"use client";

import { useState, type FormEvent } from "react";
import { pbSaveAuth } from "@/app/lib/pocketbase";

interface AuthModalProps {
  isOpen: boolean;
  onClose: () => void;
  onSuccess: (email: string) => void;
}

type AuthResult = {
  ok: boolean;
  token?: string;
  record?: { id: string; email?: string; [key: string]: unknown };
  error?: string;
  message?: string;
};

export default function AuthModal({ isOpen, onClose, onSuccess }: AuthModalProps) {
  const [mode, setMode] = useState<"login" | "register">("login");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [passwordConfirm, setPasswordConfirm] = useState("");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const handleSubmit = async (e: FormEvent) => {
    e.preventDefault();
    setError(null);
    setLoading(true);

    try {
      if (mode === "register") {
        if (password !== passwordConfirm) {
          setError("Passwords do not match");
          setLoading(false);
          return;
        }
        if (password.length < 8) {
          setError("Password must be at least 8 characters");
          setLoading(false);
          return;
        }
      }

      const endpoint = mode === "login" ? "/api/auth/login" : "/api/auth/register";
      const payload =
        mode === "login"
          ? { identity: email, password }
          : { email, password, passwordConfirm };

      const res = await fetch(endpoint, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        credentials: "include",
        body: JSON.stringify(payload),
      });
      const data = (await res.json().catch(() => ({}))) as AuthResult;

      if (!res.ok || !data?.ok || !data?.token || !data?.record) {
        throw new Error(data?.error || data?.message || "Authentication failed");
      }

      pbSaveAuth(data.token, { id: data.record.id, email: data.record.email ?? email });
      onSuccess(email);
      onClose();
      setEmail("");
      setPassword("");
      setPasswordConfirm("");
    } catch (err) {
      setError(err instanceof Error ? err.message : "Authentication failed");
    } finally {
      setLoading(false);
    }
  };

  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 z-[100] flex items-center justify-center">
      <div className="absolute inset-0 bg-black/50" onClick={onClose} aria-hidden />
      <div className="relative w-full max-w-sm rounded-2xl bg-white p-6 shadow-xl">
        <button
          onClick={onClose}
          className="absolute right-4 top-4 text-slate-400 hover:text-slate-600"
          aria-label="Close"
        >
          <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
          </svg>
        </button>

        <h2 className="text-xl font-bold text-slate-800">{mode === "login" ? "Login" : "Register"}</h2>
        <p className="mt-1 text-sm text-slate-500">
          {mode === "login" ? "Use email and password" : "Create a new account"}
        </p>

        <form onSubmit={handleSubmit} className="mt-6 space-y-4">
          <div>
            <label className="mb-1 block text-sm font-medium text-slate-700">Email</label>
            <input
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              placeholder="your@email.com"
              required
              className="w-full rounded-lg border border-slate-200 px-4 py-2.5 text-slate-800 placeholder-slate-400 focus:border-sky-500 focus:outline-none focus:ring-1 focus:ring-sky-500"
            />
          </div>
          <div>
            <label className="mb-1 block text-sm font-medium text-slate-700">Password</label>
            <input
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              placeholder="At least 8 characters"
              required
              minLength={mode === "register" ? 8 : 1}
              className="w-full rounded-lg border border-slate-200 px-4 py-2.5 text-slate-800 placeholder-slate-400 focus:border-sky-500 focus:outline-none focus:ring-1 focus:ring-sky-500"
            />
          </div>
          {mode === "register" && (
            <div>
              <label className="mb-1 block text-sm font-medium text-slate-700">Confirm Password</label>
              <input
                type="password"
                value={passwordConfirm}
                onChange={(e) => setPasswordConfirm(e.target.value)}
                placeholder="Enter password again"
                required
                className="w-full rounded-lg border border-slate-200 px-4 py-2.5 text-slate-800 placeholder-slate-400 focus:border-sky-500 focus:outline-none focus:ring-1 focus:ring-sky-500"
              />
            </div>
          )}
          {error && <p className="rounded-lg bg-red-50 px-3 py-2 text-sm text-red-600">{error}</p>}
          <button
            type="submit"
            disabled={loading}
            className="w-full rounded-lg bg-sky-500 py-3 font-semibold text-white transition-colors hover:bg-sky-600 disabled:opacity-70"
          >
            {loading ? "Processing..." : mode === "login" ? "Login" : "Register"}
          </button>
        </form>

        <p className="mt-4 text-center text-sm text-slate-500">
          {mode === "login" ? (
            <>
              No account?{" "}
              <button
                type="button"
                onClick={() => {
                  setMode("register");
                  setError(null);
                }}
                className="font-medium text-sky-500 hover:text-sky-600"
              >
                Register
              </button>
            </>
          ) : (
            <>
              Already have an account?{" "}
              <button
                type="button"
                onClick={() => {
                  setMode("login");
                  setError(null);
                }}
                className="font-medium text-sky-500 hover:text-sky-600"
              >
                Login
              </button>
            </>
          )}
        </p>
      </div>
    </div>
  );
}