#include "commons/commons_bdf.h"

#include <cstdint>

#include "commons/commons_hex.h"
#include "commons/commons_base.h"
#include "commons/commons_region_alloc.h"
#include "commons/commons_stringparser.h"

namespace BdfParser {

auto API NextGlyph(bdf_parser& self, region_alloc& alloc, bdf_glyph& out) -> bool
{
    auto allocMark = alloc.at;

    for (;;) {
        RegionAlloc_Reset(alloc, allocMark);

        if (ByteParser_StartsWith(self, "ENDFONT"_s))
            return false;

        if (!ByteParser_StartsWithAdvance(self, "ENCODING "_s)) {
            ByteParser_NextLine(self);
            continue;
        }

        out.encoding = CastU32(StringParser_ParseLong(self));
        ByteParser_NextLine(self);

        ASSERT(ByteParser_StartsWithAdvance(self, "SWIDTH "_s));
        ByteParser_NextLine(self);

        ASSERT(ByteParser_StartsWithAdvance(self, "DWIDTH "_s));
        for (uint32_t i = 0; i < 2; ++i) {
            out.dwidth[i] = CastI32(StringParser_ParseLong(self));
            if (i != 1)
                ASSERT(ByteParser_Read(self) == ' ');
        }
        ByteParser_NextLine(self);

        ASSERT(ByteParser_StartsWithAdvance(self, "BBX "_s));
        for (uint32_t i = 0; i < 4; ++i) {
            int64_t l = StringParser_ParseLong(self);
            out.bbx[i] = CastI32(l);
            if (i != 3)
                ASSERT(ByteParser_Read(self) == ' ');
        }
        ByteParser_NextLine(self);

        ASSERT(ByteParser_StartsWithAdvance(self, "BITMAP"_s));
        ByteParser_NextLine(self);

        span<uint8_t> data = RegionAlloc_AllocArray<uint8_t>(alloc, 32ULL * 2ULL);
        uint32_t i = 0;

        uint32_t count = 0;
        while (!ByteParser_StartsWith(self, "ENDCHAR"_s)) {
            uint8_t ch1 = ByteParser_Read(self);
            uint8_t ch2 = ByteParser_Read(self);
            data[i++] = ParseHexByte(ch1, ch2);
            ++count;

            ch1 = ByteParser_Read(self);
            ch2 = ByteParser_Read(self);
            data[i++] = ParseHexByte(ch1, ch2);
            ++count;

            ByteParser_NextLine(self);
        }

        out.bitmap = data;

        return true;
    }
}

} // namespace BdfParser