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diff --git a/opendc-web/opendc-web-server/src/main/webui/data/project.js b/opendc-web/opendc-web-server/src/main/webui/data/project.js
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+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import { useQuery, useMutation } from 'react-query'
+import { addProject, deleteProject, fetchProject, fetchProjects } from '../api/projects'
+import { addPortfolio, deletePortfolio, fetchPortfolio, fetchPortfolios } from '../api/portfolios'
+import { addScenario, deleteScenario, fetchScenario } from '../api/scenarios'
+
+/**
+ * Configure the query defaults for the project endpoints.
+ */
+export function configureProjectClient(queryClient, auth) {
+    queryClient.setQueryDefaults('projects', {
+        queryFn: ({ queryKey }) => (queryKey.length === 1 ? fetchProjects(auth) : fetchProject(auth, queryKey[1])),
+    })
+
+    queryClient.setMutationDefaults('addProject', {
+        mutationFn: (data) => addProject(auth, data),
+        onSuccess: async (result) => {
+            queryClient.setQueryData('projects', (old = []) => [...old, result])
+            queryClient.setQueryData(['projects', result.id], result)
+        },
+    })
+    queryClient.setMutationDefaults('deleteProject', {
+        mutationFn: (id) => deleteProject(auth, id),
+        onSuccess: async (result) => {
+            queryClient.setQueryData('projects', (old = []) => old.filter((project) => project.id !== result.id))
+            queryClient.removeQueries(['projects', result.id])
+        },
+    })
+
+    queryClient.setQueryDefaults('portfolios', {
+        queryFn: ({ queryKey }) =>
+            queryKey.length === 2 ? fetchPortfolios(auth, queryKey[1]) : fetchPortfolio(auth, queryKey[1], queryKey[2]),
+    })
+    queryClient.setMutationDefaults('addPortfolio', {
+        mutationFn: ({ projectId, ...data }) => addPortfolio(auth, projectId, data),
+        onSuccess: async (result) => {
+            queryClient.setQueryData(['portfolios', result.project.id], (old = []) => [...old, result])
+            queryClient.setQueryData(['portfolios', result.project.id, result.number], result)
+        },
+    })
+    queryClient.setMutationDefaults('deletePortfolio', {
+        mutationFn: ({ projectId, number }) => deletePortfolio(auth, projectId, number),
+        onSuccess: async (result) => {
+            queryClient.setQueryData(['portfolios', result.project.id], (old = []) =>
+                old.filter((portfolio) => portfolio.id !== result.id)
+            )
+            queryClient.removeQueries(['portfolios', result.project.id, result.number])
+        },
+    })
+
+    queryClient.setQueryDefaults('scenarios', {
+        queryFn: ({ queryKey }) => fetchScenario(auth, queryKey[1], queryKey[2]),
+    })
+    queryClient.setMutationDefaults('addScenario', {
+        mutationFn: ({ projectId, portfolioNumber, data }) => addScenario(auth, projectId, portfolioNumber, data),
+        onSuccess: async (result) => {
+            // Register updated scenario in cache
+            queryClient.setQueryData(['scenarios', result.project.id, result.id], result)
+            queryClient.setQueryData(['portfolios', result.project.id, result.portfolio.number], (old) => ({
+                ...old,
+                scenarios: [...old.scenarios, result],
+            }))
+        },
+    })
+    queryClient.setMutationDefaults('deleteScenario', {
+        mutationFn: ({ projectId, number }) => deleteScenario(auth, projectId, number),
+        onSuccess: async (result) => {
+            queryClient.removeQueries(['scenarios', result.project.id, result.id])
+            queryClient.setQueryData(['portfolios', result.project.id, result.portfolio.number], (old) => ({
+                ...old,
+                scenarios: old?.scenarios?.filter((scenario) => scenario.id !== result.id),
+            }))
+        },
+    })
+}
+
+/**
+ * Return the available projects.
+ */
+export function useProjects(options = {}) {
+    return useQuery('projects', options)
+}
+
+/**
+ * Return the project with the specified identifier.
+ */
+export function useProject(projectId, options = {}) {
+    return useQuery(['projects', projectId], { enabled: !!projectId, ...options })
+}
+
+/**
+ * Create a mutation for a new project.
+ */
+export function useNewProject() {
+    return useMutation('addProject')
+}
+
+/**
+ * Create a mutation for deleting a project.
+ */
+export function useDeleteProject() {
+    return useMutation('deleteProject')
+}
+
+/**
+ * Return the portfolio with the specified identifier.
+ */
+export function usePortfolio(projectId, portfolioId, options = {}) {
+    return useQuery(['portfolios', projectId, portfolioId], { enabled: !!(projectId && portfolioId), ...options })
+}
+
+/**
+ * Return the portfolios of the specified project.
+ */
+export function usePortfolios(projectId, options = {}) {
+    return useQuery(['portfolios', projectId], { enabled: !!projectId, ...options })
+}
+
+/**
+ * Create a mutation for a new portfolio.
+ */
+export function useNewPortfolio() {
+    return useMutation('addPortfolio')
+}
+
+/**
+ * Create a mutation for deleting a portfolio.
+ */
+export function useDeletePortfolio() {
+    return useMutation('deletePortfolio')
+}
+
+/**
+ * Create a mutation for a new scenario.
+ */
+export function useNewScenario() {
+    return useMutation('addScenario')
+}
+
+/**
+ * Create a mutation for deleting a scenario.
+ */
+export function useDeleteScenario() {
+    return useMutation('deleteScenario')
+}