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// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

import { openDB } from "idb";

import { CONTEXT } from "./symbols";
import { type Context, type RPCMessage } from "./types";
import { service } from "./yamori/service";

class IDBBackend {
	[CONTEXT]: Context;

	constructor(ctx: Context) {
		this[CONTEXT] = ctx;
	}

	handle(request: RPCMessage): Promise<Uint8Array> {
		return service(request, this[CONTEXT]);
	}
}

export async function idbBackend(): Promise<IDBBackend> {
	return new IDBBackend({
		db: await openDB("yamori", 5, {
			async upgrade(db, oldVersion, _newVersion, transaction, _event) {
				// v1
				if (oldVersion < 1) {
					const workspaces = db.createObjectStore("workspaces", {
						keyPath: "id",
					});

					workspaces.createIndex("updatedAt", "updatedAt", {
						unique: false,
					});
				}

				// v2
				if (oldVersion < 2) {
					const store = transaction.objectStore("workspaces");

					for await (const cursor of store.iterate()) {
						const deletionKey = new Uint8Array(16);
						self.crypto.getRandomValues(deletionKey);

						const updateKey = new Uint8Array(16);
						self.crypto.getRandomValues(updateKey);

						const workerAddKey = new Uint8Array(16);
						self.crypto.getRandomValues(workerAddKey);

						await cursor.update({
							...cursor.value,
							capabilities: {
								...cursor.value.capabilities,
								deletionKey,
								updateKey,
								workerAddKey,
							},
						});
					}
				}

				// v3
				if (oldVersion < 3) {
					const workers = db.createObjectStore("workers", {
						keyPath: "id",
					});

					workers.createIndex("workspaceId", "workspaceId", {
						unique: false,
					});

					workers.createIndex("updatedAt", "updatedAt", {
						unique: false,
					});
				}

				// v4
				if (oldVersion < 4) {
					const store = transaction.objectStore("workspaces");

					for await (const cursor of store.iterate()) {
						const createLeaveDefinitionKey = new Uint8Array(16);
						self.crypto.getRandomValues(createLeaveDefinitionKey);

						await cursor.update({
							...cursor.value,
							capabilities: {
								...cursor.value.capabilities,
								createLeaveDefinitionKey,
							},
						});
					}
				}

				// v5
				if (oldVersion < 5) {
					const store = transaction.objectStore("workspaces");

					for await (const cursor of store.iterate()) {
						await cursor.update({
							...cursor.value,
							// 労働基準法 第三十九条 第十項 で定義されている「出勤したものとみなす」休業に
							// ついてはどんな会社でも必ず必須となるため一律で登録する。
							leaveDefinitions: [
								{
									id: `lv-${self.crypto.randomUUID()}`,
									displayName: "育児休業",
									isWorkerDeemedToBeWorked: true,
									updateKey: null,
									createdBy: "system",
								},
								{
									id: `lv-${self.crypto.randomUUID()}`,
									displayName: "介護休業",
									isWorkerDeemedToBeWorked: true,
									updateKey: null,
									createdBy: "system",
								},
								{
									id: `lv-${self.crypto.randomUUID()}`,
									displayName: "産前産後休業",
									isWorkerDeemedToBeWorked: true,
									updateKey: null,
									createdBy: "system",
								},
							],
						});
					}
				}
			},
		}),
	});
}