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/**
 * Copyright (C) 2020 WaveMaker, Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 

 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.wavemaker.commons.io;

import java.io.Serializable;

import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;

/**
 * A file or folder path.
 * 
 * @author Phillip Webb
 */
public final class ResourcePath implements Serializable {

    private final ResourcePath parent;

    private final String name;

    /**
     * Create a new root path instance.
     */
    public ResourcePath() {
        this(null, "");
    }

    /**
     * Private constructor used to create a nested path.
     * 
     * @param parent the parent
     * @param name the name of the path element
     * @see #get(String)
     */
    private ResourcePath(ResourcePath parent, String name) {
        Assert.notNull(name, "Name must not be null");
        this.parent = parent;
        this.name = name;
    }

    /**
     * Returns the name of the path element.
     * 
     * @return the name
     */
    public String getName() {
        return this.name;
    }

    /**
     * Returns the full path value.
     * 
     * @return the path value
     */
    @Override
    public String toString() {
        if (this.parent != null) {
            return this.parent + "/" + this.name;
        }
        return this.name;
    }

    public String toStringRelativeTo(String source) {
        Assert.notNull(source, "Source must not be null");
        return toStringRelativeTo(new ResourcePath().get(source));
    }

    public String toStringRelativeTo(ResourcePath source) {
        Assert.notNull(source, "Source must not be null");
        if (source.equals(this)) {
            return "";
        }
        String sourcePath = source.toString() + "/";
        Assert.isTrue(toString().startsWith(sourcePath), "Source '" + source + "' must be a parent of '" + this + "'");
        return toString().substring(sourcePath.length());
    }

    /**
     * Get a new path relative to this one.
     * 
     * @param path the path to obtain.
     * @return a new path
     */
    public ResourcePath get(String path) {
        Assert.hasLength(path, "Path must not be empty");
        ResourcePath rtn = this;
        if (path.startsWith("/")) {
            rtn = new ResourcePath();
            path = path.substring(1);
        }
        while (path.indexOf('/') != -1) {
            rtn = rtn.newPath(path.substring(0, path.indexOf('/')));
            path = path.substring(path.indexOf('/') + 1);
        }
        return rtn.newPath(path);
    }

    /**
     * Internal factory method used to create a new path item.
     * 
     * @param name the name of the path
     * @return the new Path element
     */
    private ResourcePath newPath(String name) {
        if ("".equals(name)) {
            return this;
        }
        if ("..".equals(name)) {
            Assert.state(this.parent != null,"[Assertion failed] - Parent cannot be null");
            return this.parent;
        }
        return new ResourcePath(this, name);
    }

    /**
     * Returns the parent of the path or null if this is a root path.
     * 
     * @return the parent or null
     */
    public ResourcePath getParent() {
        return this.parent;
    }

    /**
     * Returns true if this path is a root path.
     * 
     * @return if this is a root path
     */
    public boolean isRootPath() {
        if (this.parent != null) {
            return false;
        }
        return "".equals(this.name);
    }

    /**
     * Append the given path to this path
     * 
     * @param path the path to append
     * @return a new path
     */
    public ResourcePath append(ResourcePath path) {
        Assert.notNull(path, "Path must not be null");
        if (path.isRootPath()) {
            return this;
        }
        if (path.getParent() == null) {
            return new ResourcePath(this, path.getName());
        }
        return new ResourcePath(append(path.getParent()), path.getName());
    }

    @Override
    public int hashCode() {
        return toString().hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (obj == this) {
            return true;
        }
        if (obj instanceof ResourcePath) {
            ResourcePath other = (ResourcePath) obj;
            return ObjectUtils.nullSafeEquals(getParent(), other.getParent()) && this.name.equals(other.name);
        }
        return false;
    }
}