#pragma once

#include <AK/HashMap.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibGUI/GModel.h>
#include <unistd.h>

class GraphWidget;

struct PidAndTid {
    bool operator==(const PidAndTid& other) const
    {
        return pid == other.pid && tid == other.tid;
    }
    pid_t pid;
    int tid;
};

class ProcessModel final : public GModel {
public:
    enum Column {
        Icon = 0,
        Name,
        CPU,
        State,
        Priority,
        User,
        PID,
        TID,
        Virtual,
        Physical,
        PurgeableVolatile,
        PurgeableNonvolatile,
        Syscalls,
        InodeFaults,
        ZeroFaults,
        CowFaults,
        FileReadBytes,
        FileWriteBytes,
        UnixSocketReadBytes,
        UnixSocketWriteBytes,
        IPv4SocketReadBytes,
        IPv4SocketWriteBytes,
        __Count
    };

    static ProcessModel& the();

    static NonnullRefPtr<ProcessModel> create() { return adopt(*new ProcessModel); }
    virtual ~ProcessModel() override;

    virtual int row_count(const GModelIndex&) const override;
    virtual int column_count(const GModelIndex&) const override;
    virtual String column_name(int column) const override;
    virtual ColumnMetadata column_metadata(int column) const override;
    virtual GVariant data(const GModelIndex&, Role = Role::Display) const override;
    virtual void update() override;

    Function<void(float)> on_new_cpu_data_point;

private:
    ProcessModel();

    struct ThreadState {
        int tid;
        pid_t pid;
        unsigned times_scheduled;
        String name;
        String state;
        String user;
        String priority;
        size_t amount_virtual;
        size_t amount_resident;
        size_t amount_purgeable_volatile;
        size_t amount_purgeable_nonvolatile;
        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;
        float cpu_percent;
        int icon_id;
    };

    struct Thread {
        ThreadState current_state;
        ThreadState previous_state;
    };

    HashMap<uid_t, String> m_usernames;
    HashMap<PidAndTid, NonnullOwnPtr<Thread>> m_threads;
    Vector<PidAndTid> m_pids;
    RefPtr<GraphicsBitmap> m_generic_process_icon;
    RefPtr<GraphicsBitmap> m_high_priority_icon;
    RefPtr<GraphicsBitmap> m_low_priority_icon;
    RefPtr<GraphicsBitmap> m_normal_priority_icon;
};

namespace AK {
template<>
struct Traits<PidAndTid> : public GenericTraits<PidAndTid> {
    static unsigned hash(const PidAndTid& value) { return pair_int_hash(value.pid, value.tid); }
};
}
