import { TRPCError } from "@trpc/server";
import type { Nullable } from "kysely";
import type {
	Appunti,
	AppuntiId,
	AppuntiUpdate,
	NewAppunti,
} from "~/schemas/public/Appunti";
import type {
	AppuntiGroups,
	AppuntiGroupsId,
	NewAppuntiGroups,
} from "~/schemas/public/AppuntiGroups";
import type { Users } from "~/schemas/public/Users";
import { db } from "../db";

export type AppuntiData = Omit<Appunti, "appunti_group_id"> & {
	column: string;
} & Nullable<Pick<Users, "username">>;

export const getAppunti = async (): Promise<AppuntiData[]> => {
	try {
		const appunti = await db
			.selectFrom("appunti")
			.select([
				"appunti.id",
				"appunti.name",
				"appunti.created_at",
				"appunti.descrizione",
				"appunti.userid",
				"appunti.appunti_group_id as column",
			])
			.innerJoin(
				"appunti_groups",
				"appunti.appunti_group_id",
				"appunti_groups.id",
			)
			.leftJoin("users", "appunti.userid", "users.id")
			.select("users.username")
			.orderBy("appunti_groups.name", "asc")
			.orderBy("appunti.created_at", "asc")
			.execute();

		return appunti.map((data) => ({
			...data,
			created_at: new Date(data.created_at),
		}));
	} catch (e) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Failed to fetch Appunti, error: ${(e as Error).message}`,
		});
	}
};

export const getAppuntiGroups = async (): Promise<AppuntiGroups[]> => {
	try {
		return await db.selectFrom("appunti_groups").selectAll().execute();
	} catch (e) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Failed to fetch Appunti groups, error: ${(e as Error).message}`,
		});
	}
};

export const addAppuntiGroup = async (data: NewAppuntiGroups) => {
	try {
		await db.insertInto("appunti_groups").values(data).execute();
		return { status: "success" };
	} catch (e) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Failed to add Appunti group, error: ${(e as Error).message}`,
		});
	}
};

export const deleteAppuntiGroup = async (id: AppuntiGroupsId) => {
	try {
		await db.deleteFrom("appunti_groups").where("id", "=", id).execute();
		return { status: "success" };
	} catch (e) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Failed to delete Appunti group, error: ${(e as Error).message}`,
		});
	}
};

export const addAppunti = async (data: NewAppunti) => {
	try {
		await db.insertInto("appunti").values(data).execute();
		return { status: "success" };
	} catch (e) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Failed to add Appunti, error: ${(e as Error).message}`,
		});
	}
};

export const deleteAppunti = async (id: AppuntiId) => {
	try {
		await db.deleteFrom("appunti").where("id", "=", id).execute();
		return { status: "success" };
	} catch (e) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Failed to delete Appunti, error: ${(e as Error).message}`,
		});
	}
};

export const updateAppunto = async (id: AppuntiId, data: AppuntiUpdate) => {
	try {
		await db.updateTable("appunti").set(data).where("id", "=", id).execute();
		return { status: "success" };
	} catch (e) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Failed to update Appunti, error: ${(e as Error).message}`,
		});
	}
};

export const updateAppunti = async (data: AppuntiData[]) => {
	try {
		const db_mappings = await db
			.selectFrom("appunti")
			.select(["id", "appunti_group_id"])
			.execute();

		const updates = data
			.map((item) => {
				const db_item = db_mappings.find((db_item) => db_item.id === item.id);
				if (db_item && db_item.appunti_group_id !== item.column) {
					const { column, username: _username, ...rest } = item;
					return {
						...rest,
						appunti_group_id: column as AppuntiGroupsId,
					};
				}
				return null;
			})
			.filter((item) => item !== null);

		for (const item of updates) {
			await db
				.updateTable("appunti")
				.set(item)
				.where("id", "=", item.id)
				.execute();
		}
		return { status: "success" };
	} catch (e) {
		throw new TRPCError({
			code: "INTERNAL_SERVER_ERROR",
			message: `Failed to update appunti, error: ${(e as Error).message}`,
		});
	}
};