feat: Begins po detail.

Sources/App/Controllers/View/PurchaseOrderViewController.swift

@@ -12,24 +12,36 @@ struct PurchaseOrderViewController: RouteCollection {
 
     pos.get(use: index(req:))
     pos.post(use: create(req:))
+    pos.group(":id") {
+      $0.get(use: detail(req:))
+    }
   }
 
-  // TODO: Use pageinated version.
   @Sendable
   func index(req: Request) async throws -> View {
-    let purchaseOrders = try await api2.fetchAll(on: req.db)
+    let params = try? req.query.decode(PurchaseOrderIndex.self)
+    let purchaseOrdersPage = try await api2.fetchPage(params?.page ?? 1, limit: params?.limit ?? 50, on: req.db)
     let branches = try await self.branches.getBranches(req: req)
     let employees = try await employeesApi.index(req: req)
     req.logger.debug("Branches: \(branches)")
     return try await req.view.render(
       "purchaseOrders/index",
       PurchaseOrderCTX(
-        purchaseOrders: purchaseOrders,
+        page: purchaseOrdersPage,
         form: .create(branches: branches, employees: employees)
       )
     )
   }
 
+  @Sendable
+  func detail(req: Request) async throws -> View {
+    guard let id = req.parameters.get("id", as: PurchaseOrder.IDValue.self) else {
+      throw Abort(.badRequest, reason: "Id not supplied.")
+    }
+    let purchaseOrder = try await api2.get(id: id, on: req.db)
+    return try await req.view.render("purchaseOrders/detail", ["purchaseOrder": purchaseOrder])
+  }
+
   @Sendable
   func create(req: Request) async throws -> View {
     try PurchaseOrder.FormCreate.validate(content: req)
@@ -40,9 +52,33 @@ struct PurchaseOrderViewController: RouteCollection {
   }
 }
 
+private struct PurchaseOrderIndex: Content {
+  let page: Int?
+  let limit: Int?
+}
+
 private struct PurchaseOrderCTX: Content {
   let purchaseOrders: [PurchaseOrder.DTO]
+  let page: Int
+  let limit: Int
+  let hasNext: Bool
+  let hasPrevious: Bool
   let form: PurchaseOrderFormCTX?
+
+  init(page: Page<PurchaseOrder.DTO>, form: PurchaseOrderFormCTX?) {
+    self.purchaseOrders = page.items
+    self.page = page.metadata.page
+    self.limit = page.metadata.per
+    self.hasNext = page.metadata.hasNext
+    self.hasPrevious = page.metadata.page > 1
+    self.form = form
+  }
+}
+
+private extension PageMetadata {
+  var hasNext: Bool {
+    total > (page * per)
+  }
 }
 
 private struct PurchaseOrderFormCTX: Content {