feat: Add document template management functionality

- Created migration script to add `docx_templates` table with necessary fields and indexes.
- Implemented API routes for uploading, fetching, and deleting document templates.
- Developed document generation feature using selected templates and project data.
- Added UI components for template upload and listing, including a modal for document generation.
- Integrated document generation into the project view page, allowing users to generate documents based on selected templates.
- Enhanced error handling and user feedback for template operations.

src/app/api/templates/route.js

@@ -0,0 +1,133 @@
+import { NextRequest, NextResponse } from "next/server";
+import { writeFile, mkdir, unlink } from "fs/promises";
+import { existsSync } from "fs";
+import path from "path";
+import db from "@/lib/db";
+
+const TEMPLATES_DIR = path.join(process.cwd(), "public", "templates");
+const MAX_FILE_SIZE = 10 * 1024 * 1024; // 10MB
+const ALLOWED_TYPES = [
+	"application/vnd.openxmlformats-officedocument.wordprocessingml.document"
+];
+
+export async function POST(request) {
+	try {
+		const formData = await request.formData();
+		const file = formData.get("file");
+		const templateName = formData.get("templateName");
+		const description = formData.get("description") || "";
+
+		if (!file || !templateName) {
+			return NextResponse.json(
+				{ error: "File and templateName are required" },
+				{ status: 400 }
+			);
+		}
+
+		// Validate file
+		if (file.size > MAX_FILE_SIZE) {
+			return NextResponse.json(
+				{ error: "File size too large (max 10MB)" },
+				{ status: 400 }
+			);
+		}
+
+		if (!ALLOWED_TYPES.includes(file.type)) {
+			return NextResponse.json(
+				{ error: "Only DOCX files are allowed" },
+				{ status: 400 }
+			);
+		}
+
+		// Create templates directory
+		if (!existsSync(TEMPLATES_DIR)) {
+			await mkdir(TEMPLATES_DIR, { recursive: true });
+		}
+
+		// Generate unique filename
+		const timestamp = Date.now();
+		const sanitizedOriginalName = file.name.replace(/[^a-zA-Z0-9.-]/g, "_");
+		const storedFilename = `${timestamp}_${sanitizedOriginalName}`;
+		const filePath = path.join(TEMPLATES_DIR, storedFilename);
+		const relativePath = `/templates/${storedFilename}`;
+
+		// Save file
+		const bytes = await file.arrayBuffer();
+		const buffer = Buffer.from(bytes);
+		await writeFile(filePath, buffer);
+
+		// Save to database
+		const stmt = db.prepare(`
+			INSERT INTO docx_templates (
+				template_name, description, original_filename, stored_filename,
+				file_path, file_size, mime_type, created_by
+			) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+		`);
+
+		const result = stmt.run(
+			templateName,
+			description,
+			file.name,
+			storedFilename,
+			relativePath,
+			file.size,
+			file.type,
+			null // TODO: Get from session when auth is implemented
+		);
+
+		const newTemplate = {
+			template_id: result.lastInsertRowid,
+			template_name: templateName,
+			description: description,
+			original_filename: file.name,
+			stored_filename: storedFilename,
+			file_path: relativePath,
+			file_size: file.size,
+			mime_type: file.type,
+			is_active: 1,
+			created_at: new Date().toISOString(),
+			updated_at: new Date().toISOString()
+		};
+
+		return NextResponse.json(newTemplate, { status: 201 });
+
+	} catch (error) {
+		console.error("Template upload error:", error);
+		return NextResponse.json(
+			{ error: "Failed to upload template" },
+			{ status: 500 }
+		);
+	}
+}
+
+export async function GET(request) {
+	try {
+		const templates = db.prepare(`
+			SELECT
+				template_id,
+				template_name,
+				description,
+				original_filename,
+				stored_filename,
+				file_path,
+				file_size,
+				mime_type,
+				is_active,
+				created_at,
+				created_by,
+				updated_at
+			FROM docx_templates
+			WHERE is_active = 1
+			ORDER BY created_at DESC
+		`).all();
+
+		return NextResponse.json(templates);
+
+	} catch (error) {
+		console.error("Error fetching templates:", error);
+		return NextResponse.json(
+			{ error: "Failed to fetch templates" },
+			{ status: 500 }
+		);
+	}
+}