"use strict";

const log = require('./log');
const rp = require('request-promise');
const sql = require('./sql');
const migration = require('./migration');

const SYNC_SERVER = 'http://localhost:3000';


let syncInProgress = false;

async function pullSync() {
    const lastSynced = parseInt(await sql.getOption('last_synced_pull'));

    const resp = await rp({
        uri: SYNC_SERVER + '/api/sync/changed/' + lastSynced,
        headers: {
            auth: 'sync'
        },
        json: true
    });

    try {
        await sql.beginTransaction();

        for (const treeItem of resp.tree) {
            delete treeItem['id'];

            await sql.insert("notes_tree", treeItem, true);

            log.info("Syncing notes_tree " + treeItem.note_id);
        }

        for (const audit of resp.audit_log) {
            delete audit['id'];

            await sql.insert("audit_log", audit, true);

            log.info("Syncing audit_log for noteId=" + audit.note_id);
        }

        for (const noteId of resp.notes) {
            const note = await rp({
                uri: SYNC_SERVER + "/api/sync/note/" + noteId + "/" + lastSynced,
                headers: {
                    auth: 'sync'
                },
                json: true
            });

            console.log(noteId);

            await sql.insert("notes", note.detail, true);

            await sql.remove("images", noteId);

            for (const image of note.images) {
                await sql.insert("images", image);
            }

            for (const history of note.history) {
                delete history['id'];

                await sql.insert("notes_history", history);
            }
        }

        await sql.setOption('last_synced_pull', syncTimestamp);

        await sql.commit();
    }
    catch (e) {
        await sql.rollback();

        throw e;
    }
}

async function pushSync() {

}

async function sync() {
    if (syncInProgress) {
        return;
    }

    syncInProgress = true;

    try {
        if (!await migration.isDbUpToDate()) {
            return;
        }

        await pushSync();

        await pullSync();
    }
    catch (e) {
        log.error("sync failed: " + e.stack);
    }
    finally {
        syncInProgress = false;
    }
}

setInterval(sync, 60000);

// kickoff initial sync immediately
setTimeout(sync, 1000);