"use client"

import { useState } from "react"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { Lock, Search, CheckCircle2 } from "lucide-react"

interface Props {
  amount: number
  eventName: string
  onComplete: (identity: {
    donorName: string
    donorEmail: string
    donorPhone: string
    giftAid: boolean
  }) => void
}

interface Bank {
  code: string
  name: string
  shortName: string
  online: boolean
}

const FPX_BANKS: Bank[] = [
  { code: "MBB", name: "Maybank2u", shortName: "Maybank", online: true },
  { code: "CIMB", name: "CIMB Clicks", shortName: "CIMB", online: true },
  { code: "PBB", name: "PBe Bank", shortName: "Public Bank", online: true },
  { code: "RHB", name: "RHB Now", shortName: "RHB", online: true },
  { code: "HLB", name: "Hong Leong Connect", shortName: "Hong Leong", online: true },
  { code: "AMBB", name: "AmOnline", shortName: "AmBank", online: true },
  { code: "BIMB", name: "Bank Islam GO", shortName: "Bank Islam", online: true },
  { code: "BKRM", name: "i-Rakyat", shortName: "Bank Rakyat", online: true },
  { code: "BSN", name: "myBSN", shortName: "BSN", online: true },
  { code: "OCBC", name: "OCBC Online", shortName: "OCBC", online: true },
  { code: "UOB", name: "UOB Personal", shortName: "UOB", online: true },
  { code: "ABB", name: "Affin Online", shortName: "Affin Bank", online: true },
  { code: "ABMB", name: "Alliance Online", shortName: "Alliance Bank", online: true },
  { code: "BMMB", name: "Bank Muamalat", shortName: "Muamalat", online: true },
  { code: "SCB", name: "SC Online", shortName: "Standard Chartered", online: true },
  { code: "HSBC", name: "HSBC Online", shortName: "HSBC", online: true },
  { code: "AGR", name: "AGRONet", shortName: "Agrobank", online: true },
  { code: "KFH", name: "KFH Online", shortName: "KFH", online: true },
]

const BANK_COLORS: Record<string, string> = {
  MBB: "bg-yellow-500",
  CIMB: "bg-red-600",
  PBB: "bg-pink-700",
  RHB: "bg-blue-800",
  HLB: "bg-blue-600",
  AMBB: "bg-green-700",
  BIMB: "bg-emerald-700",
  BKRM: "bg-blue-900",
  BSN: "bg-orange-600",
  OCBC: "bg-red-700",
  UOB: "bg-blue-700",
  ABB: "bg-amber-700",
  ABMB: "bg-teal-700",
  BMMB: "bg-green-800",
  SCB: "bg-green-600",
  HSBC: "bg-red-500",
  AGR: "bg-green-900",
  KFH: "bg-yellow-700",
}

type Phase = "select" | "identity" | "redirecting" | "processing"

export function FpxPaymentStep({ amount, eventName, onComplete }: Props) {
  const [phase, setPhase] = useState<Phase>("select")
  const [selectedBank, setSelectedBank] = useState<Bank | null>(null)
  const [search, setSearch] = useState("")
  const [name, setName] = useState("")
  const [email, setEmail] = useState("")
  const [phone, setPhone] = useState("")
  const [errors, setErrors] = useState<Record<string, string>>({})

  const ringgit = (amount / 100).toFixed(2)

  const filteredBanks = search
    ? FPX_BANKS.filter(
        (b) =>
          b.name.toLowerCase().includes(search.toLowerCase()) ||
          b.shortName.toLowerCase().includes(search.toLowerCase()) ||
          b.code.toLowerCase().includes(search.toLowerCase())
      )
    : FPX_BANKS

  const handleBankSelect = (bank: Bank) => {
    setSelectedBank(bank)
  }

  const handleContinueToIdentity = () => {
    if (!selectedBank) return
    setPhase("identity")
  }

  const handleSubmit = async () => {
    const errs: Record<string, string> = {}
    if (!email.includes("@")) errs.email = "Valid email required"
    setErrors(errs)
    if (Object.keys(errs).length > 0) return

    setPhase("redirecting")

    // Simulate FPX redirect flow
    await new Promise((r) => setTimeout(r, 2000))
    setPhase("processing")
    await new Promise((r) => setTimeout(r, 1500))

    onComplete({
      donorName: name,
      donorEmail: email,
      donorPhone: phone,
      giftAid: false, // Gift Aid not applicable for MYR
    })
  }

  // Redirecting phase
  if (phase === "redirecting") {
    return (
      <div className="max-w-md mx-auto pt-16 text-center space-y-6">
        <div className="inline-flex items-center justify-center w-20 h-20 rounded-full bg-trust-blue/10">
          <div className="h-10 w-10 border-4 border-trust-blue border-t-transparent rounded-full animate-spin" />
        </div>
        <div className="space-y-2">
          <h1 className="text-2xl font-extrabold text-gray-900">
            Redirecting to {selectedBank?.name}
          </h1>
          <p className="text-muted-foreground">
            You&apos;ll be taken to your bank&apos;s secure login page to authorize the payment of <span className="font-bold text-foreground">RM{ringgit}</span>
          </p>
        </div>
        <div className="rounded-2xl bg-gray-50 border p-4">
          <div className="flex items-center justify-center gap-3">
            <div className={`w-10 h-10 rounded-lg ${BANK_COLORS[selectedBank?.code || ""] || "bg-gray-500"} flex items-center justify-center`}>
              <span className="text-white font-bold text-xs">{selectedBank?.code}</span>
            </div>
            <span className="font-semibold">{selectedBank?.name}</span>
          </div>
        </div>
        <p className="text-xs text-muted-foreground">
          Do not close this window. You will be redirected back automatically.
        </p>
      </div>
    )
  }

  // Processing phase
  if (phase === "processing") {
    return (
      <div className="max-w-md mx-auto pt-16 text-center space-y-6">
        <div className="inline-flex items-center justify-center w-20 h-20 rounded-full bg-success-green/10">
          <div className="h-10 w-10 border-4 border-success-green border-t-transparent rounded-full animate-spin" />
        </div>
        <div className="space-y-2">
          <h1 className="text-2xl font-extrabold text-gray-900">
            Processing Payment
          </h1>
          <p className="text-muted-foreground">
            Verifying your payment with {selectedBank?.shortName}...
          </p>
        </div>
      </div>
    )
  }

  // Identity phase
  if (phase === "identity") {
    return (
      <div className="max-w-md mx-auto pt-4 space-y-6">
        <div className="text-center space-y-2">
          <h1 className="text-2xl font-extrabold text-gray-900">Your Details</h1>
          <p className="text-muted-foreground">
            Before we redirect you to <span className="font-semibold text-foreground">{selectedBank?.name}</span>
          </p>
        </div>

        {/* Selected bank indicator */}
        <div className="rounded-2xl border-2 border-trust-blue/20 bg-trust-blue/5 p-4">
          <div className="flex items-center justify-between">
            <div className="flex items-center gap-3">
              <div className={`w-10 h-10 rounded-lg ${BANK_COLORS[selectedBank?.code || ""] || "bg-gray-500"} flex items-center justify-center`}>
                <span className="text-white font-bold text-xs">{selectedBank?.code}</span>
              </div>
              <div>
                <p className="font-semibold text-sm">{selectedBank?.name}</p>
                <p className="text-xs text-muted-foreground">FPX Online Banking</p>
              </div>
            </div>
            <div className="text-right">
              <p className="font-bold text-lg">RM{ringgit}</p>
              <p className="text-xs text-muted-foreground">{eventName}</p>
            </div>
          </div>
        </div>

        <div className="rounded-2xl border-2 border-gray-200 bg-white p-5 space-y-4">
          <div className="space-y-2">
            <Label htmlFor="fpx-name">Full Name <span className="text-muted-foreground font-normal">(optional)</span></Label>
            <Input
              id="fpx-name"
              placeholder="Your full name"
              value={name}
              onChange={(e) => setName(e.target.value)}
              autoComplete="name"
            />
          </div>

          <div className="space-y-2">
            <Label htmlFor="fpx-email">Email</Label>
            <Input
              id="fpx-email"
              type="email"
              placeholder="your@email.com"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              autoComplete="email"
              inputMode="email"
              className={errors.email ? "border-red-500" : ""}
            />
            {errors.email && <p className="text-xs text-red-500">{errors.email}</p>}
            <p className="text-xs text-muted-foreground">We&apos;ll send your receipt here</p>
          </div>

          <div className="space-y-2">
            <Label htmlFor="fpx-phone">Phone <span className="text-muted-foreground font-normal">(optional)</span></Label>
            <Input
              id="fpx-phone"
              type="tel"
              placeholder="+60 12-345 6789"
              value={phone}
              onChange={(e) => setPhone(e.target.value)}
              autoComplete="tel"
              inputMode="tel"
            />
          </div>
        </div>

        <Button size="xl" className="w-full" onClick={handleSubmit}>
          <Lock className="h-5 w-5 mr-2" />
          Pay RM{ringgit} via {selectedBank?.shortName}
        </Button>

        <div className="flex items-center justify-center gap-2 text-xs text-muted-foreground">
          <Lock className="h-3 w-3" />
          <span>Secured by FPX — Bank Negara Malaysia</span>
        </div>
      </div>
    )
  }

  // Bank selection phase (default)
  return (
    <div className="max-w-md mx-auto pt-4 space-y-5">
      <div className="text-center space-y-2">
        <h1 className="text-2xl font-extrabold text-gray-900">
          FPX Online Banking
        </h1>
        <p className="text-lg text-muted-foreground">
          Pay <span className="font-bold text-foreground">RM{ringgit}</span>{" "}
          for <span className="font-semibold text-foreground">{eventName}</span>
        </p>
      </div>

      {/* Search */}
      <div className="relative">
        <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-gray-400" />
        <Input
          placeholder="Search your bank..."
          value={search}
          onChange={(e) => setSearch(e.target.value)}
          className="pl-10"
        />
      </div>

      {/* Bank list */}
      <div className="grid grid-cols-2 gap-2 max-h-[400px] overflow-y-auto pr-1">
        {filteredBanks.map((bank) => (
          <button
            key={bank.code}
            onClick={() => handleBankSelect(bank)}
            className={`
              text-left rounded-xl border-2 p-3 transition-all active:scale-[0.98]
              ${selectedBank?.code === bank.code
                ? "border-trust-blue bg-trust-blue/5 shadow-md shadow-trust-blue/10"
                : "border-gray-200 bg-white hover:border-gray-300"
              }
            `}
          >
            <div className="flex items-center gap-2.5">
              <div className={`w-9 h-9 rounded-lg ${BANK_COLORS[bank.code] || "bg-gray-500"} flex items-center justify-center flex-shrink-0`}>
                <span className="text-white font-bold text-[10px] leading-none">{bank.code}</span>
              </div>
              <div className="min-w-0 flex-1">
                <p className="font-semibold text-xs text-gray-900 truncate">{bank.shortName}</p>
                <p className="text-[10px] text-muted-foreground truncate">{bank.name}</p>
              </div>
              {selectedBank?.code === bank.code && (
                <CheckCircle2 className="h-4 w-4 text-trust-blue flex-shrink-0" />
              )}
            </div>
          </button>
        ))}
      </div>

      {filteredBanks.length === 0 && (
        <p className="text-center text-sm text-muted-foreground py-4">No banks found matching &quot;{search}&quot;</p>
      )}

      {/* Continue */}
      <Button
        size="xl"
        className="w-full"
        disabled={!selectedBank}
        onClick={handleContinueToIdentity}
      >
        Continue with {selectedBank?.shortName || "selected bank"} →
      </Button>

      <div className="flex items-center justify-center gap-2 text-xs text-muted-foreground">
        <Lock className="h-3 w-3" />
        <span>Powered by FPX — regulated by Bank Negara Malaysia</span>
      </div>
    </div>
  )
}