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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, type YamoriDB } from "./types";
import { service } from "./yamori/service";

import { v1 } from "./migrations/v0001";
import { v2 } from "./migrations/v0002";
import { v3 } from "./migrations/v0003";
import { v4 } from "./migrations/v0004";
import { v5 } from "./migrations/v0005";
import { v6 } from "./migrations/v0006";
import { v7 } from "./migrations/v0007";
import { v8 } from "./migrations/v0008";
import { v9 } from "./migrations/v0009";
import { v10 } from "./migrations/v0010";
import { v11 } from "./migrations/v0011";
import { v12 } from "./migrations/v0012";

import { automaticallyProvide } from "./yamori/worker/v1/paid_leave_provision";

class IDBBackend {
	[CONTEXT]: Context;

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

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

const migrations = [v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12] as const;

export async function idbBackend(): Promise<IDBBackend> {
	const db = await openDB<YamoriDB>("yamori", 12, {
		async upgrade(db, oldVersion, _newVersion, transaction, _event) {
			for (let i = 0, l = migrations.length; i < l; i++) {
				const version = i + 1;
				const migration = migrations[i];

				if (oldVersion < version && migration) {
					await migration(db, transaction);
				}
			}
		},
	});

	const tx = db.transaction(
		["workers", "paidLeaveProvision", "paidLeaveProvisionTable"],
		"readwrite",
	);

	const workers = tx.objectStore("workers");
	const paidLeaveProvisions = tx.objectStore("paidLeaveProvision");
	const paidLeaveProvisionTables = tx.objectStore("paidLeaveProvisionTable");

	for await (const worker of workers.iterate()) {
		await automaticallyProvide({
			worker: worker.value,
			workers,
			paidLeaveProvisions,
			paidLeaveProvisionTables,
		});
	}

	await tx.done;

	return new IDBBackend({
		db,
	});
}