// *****************************************************************************
// 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 as Uri } from 'vscode-uri';
import { Path } from './path';

export class URI {

    public static fromComponents(components: UriComponents): URI;
    public static fromComponents(components: undefined): undefined;
    public static fromComponents(components: UriComponents | undefined): URI | undefined {
        return components ? new URI(Uri.from(components)) : undefined;
    }

    public static fromFilePath(path: string): URI {
        return new URI(Uri.file(path));
    }

    private readonly codeUri: Uri;
    private _path: Path | undefined;

    constructor(uri: string | Uri = '') {
        if (uri instanceof Uri) {
            this.codeUri = uri;
        } else {
            this.codeUri = Uri.parse(uri);
        }
    }

    /**
     * TODO move implementation to `DefaultUriLabelProviderContribution.getName`
     *
     * @deprecated use `LabelProvider.getName` instead
     */
    get displayName(): string {
        const base = this.path.base;
        if (base) {
            return base;
        }
        if (this.path.isRoot) {
            return this.path.fsPath();
        }
        return '';
    }

    /**
     * Return all uri from the current to the top most.
     */
    get allLocations(): URI[] {
        const locations = [];
        let location: URI = this;
        while (!location.path.isRoot && location.path.hasDir) {
            locations.push(location);
            location = location.parent;
        }
        locations.push(location);
        return locations;
    }

    get parent(): URI {
        if (this.path.isRoot) {
            return this;
        }
        return this.withPath(this.path.dir);
    }

    relative(uri: URI): Path | undefined {
        if (this.authority !== uri.authority || this.scheme !== uri.scheme) {
            return undefined;
        }
        return this.path.relative(uri.path);
    }

    resolve(path: string | Path): URI {
        return this.withPath(this.path.join(path.toString()));
    }

    /**
     * @returns a new, absolute URI if one can be computed from the path segments passed in.
     */
    resolveToAbsolute(...pathSegments: Array<string | Path>): URI | undefined {
        const absolutePath = this.path.resolve(...pathSegments.map(path => path.toString()));
        if (absolutePath) {
            return this.withPath(absolutePath);
        }
    }

    /**
     * return a new URI replacing the current with the given scheme
     */
    withScheme(scheme: string): URI {
        const newCodeUri = Uri.from({
            ...this.codeUri.toJSON(),
            scheme
        });
        return new URI(newCodeUri);
    }

    /**
     * return a new URI replacing the current with the given authority
     */
    withAuthority(authority: string): URI {
        const newCodeUri = Uri.from({
            ...this.codeUri.toJSON(),
            scheme: this.codeUri.scheme,
            authority
        });
        return new URI(newCodeUri);
    }

    /**
     * return this URI without a authority
     */
    withoutAuthority(): URI {
        return this.withAuthority('');
    }

    /**
     * return a new URI replacing the current with the given path
     */
    withPath(path: string | Path): URI {
        const newCodeUri = Uri.from({
            ...this.codeUri.toJSON(),
            scheme: this.codeUri.scheme,
            path: path.toString()
        });
        return new URI(newCodeUri);
    }

    /**
     * return this URI without a path
     */
    withoutPath(): URI {
        return this.withPath('');
    }

    /**
     * return a new URI replacing the current with the given query
     */
    withQuery(query: string): URI {
        const newCodeUri = Uri.from({
            ...this.codeUri.toJSON(),
            scheme: this.codeUri.scheme,
            query
        });
        return new URI(newCodeUri);
    }

    /**
     * return this URI without a query
     */
    withoutQuery(): URI {
        return this.withQuery('');
    }

    /**
     * return a new URI replacing the current with the given fragment
     */
    withFragment(fragment: string): URI {
        const newCodeUri = Uri.from({
            ...this.codeUri.toJSON(),
            scheme: this.codeUri.scheme,
            fragment
        });
        return new URI(newCodeUri);
    }

    /**
     * return this URI without a fragment
     */
    withoutFragment(): URI {
        return this.withFragment('');
    }

    /**
     * return a new URI replacing the current with its normalized path, resolving '..' and '.' segments
     */
    normalizePath(): URI {
        return this.withPath(this.path.normalize());
    }

    get scheme(): string {
        return this.codeUri.scheme;
    }

    get authority(): string {
        return this.codeUri.authority;
    }

    get path(): Path {
        if (this._path === undefined) {
            this._path = new Path(this.codeUri.path);
        }
        return this._path;
    }

    get query(): string {
        return this.codeUri.query;
    }

    get fragment(): string {
        return this.codeUri.fragment;
    }

    toString(skipEncoding?: boolean): string {
        return this.codeUri.toString(skipEncoding);
    }

    isEqual(uri: URI, caseSensitive: boolean = true): boolean {
        if (!this.hasSameOrigin(uri)) {
            return false;
        }

        return caseSensitive
            ? this.toString() === uri.toString()
            : this.toString().toLowerCase() === uri.toString().toLowerCase();
    }

    isEqualOrParent(uri: URI, caseSensitive: boolean = true): boolean {
        if (!this.hasSameOrigin(uri)) {
            return false;
        }
        let left = this.path;
        let right = uri.path;
        if (!caseSensitive) {
            left = new Path(left.toString().toLowerCase());
            right = new Path(right.toString().toLowerCase());
        }
        return left.isEqualOrParent(right);
    }

    static getDistinctParents(uris: URI[]): URI[] {
        const result: URI[] = [];
        uris.forEach((uri, i) => {
            if (!uris.some((otherUri, index) => index !== i && otherUri.isEqualOrParent(uri))) {
                result.push(uri);
            }
        });
        return result;
    }

    private hasSameOrigin(uri: URI): boolean {
        return (this.authority === uri.authority) && (this.scheme === uri.scheme);
    }

    toComponents(): UriComponents {
        return {
            scheme: this.scheme,
            authority: this.authority,
            path: this.path.toString(),
            query: this.query,
            fragment: this.fragment
        };
    }
}

export interface UriComponents {
    scheme: string;
    authority: string;
    path: string;
    query: string;
    fragment: string;
    external?: string;
}

export default URI;