From 66b4868c6f92f17a1e8f8746176fe708da626b05 Mon Sep 17 00:00:00 2001
From: Oliver Bryan <04oliverbryan@gmail.com>
Date: Mon, 22 Dec 2025 06:33:58 +0000
Subject: [PATCH] login form component

---
 .../frontend/src/components/login-form.tsx    | 127 ++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 packages/frontend/src/components/login-form.tsx

diff --git a/packages/frontend/src/components/login-form.tsx b/packages/frontend/src/components/login-form.tsx
new file mode 100644
index 0000000..86219f9
--- /dev/null
+++ b/packages/frontend/src/components/login-form.tsx
@@ -0,0 +1,127 @@
+import { type ChangeEvent, useState } from "react";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { cn, getAuthHeaders } from "@/lib/utils";
+
+function Field({
+    label = "label",
+    onChange = () => {},
+    invalidMessage = "",
+    hidden = false,
+}: {
+    label: string;
+    onChange?: (e: ChangeEvent<HTMLInputElement>) => void;
+    invalidMessage?: string;
+    hidden?: boolean;
+}) {
+    return (
+        <div className="flex flex-col gap-1">
+            <div className="flex items-end justify-between w-full text-xs">
+                <Label className="flex items-center text-sm">{label}</Label>
+            </div>
+            <Input
+                placeholder={label}
+                onChange={onChange}
+                aria-invalid={invalidMessage !== ""}
+                type={hidden ? "password" : "text"}
+            />
+            <div className="flex items-end justify-end w-full text-xs -mb-4">
+                {invalidMessage !== "" ? (
+                    <Label className="text-destructive text-sm">{invalidMessage}</Label>
+                ) : (
+                    <Label className="opacity-0 text-sm">a</Label>
+                )}
+            </div>
+        </div>
+    );
+}
+
+export default function LogInForm() {
+    const serverURL = import.meta.env.SERVER_URL?.trim() || "http://localhost:3000";
+
+    const [username, setUsername] = useState("");
+    const [usernameInvalid, setUsernameInvalid] = useState("");
+    const [password, setPassword] = useState("");
+    const [passwordInvalid, setPasswordInvalid] = useState("");
+    const [error, setError] = useState("");
+
+    const logIn = () => {
+        if (username === "" || password === "") {
+            if (username === "") {
+                setUsernameInvalid("Cannot be empty");
+            }
+            if (password === "") {
+                setPasswordInvalid("Cannot be empty");
+            }
+            return;
+        }
+
+        fetch(`${serverURL}/auth/login`, {
+            method: "POST",
+            headers: { "Content-Type": "application/json", ...getAuthHeaders() },
+
+            body: JSON.stringify({ username, password }),
+        })
+            .then(async (res) => {
+                if (res.status === 200) {
+                    setError("");
+                    const data = await res.json();
+                    localStorage.setItem("token", data.token);
+                    localStorage.setItem("user", data.user);
+                    window.location.href = "/";
+                }
+                // unauthorized
+                else if (res.status === 401) {
+                    setError("Either the username or password is incorrect");
+                } else {
+                    setError("An unknown error occured.");
+                }
+            })
+            .catch((err) => {
+                console.error(err);
+                setError(`${err.statusText}`);
+            });
+    };
+
+    return (
+        <div>
+            <div
+                className={cn(
+                    "flex flex-col gap-2 items-center border p-8",
+                    error !== "" && "border-destructive",
+                )}
+            >
+                <Field
+                    label="Username"
+                    onChange={(e) => {
+                        if (e.target.value !== "") setUsernameInvalid("");
+                        else setUsernameInvalid("Cannot be empty");
+                        setUsername(e.target.value);
+                    }}
+                    invalidMessage={usernameInvalid}
+                />
+                <Field
+                    label="Password"
+                    onChange={(e) => {
+                        if (e.target.value !== "") setPasswordInvalid("");
+                        else setPasswordInvalid("Cannot be empty");
+                        setPassword(e.target.value);
+                    }}
+                    invalidMessage={passwordInvalid}
+                    hidden={true}
+                />
+                <Button variant={"outline"} onClick={logIn} className={"mt-4"} type={"submit"}>
+                    Log in
+                </Button>
+            </div>
+            <div className="flex items-end justify-end w-full text-xs -mb-4">
+                {error !== "" ? (
+                    <Label className="text-destructive text-sm">{error}</Label>
+                ) : (
+                    <Label className="opacity-0 text-sm">a</Label>
+                )}
+            </div>
+        </div>
+    );
+}