/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/HashMap.h>
#include <AK/String.h>
#include <unistd.h>

namespace Core {

struct ThreadStatistics {
    pid_t tid;
    unsigned times_scheduled;
    unsigned ticks;
    unsigned syscall_count;
    unsigned inode_faults;
    unsigned zero_faults;
    unsigned cow_faults;
    unsigned unix_socket_read_bytes;
    unsigned unix_socket_write_bytes;
    unsigned ipv4_socket_read_bytes;
    unsigned ipv4_socket_write_bytes;
    unsigned file_read_bytes;
    unsigned file_write_bytes;
    String state;
    u32 cpu;
    u32 priority;
    u32 effective_priority;
    String name;
};

struct ProcessStatistics {
    // Keep this in sync with /proc/all.
    // From the kernel side:
    pid_t pid;
    unsigned pgid;
    unsigned pgp;
    unsigned sid;
    uid_t uid;
    gid_t gid;
    pid_t ppid;
    unsigned nfds;
    String name;
    String tty;
    String pledge;
    String veil;
    size_t amount_virtual;
    size_t amount_resident;
    size_t amount_shared;
    size_t amount_dirty_private;
    size_t amount_clean_inode;
    size_t amount_purgeable_volatile;
    size_t amount_purgeable_nonvolatile;
    int icon_id;

    Vector<Core::ThreadStatistics> threads;

    // synthetic
    String username;
};

class ProcessStatisticsReader {
public:
    static HashMap<pid_t, Core::ProcessStatistics> get_all();

private:
    static String username_from_uid(uid_t);
    static HashMap<uid_t, String> s_usernames;
};

}