// app/(account)/account/page.tsx
"use client";

import { useMemo, useState } from "react";
import { useSearchParams, useRouter } from "next/navigation";
import { useAuth } from "@/context/AuthContext";

const API_BASE_URL =
  process.env.NEXT_PUBLIC_API_BASE_URL ?? "http://localhost:8080";

export default function AccountPage() {
  const { user, loading, token, setSession, logout } = useAuth();
  const searchParams = useSearchParams();
  const router = useRouter();

  const welcome = searchParams.get("welcome") === "1";

  const needsDisplayName = useMemo(() => {
    return !user?.displayName || user.displayName.trim().length === 0;
  }, [user?.displayName]);

  // Only show welcome panel if they actually need setup
  const showWelcomeCard = welcome && needsDisplayName;

  // ----------------------------
  // Display Name state (shared)
  // ----------------------------
  const [displayName, setDisplayName] = useState(user?.displayName ?? "");
  const [saving, setSaving] = useState(false);
  const [msg, setMsg] = useState<string | null>(null);

  // Inline profile editor
  const [editingName, setEditingName] = useState(false);

  // ----------------------------
  // Password state
  // ----------------------------
  const [showPassword, setShowPassword] = useState(false);
  const [pw1, setPw1] = useState("");
  const [pw2, setPw2] = useState("");
  const [pwSaving, setPwSaving] = useState(false);
  const [pwMsg, setPwMsg] = useState<string | null>(null);

  const canSaveName = useMemo(() => {
    return displayName.trim().length > 0 && !saving;
  }, [displayName, saving]);

  const pwMismatch = useMemo(
    () => pw1.length > 0 && pw2.length > 0 && pw1 !== pw2,
    [pw1, pw2]
  );
  const pwTooShort = useMemo(() => pw1.length > 0 && pw1.length < 8, [pw1]);
  const canSavePassword = useMemo(() => {
    return !pwSaving && pw1.length >= 8 && pw1 === pw2;
  }, [pwSaving, pw1, pw2]);

  if (loading) return <div className="text-sm opacity-70">Loading…</div>;

  if (!user) {
    return (
      <div className="text-sm opacity-70">
        You’re not logged in. Please log in to view your account.
      </div>
    );
  }
  const authedUser = user; // user is non-null from here down

  async function saveDisplayName() {
    setSaving(true);
    setMsg(null);

    try {
      const nextName = displayName.trim();

      const res = await fetch(`${API_BASE_URL}/api/users/me`, {
        method: "PATCH",
        headers: {
          "Content-Type": "application/json",
          ...(token ? { Authorization: `Bearer ${token}` } : {}),
        },
        body: JSON.stringify({ displayName: nextName }),
      });

      if (!res.ok) {
        const text = await res.text().catch(() => "");
        throw new Error(text || "Failed to update profile");
      }

      const updated = await res.json().catch(() => null);

      const nextUser = {
        email: authedUser.email,
        displayName: updated?.displayName ?? nextName,
        role: authedUser.role,
      };

      if (token) setSession(token, nextUser);

      setMsg("Saved ✅");
      setEditingName(false);

      // If we came from the welcome flow, clear the param
      if (welcome) router.replace("/account");
    } catch (e: any) {
      setMsg(e?.message || "Couldn’t save. Try again.");
    } finally {
      setSaving(false);
    }
  }

  async function savePassword() {
    setPwMsg(null);

    if (pw1.length < 8) {
      setPwMsg("Password must be at least 8 characters.");
      return;
    }
    if (pw1 !== pw2) {
      setPwMsg("Passwords don’t match.");
      return;
    }

    setPwSaving(true);

    try {
      const res = await fetch(`${API_BASE_URL}/api/users/me/password`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          ...(token ? { Authorization: `Bearer ${token}` } : {}),
        },
        body: JSON.stringify({ password: pw1 }),
      });

      if (!res.ok) {
        const text = await res.text().catch(() => "");
        throw new Error(text || "Failed to set password");
      }

      setPwMsg("Password set ✅ You can now use email + password login.");
      setPw1("");
      setPw2("");
      setShowPassword(false);

      if (welcome) router.replace("/account");
    } catch (e: any) {
      setPwMsg(e?.message || "Couldn’t set password. Try again.");
    } finally {
      setPwSaving(false);
    }
  }

  return (
    <div className="space-y-6">
      {/* Welcome / Setup card (only if needed) */}
      {showWelcomeCard && (
        <div className="rounded-xl border border-amber-500/30 bg-amber-500/10 p-4 space-y-4">
          <div>
            <h2 className="text-base font-semibold">Welcome to the beta 👋</h2>
            <p className="text-sm text-zinc-300/80">
              Quick setup and you’re ready to cook.
            </p>
          </div>

          {/* Display name */}
          <div className="space-y-2">
            <label className="text-xs font-medium text-zinc-200">
              Display name
            </label>
            <input
              value={displayName}
              onChange={(e) => setDisplayName(e.target.value)}
              placeholder="e.g. Sean / S2Tactical / DirtNinja69"
              className="w-full rounded-md border border-white/10 bg-black/40 px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-amber-500/40"
            />
            <div className="flex items-center gap-3">
              <button
                onClick={saveDisplayName}
                disabled={!canSaveName}
                className="rounded-md bg-amber-400 px-3 py-2 text-sm font-medium text-black disabled:opacity-50"
              >
                {saving ? "Saving…" : "Save"}
              </button>
              {msg && (
                <span
                  className={`text-xs ${
                    msg.toLowerCase().includes("couldn")
                      ? "text-red-300"
                      : "text-zinc-200/80"
                  }`}
                >
                  {msg}
                </span>
              )}
            </div>
          </div>

          {/* Password */}
          <div className="pt-2 border-t border-white/10">
            <p className="text-xs text-zinc-300/80">
              Want password login later? Optional (but recommended).
            </p>

            {!showPassword ? (
              <button
                onClick={() => setShowPassword(true)}
                className="mt-2 text-xs underline opacity-80 hover:opacity-100"
              >
                Set a password
              </button>
            ) : (
              <div className="mt-3 space-y-2">
                <input
                  type="password"
                  value={pw1}
                  onChange={(e) => setPw1(e.target.value)}
                  placeholder="New password (min 8 chars)"
                  className="w-full rounded-md border border-white/10 bg-black/40 px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-amber-500/40"
                />
                <input
                  type="password"
                  value={pw2}
                  onChange={(e) => setPw2(e.target.value)}
                  placeholder="Confirm password"
                  className="w-full rounded-md border border-white/10 bg-black/40 px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-amber-500/40"
                />

                {(pwTooShort || pwMismatch) && (
                  <div className="text-xs text-red-300">
                    {pwTooShort
                      ? "Password must be at least 8 characters."
                      : "Passwords don’t match."}
                  </div>
                )}

                <div className="flex items-center gap-3">
                  <button
                    onClick={savePassword}
                    disabled={!canSavePassword}
                    className="rounded-md bg-amber-400 px-3 py-2 text-sm font-medium text-black disabled:opacity-50"
                  >
                    {pwSaving ? "Saving…" : "Save password"}
                  </button>
                  <button
                    onClick={() => {
                      setShowPassword(false);
                      setPw1("");
                      setPw2("");
                      setPwMsg(null);
                    }}
                    className="text-xs opacity-80 hover:opacity-100"
                  >
                    Cancel
                  </button>
                </div>

                {pwMsg && (
                  <div
                    className={`text-xs ${
                      pwMsg.toLowerCase().includes("couldn")
                        ? "text-red-300"
                        : "text-zinc-200/80"
                    }`}
                  >
                    {pwMsg}
                  </div>
                )}
              </div>
            )}
          </div>
        </div>
      )}

      {/* Profile header */}
      <div>
        <h2 className="text-lg font-semibold">Profile</h2>
        <p className="text-sm opacity-70">Basic account info.</p>
      </div>

      {/* Profile card */}
      <div className="rounded-xl border border-white/10 bg-white/5 p-4 space-y-3">
        <div className="text-sm">
          <span className="opacity-70">Email:</span>{" "}
          <span className="font-medium">{user.email}</span>
        </div>

        {/* Display name (inline editable) */}
        <div className="text-sm">
          <span className="opacity-70">Display name:</span>{" "}
          {!editingName ? (
            <>
              <span className="font-medium">{user.displayName || "—"}</span>
              <button
                onClick={() => {
                  setEditingName(true);
                  setMsg(null);
                  setDisplayName(user.displayName ?? "");
                }}
                className="ml-3 text-xs underline opacity-70 hover:opacity-100"
              >
                Edit
              </button>
            </>
          ) : (
            <div className="mt-2 space-y-2">
              <input
                value={displayName}
                onChange={(e) => setDisplayName(e.target.value)}
                placeholder="Your display name"
                className="w-full rounded-md border border-white/10 bg-black/40 px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-amber-500/40"
              />

              <div className="flex items-center gap-3">
                <button
                  onClick={saveDisplayName}
                  disabled={!canSaveName}
                  className="rounded-md bg-amber-400 px-3 py-2 text-xs font-medium text-black disabled:opacity-50"
                >
                  {saving ? "Saving…" : "Save"}
                </button>
                <button
                  onClick={() => {
                    setEditingName(false);
                    setDisplayName(user.displayName ?? "");
                    setMsg(null);
                  }}
                  className="text-xs opacity-80 hover:opacity-100"
                >
                  Cancel
                </button>
                {msg && (
                  <span
                    className={`text-xs ${
                      msg.toLowerCase().includes("couldn")
                        ? "text-red-300"
                        : "text-zinc-200/80"
                    }`}
                  >
                    {msg}
                  </span>
                )}
              </div>
            </div>
          )}
        </div>

        <div className="text-sm">
          <span className="opacity-70">Role:</span>{" "}
          <span className="font-medium">{user.role}</span>
        </div>

        <div className="pt-3 border-t border-white/10 flex items-center justify-between">
          <button
            onClick={logout}
            className="rounded-md border border-white/10 px-3 py-2 text-xs opacity-80 hover:opacity-100"
          >
            Log out
          </button>

          {/* Optional: quick link to set password later */}
          <button
            onClick={() => {
              setShowPassword(true);
              // Scroll user’s attention to welcome panel area if it exists,
              // otherwise just open the password UI in their mind.
              // (Kept simple: you can add a dedicated card later if you want)
              setPwMsg(null);
            }}
            className="text-xs underline opacity-70 hover:opacity-100"
          >
            Set / change password
          </button>
        </div>

        {/* If user clicks "Set/change password" outside welcome flow, show it here */}
        {!showWelcomeCard && showPassword && (
          <div className="pt-4 border-t border-white/10 space-y-2">
            <div className="text-sm font-medium">Set password</div>
            <input
              type="password"
              value={pw1}
              onChange={(e) => setPw1(e.target.value)}
              placeholder="New password (min 8 chars)"
              className="w-full rounded-md border border-white/10 bg-black/40 px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-amber-500/40"
            />
            <input
              type="password"
              value={pw2}
              onChange={(e) => setPw2(e.target.value)}
              placeholder="Confirm password"
              className="w-full rounded-md border border-white/10 bg-black/40 px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-amber-500/40"
            />

            {(pwTooShort || pwMismatch) && (
              <div className="text-xs text-red-300">
                {pwTooShort
                  ? "Password must be at least 8 characters."
                  : "Passwords don’t match."}
              </div>
            )}

            <div className="flex items-center gap-3">
              <button
                onClick={savePassword}
                disabled={!canSavePassword}
                className="rounded-md bg-amber-400 px-3 py-2 text-sm font-medium text-black disabled:opacity-50"
              >
                {pwSaving ? "Saving…" : "Save password"}
              </button>
              <button
                onClick={() => {
                  setShowPassword(false);
                  setPw1("");
                  setPw2("");
                  setPwMsg(null);
                }}
                className="text-xs opacity-80 hover:opacity-100"
              >
                Cancel
              </button>
            </div>

            {pwMsg && (
              <div
                className={`text-xs ${
                  pwMsg.toLowerCase().includes("couldn")
                    ? "text-red-300"
                    : "text-zinc-200/80"
                }`}
              >
                {pwMsg}
              </div>
            )}
          </div>
        )}
      </div>
    </div>
  );
}