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#include "src/tint/lang/wgsl/reader/reader.h"

#include <limits>
#include <utility>

#include "src/tint/lang/wgsl/ast/module.h"
#include "src/tint/lang/wgsl/ir/atomic_vec2u_to_from_u64.h"
#include "src/tint/lang/wgsl/reader/lower/lower.h"
#include "src/tint/lang/wgsl/reader/parser/parser.h"
#include "src/tint/lang/wgsl/reader/program_to_ir/program_to_ir.h"
#include "src/tint/lang/wgsl/resolver/resolve.h"

namespace tint::wgsl::reader {

Program Parse(const Source::File* file, const Options& options) {
    if (DAWN_UNLIKELY(file->content.data.size() >
                      static_cast<size_t>(std::numeric_limits<uint32_t>::max()))) {
        ProgramBuilder b;
        b.Diagnostics().AddError(tint::Source{}) << "WGSL source must be 0xffffffff bytes or fewer";
        return Program(std::move(b));
    }
    Parser parser(file);
    parser.Parse();
    return resolver::Resolve(parser.builder(), options.allowed_features);
}

Result<core::ir::Module> WgslToIR(const Source::File* file, const Options& options) {
    Program program = Parse(file, options);
    return ProgramToLoweredIR(program);
}

Result<core::ir::Module> ProgramToLoweredIR(const Program& program, const IROptions& options) {
    TINT_CHECK_RESULT_UNWRAP(ir, ProgramToIR(program));
    ir.ice_callback = options.ice_callback;
    ir.dump_ir_when_validating = options.dump_ir_when_validating;
    ir.enable_validation_asserts = options.enable_validation_asserts;

    bool atomic_vec2u_min_max = false;
    for (auto* enable : program.AST().Enables()) {
        if (enable->HasExtension(wgsl::Extension::kAtomicVec2UMinMax)) {
            atomic_vec2u_min_max = true;
            break;
        }
    }

    if (atomic_vec2u_min_max) {
        auto res2 = tint::wgsl::ir::transform::AtomicVec2uToFromU64(
            ir, tint::wgsl::ir::transform::AtomicVec2uU64Direction::kToU64);
        if (res2 != Success) {
            return res2.Failure();
        }
    }
    // Lower from WGSL-dialect to core-dialect
    TINT_CHECK_RESULT(Lower(ir));

    return ir;
}

bool IsUnsupportedByIR(const ast::Enable* enable) {
    for (auto ext : enable->extensions) {
        switch (ext->name) {
            case tint::wgsl::Extension::kChromiumExperimentalFramebufferFetch:
                return true;
            default:
                break;
        }
    }
    return false;
}

}  // namespace tint::wgsl::reader