/**
 * @source: https://github.com/jnetterf/satie/
 *
 * @license
 * (C) Josh Netterfield <joshua@nettek.ca> 2015.
 * Part of the Satie music engraver <https://github.com/jnetterf/satie>.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import {forEach, once} from "lodash";
import * as invariant from "invariant";

import {markPreloaded, setRoot} from "./private_fontManager";

import AttributesExports from "./implAttributes_attributesModel";
import AttributesPostprocessor from "./implAttributes_attributesPostprocessor";

import Barline from "./implBarline_barlineModel";

import Chord from "./implChord_chordModel";
import VoiceStaffStemDirection from "./implChord_voiceStaffStemDirectionPreprocessor";
import BeamPostprocessor from "./implChord_beamPostprocessor";
import TiedsPostprocessor from "./implChord_tiedsPostprocessor";

import Direction from "./implDirection_directionModel";
import FiguredBass from "./implFiguredBass_figuredBassModel";
import Grouping from "./implGrouping_groupingModel";
import Harmony from "./implHarmony_harmonyModel";
import Print from "./implPrint_printModel";
import Proxy from "./implProxy_proxyModel";
import Sound from "./implSound_soundModel";
import Spacer from "./implSpacer_spacerModel";
import VisualCursorModel from "./implVisualCursor_visualCursorModel";

import CenterPostprocessor from "./implLine_centerPostprocessor";
import JustifyPostprocessor from "./implLine_justifyPostprocessor";
import PadPostprocessor from "./implLine_padPostprocessor";
import RemoveOverlapsPostprocessor from "./implLine_removeOverlapsPostprocessor";

import Factory from "./engine_factory";

module BrowserSetup {
    export let cssInjected = false;

    export let injectStyles = once(function injectStyles(spec: ISatieOptions = {}): void {
        cssInjected = true;
        if (typeof window === "undefined") {
            return;
        }

        let style = document.createElement("style");
        style.appendChild(document.createTextNode("")); // WebKit hack
        document.head.appendChild(style);

        forEach(spec.preloadedFonts, font => {
            let baseFont = (/[\w\s]*/.exec(font) || [""])[0].replace(/\s/g, " ").trim();
            if (!baseFont) {
                throw new Error("Font " + font + " is not a valid font name.");
            }
            let variant = (/\((\w*)\)/.exec(font) || [])[1] || undefined;
            if (variant && variant !== "bold" && variant !== "bold italic" && variant !== "italic") {
                throw new Error("Valid font variants are bold, bold italic, and italic");
            }

            markPreloaded(baseFont, variant);
        });

        if (spec.satieRoot) {
            setRoot(spec.satieRoot);
        }

        style.innerHTML =
            ".mn_ {" +
                "-moz-user-select: none;" +
                "-ms-user-select: none;" +
                "-webkit-touch-callout: none;" +
                "-webkit-user-select: none;" +
                "cursor: default;" +
                "font-family: 'bravura';" +
                "user-select: none;" +
                "text-rendering: optimizeSpeed;" +
            "}" +
            ".mmn_ {" +
                "font-family: 'Alegreya';" +
                "font-style: italic;" +
                "text-anchor: middle;" +
                "fill: #444;" +
            "}" +
            ".bn_ {" +
                "font-family: 'Alegreya';" +
                "font-style: italic;" +
                "text-anchor: end;" +
                "fill: #7a7a7a;" +
            "}";
    });
}

/**
 * Optional initialization function. Call this if you don't want the default options. Must be called
 * before any Satie component is mounted, and must only be called once.
 */
export function init(options: ISatieOptions): void {
    invariant(!BrowserSetup.cssInjected,
        "init must be called before any Satie component is mounted " +
        "and must only be called once");

    BrowserSetup.injectStyles(options);
}

/**
 * Options to pass into init(...). No options are required.
 */
export interface ISatieOptions {
    /**
     * For web browsers only.
     * 
     * A list of fonts and variants (in parentheses) that are included on a webpage, that Satie
     * should not automatically load. You can get better performance improvements by putting font
     * loading inside your's HTML file's `<head></head>`
     *
     * e.g., "Alegreya", "Alegreya (bold)", "Bravura"
     */
    preloadedFonts?: string[];

    /**
     * For web browsers only.
     * 
     * Specify where all the files Satie needs are.
     * By default, Satie looks inside `http[s]://vendor/`.
     */
    satieRoot?: string;
}

export function makeFactory() {
    return new Factory(
        [
            AttributesExports,
            Barline,
            Chord,
            Direction,
            FiguredBass,
            Grouping,
            Harmony,
            Print,
            Proxy,
            Sound,
            Spacer,
            VisualCursorModel,
        ],
        [
            VoiceStaffStemDirection,
        ],
        [
            PadPostprocessor,
            JustifyPostprocessor,
            BeamPostprocessor,
            CenterPostprocessor,
            AttributesPostprocessor,
            TiedsPostprocessor,
            RemoveOverlapsPostprocessor,
        ]
    );
}