feat: Add contract editing functionality with form handling and translations

src/app/api/contracts/[id]/route.js

@@ -1,6 +1,6 @@
 import db from "@/lib/db";
 import { NextResponse } from "next/server";
-import { withReadAuth, withTeamLeadAuth } from "@/lib/middleware/auth";
+import { withReadAuth, withTeamLeadAuth, withUserAuth } from "@/lib/middleware/auth";
 
 async function getContractHandler(req, { params }) {
 	const { id } = await params;
@@ -21,6 +21,79 @@ async function getContractHandler(req, { params }) {
 	return NextResponse.json(contract);
 }
 
+async function updateContractHandler(req, { params }) {
+	const { id } = await params;
+
+	try {
+		const body = await req.json();
+		const {
+			contract_number,
+			contract_name,
+			customer_contract_number,
+			customer,
+			investor,
+			date_signed,
+			finish_date,
+		} = body;
+
+		// Check if contract exists
+		const existingContract = db
+			.prepare("SELECT * FROM contracts WHERE contract_id = ?")
+			.get(id);
+
+		if (!existingContract) {
+			return NextResponse.json(
+				{ error: "Contract not found" },
+				{ status: 404 }
+			);
+		}
+
+		// Update the contract
+		const result = db
+			.prepare(
+				`UPDATE contracts 
+				SET contract_number = ?, 
+					contract_name = ?, 
+					customer_contract_number = ?, 
+					customer = ?, 
+					investor = ?, 
+					date_signed = ?, 
+					finish_date = ?
+				WHERE contract_id = ?`
+			)
+			.run(
+				contract_number,
+				contract_name || null,
+				customer_contract_number || null,
+				customer || null,
+				investor || null,
+				date_signed || null,
+				finish_date || null,
+				id
+			);
+
+		if (result.changes === 0) {
+			return NextResponse.json(
+				{ error: "Failed to update contract" },
+				{ status: 500 }
+			);
+		}
+
+		// Fetch and return the updated contract
+		const updatedContract = db
+			.prepare("SELECT * FROM contracts WHERE contract_id = ?")
+			.get(id);
+
+		return NextResponse.json(updatedContract);
+	} catch (error) {
+		console.error("Error updating contract:", error);
+		return NextResponse.json(
+			{ error: "Internal server error" },
+			{ status: 500 }
+		);
+	}
+}
+
 async function deleteContractHandler(req, { params }) {
 	const { id } = params;
 
@@ -61,4 +134,5 @@ async function deleteContractHandler(req, { params }) {
 
 // Protected routes - require authentication  
 export const GET = withReadAuth(getContractHandler);
+export const PUT = withUserAuth(updateContractHandler);
 export const DELETE = withTeamLeadAuth(deleteContractHandler);

src/app/contracts/[id]/edit/page.js

@@ -0,0 +1,139 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { useParams } from "next/navigation";
+import ContractForm from "@/components/ContractForm";
+import PageContainer from "@/components/ui/PageContainer";
+import PageHeader from "@/components/ui/PageHeader";
+import Button from "@/components/ui/Button";
+import Link from "next/link";
+import { LoadingState } from "@/components/ui/States";
+import { useTranslation } from "@/lib/i18n";
+
+export default function EditContractPage() {
+	const params = useParams();
+	const id = params.id;
+	const [contract, setContract] = useState(null);
+	const [loading, setLoading] = useState(true);
+	const [error, setError] = useState(null);
+	const { t } = useTranslation();
+
+	useEffect(() => {
+		async function fetchContract() {
+			setLoading(true);
+			setError(null);
+			try {
+				const res = await fetch(`/api/contracts/${id}`);
+				
+				if (!res.ok) {
+					throw new Error("Failed to fetch contract");
+				}
+				
+				const data = await res.json();
+				setContract(data);
+			} catch (error) {
+				console.error("Error fetching contract:", error);
+				setError("Nie udało się pobrać danych umowy.");
+			} finally {
+				setLoading(false);
+			}
+		}
+
+		if (id) {
+			fetchContract();
+		}
+	}, [id]);
+
+	if (loading) {
+		return (
+			<PageContainer>
+				<PageHeader
+					title={t('contracts.editContract')}
+					description={t('contracts.editContractDescription')}
+				/>
+				<LoadingState message={t('navigation.loading')} />
+			</PageContainer>
+		);
+	}
+
+	if (error || !contract) {
+		return (
+			<PageContainer>
+				<PageHeader
+					title={t('contracts.editContract')}
+					description={t('contracts.editContractDescription')}
+				/>
+				<div className="bg-red-50 border border-red-200 rounded-lg p-4 flex items-start mb-6">
+					<svg
+						className="w-5 h-5 text-red-600 mr-3 mt-0.5 flex-shrink-0"
+						fill="none"
+						stroke="currentColor"
+						viewBox="0 0 24 24"
+					>
+						<path
+							strokeLinecap="round"
+							strokeLinejoin="round"
+							strokeWidth={2}
+							d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"
+						/>
+					</svg>
+					<div className="flex-1">
+						<p className="text-sm font-medium text-red-800">
+							{error || "Nie znaleziono umowy."}
+						</p>
+					</div>
+				</div>
+				<Link href="/contracts">
+					<Button variant="outline">
+						<svg
+							className="w-4 h-4 mr-2"
+							fill="none"
+							stroke="currentColor"
+							viewBox="0 0 24 24"
+						>
+							<path
+								strokeLinecap="round"
+								strokeLinejoin="round"
+								strokeWidth={2}
+								d="M15 19l-7-7 7-7"
+							/>
+						</svg>
+						{t('contracts.backToContracts')}
+					</Button>
+				</Link>
+			</PageContainer>
+		);
+	}
+
+	return (
+		<PageContainer>
+			<PageHeader
+				title={t('contracts.editContract')}
+				description={`${t('contracts.editing')} ${contract.contract_number}`}
+				action={
+					<Link href={`/contracts/${id}`}>
+						<Button variant="outline" size="sm">
+							<svg
+								className="w-4 h-4 mr-2"
+								fill="none"
+								stroke="currentColor"
+								viewBox="0 0 24 24"
+							>
+								<path
+									strokeLinecap="round"
+									strokeLinejoin="round"
+									strokeWidth={2}
+									d="M15 19l-7-7 7-7"
+								/>
+							</svg>
+							{t('contracts.backToContract')}
+						</Button>
+					</Link>
+				}
+			/>
+			<div className="max-w-2xl">
+				<ContractForm initialData={contract} />
+			</div>
+		</PageContainer>
+	);
+}

src/app/contracts/[id]/page.js

@@ -113,6 +113,24 @@ export default function ContractDetailsPage() {
 								{t('contracts.backToContracts')}
 							</Button>
 						</Link>
+						<Link href={`/contracts/${contractId}/edit`}>
+							<Button variant="outline" size="sm">
+								<svg
+									className="w-4 h-4 mr-2"
+									fill="none"
+									stroke="currentColor"
+									viewBox="0 0 24 24"
+								>
+									<path
+										strokeLinecap="round"
+										strokeLinejoin="round"
+										strokeWidth={2}
+										d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"
+									/>
+								</svg>
+								{t('contracts.editContract')}
+							</Button>
+						</Link>
 						<Link href={`/projects/new?contract_id=${contractId}`}>
 							<Button variant="primary" size="sm">
 								<svg

src/components/ContractForm.js

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState } from "react";
+import { useState, useEffect } from "react";
 import { useRouter } from "next/navigation";
 import { Card, CardHeader, CardContent } from "@/components/ui/Card";
 import Button from "@/components/ui/Button";
@@ -8,8 +8,9 @@ import { Input } from "@/components/ui/Input";
 import { formatDateForInput } from "@/lib/utils";
 import { useTranslation } from "@/lib/i18n";
 
-export default function ContractForm() {
+export default function ContractForm({ initialData = null }) {
 	const { t } = useTranslation();
+	const isEdit = !!initialData;
 	const [form, setForm] = useState({
 		contract_number: "",
 		contract_name: "",
@@ -23,6 +24,21 @@ export default function ContractForm() {
 	const [loading, setLoading] = useState(false);
 	const router = useRouter();
 
+	// Update form when initialData changes (for edit mode)
+	useEffect(() => {
+		if (initialData) {
+			setForm({
+				contract_number: initialData.contract_number || "",
+				contract_name: initialData.contract_name || "",
+				customer_contract_number: initialData.customer_contract_number || "",
+				customer: initialData.customer || "",
+				investor: initialData.investor || "",
+				date_signed: initialData.date_signed || "",
+				finish_date: initialData.finish_date || "",
+			});
+		}
+	}, [initialData]);
+
 	function handleChange(e) {
 		setForm({ ...form, [e.target.name]: e.target.value });
 	}
@@ -34,21 +50,32 @@ export default function ContractForm() {
 		try {
 			console.log("Submitting form:", form);
 
-			const res = await fetch("/api/contracts", {
+			const url = isEdit 
-				method: "POST",
+				? `/api/contracts/${initialData.contract_id}` 
+				: "/api/contracts";
+			const method = isEdit ? "PUT" : "POST";
+
+			const res = await fetch(url, {
+				method,
 				headers: { "Content-Type": "application/json" },
 				body: JSON.stringify(form),
 			});
 
 			if (res.ok) {
 				const contract = await res.json();
-				router.push(`/contracts/${contract.contract_id}`);
+				router.push(`/contracts/${contract.contract_id || initialData.contract_id}`);
 			} else {
-				alert(t('contracts.failedToCreateContract'));
+				const errorMessage = isEdit 
+					? t('contracts.failedToUpdateContract') 
+					: t('contracts.failedToCreateContract');
+				alert(errorMessage);
 			}
 		} catch (error) {
-			console.error("Error creating contract:", error);
+			console.error(`Error ${isEdit ? 'updating' : 'creating'} contract:`, error);
-			alert(t('contracts.failedToCreateContract'));
+			const errorMessage = isEdit 
+				? t('contracts.failedToUpdateContract') 
+				: t('contracts.failedToCreateContract');
+			alert(errorMessage);
 		} finally {
 			setLoading(false);
 		}
@@ -189,7 +216,7 @@ export default function ContractForm() {
 											d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
 										></path>
 									</svg>
-									{t('common.creating')}
+									{isEdit ? t('common.updating') : t('common.creating')}
 								</>
 							) : (
 								<>
@@ -203,10 +230,10 @@ export default function ContractForm() {
 											strokeLinecap="round"
 											strokeLinejoin="round"
 											strokeWidth={2}
-											d="M12 4v16m8-8H4"
+											d={isEdit ? "M5 13l4 4L19 7" : "M12 4v16m8-8H4"}
 										/>
 									</svg>
-									{t('contracts.createContract')}
+									{isEdit ? t('contracts.updateContract') : t('contracts.createContract')}
 								</>
 							)}
 						</Button>

src/lib/i18n.js

@@ -287,6 +287,11 @@ const translations = {
       contract: "Umowa",
       newContract: "Nowa umowa",
       editContract: "Edytuj umowę",
+      editContractDescription: "Edycja szczegółów umowy",
+      editing: "Edycja umowy",
+      backToContract: "Powrót do umowy",
+      updateContract: "Zaktualizuj umowę",
+      failedToUpdateContract: "Nie udało się zaktualizować umowy. Sprawdź dane i spróbuj ponownie.",
       deleteContract: "Usuń umowę",
       contractNumber: "Numer umowy",
       contractName: "Nazwa umowy",
@@ -940,8 +945,14 @@ const translations = {
     contracts: {
       title: "Contracts",
       subtitle: "Manage your contracts and agreements",
+      contract: "Contract",
       newContract: "New Contract",
       editContract: "Edit Contract",
+      editContractDescription: "Edit contract details",
+      editing: "Editing contract",
+      backToContract: "Back to Contract",
+      updateContract: "Update Contract",
+      failedToUpdateContract: "Failed to update contract. Please check your data and try again.",
       deleteContract: "Delete Contract",
       contractNumber: "Contract Number",
       contractName: "Contract Name",
@@ -968,7 +979,40 @@ const translations = {
       signedOn: "Signed:",
       finishOn: "Finish:",
       customerLabel: "Customer:",
-      investorLabel: "Investor:"
+      investorLabel: "Investor:",
+      loadingContractDetails: "Loading contract details...",
+      contractNotFound: "Contract not found.",
+      backToContracts: "Back to Contracts",
+      addProject: "Add Project",
+      contractInformation: "Contract Information",
+      summary: "Summary",
+      projectsCount: "Projects Count",
+      projects: "projects",
+      contractStatus: "Contract Status",
+      contractDocuments: "Contract Documents",
+      uploadDocument: "Upload Document",
+      associatedProjects: "Associated Projects",
+      noProjectsYet: "No projects yet",
+      getStartedMessage: "Get started by creating the first project for this contract",
+      createFirstProject: "Create First Project",
+      viewDetails: "View Details",
+      createNewContract: "Create New Contract",
+      addNewContractDescription: "Add a new contract to your portfolio",
+      contractDetails: "Contract Details",
+      failedToCreateContract: "Failed to create contract. Please check your data and try again.",
+      uploadDocumentTitle: "Upload Document",
+      descriptionOptional: "Description (optional)",
+      descriptionPlaceholder: "Short description of the document...",
+      uploading: "Uploading...",
+      dropFilesHere: "Drop files here or click to browse",
+      supportedFiles: "PDF, DOC, XLS, Images up to 10MB",
+      chooseFile: "Choose File",
+      failedToUploadFile: "Failed to upload file",
+      loadingFiles: "Loading files...",
+      noDocumentsUploaded: "No documents uploaded",
+      download: "Download",
+      confirmDeleteFile: "Are you sure you want to delete this file?",
+      failedToDeleteFile: "Failed to delete file"
     },
 
     tasks: {