#include <mbgl/platform/gl.hpp>
#include <mbgl/platform/log.hpp>

#include <iostream>


namespace mbgl {
namespace gl {

PFNGLDEBUGMESSAGECONTROLPROC DebugMessageControl = nullptr;
PFNGLDEBUGMESSAGEINSERTPROC DebugMessageInsert = nullptr;
PFNGLDEBUGMESSAGECALLBACKPROC DebugMessageCallback = nullptr;
PFNGLGETDEBUGMESSAGELOGPROC GetDebugMessageLog = nullptr;
PFNGLGETPOINTERVPROC GetPointerv = nullptr;
PFNGLPUSHDEBUGGROUPPROC PushDebugGroup = nullptr;
PFNGLPOPDEBUGGROUPPROC PopDebugGroup = nullptr;
PFNGLOBJECTLABELPROC ObjectLabel = nullptr;
PFNGLGETOBJECTLABELPROC GetObjectLabel = nullptr;
PFNGLOBJECTPTRLABELPROC ObjectPtrLabel = nullptr;
PFNGLGETOBJECTPTRLABELPROC GetObjectPtrLabel = nullptr;

void debug_callback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei, const GLchar *message, const void *) {
    std::string strSource;
    switch (source) {
        case GL_DEBUG_SOURCE_API: strSource = "DEBUG_SOURCE_API"; break;
        case GL_DEBUG_SOURCE_WINDOW_SYSTEM: strSource = "DEBUG_SOURCE_WINDOW_SYSTEM"; break;
        case GL_DEBUG_SOURCE_SHADER_COMPILER: strSource = "DEBUG_SOURCE_SHADER_COMPILER"; break;
        case GL_DEBUG_SOURCE_THIRD_PARTY: strSource = "DEBUG_SOURCE_THIRD_PARTY"; break;
        case GL_DEBUG_SOURCE_APPLICATION: strSource = "DEBUG_SOURCE_APPLICATION"; break;
        case GL_DEBUG_SOURCE_OTHER: strSource = "DEBUG_SOURCE_OTHER"; break;
        default: strSource = "(unknown)"; break;
    }

    std::string strType;
    switch (type) {
        case GL_DEBUG_TYPE_ERROR: strType = "DEBUG_TYPE_ERROR"; break;
        case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: strType = "DEBUG_TYPE_DEPRECATED_BEHAVIOR"; break;
        case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR: strType = "DEBUG_TYPE_UNDEFINED_BEHAVIOR"; break;
        case GL_DEBUG_TYPE_PERFORMANCE: strType = "DEBUG_TYPE_PERFORMANCE"; break;
        case GL_DEBUG_TYPE_PORTABILITY: strType = "DEBUG_TYPE_PORTABILITY"; break;
        case GL_DEBUG_TYPE_OTHER: strType = "DEBUG_TYPE_OTHER"; break;
        case GL_DEBUG_TYPE_MARKER: strType = "DEBUG_TYPE_MARKER"; break;
        case GL_DEBUG_TYPE_PUSH_GROUP: strType = "DEBUG_TYPE_OTHER"; break;
        case GL_DEBUG_TYPE_POP_GROUP: strType = "DEBUG_TYPE_POP_GROUP"; break;
        default: strSource = "(unknown)"; break;
    }

    std::string strSeverity;
    mbgl::EventSeverity evtSeverity;
    switch (severity) {
        case GL_DEBUG_SEVERITY_HIGH: strSeverity = "DEBUG_SEVERITY_HIGH"; evtSeverity = mbgl::EventSeverity::Error; break;
        case GL_DEBUG_SEVERITY_MEDIUM: strSeverity = "DEBUG_SEVERITY_MEDIUM"; evtSeverity = mbgl::EventSeverity::Warning; break;
        case GL_DEBUG_SEVERITY_LOW: strSeverity = "DEBUG_SEVERITY_LOW"; evtSeverity = mbgl::EventSeverity::Info; break;
        case GL_DEBUG_SEVERITY_NOTIFICATION: strSeverity = "DEBUG_SEVERITY_NOTIFICATION"; evtSeverity = mbgl::EventSeverity::Debug; break;
        default: strSource = "(unknown)"; evtSeverity = mbgl::EventSeverity::Debug; break;
    }

    mbgl::Log::Record(evtSeverity, mbgl::Event::OpenGL, "GL_%s GL_%s %u GL_%s - %s", strSource.c_str(), strType.c_str(), id, strSeverity.c_str(), message);
}

PFNGLINSERTEVENTMARKEREXTPROC InsertEventMarkerEXT = nullptr;
PFNGLPUSHGROUPMARKEREXTPROC PushGroupMarkerEXT = nullptr;
PFNGLPOPGROUPMARKEREXTPROC PopGroupMarkerEXT = nullptr;

PFNGLLABELOBJECTEXTPROC LabelObjectEXT = nullptr;
PFNGLGETOBJECTLABELEXTPROC GetObjectLabelEXT = nullptr;

PFNGLBINDVERTEXARRAYPROC BindVertexArray = nullptr;
PFNGLDELETEVERTEXARRAYSPROC DeleteVertexArrays = nullptr;
PFNGLGENVERTEXARRAYSPROC GenVertexArrays = nullptr;
PFNGLISVERTEXARRAYPROC IsVertexArray = nullptr;

bool isPackedDepthStencilSupported = false;

bool isDepth24Supported = false;

void checkError(const char *cmd, const char *file, int line) {
    const GLenum err = glGetError();
    if (err != GL_NO_ERROR) {
        const char *error = nullptr;
        switch (err) {
            case GL_INVALID_ENUM: error = "INVALID_ENUM"; break;
            case GL_INVALID_VALUE: error = "INVALID_VALUE"; break;
            case GL_INVALID_OPERATION: error = "INVALID_OPERATION"; break;
            case GL_INVALID_FRAMEBUFFER_OPERATION:  error = "INVALID_FRAMEBUFFER_OPERATION";  break;
            case GL_OUT_OF_MEMORY: error = "OUT_OF_MEMORY"; break;
#ifdef GL_STACK_UNDERFLOW
            case GL_STACK_UNDERFLOW:  error = "STACK_UNDERFLOW";  break;
#endif
#ifdef GL_STACK_OVERFLOW
            case GL_STACK_OVERFLOW:  error = "STACK_OVERFLOW";  break;
#endif
            default: error = "(unknown)"; break;
        }

        throw ::mbgl::gl::Error(err, std::string(cmd) + ": Error GL_" + error + " - " + file + ":" + std::to_string(line));
    }
}

}
}