//
// Copyright (C) 2025 The Khronos Group Inc.
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//
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//    notice, this list of conditions and the following disclaimer.
//
//    Redistributions in binary form must reproduce the above
//    copyright notice, this list of conditions and the following
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//    with the distribution.
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#include <stdint.h>
#include <stdio.h>

#include <glslang/Include/glslang_c_interface.h>

// Required for use of glslang_default_resource
#include <glslang/Public/resource_limits_c.h>

typedef struct SpirVBinary {
    uint32_t* words; // SPIR-V words
    int size;        // number of words in SPIR-V binary
} SpirVBinary;

SpirVBinary compileShaderToSPIRV_Vulkan(glslang_stage_t stage, const char* shaderSource, const char* fileName)
{
    const glslang_input_t input = {
        .language = GLSLANG_SOURCE_GLSL,
        .stage = stage,
        .client = GLSLANG_CLIENT_VULKAN,
        .client_version = GLSLANG_TARGET_VULKAN_1_2,
        .target_language = GLSLANG_TARGET_SPV,
        .target_language_version = GLSLANG_TARGET_SPV_1_5,
        .code = shaderSource,
        .default_version = 100,
        .default_profile = GLSLANG_NO_PROFILE,
        .force_default_version_and_profile = false,
        .forward_compatible = false,
        .messages = GLSLANG_MSG_DEFAULT_BIT,
        .resource = glslang_default_resource(),
    };

    glslang_shader_t* shader = glslang_shader_create(&input);

    SpirVBinary bin = {
        .words = NULL,
        .size = 0,
    };
    if (!glslang_shader_preprocess(shader, &input)) {
        printf("GLSL preprocessing failed %s\n", fileName);
        printf("%s\n", glslang_shader_get_info_log(shader));
        printf("%s\n", glslang_shader_get_info_debug_log(shader));
        printf("%s\n", input.code);
        glslang_shader_delete(shader);
        return bin;
    }

    if (!glslang_shader_parse(shader, &input)) {
        printf("GLSL parsing failed %s\n", fileName);
        printf("%s\n", glslang_shader_get_info_log(shader));
        printf("%s\n", glslang_shader_get_info_debug_log(shader));
        printf("%s\n", glslang_shader_get_preprocessed_code(shader));
        glslang_shader_delete(shader);
        return bin;
    }

    glslang_program_t* program = glslang_program_create();
    glslang_program_add_shader(program, shader);

    if (!glslang_program_link(program, GLSLANG_MSG_SPV_RULES_BIT | GLSLANG_MSG_VULKAN_RULES_BIT)) {
        printf("GLSL linking failed %s\n", fileName);
        printf("%s\n", glslang_program_get_info_log(program));
        printf("%s\n", glslang_program_get_info_debug_log(program));
        glslang_program_delete(program);
        glslang_shader_delete(shader);
        return bin;
    }

    glslang_program_SPIRV_generate(program, stage);

    bin.size = glslang_program_SPIRV_get_size(program);
    bin.words = malloc(bin.size * sizeof(uint32_t));
    glslang_program_SPIRV_get(program, bin.words);

    const char* spirv_messages = glslang_program_SPIRV_get_messages(program);
    if (spirv_messages)
        printf("(%s) %s\b", fileName, spirv_messages);

    glslang_program_delete(program);
    glslang_shader_delete(shader);

    return bin;
}

int main() { return 0; }