import { useState } from 'react'
import { useNavigate } from 'react-router-dom'
import { ArrowRight, PhoneForwarded, PhoneOutgoing, User } from 'lucide-react'
import { useZino } from '../zino-sdk'
import { BRAND, MODELS } from '../config'
import { isPlausiblePhone, placeCall, toE164 } from '../api'

export default function PlaceCall() {
  const { client } = useZino()
  const navigate = useNavigate()

  const [leadName, setLeadName] = useState('')
  const [modelInterest, setModelInterest] = useState<string>(MODELS[0])
  const [leadPhone, setLeadPhone] = useState('')
  const [handoverNumber, setHandoverNumber] = useState('')
  const [error, setError] = useState('')
  const [busy, setBusy] = useState(false)

  // Both numbers joining the same conference would put the tester on hold with
  // themselves — catch it here rather than on a live call.
  const sameNumber =
    leadPhone && handoverNumber && toE164(leadPhone) === toE164(handoverNumber)

  const canSubmit =
    leadName.trim() &&
    isPlausiblePhone(leadPhone) &&
    isPlausiblePhone(handoverNumber) &&
    !sameNumber &&
    !busy

  const submit = async (e: React.FormEvent) => {
    e.preventDefault()
    if (!canSubmit) return
    setBusy(true)
    setError('')
    try {
      await placeCall(client, {
        leadName: leadName.trim(),
        leadPhone: toE164(leadPhone),
        modelInterest,
        handoverNumber: toE164(handoverNumber),
      })
      navigate('/monitor')
    } catch (err: any) {
      setError(err?.message || 'Could not place the call')
      setBusy(false)
    }
  }

  return (
    <div className="mx-auto max-w-2xl">
      <h1 className="text-xl font-semibold">Place a call</h1>
      <p className="mt-1 text-sm text-slate-500">
        {BRAND.agentName} calls the customer and qualifies the {BRAND.name} EV lead. When the
        caller asks for a person — or pushes on price — she announces a transfer and bridges
        the colleague below into the same call, then keeps listening to brief them.
      </p>

      <form
        onSubmit={submit}
        className="mt-6 space-y-5 rounded-2xl border border-slate-200 bg-white p-6 shadow-sm"
      >
        <div className="grid gap-5 sm:grid-cols-2">
          <div>
            <label className="mb-1 flex items-center gap-1.5 text-xs font-medium text-slate-600">
              <User size={13} /> Lead name
            </label>
            <input
              value={leadName}
              onChange={(e) => setLeadName(e.target.value)}
              placeholder="Yashas"
              className="w-full rounded-lg border border-slate-300 px-3 py-2 text-sm outline-none focus:border-red-500 focus:ring-2 focus:ring-red-100"
            />
          </div>

          <div>
            <label className="mb-1 block text-xs font-medium text-slate-600">
              Model of interest
            </label>
            <select
              value={modelInterest}
              onChange={(e) => setModelInterest(e.target.value)}
              className="w-full rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm outline-none focus:border-red-500 focus:ring-2 focus:ring-red-100"
            >
              {MODELS.map((m) => (
                <option key={m} value={m}>
                  {m}
                </option>
              ))}
            </select>
          </div>
        </div>

        <div className="grid items-start gap-4 rounded-xl bg-slate-50 p-4 sm:grid-cols-[1fr_auto_1fr]">
          <PhoneBox
            icon={<PhoneOutgoing size={13} />}
            label={`Customer — ${BRAND.agentName} calls this`}
            value={leadPhone}
            onChange={setLeadPhone}
            accent="red"
          />

          <div className="hidden self-center pt-6 text-slate-400 sm:block">
            <ArrowRight size={18} />
          </div>

          <PhoneBox
            icon={<PhoneForwarded size={13} />}
            label="Colleague — transfer bridges to this"
            value={handoverNumber}
            onChange={setHandoverNumber}
            accent="indigo"
          />
        </div>

        {sameNumber && (
          <p className="rounded-lg bg-amber-50 px-3 py-2 text-xs text-amber-800">
            Both numbers are the same — the transfer would conference you with yourself.
            Use two different phones.
          </p>
        )}

        {error && (
          <p className="rounded-lg bg-red-50 px-3 py-2 text-xs text-red-700">{error}</p>
        )}

        <div className="flex items-center gap-3 pt-1">
          <button
            type="submit"
            disabled={!canSubmit}
            className="inline-flex items-center gap-2 rounded-lg bg-red-600 px-5 py-2.5 text-sm font-semibold text-white transition-colors hover:bg-red-700 disabled:cursor-not-allowed disabled:opacity-40"
          >
            <PhoneOutgoing size={16} />
            {busy ? 'Placing call…' : 'Place call'}
          </button>
          <span className="text-xs text-slate-500">
            The customer's phone rings within a few seconds.
          </span>
        </div>
      </form>
    </div>
  )
}

function PhoneBox({
  icon,
  label,
  value,
  onChange,
  accent,
}: {
  icon: React.ReactNode
  label: string
  value: string
  onChange: (v: string) => void
  accent: 'red' | 'indigo'
}) {
  const normalised = toE164(value)
  const valid = isPlausiblePhone(value)
  const ring =
    accent === 'red'
      ? 'focus:border-red-500 focus:ring-red-100'
      : 'focus:border-indigo-500 focus:ring-indigo-100'

  return (
    <div>
      <label className="mb-1 flex items-center gap-1.5 text-xs font-medium text-slate-600">
        {icon} {label}
      </label>
      <input
        value={value}
        onChange={(e) => onChange(e.target.value)}
        placeholder="+91 98765 43210"
        inputMode="tel"
        className={`w-full rounded-lg border border-slate-300 bg-white px-3 py-2 font-mono text-sm outline-none focus:ring-2 ${ring}`}
      />
      {/* Show what will actually be dialled — the operator types loosely, the
          carrier needs E.164, and a silent rewrite is worth surfacing. */}
      <p className="mt-1 h-4 text-[11px] text-slate-500">
        {value && (valid ? `Dials as ${normalised}` : 'Needs 10 digits, or +country code')}
      </p>
    </div>
  )
}