#ifndef OS_H
#define OS_H

#include "core.h"

// ### Memory ###
void *os_alloc(uint64 capacity);
void os_reserve(void *ptr);
void os_decommit(void *ptr);
void os_free(void *ptr, uint64 freeSize);

// ### File IO ###
string os_readEntireFile(Arena *arena, string filename);
bool os_writeEntireFile(Arena *arena, string filename, const byte *contents, uint64 contentsLength);
bool os_fileAppend(Arena *arena, string filename, const byte *contents, uint64 contentsLength);

// ### Standard IO ###
void os_print(StdStream target, const char *fmt, va_list argList);
void os_println(StdStream target, const char *fmt, va_list argList);

// ### Multithreading ###
typedef struct OS_Thread OS_Thread;
struct OS_Thread {
    uint64 id;
};

OS_Thread os_createThread(void *(*entry)(void *ctx), void *ctx);

// ### Network I/O ###
typedef struct Address Address;
struct Address;

typedef struct SocketHandle SocketHandle;
struct SocketHandle;

typedef struct ServerEvents ServerEvents;
struct ServerEvents;

typedef struct Socket Socket;
struct Socket {
    const Address *address;
    SocketHandle *handle;
    bool closed;
};
DefineList(Socket, Socket);

typedef struct Server Server;
struct Server {
    Arena *arena;
    Address *address;
    uint32 port;
    SocketHandle *handle;
    SocketList clients;
    bool listening;
    ServerEvents *events;
};

typedef struct ServerInitInfo ServerInitInfo;
struct ServerInitInfo {
    int16 port;
    int32 concurrentClients;
    int64 memory;
    int32 maxEvents;
};

typedef struct SocketConnectInfo SocketConnectInfo;
struct SocketConnectInfo {
    string address;
    uint16 port;
    bool blocking;
};


// Server/Client interface
Server serverInit(ServerInitInfo info);

void serverListen(Server *s);

Socket *serverAccept(Server *s);

void serverClose(Server *s);

enum ServerEventType {
    ServerEventType_AcceptClient,
    ServerEventType_ClientMessage,
    ServerEventType_None,
    ServerEventType_COUNT,
};

typedef struct ServerEvent ServerEvent;
struct ServerEvent {
    enum ServerEventType type;
    union {
        struct {} tAcceptClient;
        struct {
            int32 clientId;
            Socket *client;
        } tClientMessage;
    };
};

ServerEvent *serverGetNextEvent(Server *s);

// Generic socket interface
Socket socketConnect(Arena *arena, SocketConnectInfo info);

int64 socketRead(Socket *s, byte *dest, uint64 numBytes);

DefineResult(string, String);
StringResult socketReadStr(Arena *arena, Socket *s);

int64 socketWrite(Socket *s, byte *source, uint64 numBytes);

int64 socketWriteStr(Socket *socket, string data);

void socketClose(Socket *s);

#endif