:translate-y-0 disabled:hover:shadow-none"
          >
            {submitting ? (
              <><Loader2 className="w-4 h-4 animate-spin" /> Issuing Code...</>
            ) : (
              <><Save className="w-4 h-4" /> Publish Promo Code</>
            )}
          </button>
        </div>
      </form>
    </div>
  )
}