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#include "src/tint/lang/spirv/validate/validate.h"

#include <memory>
#include <span>
#include <string>
#include <utility>

#include "spirv-tools/libspirv.hpp"
#include "src/tint/utils/diagnostic/diagnostic.h"

namespace tint::spirv::validate {

Result<SuccessType> Validate(std::span<const uint32_t> spirv, spv_target_env target_env) {
    Vector<diag::Diagnostic, 4> diags;
    diags.Push(diag::Diagnostic{});  // Filled in on error

    spvtools::SpirvTools tools(target_env);
    tools.SetMessageConsumer(
        [&](spv_message_level_t level, const char*, const spv_position_t& pos, const char* msg) {
            diag::Diagnostic diag;
            diag.message = msg;
            diag.source.range.begin.line = static_cast<uint32_t>(pos.line) + 1;
            diag.source.range.begin.column = static_cast<uint32_t>(pos.column) + 1;
            diag.source.range.end = diag.source.range.begin;
            switch (level) {
                case SPV_MSG_FATAL:
                case SPV_MSG_INTERNAL_ERROR:
                case SPV_MSG_ERROR:
                    diag.severity = diag::Severity::Error;
                    break;
                case SPV_MSG_WARNING:
                    diag.severity = diag::Severity::Warning;
                    break;
                case SPV_MSG_INFO:
                case SPV_MSG_DEBUG:
                    diag.severity = diag::Severity::Note;
                    break;
            }
            diags.Push(std::move(diag));
        });

    // Don't prepare to emit friendly names. The preparation costs
    // time by scanning the whole module and building a string table.
    spvtools::ValidatorOptions val_opts;
    val_opts.SetFriendlyNames(false);

    if (tools.Validate(spirv.data(), spirv.size(), val_opts)) {
        return Success;
    }

    std::string disassembly;
    if (tools.Disassemble(
            spirv.data(), spirv.size(), &disassembly,
            SPV_BINARY_TO_TEXT_OPTION_INDENT | SPV_BINARY_TO_TEXT_OPTION_FRIENDLY_NAMES)) {
        diag::Diagnostic& err = diags.Front();
        err.message = "SPIR-V failed validation.\n\nDisassembly:\n" + std::move(disassembly);
        err.severity = diag::Severity::Error;
    } else {
        diag::Diagnostic& err = diags.Front();
        err.message = "SPIR-V failed validation and disassembly\n";
        err.severity = diag::Severity::Error;
    }
    auto file = std::make_shared<Source::File>("spirv", disassembly);
    for (auto& diag : diags) {
        diag.source.file = file.get();
        diag.owned_file = file;
    }
    auto list = diag::List(diags);
    return Failure{list.Str()};
}

}  // namespace tint::spirv::validate