/*
    ArozOS Office Suite - binary FileSaver backend
    Writes a base64-encoded payload the web client produced to a file on
    the server. Used by the Slides PDF export, which is built in the
    browser because only the browser knows how its text laid out.

    Required POST parameters:
        filepath  - virtual path to the target file (e.g. user:/Desktop/deck.pdf)
        content   - the file's bytes, base64 encoded
        contentFile - vpath of an uploaded temp file holding that base64,
                    used instead of content when the payload is too big for
                    a POST form body (deleted after reading)

    Response: JSON {"error": "..."} on failure, "OK" on success
*/

/*
    Same oversized-payload path as filesaver.agi: Go's r.ParseForm drops
    EVERY parameter once a urlencoded body passes 10MB, so the front end
    streams the payload to a temp file and passes its vpath instead.
*/
function resolveContent(){
    if (typeof contentFile !== "undefined" && contentFile){
        if (!requirelib("filelib")){
            return "";
        }
        var loaded = filelib.readFile(contentFile);
        filelib.deleteFile(contentFile);
        return loaded;
    }
    return (typeof content === "undefined" || !content) ? "" : content;
}

function main(){
    if (!requirelib("office")){
        sendJSONResp(JSON.stringify({ error: "office lib unavailable - please update your ArozOS host" }));
        return;
    }

    if (typeof filepath === "undefined" || !filepath || filepath.trim() === ""){
        sendJSONResp(JSON.stringify({ error: "filepath is required" }));
        return;
    }

    var payload = resolveContent();
    if (!payload){
        sendJSONResp(JSON.stringify({ error: "content is required" }));
        return;
    }

    try {
        if (!office.writeBinaryFile(payload, filepath)){
            sendJSONResp(JSON.stringify({ error: "unable to write file" }));
            return;
        }
        sendResp("OK");
    } catch (e) {
        sendJSONResp(JSON.stringify({ error: "write failed: " + e.message }));
    }
}

main();