#include "../../../include/kernel.h"
#include "../../../include/network.h"


// ============================================≠=========
//   Developer >  : Bıgpower
//   Maintiner >  : Bıgpower
//       ____  _________  ____  ____ _       _______ ____  _______ _  _______ __ 
//     / __ )/  _/ ____// __ \/ __ \ | / / ____/ __ \/ / / / ____/ __ \/ |/ / ____/ / 
//    / __  |/ // / __ / /_/ / / / / |/ / __/ / /_/ / / / / __/ / /_/ /  / / __/ / /  
//   / /_/ // // /_/ // ____/ /_/ /|  / /___/ _, _/ /_/ / /___/ _, _/ /|  / /___/ /___
//  /_____/___/\____//_/    \____/ | /_____/_/ |_|\____/_____/_/ |_/_/ |_/_____/_____/
//                                 |/
// =======================================================

#define RTL_VENDOR_ID     0x10EC
#define RTL_DEVICE_8111   0x8168
#define RTL_DEVICE_8111B  0x8136
#define RTL_DEVICE_8111C  0x8169

/* ----------------------------------------------
  *       Developer >  : Bıgpower                 *
  *       Maintainer >  : Bıgpower                *
  * ----------------------------------------------*
  *     Producer & Director > : Bıgpower          *
  * ----------------------------------------------*/


#define RTL_MACO        0x00
#define RTL_MARO        0x08
#define RTL_TXSTATUSO   0x10
#define RTL_TXADDR0     0x20
#define RTL_RXBUF       0x30
#define RTL_CMD         0x37
#define RTL_RXBUFPTR    0x38
#define RTL_RXBUFADDR   0x3A
#undef RTL_IMR
#define RTL_IMR         0x3C
#define RTL_ISR         0x3E
#define RTL_TCR         0x40
#define RTL_RCR         0x44
#define RTL_MPC         0x4C
#define RTL_CONFIG1     0x52
#define RTL_MSR         0x58
#define RTL_BMCR        0x62


#define RTL_CMD_RESET    0x10
#define RTL_CMD_RX_EN    0x08
#define RTL_CMD_TX_EN    0x04

#define RTL_ISR_ROK     0x0001
#define RTL_ISR_TOK     0x0004
#define RTL_ISR_CABLE   0x2000


#define RTL_MSR_LINK      0x04
#define RTL_MSR_SPEED100  0x08


#define RTL_RCR_AAP       0x01
#define RTL_RCR_APM       0x02
#define RTL_RCR_AB        0x08
#define RTL_RCR_WRAP      0x80
#define RTL_RCR_RBLEN     0x1800
#define RTL_RCR_MXDMA     0x0700


#define PCI_CONFIG_ADDR  0xCF8
#define PCI_CONFIG_DATA  0xCFC
#define PCI_BARO         0x10
#define PCI_CMD          0x04

#define RX_BUF_SIZE      65536
#define TX_BUF_SIZE      1536

static addr_t    rtl_base      = 0;
static uint8_t   rtl_mac[6]    = { 0 };
static uint8_t   cable_status  = 0;
static uint32_t  rx_packets    = 0;
static uint32_t  rx_errors     = 0;
static uint32_t  tx_packets    = 0;
static uint32_t  tx_error      = 0;
static uint8_t   rx_buf[RX_BUF_SIZE];
static uint8_t   tx_buf[TX_BUF_SIZE];

static uint32_t pci_read32(uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset) {
    uint32_t addr = (uint32_t)(
       ((uint32_t)bus << 16)  |
       ((uint32_t)slot << 11) |
       ((uint32_t)func << 8)  |
       (offset & 0xFC)        |
       0x80000000
);
outl(PCI_CONFIG_ADDR, addr);
return inl(PCI_CONFIG_DATA);
}

   static void pci_write32(uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset, uint32_t val) {
      uint32_t addr = (uint32_t)(
       ((uint32_t)bus << 16)  |
       ((uint32_t)slot << 11) |
       ((uint32_t)func << 8)  |
       (offset & 0xFC)        |
       0x80000000
);
outl(PCI_CONFIG_ADDR, addr);
outl(PCI_CONFIG_DATA, val);
}

static uint16_t pci_read16(uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset) {
    return (uint16_t)(pci_read32(bus, slot, func, offset) >> ((offset & 2) * 8));
}

/****************************************************
* ================================================================================
PROJECT: VALIANTCORE
AUTHOR: bigpower
COPYRIGHT (C) 2026 bigpower

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

--------------------------------------------------------------------------------
ADDITIONAL TERMS & OBLIGATIONS:

As the original author, bigpower, I explicitly mandate that any derivative work, 
modification, or distribution of VALIANTCORE must strictly adhere to the 
Copyleft provisions of the GNU General Public License v3. 

1. OPEN SOURCE MANDATE: You are encouraged to study, share, and improve 
   VALIANTCORE. However, any modification or derivative project created 
   using this source code MUST be released under the same or a compatible 
   open-source license.

2. ATTRIBUTION: Any public distribution or derivative work must retain 
   the original copyright notice (Copyright (C) 2026 bigpower) and acknowledge 
   the original authorship of this project.

3. FREEDOM OF SOFTWARE: This project is built on the philosophy of software 
   freedom. By using or modifying VALIANTCORE, you agree to respect these 
   principles, ensuring that the code remains accessible and transparent 
   to the entire developer community.
================================================================================

                      GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

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    */


static addr_t rtl_find_device() {
   for (uint16_t bus = 0; bus < 256; bus++) {
       for (uint8_t slot = 0; slot < 32; slot++) {
           uint32_t id = pci_read32(bus, slot, 0, 0);
           uint16_t vendor = id & 0xFFFF;
           uint16_t device = (id >> 16) & 0xFFFF;

           if (vendor == RTL_VENDOR_ID) {
              if (device == RTL_DEVICE_8111  ||
                  device == RTL_DEVICE_8111B ||
                  device == RTL_DEVICE_8111C) {


                  uint32_t cmd = pci_read32(bus, slot, 0, PCI_CMD);
                  pci_write32(bus, slot, 0, PCI_CMD, cmd | 0x07);

                  addr_t base = (addr_t)(pci_read32(bus, slot, 0, PCI_BARO) & ~0xF);
                  return base;
               }
            }
         }
    }
   return 0;
}

static inline uint8_t rtl_read8(uint8_t reg) {
    return inb((uint16_t)rtl_base + reg);
}

static inline uint16_t rtl_read16(uint8_t reg) {
   return inw((uint16_t)(rtl_base + reg));
}

static inline uint32_t rtl_read32(uint8_t reg) {
   return inl((uint16_t)(rtl_base + reg));
}

static inline void rtl_write8(uint8_t reg, uint8_t val) {
    outb((uint16_t)(rtl_base + reg), val);
}

static inline void rtl_write16(uint8_t reg, uint16_t val) {
    outw((uint16_t)(rtl_base + reg), val);
}

static inline void rtl_write32(uint8_t reg, uint32_t val) {
    outl((uint16_t)(rtl_base + reg), val);
}

static void rtl_io_wait() {
    for (volatile int i = 0; i < 1000; i++);
}


static void rtl_read_mac() {
   for (int i = 0; i < 6; i++)
   rtl_mac[i] = rtl_read8(RTL_MACO + i);
}


static uint8_t rtl_check_cable() {
   uint8_t msr = rtl_read8(RTL_MSR);
   return (msr & RTL_MSR_LINK) ? 1 : 0;
}


int rtl8111_init() {
   kprint("RTL8111 Scanning PCI bus...\n");

   rtl_base = rtl_find_device();
   if (!rtl_base) {
      kprint("RTL8111 ERROR Device not found!\n");
      return -1;
    }

    kprint("RTL8111 Device found! Initializing...\n");


    rtl_write8(RTL_CMD, RTL_CMD_RESET);
    int timeout = 10000;
    while ((rtl_read8(RTL_CMD) & RTL_CMD_RESET) && timeout--);
    if (timeout <= 0) {
       kprint("ERROR Reset timeout!\n");
       return -1;
    }


    rtl_read_mac();


    rtl_write32(RTL_RXBUF, (uint32_t)(addr_t)rx_buf);


    rtl_write16(RTL_IMR, RTL_ISR_ROK | RTL_ISR_TOK | RTL_ISR_CABLE);


    rtl_write32(RTL_RCR,
      RTL_RCR_APM    |
      RTL_RCR_AB     |
      RTL_RCR_WRAP   |
      RTL_RCR_RBLEN  |
      RTL_RCR_MXDMA
    );


    rtl_write32(RTL_TCR, 0x03000700);


    rtl_write8(RTL_CMD, RTL_CMD_RX_EN | RTL_CMD_TX_EN);

    rtl_write8(RTL_CONFIG1, 0x00);


    cable_status = rtl_check_cable();
    if (cable_status) {
       kprint("RTL8111 Ethernet Cable connected!\n");
   } else {
       kprint("RTL8111 WARNING: Cable disconnected!\n");
    }


    kprint("RTL8111 Driver Ready.\n");
    return 0;
 }



 int rtl8111_send(const uint8_t *data, uint16_t len) {
     if (!rtl_base) {
        kprint("RTL8111 ERROR: Driver not initialized!\n");
        return -1;
     }
     if (!cable_status) {
        kprint("RTL8111 ERROR: Cable disconnected!\n");
        return -1;
     }
     if (len > TX_BUF_SIZE) {
        kprint("RTL8111 ERROR: Packet too large!\n");
        return -1;
     }



    for (uint16_t i = 0; i < len; i++)
        tx_buf[i] = data[i];

    rtl_write32(RTL_TXADDR0, (uint32_t)(addr_t)tx_buf);
    rtl_write32(RTL_TXSTATUSO, len);

            
    int timeout = 100000;
    while (!(rtl_read32(RTL_TXSTATUSO) & 0x8000) && timeout--);
    if (timeout <= 0) {
        kprint("[RTL8111] ERROR: Transmit timeout!\n");
        return -1;
    }

    tx_packets++;
    return 0;
}


int rtl8111_receive(uint16_t *buf, uint16_t *len) {
    if (!rtl_base) return -1;


    uint16_t isr = rtl_read16(RTL_ISR);
    if (!(isr & RTL_ISR_ROK)) return 0;

    rtl_write16(RTL_ISR, RTL_ISR_ROK);


    uint16_t rx_ptr = rtl_read16(RTL_RXBUFPTR);
    uint32_t pkt_len = *((uint16_t*)(rx_buf + rx_ptr + 2));

    if (pkt_len > RX_BUF_SIZE) {
       rx_errors++;
       kprint("RTL8111 ERROR: Oversized packet!\n");
       return -1;
    }

    for (uint16_t i = 0; i < pkt_len; i++)
        buf[i] = rx_buf[rx_ptr + 4 + i];
    *len = pkt_len;
    rx_packets++;
    return 1;
}

void rtl8111_irq_handler() {
    if (!rtl_base) return;


    uint16_t isr = rtl_read16(RTL_ISR);
    rtl_write16(RTL_ISR, isr);

    if (isr & RTL_ISR_CABLE) {
        cable_status = rtl_check_cable();
        if (cable_status)
          kprint("[RTL8111] Ethernet cable connected!\n");
        else
          kprint("RTL8111 WARNING: Cable disconnected!\n");
      }

      if (isr & RTL_ISR_ROK)
         kprint("RTL8111 Packet received!\n");
      if (isr & RTL_ISR_TOK)
         tx_packets++;
}

void rtl8111_stats() {
    kprint("[RTL8111] --- Driver Stats ---\n");
    kprint("[RTL8111] RX packets OK\n");
    kprint("[RTL8111] TX packets OK\n");
}

uint8_t rtl8111_link_status() { return cable_status; }
uint32_t rtl8111_rx_count()   { return rx_packets; }
uint32_t rtl8111_tx_count()   { return tx_packets; }
