export class ApiError extends Error {
    status;
    constructor(status, message) {
        super(message);
        this.status = status;
    }
}
function target(path, opts) {
    const pathParams = (opts.path ?? {});
    let url = path.replace(/\{(\w+)\}/g, (_, key) => {
        const value = pathParams[key];
        if (value === undefined) {
            throw new Error(`missing path parameter ${key} for ${path}`);
        }
        return encodeURIComponent(String(value));
    });
    const query = new URLSearchParams();
    for (const [key, value] of Object.entries((opts.query ?? {}))) {
        if (value !== undefined) {
            query.set(key, String(value));
        }
    }
    if (query.size > 0) {
        url += `?${query}`;
    }
    return url;
}
export async function request(method, path, opts = {}) {
    const url = target(path, opts);
    const init = { method: method.toUpperCase(), keepalive: opts.keepalive ?? false };
    if (opts.body instanceof Blob) {
        init.headers = { "Content-Type": opts.body.type || "application/octet-stream" };
        init.body = opts.body;
    }
    else if (opts.body !== undefined) {
        init.headers = { "Content-Type": "application/json" };
        init.body = JSON.stringify(opts.body);
    }
    const res = await fetch(url, init);
    if (res.status === 204) {
        return undefined;
    }
    if (!res.headers.get("Content-Type")?.startsWith("application/json")) {
        const text = (await res.text()).trim();
        throw new ApiError(res.status, `${res.status} ${res.statusText}${text ? `: ${text}` : ""}`);
    }
    const data = await res.json();
    if (!res.ok) {
        throw new ApiError(res.status, data.message);
    }
    return data;
}
export const get = (path, opts) => request("get", path, opts);
export const post = (path, opts) => request("post", path, opts);
export const put = (path, opts) => request("put", path, opts);
export const del = (path, opts) => request("delete", path, opts);
export function socket(path, opts) {
    const ws = new WebSocket(`${location.protocol === "https:" ? "wss:" : "ws:"}//${location.host}${target(path, opts)}`);
    ws.binaryType = "arraybuffer";
    return ws;
}
const staleAfterMs = 40_000;
const retryAfterMs = 2_000;
export function subscribe(after, filter, onEvent, onState) {
    let last = after;
    let heard = Date.now();
    let source;
    let retry = 0;
    const connect = () => {
        clearTimeout(retry);
        source?.close();
        heard = Date.now();
        const query = new URLSearchParams({ after: String(last) });
        if (filter.task_id) {
            query.set("task_id", filter.task_id);
        }
        if (filter.lead) {
            query.set("lead", "true");
        }
        const s = new EventSource(`/api/events?${query}`);
        source = s;
        s.onopen = () => {
            heard = Date.now();
            onState(true);
        };
        s.onerror = () => {
            onState(false);
            if (s.readyState === EventSource.CLOSED) {
                retry = setTimeout(connect, retryAfterMs);
            }
        };
        s.addEventListener("ping", () => {
            heard = Date.now();
        });
        s.onmessage = (msg) => {
            heard = Date.now();
            const ev = JSON.parse(msg.data);
            if (ev.seq > last) {
                last = ev.seq;
            }
            onEvent(ev);
        };
    };
    const check = () => {
        if (Date.now() - heard < staleAfterMs) {
            return;
        }
        onState(false);
        connect();
    };
    const onVisible = () => {
        if (document.visibilityState === "visible") {
            check();
        }
    };
    const interval = setInterval(check, 5_000);
    addEventListener("online", connect);
    document.addEventListener("visibilitychange", onVisible);
    connect();
    return () => {
        clearInterval(interval);
        clearTimeout(retry);
        removeEventListener("online", connect);
        document.removeEventListener("visibilitychange", onVisible);
        source?.close();
    };
}
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