// import { FreshContext } from '$fresh/server.ts'
import { TablesForModels } from '@lyrics/db.ts'
import { handleRpcRequest, ProcedureServerError } from 'saurpc'
import { rpcs } from '@lyrics/rpc.ts'

export type Method = 'GET' | 'PUT' | 'DELETE'

export function isMethod(value: string): value is Method {
	return (value in TablesForModels)
}

function toErrorResponse(e: ProcedureServerError) {
	const { type, message } = e
	const headers = { 'content-type': 'application/json' }
	switch (type) {
		case 'rpc_not_found':
			console.info('RPC Not Found:', e)
			return new Response(
				JSON.stringify({ type, message }),
				{ status: 404, headers },
			)
		case 'invalid_request':
			console.info('Invalid RPC:', e)
			return new Response(
				JSON.stringify({ type, message }),
				{ status: 400, headers },
			)
		case 'exception_caught':
			console.error('RPC Exception:', e)
			return new Response(
				JSON.stringify({ type }),
				{ status: 500, headers },
			)
	}
}

export const handler = async (
	req: Request,
	// _ctx: FreshContext,
): Promise<Response> => {
	try {
		return await handleRpcRequest(req, rpcs)
	} catch (e) {
		if (e instanceof ProcedureServerError) {
			return toErrorResponse(e)
		} else {
			console.error('Error handling RPC request:', e)
			return new Response('unknown error occurred', { status: 500 })
		}
	}
}