import { useState, useEffect } from 'react'
import { createFileRoute, Link } from '@tanstack/react-router'
import { resetPassword } from '@/api/auth'

interface Branding {
  name: string | null
  hasLogo: boolean
}

export const Route = createFileRoute('/reset-password')({
  component: ResetPasswordPage,
})

function ResetPasswordPage() {
  const { token } = Route.useSearch() as { token?: string }
  const [password, setPassword] = useState('')
  const [confirmPassword, setConfirmPassword] = useState('')
  const [error, setError] = useState('')
  const [loading, setLoading] = useState(false)
  const [success, setSuccess] = useState(false)
  const [branding, setBranding] = useState<Branding | null>(null)

  useEffect(() => {
    fetch('/v1/store/branding')
      .then((r) => r.ok ? r.json() : null)
      .then((data) => { if (data) setBranding(data) })
      .catch(() => {})
  }, [])

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    setError('')

    if (!token) {
      setError('Missing reset token. Please use the link from your email.')
      return
    }

    if (password !== confirmPassword) {
      setError('Passwords do not match')
      return
    }

    if (password.length < 12) {
      setError('Password must be at least 12 characters')
      return
    }

    setLoading(true)
    try {
      await resetPassword(token, password)
      setSuccess(true)
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Reset failed. The link may have expired.')
    } finally {
      setLoading(false)
    }
  }

  return (
    <div
      className="flex min-h-screen items-center justify-center"
      style={{ background: 'linear-gradient(135deg, #0f1724 0%, #142038 100%)' }}
    >
      <div
        className="w-full max-w-sm rounded-xl border p-8 shadow-2xl"
        style={{ backgroundColor: '#131c2e', borderColor: '#1e2d45' }}
      >
        <div className="text-center mb-8">
          {branding?.hasLogo ? (
            <img src="/v1/store/logo" alt={branding.name ?? 'Store'} className="max-h-14 max-w-[220px] object-contain mx-auto" />
          ) : (
            <h1 className="text-3xl font-bold" style={{ color: '#d8dfe9' }}>{branding?.name ?? 'LunarFront'}</h1>
          )}
          {branding?.name ? (
            <p className="text-[10px] mt-2" style={{ color: '#4a5568' }}>Powered by <span style={{ color: '#6b7a8d' }}>LunarFront</span></p>
          ) : (
            <p className="text-sm mt-1" style={{ color: '#6b7a8d' }}>Small Business Management</p>
          )}
        </div>

        {success ? (
          <div className="text-center space-y-4">
            <p style={{ color: '#81c784' }}>Password reset successfully.</p>
            <Link
              to="/login"
              className="inline-block h-9 rounded-md border px-4 py-2 text-sm font-medium transition-colors"
              style={{ color: '#d0d8e0', borderColor: '#3a4a62' }}
            >
              Sign in
            </Link>
          </div>
        ) : !token ? (
          <div className="text-center space-y-4">
            <p style={{ color: '#e57373' }}>Invalid reset link. Please request a new one.</p>
            <Link
              to="/login"
              className="inline-block h-9 rounded-md border px-4 py-2 text-sm font-medium transition-colors"
              style={{ color: '#d0d8e0', borderColor: '#3a4a62' }}
            >
              Back to sign in
            </Link>
          </div>
        ) : (
          <>
            <h2 className="text-lg font-semibold text-center mb-4" style={{ color: '#d8dfe9' }}>Set new password</h2>
            <form onSubmit={handleSubmit} className="space-y-4">
              <div className="space-y-2">
                <label className="text-sm font-medium" style={{ color: '#b0bec5' }}>New password</label>
                <input
                  type="password"
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  required
                  minLength={12}
                  placeholder="At least 12 characters"
                  className="h-9 w-full rounded-md border px-3 py-1 text-sm outline-none login-input"
                />
              </div>
              <div className="space-y-2">
                <label className="text-sm font-medium" style={{ color: '#b0bec5' }}>Confirm password</label>
                <input
                  type="password"
                  value={confirmPassword}
                  onChange={(e) => setConfirmPassword(e.target.value)}
                  required
                  className="h-9 w-full rounded-md border px-3 py-1 text-sm outline-none login-input"
                />
              </div>
              {error && (
                <p className="text-sm" style={{ color: '#e57373' }}>{error}</p>
              )}
              <button
                type="submit"
                disabled={loading}
                className="h-9 w-full rounded-md border text-sm font-medium transition-colors disabled:opacity-50"
                style={{ backgroundColor: 'transparent', color: '#d0d8e0', borderColor: '#3a4a62' }}
                onMouseEnter={(e) => { (e.target as HTMLElement).style.backgroundColor = '#1e2d45' }}
                onMouseLeave={(e) => { (e.target as HTMLElement).style.backgroundColor = 'transparent' }}
              >
                {loading ? 'Resetting...' : 'Reset password'}
              </button>
              <div className="text-center">
                <Link to="/login" className="text-xs" style={{ color: '#6b7a8d' }}>
                  Back to sign in
                </Link>
              </div>
            </form>
          </>
        )}
      </div>
    </div>
  )
}