/*
    This file is part of the Burn-My-Windows project.

    SPDX-FileCopyrightText: 2018, 2021, 2022 Vlad Zahorodnii <vlad.zahorodnii@kde.org>, Martin Flöser <mgraesslin@kde.org>, Simon Schneegans <code@simonschneegans.de>

    SPDX-License-Identifier: GPL-3.0-or-later
*/

"use strict";

const blacklist = [
    // The logout screen has to be animated only by the logout effect.
    "ksmserver ksmserver",
    "ksmserver-logout-greeter ksmserver-logout-greeter",

    // KDE Plasma splash screen has to be animated only by the login effect.
    "ksplashqml ksplashqml"
];

class %EFFECT_CLASS% {
    constructor() {
        effect.configChanged.connect(this.loadConfig.bind(this));
        effect.animationEnded.connect(this.cleanupForcedRoles.bind(this));
        effects.windowAdded.connect(this.slotWindowAdded.bind(this));
        effects.windowClosed.connect(this.slotWindowClosed.bind(this));
        effects.windowDataChanged.connect(this.slotWindowDataChanged.bind(this));

        this.shader = effect.addFragmentShader(Effect.MapTexture, "%SHADER_NAME%.frag");

        this.loadConfig();
    }

    // A small helper which can be used to read a hex color string (e.g. #ff3244) from the
    // settings. This method will return an array of four floating point values
    // [r, g, b, a]. If the settings key only refers to an rgb value, the alpha component
    // will be set to 1.0.
    readRGBAConfig(key) {
        const color = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})?([a-f\d]{2})?$/i
                        .exec(effect.readConfig(key, '#ffffff'))
                        .slice(1)
                        .filter(x => x !== undefined)
                        .map(x => parseInt(x, 16) / 255);
        return color.length == 3 ? [color[0], color[1], color[2], 1.0] :
                                [color[1], color[2], color[3], color[0]];
    }

    // A small helper which can be used to read a hex color string (e.g. #ff3244) from the
    // settings. This method will return an array of three floating point values [r, g, b]
    // regardless of whether the settings key actually refers to an argb hex string.
    readRGBConfig(key) {
        const color = this.readRGBAConfig(key);
        color.pop();
        return color;
    }

    loadConfig() {
        this.duration = animationTime(effect.readConfig('Duration', 1000));

        %ON_SETTINGS_CHANGE%
    }

    static isScaleWindow(window) {
        // We don't want to animate most of plasmashell's windows, yet, some
        // of them we want to, for example, Task Manager Settings window.
        // The problem is that all those window share single window class.
        // So, the only way to decide whether a window should be animated is
        // to use a heuristic: if a window has decoration, then it's most
        // likely a dialog or a settings window so we have to animate it.
        if (window.windowClass == "plasmashell plasmashell"
                || window.windowClass == "plasmashell org.kde.plasmashell") {
            return window.hasDecoration;
        }

        if (blacklist.indexOf(window.windowClass) != -1) {
            return false;
        }

        if (window.hasDecoration) {
            return true;
        }

        // Don't animate combobox popups, tooltips, popup menus, etc.
        if (window.popupWindow) {
            return false;
        }

        // Dont't animate the outline and the screenlocker as it looks bad.
        if (window.lockScreen || window.outline) {
            return false;
        }

        // Override-redirect windows are usually used for user interface
        // concepts that are not expected to be animated by this effect.
        if (!window.managed) {
            return false;
        }

        return window.normalWindow || window.dialog;
    }

    setupForcedRoles(window) {
        window.setData(Effect.WindowForceBackgroundContrastRole, true);
        window.setData(Effect.WindowForceBlurRole, true);
    }

    cleanupForcedRoles(window) {
        window.setData(Effect.WindowForceBackgroundContrastRole, null);
        window.setData(Effect.WindowForceBlurRole, null);
    }

    slotWindowAdded(window) {
        if (effects.hasActiveFullScreenEffect) {
            return;
        }
        if (!%EFFECT_CLASS%.isScaleWindow(window)) {
            return;
        }
        if (!window.visible) {
            return;
        }
        if (effect.isGrabbed(window, Effect.WindowAddedGrabRole)) {
            return;
        }
        this.setupForcedRoles(window);

        effect.setUniform(this.shader, 'uForOpening', 1.0);

        %ON_ANIMATION_BEGIN%

        window.scaleInAnimation = animate({
            window: window,
            curve: QEasingCurve.Linear,
            duration: this.duration,
            animations: [
                {
                    type: Effect.ShaderUniform,
                    fragmentShader: this.shader,
                    uniform: "uProgress",
                    from: 0.0,
                    to: 1.0
                }
            ]
        });
    }

    slotWindowClosed(window) {
        if (effects.hasActiveFullScreenEffect) {
            return;
        }
        if (!%EFFECT_CLASS%.isScaleWindow(window)) {
            return;
        }
        if (!window.visible || window.skipsCloseAnimation) {
            return;
        }
        if (effect.isGrabbed(window, Effect.WindowClosedGrabRole)) {
            return;
        }
        if (window.scaleInAnimation) {
            cancel(window.scaleInAnimation);
            delete window.scaleInAnimation;
        }
        this.setupForcedRoles(window);

        effect.setUniform(this.shader, 'uForOpening', 0.0);

        %ON_ANIMATION_BEGIN%

        window.scaleOutAnimation = animate({
            window: window,
            curve: QEasingCurve.Linear,
            duration: this.duration,
            animations: [
                {
                    type: Effect.ShaderUniform,
                    fragmentShader: this.shader,
                    uniform: "uProgress",
                    from: 0.0,
                    to: 1.0
                }
            ]
        });
    }

    slotWindowDataChanged(window, role) {
        if (role == Effect.WindowAddedGrabRole) {
            if (window.scaleInAnimation && effect.isGrabbed(window, role)) {
                cancel(window.scaleInAnimation);
                delete window.scaleInAnimation;
                this.cleanupForcedRoles(window);
            }
        } else if (role == Effect.WindowClosedGrabRole) {
            if (window.scaleOutAnimation && effect.isGrabbed(window, role)) {
                cancel(window.scaleOutAnimation);
                delete window.scaleOutAnimation;
                this.cleanupForcedRoles(window);
            }
        }
    }
}

new %EFFECT_CLASS%();