#include "TextLoader.h"
#include <stdint.h>

/** Create a TextLoader. */
TextLoader::TextLoader()
{
    m_line_endings = LINE_ENDING_LF;
    m_lines = NULL;
    m_eol_at_eof = true;
}

/**
 * Scan text to detect line endings and record their positions.
 *
 * @param buffer Buffer containing the text to import.
 * @param size Size of the buffer.
 */
void TextLoader::load_buffer(uint8_t * buffer, size_t size)
{
    LineIndexPairListRef lines[LINE_ENDING_COUNT];
    size_t line_start[LINE_ENDING_COUNT] = {0};
    unsigned int n_cr = 0;
    unsigned int n_lf = 0;
    bool crlf = true;
    for (size_t i = 0; i < LINE_ENDING_COUNT; i++)
    {
        lines[i] = std::make_shared<LineIndexPairList>();
    }
    for (size_t i = 0; i < size; i++)
    {
        if (buffer[i] == '\r')
        {
            lines[LINE_ENDING_CR]->push_back(LineIndexPair(&buffer[line_start[LINE_ENDING_CR]], i - line_start[LINE_ENDING_CR]));
            n_cr++;
            line_start[LINE_ENDING_CR] = i + 1;
            if (crlf)
            {
                if ((i < (size - 1)) && (buffer[i + 1] == '\n'))
                {
                    lines[LINE_ENDING_CRLF]->push_back(LineIndexPair(&buffer[line_start[LINE_ENDING_CRLF]], i - line_start[LINE_ENDING_CRLF]));
                    n_lf++;
                    i++;
                    line_start[LINE_ENDING_CRLF] = i + 1;
                }
                else
                {
                    crlf = false;
                }
            }
        }
        else if (buffer[i] == '\n')
        {
            lines[LINE_ENDING_LF]->push_back(LineIndexPair(&buffer[line_start[LINE_ENDING_LF]], i - line_start[LINE_ENDING_LF]));
            crlf = false;
            n_lf++;
            line_start[LINE_ENDING_LF] = i + 1;
        }
    }

    if (crlf && (n_lf > 0u))
    {
        m_line_endings = LINE_ENDING_CRLF;
        m_lines = lines[LINE_ENDING_CRLF];
    }
    else if ((n_cr > 0u) && (n_lf == 0u))
    {
        m_line_endings = LINE_ENDING_CR;
        m_lines = lines[LINE_ENDING_CR];
    }
    else
    {
        m_line_endings = LINE_ENDING_LF;
        m_lines = lines[LINE_ENDING_LF];
    }
}