#include "ShaderAuthoringParser.h"

#include "Internal/ShaderAuthoringInternal.h"

namespace XCEngine {
namespace Resources {

ShaderAuthoringStyle DetectShaderAuthoringStyle(const std::string& sourceText) {
    std::vector<std::string> lines;
    Internal::SplitShaderAuthoringLines(sourceText, lines);
    if (lines.empty() || !Internal::StartsWithKeyword(lines.front(), "Shader")) {
        return ShaderAuthoringStyle::NotShaderAuthoring;
    }

    const bool hasBackendPragma = Internal::ContainsBackendPragma(lines);
    const bool hasSingleSourceConstructs = Internal::ContainsSingleSourceAuthoringConstructs(lines);

    if (hasBackendPragma && !hasSingleSourceConstructs) {
        return ShaderAuthoringStyle::LegacyBackendSplit;
    }

    if (Internal::ContainsResourcesBlock(lines) || hasSingleSourceConstructs) {
        return ShaderAuthoringStyle::UnityStyleSingleSource;
    }

    return ShaderAuthoringStyle::UnityStyleSingleSource;
}

void AppendAuthoringSourceBlock(
    Containers::String& target,
    const Containers::String& sourceBlock) {
    Internal::AppendAuthoringSourceBlock(target, sourceBlock);
}

void CollectQuotedIncludeDependencyPaths(
    const Containers::String& sourcePath,
    const Containers::String& sourceText,
    std::unordered_set<std::string>& seenPaths,
    Containers::Array<Containers::String>& outDependencies) {
    Internal::CollectQuotedIncludeDependencyPaths(sourcePath, sourceText, seenPaths, outDependencies);
}

Containers::String StripUnityStyleAuthoringPragmas(const Containers::String& sourceText) {
    return Internal::StripUnityStyleAuthoringPragmas(sourceText);
}

std::vector<ShaderKeywordSet> BuildShaderKeywordVariantSets(
    const Containers::Array<ShaderKeywordDeclaration>& declarations) {
    return Internal::BuildShaderKeywordVariantSets(declarations);
}

Containers::String BuildKeywordVariantSource(
    const Containers::String& baseSource,
    const ShaderKeywordSet& requiredKeywords) {
    return Internal::BuildKeywordVariantSource(baseSource, requiredKeywords);
}

bool ParseLegacyBackendSplitShaderAuthoring(
    const Containers::String& path,
    const std::string& sourceText,
    ShaderIR& outDesc,
    Containers::String* outError) {
    return Internal::ParseLegacyBackendSplitShaderAuthoring(path, sourceText, outDesc, outError);
}

bool ParseUnityStyleSingleSourceShaderAuthoring(
    const Containers::String& path,
    const std::string& sourceText,
    ShaderIR& outDesc,
    Containers::String* outError) {
    return Internal::ParseUnityStyleSingleSourceShaderAuthoring(path, sourceText, outDesc, outError);
}

} // namespace Resources
} // namespace XCEngine