/*
  Copyright 2019-2021 David Robillard <d@drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include "read_utils.h"
#include "write_utils.h"

#include "exess/exess.h"

#include <stdbool.h>
#include <stdint.h>
#include <string.h>

// Constructors

ExessVariant
exess_make_nothing(const ExessStatus status)
{
  ExessVariant v = {EXESS_NOTHING, .value.as_status = status};
  return v;
}

ExessVariant
exess_make_boolean(const bool value)
{
  ExessVariant v = {EXESS_BOOLEAN, .value.as_bool = value};
  return v;
}

ExessVariant
exess_make_decimal(const double value)
{
  ExessVariant v = {EXESS_DECIMAL, .value.as_double = value};
  return v;
}

ExessVariant
exess_make_double(const double value)
{
  ExessVariant v = {EXESS_DOUBLE, .value.as_double = value};
  return v;
}

ExessVariant
exess_make_float(const float value)
{
  ExessVariant v = {EXESS_FLOAT, .value.as_float = value};
  return v;
}

ExessVariant
exess_make_long(const int64_t value)
{
  ExessVariant v = {EXESS_LONG, .value.as_long = value};
  return v;
}

ExessVariant
exess_make_int(const int32_t value)
{
  ExessVariant v = {EXESS_INT, .value.as_int = value};
  return v;
}

ExessVariant
exess_make_short(const int16_t value)
{
  ExessVariant v = {EXESS_SHORT, .value.as_short = value};
  return v;
}

ExessVariant
exess_make_byte(const int8_t value)
{
  ExessVariant v = {EXESS_BYTE, .value.as_byte = value};
  return v;
}

ExessVariant
exess_make_ulong(const uint64_t value)
{
  ExessVariant v = {EXESS_ULONG, .value.as_ulong = value};
  return v;
}

ExessVariant
exess_make_uint(const uint32_t value)
{
  ExessVariant v = {EXESS_UINT, .value.as_uint = value};
  return v;
}

ExessVariant
exess_make_ushort(const uint16_t value)
{
  ExessVariant v = {EXESS_USHORT, .value.as_ushort = value};
  return v;
}

ExessVariant
exess_make_ubyte(const uint8_t value)
{
  ExessVariant v = {EXESS_UBYTE, .value.as_ubyte = value};
  return v;
}

ExessVariant
exess_make_duration(const ExessDuration value)
{
  ExessVariant v = {EXESS_DURATION, .value.as_duration = value};
  return v;
}

ExessVariant
exess_make_datetime(const ExessDateTime value)
{
  ExessVariant v = {EXESS_DATETIME, .value.as_datetime = value};
  return v;
}

ExessVariant
exess_make_time(const ExessTime value)
{
  ExessVariant v = {EXESS_TIME, .value.as_time = value};
  return v;
}

ExessVariant
exess_make_date(const ExessDate value)
{
  ExessVariant v = {EXESS_DATE, .value.as_date = value};
  return v;
}

ExessVariant
exess_make_hex(const ExessBlob blob)
{
  ExessVariant v = {EXESS_HEX, .value.as_blob = blob};
  return v;
}

ExessVariant
exess_make_base64(const ExessBlob blob)
{
  ExessVariant v = {EXESS_BASE64, .value.as_blob = blob};
  return v;
}

// Accessors

ExessStatus
exess_get_status(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_NOTHING ? variant->value.as_status
                                            : EXESS_SUCCESS;
}
const bool*
exess_get_boolean(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_BOOLEAN ? &variant->value.as_bool : NULL;
}

const double*
exess_get_double(const ExessVariant* const variant)
{
  return (variant->datatype == EXESS_DECIMAL ||
          variant->datatype == EXESS_DOUBLE)
           ? &variant->value.as_double
           : NULL;
}

const float*
exess_get_float(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_FLOAT ? &variant->value.as_float : NULL;
}

const int64_t*
exess_get_long(const ExessVariant* const variant)
{
  return (variant->datatype >= EXESS_INTEGER && variant->datatype <= EXESS_LONG)
           ? &variant->value.as_long
           : NULL;
}

const int32_t*
exess_get_int(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_INT ? &variant->value.as_int : NULL;
}

const int16_t*
exess_get_short(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_SHORT ? &variant->value.as_short : NULL;
}

const int8_t*
exess_get_byte(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_BYTE ? &variant->value.as_byte : NULL;
}

const uint64_t*
exess_get_ulong(const ExessVariant* const variant)
{
  return (variant->datatype == EXESS_NON_NEGATIVE_INTEGER ||
          variant->datatype == EXESS_ULONG ||
          variant->datatype == EXESS_POSITIVE_INTEGER)
           ? &variant->value.as_ulong
           : NULL;
}

const uint32_t*
exess_get_uint(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_UINT ? &variant->value.as_uint : NULL;
}

const uint16_t*
exess_get_ushort(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_USHORT ? &variant->value.as_ushort : NULL;
}

const uint8_t*
exess_get_ubyte(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_UBYTE ? &variant->value.as_ubyte : NULL;
}

const ExessBlob*
exess_get_blob(const ExessVariant* const variant)
{
  return (variant->datatype == EXESS_HEX || variant->datatype == EXESS_BASE64)
           ? &variant->value.as_blob
           : NULL;
}

const ExessDuration*
exess_get_duration(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_DURATION ? &variant->value.as_duration
                                             : NULL;
}

const ExessDateTime*
exess_get_datetime(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_DATETIME ? &variant->value.as_datetime
                                             : NULL;
}

const ExessTime*
exess_get_time(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_TIME ? &variant->value.as_time : NULL;
}

const ExessDate*
exess_get_date(const ExessVariant* const variant)
{
  return variant->datatype == EXESS_DATE ? &variant->value.as_date : NULL;
}

// Reading and Writing

ExessResult
exess_read_variant(ExessVariant* const out,
                   ExessDatatype       datatype,
                   const char* const   str)
{
  ExessResult r = {EXESS_UNSUPPORTED, 0};

  out->datatype = datatype;

  switch (datatype) {
  case EXESS_NOTHING:
    break;
  case EXESS_BOOLEAN:
    return exess_read_boolean(&out->value.as_bool, str);
  case EXESS_DECIMAL:
    return exess_read_decimal(&out->value.as_double, str);
  case EXESS_DOUBLE:
    return exess_read_double(&out->value.as_double, str);
  case EXESS_FLOAT:
    return exess_read_float(&out->value.as_float, str);
  case EXESS_INTEGER:
    return exess_read_long(&out->value.as_long, str);

  case EXESS_NON_POSITIVE_INTEGER:
    if (!(r = exess_read_long(&out->value.as_long, str)).status) {
      if (out->value.as_long > 0) {
        return result(EXESS_OUT_OF_RANGE, r.count);
      }
    }
    break;

  case EXESS_NEGATIVE_INTEGER:
    if (!(r = exess_read_long(&out->value.as_long, str)).status) {
      if (out->value.as_long >= 0) {
        return result(EXESS_OUT_OF_RANGE, r.count);
      }
    }
    break;

  case EXESS_LONG:
    return exess_read_long(&out->value.as_long, str);
  case EXESS_INT:
    return exess_read_int(&out->value.as_int, str);
  case EXESS_SHORT:
    return exess_read_short(&out->value.as_short, str);
  case EXESS_BYTE:
    return exess_read_byte(&out->value.as_byte, str);
  case EXESS_NON_NEGATIVE_INTEGER:
  case EXESS_ULONG:
    return exess_read_ulong(&out->value.as_ulong, str);
  case EXESS_UINT:
    return exess_read_uint(&out->value.as_uint, str);
  case EXESS_USHORT:
    return exess_read_ushort(&out->value.as_ushort, str);
  case EXESS_UBYTE:
    return exess_read_ubyte(&out->value.as_ubyte, str);

  case EXESS_POSITIVE_INTEGER:
    if (!(r = exess_read_ulong(&out->value.as_ulong, str)).status) {
      if (out->value.as_ulong <= 0) {
        return result(EXESS_OUT_OF_RANGE, r.count);
      }
    }
    break;

  case EXESS_DURATION:
    return exess_read_duration(&out->value.as_duration, str);
  case EXESS_DATETIME:
    return exess_read_datetime(&out->value.as_datetime, str);
  case EXESS_TIME:
    return exess_read_time(&out->value.as_time, str);
  case EXESS_DATE:
    return exess_read_date(&out->value.as_date, str);
  case EXESS_HEX:
    return exess_read_hex(&out->value.as_blob, str);
  case EXESS_BASE64:
    return exess_read_base64(&out->value.as_blob, str);
  }

  return r;
}

ExessResult
exess_write_variant(const ExessVariant variant,
                    const size_t       buf_size,
                    char* const        buf)
{
  if (buf_size > 0) {
    buf[0] = '\0';
  }

  switch (variant.datatype) {
  case EXESS_NOTHING:
    break;
  case EXESS_BOOLEAN:
    return exess_write_boolean(variant.value.as_bool, buf_size, buf);
  case EXESS_DECIMAL:
    return exess_write_decimal(variant.value.as_double, buf_size, buf);
  case EXESS_DOUBLE:
    return exess_write_double(variant.value.as_double, buf_size, buf);
  case EXESS_FLOAT:
    return exess_write_float(variant.value.as_float, buf_size, buf);
  case EXESS_INTEGER:
  case EXESS_NON_POSITIVE_INTEGER:
  case EXESS_NEGATIVE_INTEGER:
  case EXESS_LONG:
    return exess_write_long(variant.value.as_long, buf_size, buf);
  case EXESS_INT:
    return exess_write_int(variant.value.as_int, buf_size, buf);
  case EXESS_SHORT:
    return exess_write_short(variant.value.as_short, buf_size, buf);
  case EXESS_BYTE:
    return exess_write_byte(variant.value.as_byte, buf_size, buf);
  case EXESS_NON_NEGATIVE_INTEGER:
  case EXESS_ULONG:
    return exess_write_ulong(variant.value.as_ulong, buf_size, buf);
  case EXESS_UINT:
    return exess_write_uint(variant.value.as_uint, buf_size, buf);
  case EXESS_USHORT:
    return exess_write_ushort(variant.value.as_ushort, buf_size, buf);
  case EXESS_UBYTE:
    return exess_write_ubyte(variant.value.as_ubyte, buf_size, buf);
  case EXESS_POSITIVE_INTEGER:
    return exess_write_ulong(variant.value.as_ulong, buf_size, buf);
  case EXESS_DURATION:
    return exess_write_duration(variant.value.as_duration, buf_size, buf);
  case EXESS_DATETIME:
    return exess_write_datetime(variant.value.as_datetime, buf_size, buf);
  case EXESS_TIME:
    return exess_write_time(variant.value.as_time, buf_size, buf);
  case EXESS_DATE:
    return exess_write_date(variant.value.as_date, buf_size, buf);
  case EXESS_HEX:
    if (variant.value.as_blob.data) {
      return exess_write_hex(variant.value.as_blob.size,
                             (void*)variant.value.as_blob.data,
                             buf_size,
                             buf);
    }
    break;
  case EXESS_BASE64:
    if (variant.value.as_blob.data) {
      return exess_write_base64(variant.value.as_blob.size,
                                (void*)variant.value.as_blob.data,
                                buf_size,
                                buf);
    }
    break;
  }

  return end_write(EXESS_BAD_VALUE, buf_size, buf, 0);
}