const express = require('express');
const router = express.Router();
const sql = require('../sql');
const utils = require('../utils');
const audit_category = require('../audit_category');

router.get('/:noteId', async (req, res, next) => {
    let noteId = req.params.noteId;

    await sql.execute("update options set opt_value = ? where opt_name = 'start_node'", [noteId]);

    let detail = await sql.getSingleResult("select * from notes where note_id = ?", [noteId]);

    if (detail['note_clone_id']) {
        noteId = detail['note_clone_id'];
        detail = sql.getSingleResult("select * from notes where note_id = ?", [noteId]);
    }

    res.send({
        'detail': detail,
        'formatting': await sql.getResults("select * from formatting where note_id = ? order by note_offset", [noteId]),
        'links': await sql.getResults("select * from links where note_id = ? order by note_offset", [noteId]),
        'images': await sql.getResults("select * from images where note_id = ? order by note_offset", [noteId])
    });
});

router.put('/:noteId', async (req, res, next) => {
    let noteId = req.params.noteId;

    const detail = await sql.getSingleResult("select * from notes where note_id = ?", [noteId]);

    if (detail['note_clone_id']) {
        noteId = detail['note_clone_id'];
    }

    const note = req.body;

    const now = utils.nowTimestamp();

    const historySnapshotTimeInterval = parseInt(await sql.getOption('history_snapshot_time_interval'));

    const historyCutoff = now - historySnapshotTimeInterval;

    const history = await sql.getSingleResult("select id from notes_history where note_id = ? and date_modified >= ?", [noteId, historyCutoff]);

    await sql.beginTransaction();

    if (history) {
        await sql.execute("update notes_history set note_title = ?, note_text = ?, encryption = ? where id = ?", [
            note['detail']['note_title'],
            note['detail']['note_text'],
            note['detail']['encryption'],
            history['id']
        ]);
    }
    else {
        await sql.execute("insert into notes_history (note_id, note_title, note_text, encryption, date_modified) values (?, ?, ?, ?, ?)", [
            noteId,
            note['detail']['note_title'],
            note['detail']['note_text'],
            note['detail']['encryption'],
            now
        ]);
    }

    if (note['detail']['note_title'] !== detail['note_title']) {
        await sql.deleteRecentAudits(audit_category.UPDATE_TITLE, req, noteId);
        await sql.addAudit(audit_category.UPDATE_TITLE, req, noteId);
    }

    if (note['detail']['note_text'] !== detail['note_text']) {
        await sql.deleteRecentAudits(audit_category.UPDATE_CONTENT, req, noteId);
        await sql.addAudit(audit_category.UPDATE_CONTENT, req, noteId);
    }

    if (note['detail']['encryption'] !== detail['encryption']) {
        await sql.addAudit(audit_category.ENCRYPTION, req, noteId, detail['encryption'], note['detail']['encryption']);
    }

    await sql.execute("update notes set note_title = ?, note_text = ?, encryption = ?, date_modified = ? where note_id = ?", [
        note['detail']['note_title'],
        note['detail']['note_text'],
        note['detail']['encryption'],
        now,
        noteId]);

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

    for (const img of note['images']) {
        img['image_data'] = atob(img['image_data']);

        await sql.insert("images", img);
    }

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

    for (const link in note['links'])
        await sql.insert("links", link);

    await sql.commit();

    res.send({});
});

router.delete('/:noteId', async (req, res, next) => {
    await deleteNote(req.params.noteId);

    await sql.commit();

    res.send({});
});

async function deleteNote(noteId) {
    const children = await sql.getResults("select note_id from notes_tree where note_pid = ?", [noteId]);

    for (const child of children) {
        await deleteNote(child['note_id']);
    }

    await sql.delete("notes_tree", noteId);
    await sql.delete("notes", noteId);

    await sql.addAudit(audit_category.DELETE_NOTE, req, noteId);
}

router.post('/:parentNoteId/children', async (req, res, next) => {
    let parentNoteId = req.params.parentNoteId;

    const note = req.body;

    const noteId = utils.newNoteId();

    if (parentNoteId === "root") {
        parentNoteId = "";
    }

    let newNotePos = 0;

    if (note['target'] === 'into') {
        const res = await sql.getSingleResult('select max(note_pos) as max_note_pos from notes_tree where note_pid = ?', [parentNoteId]);
        const maxNotePos = res['max_note_pos'];

        if (maxNotePos === null) // no children yet
            newNotePos = 0;
        else
            newNotePos = maxNotePos + 1
    }
    else if (note['target'] === 'after') {
        const afterNote = await sql.getSingleResult('select note_pos from notes_tree where note_id = ?', [note['target_note_id']]);

        newNotePos = afterNote['note_pos'] + 1;

        await sql.execute('update notes_tree set note_pos = note_pos + 1 where note_pid = ? and note_pos > ?', [parentNoteId, afterNote['note_pos']]);
    }
    else {
        throw new ('Unknown target: ' + note['target']);
    }

    await sql.addAudit(audit_category.CREATE_NOTE, req, noteId);

    const now = utils.nowTimestamp();

    await sql.insert("notes", {
        'note_id': noteId,
        'note_title': note['note_title'],
        'note_text': '',
        'note_clone_id': '',
        'date_created': now,
        'date_modified': now,
        'icon_info': 'pencil',
        'is_finished': 0,
        'encryption': note['encryption']
    });

    await sql.insert("notes_tree", {
        'note_id': noteId,
        'note_pid': parentNoteId,
        'note_pos': newNotePos,
        'is_expanded': 0
    });

    await sql.commit();

    res.send({
        'note_id': noteId
    });
});

router.get('/', async (req, res, next) => {
    const search = '%' + req.query.search + '%';

    const result = await sql.getResults("select note_id from notes where note_title like ? or note_text like ?", [search, search]);

    const noteIdList = [];

    for (const res of result) {
        noteIdList.push(res['note_id']);
    }

    res.send(noteIdList);
});

module.exports = router;