// *****************************************************************************
// Copyright (C) 2017 TypeFox and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************

import { URI } from 'vscode-uri';

export type ThemeType = 'light' | 'dark' | 'hc' | 'hcLight';

export type ThemeMode = 'light' | 'dark';

export interface Theme {
    readonly id: string;
    readonly type: ThemeType;
    readonly label: string;
    readonly description?: string;
    readonly editorTheme?: string;
    activate?(): void;
    deactivate?(): void;
}

export function isHighContrast(scheme: ThemeType): boolean {
    return scheme === 'hc' || scheme === 'hcLight';
}

export function getThemeMode(type: ThemeType): ThemeMode {
    return (type === 'hc' || type === 'dark') ? 'dark' : 'light';
}

export interface ThemeChangeEvent {
    readonly newTheme: Theme;
    readonly oldTheme?: Theme;
}

export interface ThemeColor {
    readonly id: string;
}

// Copied from https://github.com/microsoft/vscode/blob/1.106.1/src/vs/base/common/themables.ts
export function isThemeColor(obj: unknown): obj is ThemeColor {
    return !!obj && typeof obj === 'object' && typeof (<ThemeColor>obj).id === 'string';
}

export interface ThemeIcon {
    readonly id: string;
    readonly color?: ThemeColor;
}

// Copied and modified from https://github.com/microsoft/vscode/blob/1.106.1/src/vs/base/common/themables.ts
export function isThemeIcon(obj: unknown): obj is ThemeIcon {
    return !!obj &&
        typeof obj === 'object' &&
        typeof (<ThemeIcon>obj).id === 'string' &&
        (typeof (<ThemeIcon>obj).color === 'undefined' || isThemeColor((<ThemeIcon>obj).color));
}

export interface IconDefinition {
    font?: IconFontContribution; // undefined for the default font (codicon)
    fontCharacter: string;
}

export interface IconFontContribution {
    readonly id: string;
    readonly definition: IconFontDefinition;
}

export interface IconFontDefinition {
    readonly weight?: string;
    readonly style?: string;
    readonly src: IconFontSource[];
}

export interface IconFontSource {
    readonly location: URI;
    readonly format: string;
}