#include "texture_set.h"

#include "m2_tokvec.h"

#include <cstdio>
#include <cstdlib>

namespace fmt {

bool parse_texture_set(const std::string& text, TextureSet& out, std::string* err) {
    TokVecMap tv;
    std::string perr;
    parse_tokvec(text, tv, &perr);

    out = TextureSet{};

    if (!tv.has("textureset")) {
        if (err) *err = "textureset 缺首行 `TextureSet`";
        return false;
    }
    if (!tv.has("texturecount")) {
        if (err) *err = "textureset 缺 TextureCount";
        return false;
    }
    out.declared_count = (int)tv.inum("texturecount");
    if (out.declared_count < 0) {
        if (err) *err = "textureset TextureCount 非法";
        return false;
    }

    for (int i = 1; i <= out.declared_count; ++i) {
        char key[32];
        std::snprintf(key, sizeof(key), "texture%03d", i);
        const auto* v = tv.find(key);
        if (!v) {
            if (err) *err = std::string("textureset 缺块 ") + key;
            return false;
        }
        if (v->size() < 8) {
            if (err) *err = std::string("textureset 块 ") + key + " token 不足 8 个";
            return false;
        }
        TextureLayer L;
        L.texture = (*v)[0];
        L.u_scale = (float)std::atof((*v)[1].c_str());
        L.v_scale = (float)std::atof((*v)[2].c_str());
        L.u_offset = (float)std::atof((*v)[3].c_str());
        L.v_offset = (float)std::atof((*v)[4].c_str());
        L.splat_enabled = std::atoi((*v)[5].c_str()) != 0;
        L.height_begin = (unsigned short)std::atoi((*v)[6].c_str());
        L.height_end = (unsigned short)std::atoi((*v)[7].c_str());
        out.layers.push_back(std::move(L));
    }
    return true;
}

bool parse_texture_set_file(const std::string& path, TextureSet& out, std::string* err) {
    std::string text;
    if (!read_file(path, text)) {
        if (err) *err = "打不开 " + path;
        return false;
    }
    return parse_texture_set(text, out, err);
}

} // namespace fmt