#pragma once

#include <array>
#include <cstdint>

#include "log.h"
#include "renderer_gl/opengl_capabilities.h"

namespace pp::legacy::ui_gl {

inline void enable_opengl_state(std::uint32_t state) noexcept
{
    glEnable(static_cast<GLenum>(state));
}

inline std::uint8_t is_opengl_state_enabled(std::uint32_t state) noexcept
{
    return static_cast<std::uint8_t>(glIsEnabled(static_cast<GLenum>(state)));
}

inline void disable_opengl_state(std::uint32_t state) noexcept
{
    glDisable(static_cast<GLenum>(state));
}

inline void activate_opengl_texture(std::uint32_t texture_unit) noexcept
{
    glActiveTexture(static_cast<GLenum>(texture_unit));
}

inline void clear_opengl_buffer(std::uint32_t mask) noexcept
{
    glClear(static_cast<GLbitfield>(mask));
}

inline void set_opengl_color_mask(std::uint8_t r, std::uint8_t g, std::uint8_t b, std::uint8_t a) noexcept
{
    glColorMask(r, g, b, a);
}

inline void get_opengl_boolean(std::uint32_t name, std::uint8_t* value) noexcept
{
    glGetBooleanv(static_cast<GLenum>(name), reinterpret_cast<GLboolean*>(value));
}

inline void set_opengl_clear_color(float r, float g, float b, float a) noexcept
{
    glClearColor(r, g, b, a);
}

inline void set_opengl_blend_func(std::uint32_t source_factor, std::uint32_t destination_factor) noexcept
{
    glBlendFunc(static_cast<GLenum>(source_factor), static_cast<GLenum>(destination_factor));
}

inline void set_opengl_blend_equation(std::uint32_t equation) noexcept
{
    glBlendEquation(static_cast<GLenum>(equation));
}

inline void set_opengl_blend_equation_separate(std::uint32_t color_equation, std::uint32_t alpha_equation) noexcept
{
    glBlendEquationSeparate(static_cast<GLenum>(color_equation), static_cast<GLenum>(alpha_equation));
}

inline void set_opengl_viewport(std::int32_t x, std::int32_t y, std::int32_t width, std::int32_t height) noexcept
{
    glViewport(static_cast<GLint>(x), static_cast<GLint>(y), static_cast<GLsizei>(width), static_cast<GLsizei>(height));
}

inline void set_opengl_scissor(std::int32_t x, std::int32_t y, std::int32_t width, std::int32_t height) noexcept
{
    glScissor(static_cast<GLint>(x), static_cast<GLint>(y), static_cast<GLsizei>(width), static_cast<GLsizei>(height));
}

inline void bind_opengl_texture(std::uint32_t target, std::uint32_t texture) noexcept
{
    glBindTexture(static_cast<GLenum>(target), static_cast<GLuint>(texture));
}

inline void bind_opengl_framebuffer(std::uint32_t target, std::uint32_t framebuffer) noexcept
{
    glBindFramebuffer(static_cast<GLenum>(target), static_cast<GLuint>(framebuffer));
}

inline void read_opengl_pixels(
    std::int32_t x,
    std::int32_t y,
    std::int32_t width,
    std::int32_t height,
    std::uint32_t pixel_format,
    std::uint32_t component_type,
    void* pixels) noexcept
{
    glReadPixels(
        static_cast<GLint>(x),
        static_cast<GLint>(y),
        static_cast<GLsizei>(width),
        static_cast<GLsizei>(height),
        static_cast<GLenum>(pixel_format),
        static_cast<GLenum>(component_type),
        pixels);
}

inline void get_opengl_integer_scalar(std::uint32_t name, std::int32_t* value) noexcept
{
    GLint raw_value = 0;
    glGetIntegerv(static_cast<GLenum>(name), &raw_value);
    *value = static_cast<std::int32_t>(raw_value);
}

inline void get_opengl_integer(std::uint32_t name, std::int32_t* values) noexcept
{
    GLint raw_values[4] {};
    glGetIntegerv(static_cast<GLenum>(name), raw_values);
    values[0] = static_cast<std::int32_t>(raw_values[0]);
    values[1] = static_cast<std::int32_t>(raw_values[1]);
    values[2] = static_cast<std::int32_t>(raw_values[2]);
    values[3] = static_cast<std::int32_t>(raw_values[3]);
}

inline void get_opengl_float(std::uint32_t name, float* values) noexcept
{
    glGetFloatv(static_cast<GLenum>(name), values);
}

inline std::array<std::int32_t, 4> query_viewport(const char* context)
{
    std::array<std::int32_t, 4> viewport {};
    get_opengl_integer(pp::renderer::gl::viewport_query(), viewport.data());
    (void)context;
    return viewport;
}

inline pp::renderer::gl::OpenGlViewportRect query_viewport_rect(const char* context)
{
    const auto result = pp::renderer::gl::query_opengl_viewport(
        pp::renderer::gl::OpenGlViewportQueryDispatch {
            .get_integer = get_opengl_integer,
        });
    if (!result.ok())
        LOG("%s viewport query dispatch failed because: %s", context, result.status().message);
    return result.value();
}

inline std::array<float, 4> query_clear_color(const char* context)
{
    std::array<float, 4> color {};
    get_opengl_float(pp::renderer::gl::color_clear_value_query(), color.data());
    (void)context;
    return color;
}

inline bool query_capability(std::uint32_t state, const char* context)
{
    const auto result = pp::renderer::gl::query_opengl_capability_state(
        state,
        pp::renderer::gl::OpenGlCapabilityStateQueryDispatch {
            .is_enabled = is_opengl_state_enabled,
        });
    if (!result.ok()) {
        LOG("%s capability query failed because: %s", context, result.status().message);
        return false;
    }
    return result.value();
}

inline std::uint32_t query_read_framebuffer(const char* context)
{
    std::int32_t read_framebuffer = 0;
    get_opengl_integer_scalar(pp::renderer::gl::read_framebuffer_binding_query(), &read_framebuffer);
    (void)context;
    return static_cast<std::uint32_t>(read_framebuffer);
}

inline void set_capability(std::uint32_t state, bool enabled, const char* context)
{
    const auto status = pp::renderer::gl::apply_opengl_capability(
        state,
        enabled,
        pp::renderer::gl::OpenGlCapabilityDispatch {
            .enable = enable_opengl_state,
            .disable = disable_opengl_state,
        });
    if (!status.ok())
        LOG("%s capability dispatch failed because: %s", context, status.message);
}

inline void activate_texture_unit(std::uint32_t unit_index, const char* context)
{
    const auto status = pp::renderer::gl::activate_opengl_texture_unit(
        unit_index,
        pp::renderer::gl::OpenGlActiveTextureDispatch {
            .active_texture = activate_opengl_texture,
        });
    if (!status.ok())
        LOG("%s active texture dispatch failed because: %s", context, status.message);
}

inline void set_blend_enabled(bool enabled, const char* context)
{
    set_capability(pp::renderer::gl::blend_state(), enabled, context);
}

inline void apply_viewport(
    std::int32_t x,
    std::int32_t y,
    std::int32_t width,
    std::int32_t height,
    const char* context)
{
    const auto status = pp::renderer::gl::apply_opengl_viewport(
        pp::renderer::gl::OpenGlViewportRect {
            .x = x,
            .y = y,
            .width = width,
            .height = height,
        },
        pp::renderer::gl::OpenGlViewportDispatch {
            .viewport = set_opengl_viewport,
        });
    if (!status.ok())
        LOG("%s viewport dispatch failed because: %s", context, status.message);
}

inline void apply_scissor_rect(
    std::int32_t x,
    std::int32_t y,
    std::int32_t width,
    std::int32_t height,
    const char* context)
{
    const auto status = pp::renderer::gl::apply_opengl_scissor_rect(
        pp::renderer::gl::OpenGlScissorRect {
            .enabled = 1U,
            .x = x,
            .y = y,
            .width = width,
            .height = height,
        },
        pp::renderer::gl::OpenGlScissorDispatch {
            .enable = enable_opengl_state,
            .disable = disable_opengl_state,
            .scissor = set_opengl_scissor,
        });
    if (!status.ok())
        LOG("%s scissor dispatch failed because: %s", context, status.message);
}

inline void clear_depth_buffer(const char* context)
{
    const auto status = pp::renderer::gl::clear_opengl_buffers(
        pp::renderer::gl::framebuffer_depth_buffer_mask(),
        pp::renderer::gl::OpenGlBufferClearDispatch {
            .clear = clear_opengl_buffer,
        });
    if (!status.ok())
        LOG("%s depth clear dispatch failed because: %s", context, status.message);
}

inline void set_color_write_mask(
    std::uint8_t r,
    std::uint8_t g,
    std::uint8_t b,
    std::uint8_t a,
    const char* context)
{
    const auto status = pp::renderer::gl::apply_opengl_color_write_mask(
        pp::renderer::gl::OpenGlColorWriteMask {
            .r = r,
            .g = g,
            .b = b,
            .a = a,
        },
        pp::renderer::gl::OpenGlColorWriteMaskDispatch {
            .color_mask = set_opengl_color_mask,
        });
    if (!status.ok())
        LOG("%s color mask dispatch failed because: %s", context, status.message);
}

inline void read_framebuffer_rgba8_pixel(
    std::uint32_t framebuffer,
    std::int32_t x,
    std::int32_t y,
    void* pixel,
    const char* context)
{
    const auto status = pp::renderer::gl::readback_opengl_framebuffer(
        pp::renderer::gl::OpenGlFramebufferReadback {
            .framebuffer = framebuffer,
            .x = x,
            .y = y,
            .width = 1,
            .height = 1,
            .format = pp::renderer::gl::rgba8_readback_format(),
            .pixels = pixel,
        },
        pp::renderer::gl::OpenGlFramebufferReadbackDispatch {
            .get_integer = get_opengl_integer_scalar,
            .bind_framebuffer = bind_opengl_framebuffer,
            .read_pixels = read_opengl_pixels,
        });
    if (!status.ok())
        LOG("%s pixel readback dispatch failed because: %s", context, status.message);
}

inline void clear_color_buffer(std::array<float, 4> color, const char* context)
{
    const auto status = pp::renderer::gl::clear_opengl_render_target(
        pp::renderer::gl::OpenGlDefaultClear {
            .color = color,
            .mask = pp::renderer::gl::framebuffer_color_buffer_mask(),
        },
        pp::renderer::gl::OpenGlClearDispatch {
            .clear_color = set_opengl_clear_color,
            .clear = clear_opengl_buffer,
        });
    if (!status.ok())
        LOG("%s clear dispatch failed because: %s", context, status.message);
}

inline void set_clear_color(std::array<float, 4> color, const char* context)
{
    const auto status = pp::renderer::gl::clear_opengl_render_target(
        pp::renderer::gl::OpenGlDefaultClear {
            .color = color,
            .mask = pp::renderer::gl::framebuffer_color_buffer_mask(),
        },
        pp::renderer::gl::OpenGlClearDispatch {
            .clear_color = set_opengl_clear_color,
            .clear = [](std::uint32_t) noexcept {},
        });
    if (!status.ok())
        LOG("%s clear-color dispatch failed because: %s", context, status.message);
}

inline void unbind_texture_2d(const char* context)
{
    const auto status = pp::renderer::gl::bind_opengl_texture_2d(
        0U,
        pp::renderer::gl::OpenGlTexture2DBindDispatch {
            .bind_texture = bind_opengl_texture,
        });
    if (!status.ok())
        LOG("%s texture bind dispatch failed because: %s", context, status.message);
}

inline void bind_texture_cube(std::uint32_t texture_id, const char* context)
{
    const auto status = pp::renderer::gl::bind_opengl_texture_cube(
        texture_id,
        pp::renderer::gl::OpenGlTexture2DBindDispatch {
            .bind_texture = bind_opengl_texture,
        });
    if (!status.ok())
        LOG("%s cube texture bind dispatch failed because: %s", context, status.message);
}

} // namespace pp::legacy::ui_gl