import log = require('./log');
import noteService = require('./notes');
import sql = require('./sql');
import utils = require('./utils');
import attributeService = require('./attributes');
import dateNoteService = require('./date_notes');
import treeService = require('./tree');
import config = require('./config');
import axios = require('axios');
import dayjs = require('dayjs');
import xml2js = require('xml2js');
import cloningService = require('./cloning');
import appInfo = require('./app_info');
import searchService = require('./search/services/search');
import SearchContext = require('./search/search_context');
import becca = require('../becca/becca');
import ws = require('./ws');
import SpacedUpdate = require('./spaced_update');
import specialNotesService = require('./special_notes');
import branchService = require('./branches');
import exportService = require('./export/zip');
import syncMutex = require('./sync_mutex');
import backupService = require('./backup');
import optionsService = require('./options');
import BNote = require('../becca/entities/bnote');
import AbstractBeccaEntity = require('../becca/entities/abstract_becca_entity');
import BBranch = require('../becca/entities/bbranch');
import BAttribute = require('../becca/entities/battribute');
import BAttachment = require('../becca/entities/battachment');
import BRevision = require('../becca/entities/brevision');
import BEtapiToken = require('../becca/entities/betapi_token');
import BOption = require('../becca/entities/boption');
import { AttributeRow, AttributeType, NoteType } from '../becca/entities/rows';
import Becca from '../becca/becca-interface';
import { NoteParams } from './note-interface';
import { ApiParams } from './backend_script_api_interface';


/**
 * A whole number
 * @typedef {number} int
 */

/**
 * An instance of the frontend api available globally.
 * @global
 * @var {BackendScriptApi} api
 */

interface SearchParams {
    includeArchivedNotes?: boolean;
    ignoreHoistedNote?: boolean;
}

interface NoteAndBranch {
    note: BNote;
    /** object having "note" and "branch" keys representing respective objects */
    branch: BBranch;
}

interface Api {
    /**
     * Note where the script started executing (entrypoint).
     * As an analogy, in C this would be the file which contains the main() function of the current process.
     */
    startNote: BNote;

    /**
     * Note where the script is currently executing. This comes into play when your script is spread in multiple code
     * notes, the script starts in "startNote", but then through function calls may jump into another note (currentNote).
     * A similar concept in C would be __FILE__
     * Don't mix this up with the concept of active note.
     */
    currentNote: BNote;

    /**
     * Entity whose event triggered this execution
     */
    originEntity: AbstractBeccaEntity<any>;
    
    /**
     * Axios library for HTTP requests. See {@link https://axios-http.com} for documentation
     * @type {axios}
     * @deprecated use native (browser compatible) fetch() instead
     */
    axios: typeof axios;

    /**
     * day.js library for date manipulation. See {@link https://day.js.org} for documentation
     */
    dayjs: typeof dayjs;

    /**
     * xml2js library for XML parsing. See {@link https://github.com/Leonidas-from-XIV/node-xml2js} for documentation
     */

    xml2js: typeof xml2js;
    
    /**
     * Instance name identifies particular Trilium instance. It can be useful for scripts
     * if some action needs to happen on only one specific instance.
     */
    getInstanceName(): string | null;
    
    getNote(noteId: string): BNote | null;
    getBranch(branchId: string): BBranch | null;
    getAttribute(attachmentId: string): BAttribute | null;
    getAttachment(attachmentId: string): BAttachment | null;
    getRevision(revisionId: string): BRevision | null;
    getEtapiToken(etapiTokenId: string): BEtapiToken | null;
    getEtapiTokens(): BEtapiToken[];
    getOption(optionName: string): BOption | null;
    getOptions(): BOption[];
    getAttribute(attributeId: string): BAttribute | null;
    
    /**
     * This is a powerful search method - you can search by attributes and their values, e.g.:
     * "#dateModified =* MONTH AND #log". See {@link https://github.com/zadam/trilium/wiki/Search} for full documentation for all options
     */
    searchForNotes(query: string, searchParams: SearchParams): BNote[];
    
    /**
     * This is a powerful search method - you can search by attributes and their values, e.g.:
     * "#dateModified =* MONTH AND #log". See {@link https://github.com/zadam/trilium/wiki/Search} for full documentation for all options
     *
     * @param {string} query
     * @param {Object} [searchParams]
     */
    searchForNote(query: string, searchParams: SearchParams): BNote | null;
    
    /**
     * Retrieves notes with given label name & value
     *
     * @param  name - attribute name
     * @param  value - attribute value
     */
    getNotesWithLabel(name: string, value?: string): BNote[];

    /**
     * Retrieves first note with given label name & value
     *
     * @param name - attribute name
     * @param value - attribute value
     */
    getNoteWithLabel(name: string, value?: string): BNote | null;

    /**
     * If there's no branch between note and parent note, create one. Otherwise, do nothing. Returns the new or existing branch.
     *
     * @param prefix - if branch is created between note and parent note, set this prefix
     */
    ensureNoteIsPresentInParent(noteId: string, parentNoteId: string, prefix: string): {
        branch: BBranch | null
    };

    /**
     * If there's a branch between note and parent note, remove it. Otherwise, do nothing.
     */
    ensureNoteIsAbsentFromParent(noteId: string, parentNoteId: string): void;

    /**
     * Based on the value, either create or remove branch between note and parent note.
     *
     * @param present - true if we want the branch to exist, false if we want it gone
     * @param prefix - if branch is created between note and parent note, set this prefix
     */
    toggleNoteInParent(present: true, noteId: string, parentNoteId: string, prefix: string): void;

    /**
     * Create text note. See also createNewNote() for more options.
     */
    createTextNote(parentNoteId: string, title: string, content: string): NoteAndBranch;

    /**
     * Create data note - data in this context means object serializable to JSON. Created note will be of type 'code' and
     * JSON MIME type. See also createNewNote() for more options.
     */
    createDataNote(parentNoteId: string, title: string, content: {}): NoteAndBranch;

    /**
     * @returns object contains newly created entities note and branch
     */
    createNewNote(params: NoteParams): NoteAndBranch;

    /**
     * @deprecated please use createTextNote() with similar API for simpler use cases or createNewNote() for more complex needs
     * @param parentNoteId - create new note under this parent
     * @returns object contains newly created entities note and branch
     */
    createNote(parentNoteId: string, title: string, content: string, extraOptions: Omit<NoteParams, "title" | "content" | "type" | "parentNoteId"> & {
        /** should the note be JSON */
        json?: boolean;
        attributes?: AttributeRow[]
    }): NoteAndBranch;

    logMessages: Record<string, string[]>;
    logSpacedUpdates: Record<string, SpacedUpdate>;

    /**
     * Log given message to trilium logs and log pane in UI
     */
    log(message: string): void;

    /**
     * Returns root note of the calendar.
     */
    getRootCalendarNote(): BNote | null;

    /**
     * Returns day note for given date. If such note doesn't exist, it is created.
     *
     * @method
     * @param date in YYYY-MM-DD format
     * @param rootNote - specify calendar root note, normally leave empty to use the default calendar
     */
    getDayNote(date: string, rootNote?: BNote): BNote | null;

    /**
     * Returns today's day note. If such note doesn't exist, it is created.
     * 
     * @param rootNote specify calendar root note, normally leave empty to use the default calendar
     */
    getTodayNote(rootNote?: BNote): BNote | null;

    /**
     * Returns note for the first date of the week of the given date.
     *
     * @param date in YYYY-MM-DD format
     * @param rootNote - specify calendar root note, normally leave empty to use the default calendar
     */
    getWeekNote(date: string, options: {
        // TODO: Deduplicate type with date_notes.ts once ES modules are added.
        /** either "monday" (default) or "sunday" */
        startOfTheWeek: "monday" | "sunday";
    }, rootNote: BNote): BNote | null;

    /**
     * Returns month note for given date. If such a note doesn't exist, it is created.
     *
     * @param date in YYYY-MM format
     * @param rootNote - specify calendar root note, normally leave empty to use the default calendar
     */
    getMonthNote(date: string, rootNote: BNote): BNote | null;

    /**
     * Returns year note for given year. If such a note doesn't exist, it is created.
     *
     * @param year in YYYY format
     * @param rootNote - specify calendar root note, normally leave empty to use the default calendar
     */
    getYearNote(year: string, rootNote?: BNote): BNote | null;

    /**
     * Sort child notes of a given note.
     */
    sortNotes(parentNoteId: string, sortConfig: {
        /** 'title', 'dateCreated', 'dateModified' or a label name
          * See {@link https://github.com/zadam/trilium/wiki/Sorting} for details. */
        sortBy?: string;
        reverse?: boolean;
        foldersFirst?: boolean;
    }): void;

    /**
     * This method finds note by its noteId and prefix and either sets it to the given parentNoteId
     * or removes the branch (if parentNoteId is not given).
     *
     * This method looks similar to toggleNoteInParent() but differs because we're looking up branch by prefix.
     *
     * @deprecated this method is pretty confusing and serves specialized purpose only
     */
    setNoteToParent(noteId: string, prefix: string, parentNoteId: string | null): void;

    /**
     * This functions wraps code which is supposed to be running in transaction. If transaction already
     * exists, then we'll use that transaction.
     *
     * @param func
     * @returns result of func callback
     */
    transactional(func: () => void): any;

    /**
     * Return randomly generated string of given length. This random string generation is NOT cryptographically secure.
     *
     * @param length of the string
     * @returns random string
     */
    randomString(length: number): string;

    /**
     * @param to escape
     * @returns escaped string
     */
    escapeHtml(string: string): string;

    /**
     * @param string to unescape
     * @returns unescaped string
     */
    unescapeHtml(string: string): string;

    /**
     * sql
     * @type {module:sql}
     */
    sql: any;

    getAppInfo(): typeof appInfo;

    /**
     * Creates a new launcher to the launchbar. If the launcher (id) already exists, it will be updated.
     */
    createOrUpdateLauncher(opts: {
        /** id of the launcher, only alphanumeric at least 6 characters long */
        id: string;
        /** one of
         * - "note" - activating the launcher will navigate to the target note (specified in targetNoteId param)
         * - "script" -  activating the launcher will execute the script (specified in scriptNoteId param)
         * - "customWidget" - the launcher will be rendered with a custom widget (specified in widgetNoteId param)
         */
        type: "note" | "script" | "customWidget";
        title: string;
        /** if true, will be created in the "Visible launchers", otherwise in "Available launchers" */
        isVisible: boolean;
        /** name of the boxicon to be used (e.g. "bx-time") */
        icon: string;
        /** will activate the target note/script upon pressing, e.g. "ctrl+e" */
        keyboardShortcut: string;
        /** for type "note" */
        targetNoteId: string;
        /** for type "script" */
        scriptNoteId: string;
        /** for type "customWidget" */
        widgetNoteId?: string;
    }): { note: BNote };

    /**
     * @param format - either 'html' or 'markdown'
     */
    exportSubtreeToZipFile(noteId: string, format: "markdown" | "html", zipFilePath: string): Promise<void>;

    /**
     * Executes given anonymous function on the frontend(s).
     * Internally, this serializes the anonymous function into string and sends it to frontend(s) via WebSocket.
     * Note that there can be multiple connected frontend instances (e.g. in different tabs). In such case, all
     * instances execute the given function.
     *
     * @param script - script to be executed on the frontend
     * @param params - list of parameters to the anonymous function to be sent to frontend
     * @returns no return value is provided.
     */
    runOnFrontend(script: () => void | string, params: []): void;

    /**
     * Sync process can make data intermittently inconsistent. Scripts which require strong data consistency
     * can use this function to wait for a possible sync process to finish and prevent new sync process from starting
     * while it is running.
     *
     * Because this is an async process, the inner callback doesn't have automatic transaction handling, so in case
     * you need to make some DB changes, you need to surround your call with api.transactional(...)
     *
     * @param callback - function to be executed while sync process is not running
     * @returns resolves once the callback is finished (callback is awaited)
     */
    runOutsideOfSync(callback: () => void): Promise<void>;

    /**
     * @param backupName - If the backupName is e.g. "now", then the backup will be written to "backup-now.db" file
     * @returns resolves once the backup is finished
     */
    backupNow(backupName: string): Promise<string>;

     /**
     * This object contains "at your risk" and "no BC guarantees" objects for advanced use cases.
     */
    __private: {
        /** provides access to the backend in-memory object graph, see {@link https://github.com/zadam/trilium/blob/master/src/becca/becca.js} */
        becca: Becca;
    };
}

// TODO: Convert to class.
/**
 * <p>This is the main backend API interface for scripts. All the properties and methods are published in the "api" object
 * available in the JS backend notes. You can use e.g. <code>api.log(api.startNote.title);</code></p>
 *
 * @constructor
 */
function BackendScriptApi(this: Api, currentNote: BNote, apiParams: ApiParams) {
    this.startNote = apiParams.startNote;
    
    this.currentNote = currentNote;
    
    this.originEntity = apiParams.originEntity;

    for (const key in apiParams) {
        (this as any)[key] = apiParams[key as keyof ApiParams];
    }

    this.axios = axios;
    this.dayjs = dayjs;
    this.xml2js = xml2js;
    this.getInstanceName = () => config.General ? config.General.instanceName : null;
    this.getNote = noteId => becca.getNote(noteId);
    this.getBranch = branchId => becca.getBranch(branchId);
    this.getAttribute = attributeId => becca.getAttribute(attributeId);
    this.getAttachment = attachmentId => becca.getAttachment(attachmentId);
    this.getRevision = revisionId => becca.getRevision(revisionId);
    this.getEtapiToken = etapiTokenId => becca.getEtapiToken(etapiTokenId);
    this.getEtapiTokens = () => becca.getEtapiTokens();
    this.getOption = optionName => becca.getOption(optionName);
    this.getOptions = () => optionsService.getOptions();
    this.getAttribute = attributeId => becca.getAttribute(attributeId);
    
    this.searchForNotes = (query, searchParams = {}) => {
        if (searchParams.includeArchivedNotes === undefined) {
            searchParams.includeArchivedNotes = true;
        }

        if (searchParams.ignoreHoistedNote === undefined) {
            searchParams.ignoreHoistedNote = true;
        }

        const noteIds = searchService.findResultsWithQuery(query, new SearchContext(searchParams))
            .map(sr => sr.noteId);

        return becca.getNotes(noteIds);
    };

    
    this.searchForNote = (query, searchParams = {}) => {
        const notes = this.searchForNotes(query, searchParams);

        return notes.length > 0 ? notes[0] : null;
    };

    this.getNotesWithLabel = attributeService.getNotesWithLabel;    
    this.getNoteWithLabel = attributeService.getNoteWithLabel;
    this.ensureNoteIsPresentInParent = cloningService.ensureNoteIsPresentInParent;
    this.ensureNoteIsAbsentFromParent = cloningService.ensureNoteIsAbsentFromParent;
    this.toggleNoteInParent = cloningService.toggleNoteInParent;
    this.createTextNote = (parentNoteId, title, content = '') => noteService.createNewNote({
        parentNoteId,
        title,
        content,
        type: 'text'
    });

    this.createDataNote = (parentNoteId, title, content = {}) => noteService.createNewNote({
        parentNoteId,
        title,
        content: JSON.stringify(content, null, '\t'),
        type: 'code',
        mime: 'application/json'
    });
    
    this.createNewNote = noteService.createNewNote;
    
    this.createNote = (parentNoteId, title, content = "", _extraOptions = {}) => {
        const parentNote = becca.getNote(parentNoteId);
        if (!parentNote) {
            throw new Error(`Unable to find parent note with ID ${parentNote}.`);
        }

        let extraOptions: NoteParams = {
            ..._extraOptions,
            content: "",
            type: "text",
            parentNoteId,
            title
        };

        // code note type can be inherited, otherwise "text" is the default
        extraOptions.type = parentNote.type === 'code' ? 'code' : 'text';
        extraOptions.mime = parentNote.type === 'code' ? parentNote.mime : 'text/html';

        if (_extraOptions.json) {
            extraOptions.content = JSON.stringify(content || {}, null, '\t');
            extraOptions.type = 'code';
            extraOptions.mime = 'application/json';
        }
        else {
            extraOptions.content = content;
        }

        return sql.transactional(() => {
            const { note, branch } = noteService.createNewNote(extraOptions);

            for (const attr of _extraOptions.attributes || []) {
                attributeService.createAttribute({
                    noteId: note.noteId,
                    type: attr.type,
                    name: attr.name,
                    value: attr.value,
                    isInheritable: !!attr.isInheritable
                });
            }

            return { note, branch };
        });
    };

    this.logMessages = {};
    this.logSpacedUpdates = {};
    
    this.log = message => {
        log.info(message);

        const { noteId } = this.startNote;

        this.logMessages[noteId] = this.logMessages[noteId] || [];
        this.logSpacedUpdates[noteId] = this.logSpacedUpdates[noteId] || new SpacedUpdate(() => {
            const messages = this.logMessages[noteId];
            this.logMessages[noteId] = [];

            ws.sendMessageToAllClients({
                type: 'api-log-messages',
                noteId,
                messages
            });
        }, 100);

        this.logMessages[noteId].push(message);
        this.logSpacedUpdates[noteId].scheduleUpdate();
    };

    this.getRootCalendarNote = dateNoteService.getRootCalendarNote;
    this.getDayNote = dateNoteService.getDayNote;
    this.getTodayNote = dateNoteService.getTodayNote;
    this.getWeekNote = dateNoteService.getWeekNote;
    this.getMonthNote = dateNoteService.getMonthNote;
    this.getYearNote = dateNoteService.getYearNote;

    this.sortNotes = (parentNoteId, sortConfig = {}) => treeService.sortNotes(
        parentNoteId,
        sortConfig.sortBy || "title",
        !!sortConfig.reverse,
        !!sortConfig.foldersFirst
    );

    this.setNoteToParent = treeService.setNoteToParent;
    this.transactional = sql.transactional;
    this.randomString = utils.randomString;
    this.escapeHtml = utils.escapeHtml;
    this.unescapeHtml = utils.unescapeHtml;
    this.sql = sql;
    this.getAppInfo = () => appInfo;

    
    this.createOrUpdateLauncher = opts => {
        if (!opts.id) { throw new Error("ID is a mandatory parameter for api.createOrUpdateLauncher(opts)"); }
        if (!opts.id.match(/[a-z0-9]{6,1000}/i)) { throw new Error(`ID must be an alphanumeric string at least 6 characters long.`); }
        if (!opts.type) { throw new Error("Launcher Type is a mandatory parameter for api.createOrUpdateLauncher(opts)"); }
        if (!["note", "script", "customWidget"].includes(opts.type)) { throw new Error(`Given launcher type '${opts.type}'`); }
        if (!opts.title?.trim()) { throw new Error("Title is a mandatory parameter for api.createOrUpdateLauncher(opts)"); }
        if (opts.type === 'note' && !opts.targetNoteId) { throw new Error("targetNoteId is mandatory for launchers of type 'note'"); }
        if (opts.type === 'script' && !opts.scriptNoteId) { throw new Error("scriptNoteId is mandatory for launchers of type 'script'"); }
        if (opts.type === 'customWidget' && !opts.widgetNoteId) { throw new Error("widgetNoteId is mandatory for launchers of type 'customWidget'"); }

        const parentNoteId = opts.isVisible ? '_lbVisibleLaunchers' : '_lbAvailableLaunchers';
        const noteId = 'al_' + opts.id;

        const launcherNote =
            becca.getNote(noteId) ||
            specialNotesService.createLauncher({
                noteId: noteId,
                parentNoteId: parentNoteId,
                launcherType: opts.type,
            }).note;

        if (launcherNote.title !== opts.title) {
            launcherNote.title = opts.title;
            launcherNote.save();
        }

        if (launcherNote.getParentBranches().length === 1) {
            const branch = launcherNote.getParentBranches()[0];

            if (branch.parentNoteId !== parentNoteId) {
                branchService.moveBranchToNote(branch, parentNoteId);
            }
        }

        if (opts.type === 'note') {
            launcherNote.setRelation('target', opts.targetNoteId);
        } else if (opts.type === 'script') {
            launcherNote.setRelation('script', opts.scriptNoteId);
        } else if (opts.type === 'customWidget') {
            launcherNote.setRelation('widget', opts.widgetNoteId);
        } else {
            throw new Error(`Unrecognized launcher type '${opts.type}'`);
        }

        if (opts.keyboardShortcut) {
            launcherNote.setLabel('keyboardShortcut', opts.keyboardShortcut);
        } else {
            launcherNote.removeLabel('keyboardShortcut');
        }

        if (opts.icon) {
            launcherNote.setLabel('iconClass', `bx ${opts.icon}`);
        } else {
            launcherNote.removeLabel('iconClass');
        }

        return { note: launcherNote };
    };

    this.exportSubtreeToZipFile = async (noteId, format, zipFilePath) => await exportService.exportToZipFile(noteId, format, zipFilePath);

    this.runOnFrontend = async (_script, params = []) => {
        let script: string;
        if (typeof _script === "string") {
            script = _script;
        } else {
            script = _script.toString();
        }

        ws.sendMessageToAllClients({
            type: 'execute-script',
            script: script,
            params: prepareParams(params),
            startNoteId: this.startNote.noteId,
            currentNoteId: this.currentNote.noteId,
            originEntityName: "notes", // currently there's no other entity on the frontend which can trigger event
            originEntityId: ("noteId" in this.originEntity && (this.originEntity as BNote)?.noteId) || null
        });

        function prepareParams(params: any[]) {
            if (!params) {
                return params;
            }

            return params.map(p => {
                if (typeof p === "function") {
                    return `!@#Function: ${p.toString()}`;
                }
                else {
                    return p;
                }
            });
        }
    };
    
    this.runOutsideOfSync = syncMutex.doExclusively;
    this.backupNow = backupService.backupNow;
   
    this.__private = {
        becca
    }
}

export = BackendScriptApi as any as {
    new (currentNote: BNote, apiParams: ApiParams): Api
};