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/*
 * Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.ws.transport.httpspi.servlet;

import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * HTTP request and response headers are represented by this class which implements
 * the interface {@link java.util.Map}<
 * {@link String},{@link java.util.List}<{@link String}>>.
 * The keys are case-insensitive Strings representing the header names and
 * the value associated with each key is a {@link java.util.List}<{@link String}> with one
 * element for each occurence of the header name in the request or response.
 * 
 * For example, if a response header instance contains one key "HeaderName" with two values "value1 and value2"
 * then this object is output as two header lines:
 * 
 * HeaderName: value1
 * HeaderName: value2
 * 
 * 
 * All the normal {@link java.util.Map} methods are provided, but the following
 * additional convenience methods are most likely to be used:
 * 

 * {@link #getFirst(String)} returns a single valued header or the first value of
 * a multi-valued header.
 * {@link #add(String,String)} adds the given header value to the list for the given key
 * {@link #set(String,String)} sets the given header field to the single value given
 * overwriting any existing values in the value list.
 * 
 * All methods in this class accept null values for keys and values. However, null
 * keys will never will be present in HTTP request headers, and will not be output/sent in response headers.
 * Null values can be represented as either a null entry for the key (i.e. the list is null) or
 * where the key has a list, but one (or more) of the list's values is null. Null values are output
 * as a header line containing the key but no associated value.
 * @since 1.6
 */
public class Headers implements Map> {

    HashMap> map;

    public Headers() {
        map = new HashMap<>(32);
    }

    /* Normalize the key by converting to following form.
     * First char upper case, rest lower case.
     * key is presumed to be ASCII
     */
    private String normalize (String key) {
        if (key == null) {
            return null;
        }
        int len = key.length();
        if (len == 0) {
            return key;
        }
        char[] b;
        String s;
        b = key.toCharArray();
        if (b[0] >= 'a' && b[0] <= 'z') {
            b[0] = (char) (b[0] - ('a' - 'A'));
        }
        for (int i = 1; i < len; i++) {
            if (b[i] >= 'A' && b[i] <= 'Z') {
                b[i] = (char) (b[i] + ('a' - 'A'));
            }
        }
        s = new String(b);
        return s;
    }

    @Override
    public int size() {
        return map.size();
    }

    @Override
    public boolean isEmpty() {
        return map.isEmpty();
    }

    @Override
    public boolean containsKey(Object key) {
        if (key == null) {
            return false;
        }
        if (!(key instanceof String)) {
            return false;
        }
        return map.containsKey (normalize((String)key));
    }

    @Override
    public boolean containsValue(Object value) {
        return map.containsValue(value);
    }

    @Override
    public List get(Object key) {
        return map.get(normalize((String)key));
    }

    /**
     * returns the first value from the List of String values
     * for the given key (if at least one exists).
     * @param key the key to search for
     * @return the first string value associated with the key
     */
    public String getFirst (String key) {
        List l = map.get(normalize(key));
        if (l == null) {
            return null;
        }
        return l.get(0);
    }

    @Override
    public List put(String key, List value) {
        return map.put (normalize(key), value);
    }

    /**
     * adds the given value to the list of headers
     * for the given key. If the mapping does not
     * already exist, then it is created
     * @param key the header name
     * @param value the header value to add to the header
     */
    public void add (String key, String value) {
        String k = normalize(key);
        List l = map.computeIfAbsent(k, k1 -> new LinkedList<>());
        l.add (value);
    }

    /**
     * sets the given value as the sole header value
     * for the given key. If the mapping does not
     * already exist, then it is created
     * @param key the header name
     * @param value the header value to set.
     */
    public void set (String key, String value) {
        LinkedList l = new LinkedList<>();
        l.add (value);
        put (key, l);
    }


    @Override
    public List remove(Object key) {
        return map.remove(normalize((String)key));
    }

    @Override
    public void putAll(Map> t)  {
        for(Entry> entry : t.entrySet()) {
            put(entry.getKey(), entry.getValue());
        }
    }

    @Override
    public void clear() {
        map.clear();
    }

    @Override
    public Set keySet() {
        return map.keySet();
    }

    @Override
    public Collection> values() {
        return map.values();
    }

    @Override
    public Set>> entrySet() {
        return map.entrySet();
    }

    @Override
    public boolean equals(Object o) {
        return map.equals(o);
    }

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

    @Override
    public String toString() {
        return map.toString();
    }
}