/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Ha Thach (tinyusb.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * This file is part of the TinyUSB stack.
 */

#include "tusb_option.h"

#if CFG_TUH_ENABLED || CFG_TUD_ENABLED

#include "tusb.h"
#include "common/tusb_private.h"

#if CFG_TUD_ENABLED
#include "device/usbd_pvt.h"
#endif

#if CFG_TUH_ENABLED
#include "host/usbh_pvt.h"
#endif

//--------------------------------------------------------------------+
// Public API
//--------------------------------------------------------------------+

bool tusb_init(void) {
  #if CFG_TUD_ENABLED && defined(TUD_OPT_RHPORT)
  // init device stack CFG_TUSB_RHPORTx_MODE must be defined
  TU_ASSERT ( tud_init(TUD_OPT_RHPORT) );
  #endif

  #if CFG_TUH_ENABLED && defined(TUH_OPT_RHPORT)
  // init host stack CFG_TUSB_RHPORTx_MODE must be defined
  TU_ASSERT( tuh_init(TUH_OPT_RHPORT) );
  #endif

  return true;
}

bool tusb_inited(void) {
  bool ret = false;

  #if CFG_TUD_ENABLED
  ret = ret || tud_inited();
  #endif

  #if CFG_TUH_ENABLED
  ret = ret || tuh_inited();
  #endif

  return ret;
}

//--------------------------------------------------------------------+
// Descriptor helper
//--------------------------------------------------------------------+

uint8_t const* tu_desc_find(uint8_t const* desc, uint8_t const* end, uint8_t byte1) {
  while (desc + 1 < end) {
    if (desc[1] == byte1) return desc;
    desc += desc[DESC_OFFSET_LEN];
  }
  return NULL;
}

uint8_t const* tu_desc_find2(uint8_t const* desc, uint8_t const* end, uint8_t byte1, uint8_t byte2) {
  while (desc + 2 < end) {
    if (desc[1] == byte1 && desc[2] == byte2) return desc;
    desc += desc[DESC_OFFSET_LEN];
  }
  return NULL;
}

uint8_t const* tu_desc_find3(uint8_t const* desc, uint8_t const* end, uint8_t byte1, uint8_t byte2, uint8_t byte3) {
  while (desc + 3 < end) {
    if (desc[1] == byte1 && desc[2] == byte2 && desc[3] == byte3) return desc;
    desc += desc[DESC_OFFSET_LEN];
  }
  return NULL;
}

//--------------------------------------------------------------------+
// Endpoint Helper for both Host and Device stack
//--------------------------------------------------------------------+

bool tu_edpt_claim(tu_edpt_state_t* ep_state, osal_mutex_t mutex) {
  (void) mutex;

  // pre-check to help reducing mutex lock
  TU_VERIFY((ep_state->busy == 0) && (ep_state->claimed == 0));
  (void) osal_mutex_lock(mutex, OSAL_TIMEOUT_WAIT_FOREVER);

  // can only claim the endpoint if it is not busy and not claimed yet.
  bool const available = (ep_state->busy == 0) && (ep_state->claimed == 0);
  if (available) {
    ep_state->claimed = 1;
  }

  (void) osal_mutex_unlock(mutex);
  return available;
}

bool tu_edpt_release(tu_edpt_state_t* ep_state, osal_mutex_t mutex) {
  (void) mutex;
  (void) osal_mutex_lock(mutex, OSAL_TIMEOUT_WAIT_FOREVER);

  // can only release the endpoint if it is claimed and not busy
  bool const ret = (ep_state->claimed == 1) && (ep_state->busy == 0);
  if (ret) {
    ep_state->claimed = 0;
  }

  (void) osal_mutex_unlock(mutex);
  return ret;
}

bool tu_edpt_validate(tusb_desc_endpoint_t const* desc_ep, tusb_speed_t speed) {
  uint16_t const max_packet_size = tu_edpt_packet_size(desc_ep);
  TU_LOG2("  Open EP %02X with Size = %u\r\n", desc_ep->bEndpointAddress, max_packet_size);

  switch (desc_ep->bmAttributes.xfer) {
    case TUSB_XFER_ISOCHRONOUS: {
      uint16_t const spec_size = (speed == TUSB_SPEED_HIGH ? 1024 : 1023);
      TU_ASSERT(max_packet_size <= spec_size);
      break;
    }

    case TUSB_XFER_BULK:
      if (speed == TUSB_SPEED_HIGH) {
        // Bulk highspeed must be EXACTLY 512
        TU_ASSERT(max_packet_size == 512);
      } else {
        // TODO Bulk fullspeed can only be 8, 16, 32, 64
        TU_ASSERT(max_packet_size <= 64);
      }
      break;

    case TUSB_XFER_INTERRUPT: {
      uint16_t const spec_size = (speed == TUSB_SPEED_HIGH ? 1024 : 64);
      TU_ASSERT(max_packet_size <= spec_size);
      break;
    }

    default:
      return false;
  }

  return true;
}

void tu_edpt_bind_driver(uint8_t ep2drv[][2], tusb_desc_interface_t const* desc_itf, uint16_t desc_len,
                         uint8_t driver_id) {
  uint8_t const* p_desc = (uint8_t const*) desc_itf;
  uint8_t const* desc_end = p_desc + desc_len;

  while (p_desc < desc_end) {
    if (TUSB_DESC_ENDPOINT == tu_desc_type(p_desc)) {
      uint8_t const ep_addr = ((tusb_desc_endpoint_t const*) p_desc)->bEndpointAddress;
      TU_LOG(2, "  Bind EP %02x to driver id %u\r\n", ep_addr, driver_id);
      ep2drv[tu_edpt_number(ep_addr)][tu_edpt_dir(ep_addr)] = driver_id;
    }
    p_desc = tu_desc_next(p_desc);
  }
}

uint16_t tu_desc_get_interface_total_len(tusb_desc_interface_t const* desc_itf, uint8_t itf_count, uint16_t max_len) {
  uint8_t const* p_desc = (uint8_t const*) desc_itf;
  uint16_t len = 0;

  while (itf_count--) {
    // Next on interface desc
    len += tu_desc_len(desc_itf);
    p_desc = tu_desc_next(p_desc);

    while (len < max_len) {
      // return on IAD regardless of itf count
      if (tu_desc_type(p_desc) == TUSB_DESC_INTERFACE_ASSOCIATION) {
        return len;
      }
      if ((tu_desc_type(p_desc) == TUSB_DESC_INTERFACE) &&
          ((tusb_desc_interface_t const*) p_desc)->bAlternateSetting == 0) {
        break;
      }

      len += tu_desc_len(p_desc);
      p_desc = tu_desc_next(p_desc);
    }
  }

  return len;
}

//--------------------------------------------------------------------+
// Endpoint Stream Helper for both Host and Device stack
//--------------------------------------------------------------------+

bool tu_edpt_stream_init(tu_edpt_stream_t* s, bool is_host, bool is_tx, bool overwritable,
                         void* ff_buf, uint16_t ff_bufsize, uint8_t* ep_buf, uint16_t ep_bufsize) {
  osal_mutex_t new_mutex = osal_mutex_create(&s->ff_mutexdef);
  (void) new_mutex;
  (void) is_tx;

  s->is_host = is_host;
  tu_fifo_config(&s->ff, ff_buf, ff_bufsize, 1, overwritable);
  tu_fifo_config_mutex(&s->ff, is_tx ? new_mutex : NULL, is_tx ? NULL : new_mutex);

  s->ep_buf = ep_buf;
  s->ep_bufsize = ep_bufsize;

  return true;
}

bool tu_edpt_stream_deinit(tu_edpt_stream_t* s) {
  (void) s;
  #if OSAL_MUTEX_REQUIRED
  if (s->ff.mutex_wr) osal_mutex_delete(s->ff.mutex_wr);
  if (s->ff.mutex_rd) osal_mutex_delete(s->ff.mutex_rd);
  #endif
  return true;
}

TU_ATTR_ALWAYS_INLINE static inline
bool stream_claim(tu_edpt_stream_t* s) {
  if (s->is_host) {
    #if CFG_TUH_ENABLED
    return usbh_edpt_claim(s->daddr, s->ep_addr);
    #endif
  } else {
    #if CFG_TUD_ENABLED
    return usbd_edpt_claim(s->rhport, s->ep_addr);
    #endif
  }
  return false;
}

TU_ATTR_ALWAYS_INLINE static inline
bool stream_xfer(tu_edpt_stream_t* s, uint16_t count) {
  if (s->is_host) {
    #if CFG_TUH_ENABLED
    return usbh_edpt_xfer(s->daddr, s->ep_addr, count ? s->ep_buf : NULL, count);
    #endif
  } else {
    #if CFG_TUD_ENABLED
    return usbd_edpt_xfer(s->rhport, s->ep_addr, count ? s->ep_buf : NULL, count);
    #endif
  }
  return false;
}

TU_ATTR_ALWAYS_INLINE static inline
bool stream_release(tu_edpt_stream_t* s) {
  if (s->is_host) {
    #if CFG_TUH_ENABLED
    return usbh_edpt_release(s->daddr, s->ep_addr);
    #endif
  } else {
    #if CFG_TUD_ENABLED
    return usbd_edpt_release(s->rhport, s->ep_addr);
    #endif
  }
  return false;
}

//--------------------------------------------------------------------+
// Stream Write
//--------------------------------------------------------------------+
bool tu_edpt_stream_write_zlp_if_needed(tu_edpt_stream_t* s, uint32_t last_xferred_bytes) {
  // ZLP condition: no pending data, last transferred bytes is multiple of packet size
  TU_VERIFY(!tu_fifo_count(&s->ff) && last_xferred_bytes && (0 == (last_xferred_bytes & (s->ep_packetsize - 1))));
  TU_VERIFY(stream_claim(s));
  TU_ASSERT(stream_xfer(s, 0));
  return true;
}

uint32_t tu_edpt_stream_write_xfer(tu_edpt_stream_t* s) {
  // skip if no data
  TU_VERIFY(tu_fifo_count(&s->ff), 0);

  // Claim the endpoint
  TU_VERIFY(stream_claim(s), 0);

  // Pull data from FIFO -> EP buf
  uint16_t const count = tu_fifo_read_n(&s->ff, s->ep_buf, s->ep_bufsize);

  if (count) {
    TU_ASSERT(stream_xfer(s, count), 0);
    return count;
  } else {
    // Release endpoint since we don't make any transfer
    // Note: data is dropped if terminal is not connected
    stream_release(s);
    return 0;
  }
}

uint32_t tu_edpt_stream_write(tu_edpt_stream_t* s, void const* buffer, uint32_t bufsize) {
  TU_VERIFY(bufsize); // TODO support ZLP
  uint16_t ret = tu_fifo_write_n(&s->ff, buffer, (uint16_t) bufsize);

  // flush if fifo has more than packet size or
  // in rare case: fifo depth is configured too small (which never reach packet size)
  if ((tu_fifo_count(&s->ff) >= s->ep_packetsize) || (tu_fifo_depth(&s->ff) < s->ep_packetsize)) {
    tu_edpt_stream_write_xfer(s);
  }

  return ret;
}

//--------------------------------------------------------------------+
// Stream Read
//--------------------------------------------------------------------+
uint32_t tu_edpt_stream_read_xfer(tu_edpt_stream_t* s) {
  uint16_t available = tu_fifo_remaining(&s->ff);

  // Prepare for incoming data but only allow what we can store in the ring buffer.
  // TODO Actually we can still carry out the transfer, keeping count of received bytes
  // and slowly move it to the FIFO when read().
  // This pre-check reduces endpoint claiming
  TU_VERIFY(available >= s->ep_packetsize);

  // claim endpoint
  TU_VERIFY(stream_claim(s), 0);

  // get available again since fifo can be changed before endpoint is claimed
  available = tu_fifo_remaining(&s->ff);

  if (available >= s->ep_packetsize) {
    // multiple of packet size limit by ep bufsize
    uint16_t count = (uint16_t) (available & ~(s->ep_packetsize - 1));
    count = tu_min16(count, s->ep_bufsize);

    TU_ASSERT(stream_xfer(s, count), 0);
    return count;
  } else {
    // Release endpoint since we don't make any transfer
    stream_release(s);
    return 0;
  }
}

uint32_t tu_edpt_stream_read(tu_edpt_stream_t* s, void* buffer, uint32_t bufsize) {
  uint32_t num_read = tu_fifo_read_n(&s->ff, buffer, (uint16_t) bufsize);
  tu_edpt_stream_read_xfer(s);
  return num_read;
}

//--------------------------------------------------------------------+
// Debug
//--------------------------------------------------------------------+

#if CFG_TUSB_DEBUG
#include <ctype.h>

#if CFG_TUSB_DEBUG >= CFG_TUH_LOG_LEVEL || CFG_TUSB_DEBUG >= CFG_TUD_LOG_LEVEL
char const* const tu_str_speed[] = {"Full", "Low", "High"};
char const* const tu_str_std_request[] = {
    "Get Status",
    "Clear Feature",
    "Reserved",
    "Set Feature",
    "Reserved",
    "Set Address",
    "Get Descriptor",
    "Set Descriptor",
    "Get Configuration",
    "Set Configuration",
    "Get Interface",
    "Set Interface",
    "Synch Frame"
};

char const* const tu_str_xfer_result[] = {
    "OK", "FAILED", "STALLED", "TIMEOUT"
};
#endif

static void dump_str_line(uint8_t const* buf, uint16_t count) {
  tu_printf("  |");
  // each line is 16 bytes
  for (uint16_t i = 0; i < count; i++) {
    const char ch = buf[i];
    tu_printf("%c", isprint(ch) ? ch : '.');
  }
  tu_printf("|\r\n");
}

/* Print out memory contents
 *  - buf   : buffer
 *  - count : number of item
 *  - indent: prefix spaces on every line
 */
void tu_print_mem(void const* buf, uint32_t count, uint8_t indent) {
  uint8_t const size = 1; // fixed 1 byte for now
  if (!buf || !count) {
    tu_printf("NULL\r\n");
    return;
  }

  uint8_t const* buf8 = (uint8_t const*) buf;
  char format[] = "%00X";
  format[2] += (uint8_t) (2 * size); // 1 byte = 2 hex digits
  const uint8_t item_per_line = 16 / size;

  for (unsigned int i = 0; i < count; i++) {
    unsigned int value = 0;

    if (i % item_per_line == 0) {
      // Print Ascii
      if (i != 0) dump_str_line(buf8 - 16, 16);
      for (uint8_t s = 0; s < indent; s++) tu_printf(" ");
      // print offset or absolute address
      tu_printf("%04X: ", 16 * i / item_per_line);
    }

    tu_memcpy_s(&value, sizeof(value), buf8, size);
    buf8 += size;

    tu_printf(" ");
    tu_printf(format, value);
  }

  // fill up last row to 16 for printing ascii
  const uint32_t remain = count % 16;
  uint8_t nback = (uint8_t) (remain ? remain : 16);
  if (remain) {
    for (uint32_t i = 0; i < 16 - remain; i++) {
      tu_printf(" ");
      for (int j = 0; j < 2 * size; j++) tu_printf(" ");
    }
  }

  dump_str_line(buf8 - nback, nback);
}

#endif

#endif // host or device enabled