import.js

// NOTE: Firefox doesn't add async/await support until version 52.  Stable is version 50 currently as of this writing.
// step 1: open the BPM extension's 'options' page
// step 2: open chrome devtools console. On Windows and Linux: Ctrl + Shift + J. On Mac: Cmd + Option + J.
// step 3: copy-paste the below code.  Make sure to hit enter after pasting so that it runs
// step 4: close and re-open the BPM options page, scroll down to the bottom to see the list of custom CSS subreddits to confirm it now includes the berrymotes ones

// NOTE: because of a message handler that runs inside BPM that's expecting this to run inside the context of a 
// particular message, there will be an error shown in the console after this runs, but ***IT CAN BE SAFELY IGNORED***.
// It will look something like this:
// 
// Error in event handler for (unknown): TypeError: Cannot read property 'method' of undefined
//     at Object._message_handler (chrome-extension://bkkmhlceghomaajdimmejkhldnpleoea/options.js:137:27)

(async() => {
    const response = await fetch('http://berrymotes.com/assets/berrymotes_json_data.json');
    const jsondata = await response.json();
    const subs = jsondata.map(entry => entry.sr);
    const uniqueSubs = new Set(subs); 
    console.log(`discovered ${uniqueSubs.size} subreddits from ${jsondata.length} emotes`);
    
    // remove any subs that are already present in the list
    const subsToAdd = new Set(uniqueSubs);
    for (const existingSub in bpm_prefs.prefs.customCSSSubreddits) {
        subsToAdd.delete(existingSub);
    }
    
    if (subsToAdd.size == 0) {
        console.log(`all ${uniqueSubs.size} subreddits are already present in custom css subreddit list`);
        return;
    }
    
    console.log(`adding ${subsToAdd.size} subreddits not already present in custom css subreddit list`);
    for (const subToAdd of subsToAdd) {
        console.log(`adding missing sub '${subToAdd}'`);
        bpm_prefs.prefs.customCSSSubreddits[subToAdd] = 0;
    }
    console.log(`all ${subsToAdd.size} missing subs have been added, calling sync_key`);
    console.warn(`NOTE: IGNORE THE ERROR TypeError: Cannot read property 'method' of undefined`);
    bpm_prefs.sync_key("customCSSSubreddits");
})();