export type LoggerBackend = {
	info(msg: string, ...args: unknown[]): void
	warn(msg: string, ...args: unknown[]): void
	error(msg: string, ...args: unknown[]): void
	debug?(msg: string, ...args: unknown[]): void
}

const NOOP_LOGGER: LoggerBackend = {
	info() {},
	warn() {},
	error() {},
	debug() {},
}

let _backend: LoggerBackend = NOOP_LOGGER
let _debug = false

export function initLogger(backend: LoggerBackend, debug: boolean): void {
	_backend = backend
	_debug = debug
}

export const log = {
	info(msg: string, ...args: unknown[]): void {
		_backend.info(`supermemory: ${msg}`, ...args)
	},

	warn(msg: string, ...args: unknown[]): void {
		_backend.warn(`supermemory: ${msg}`, ...args)
	},

	error(msg: string, err?: unknown): void {
		const detail = err instanceof Error ? err.message : err ? String(err) : ""
		_backend.error(`supermemory: ${msg}${detail ? ` — ${detail}` : ""}`)
	},

	debug(msg: string, ...args: unknown[]): void {
		if (!_debug) return
		const fn = _backend.debug ?? _backend.info
		fn(`supermemory [debug]: ${msg}`, ...args)
	},

	debugRequest(method: string, params: Record<string, unknown>): void {
		if (!_debug) return
		const fn = _backend.debug ?? _backend.info
		fn(`supermemory [debug] → ${method}`, JSON.stringify(params, null, 2))
	},

	debugResponse(method: string, data: unknown): void {
		if (!_debug) return
		const fn = _backend.debug ?? _backend.info
		fn(`supermemory [debug] ← ${method}`, JSON.stringify(data, null, 2))
	},
}