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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { computed, reactive, watch } from 'vue';
import type { Reactive } from 'vue';
function copy<T>(v: T): T {
return JSON.parse(JSON.stringify(v));
}
function unwrapReactive<T>(v: Reactive<T>): T {
return JSON.parse(JSON.stringify(v));
}
export function useForm<T extends Record<string, any>>(initialState: T, save: (newState: T) => Promise<void>) {
const currentState = reactive<T>(copy(initialState));
const previousState = reactive<T>(copy(initialState));
const modifiedStates = reactive<Record<keyof T, boolean>>({} as any);
for (const key in currentState) {
modifiedStates[key] = false;
}
const modified = computed(() => Object.values(modifiedStates).some(v => v));
const modifiedCount = computed(() => Object.values(modifiedStates).filter(v => v).length);
watch([currentState, previousState], () => {
for (const key in modifiedStates) {
modifiedStates[key] = currentState[key] !== previousState[key];
}
}, { deep: true });
async function _save() {
await save(unwrapReactive(currentState));
for (const key in currentState) {
previousState[key] = copy(currentState[key]);
}
}
function discard() {
for (const key in currentState) {
currentState[key] = copy(previousState[key]);
}
}
return {
state: currentState,
savedState: previousState,
modifiedStates,
modified,
modifiedCount,
save: _save,
discard,
};
}
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