/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.opengl;

import java.io.IOException;
import java.io.Writer;

import javax.microedition.khronos.egl.EGL;
import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGL11;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLContext;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.egl.EGLSurface;

class EGLLogWrapper implements EGL11 {
    private EGL10 mEgl10;
    Writer mLog;
    boolean mLogArgumentNames;
    boolean mCheckError;
    private int mArgCount;


    public EGLLogWrapper(EGL egl, int configFlags, Writer log) {
        mEgl10 = (EGL10) egl;
        mLog = log;
        mLogArgumentNames =
            (GLDebugHelper.CONFIG_LOG_ARGUMENT_NAMES & configFlags) != 0;
        mCheckError =
            (GLDebugHelper.CONFIG_CHECK_GL_ERROR & configFlags) != 0;
    }

    public boolean eglChooseConfig(EGLDisplay display, int[] attrib_list,
            EGLConfig[] configs, int config_size, int[] num_config) {
        begin("eglChooseConfig");
        arg("display", display);
        arg("attrib_list", attrib_list);
        arg("config_size", config_size);
        end();

        boolean result = mEgl10.eglChooseConfig(display, attrib_list, configs,
                config_size, num_config);
        arg("configs", configs);
        arg("num_config", num_config);
        returns(result);
        checkError();
        return result;
    }

    public boolean eglCopyBuffers(EGLDisplay display, EGLSurface surface,
            Object native_pixmap) {
        begin("eglCopyBuffers");
        arg("display", display);
        arg("surface", surface);
        arg("native_pixmap", native_pixmap);
        end();

        boolean result = mEgl10.eglCopyBuffers(display, surface, native_pixmap);
        returns(result);
        checkError();
        return result;
    }

    public EGLContext eglCreateContext(EGLDisplay display, EGLConfig config,
            EGLContext share_context, int[] attrib_list) {
        begin("eglCreateContext");
        arg("display", display);
        arg("config", config);
        arg("share_context", share_context);
        arg("attrib_list", attrib_list);
        end();

        EGLContext result = mEgl10.eglCreateContext(display, config,
                share_context, attrib_list);
        returns(result);
        checkError();
        return result;
    }

    public EGLSurface eglCreatePbufferSurface(EGLDisplay display,
            EGLConfig config, int[] attrib_list) {
        begin("eglCreatePbufferSurface");
        arg("display", display);
        arg("config", config);
        arg("attrib_list", attrib_list);
        end();

        EGLSurface result = mEgl10.eglCreatePbufferSurface(display, config,
                attrib_list);
        returns(result);
        checkError();
        return result;
    }

    public EGLSurface eglCreatePixmapSurface(EGLDisplay display,
            EGLConfig config, Object native_pixmap, int[] attrib_list) {
        begin("eglCreatePixmapSurface");
        arg("display", display);
        arg("config", config);
        arg("native_pixmap", native_pixmap);
        arg("attrib_list", attrib_list);
        end();

        EGLSurface result = mEgl10.eglCreatePixmapSurface(display, config,
                native_pixmap, attrib_list);
        returns(result);
        checkError();
        return result;
        }

    public EGLSurface eglCreateWindowSurface(EGLDisplay display,
            EGLConfig config, Object native_window, int[] attrib_list) {
        begin("eglCreateWindowSurface");
        arg("display", display);
        arg("config", config);
        arg("native_window", native_window);
        arg("attrib_list", attrib_list);
        end();

        EGLSurface result = mEgl10.eglCreateWindowSurface(display, config,
                native_window, attrib_list);
        returns(result);
        checkError();
        return result;
    }

    public boolean eglDestroyContext(EGLDisplay display, EGLContext context) {
        begin("eglDestroyContext");
        arg("display", display);
        arg("context", context);
        end();

        boolean result = mEgl10.eglDestroyContext(display, context);
        returns(result);
        checkError();
        return result;
    }

    public boolean eglDestroySurface(EGLDisplay display, EGLSurface surface) {
        begin("eglDestroySurface");
        arg("display", display);
        arg("surface", surface);
        end();

        boolean result = mEgl10.eglDestroySurface(display, surface);
        returns(result);
        checkError();
        return result;
    }

    public boolean eglGetConfigAttrib(EGLDisplay display, EGLConfig config,
            int attribute, int[] value) {
        begin("eglGetConfigAttrib");
        arg("display", display);
        arg("config", config);
        arg("attribute", attribute);
        end();
        boolean result = mEgl10.eglGetConfigAttrib(display, config, attribute,
                value);
        arg("value", value);
        returns(result);
        checkError();
        return false;
    }

    public boolean eglGetConfigs(EGLDisplay display, EGLConfig[] configs,
            int config_size, int[] num_config) {
        begin("eglGetConfigs");
        arg("display", display);
        arg("config_size", config_size);
        end();

        boolean result = mEgl10.eglGetConfigs(display, configs, config_size,
                num_config);
        arg("configs", configs);
        arg("num_config", num_config);
        returns(result);
        checkError();
        return result;
    }

    public EGLContext eglGetCurrentContext() {
        begin("eglGetCurrentContext");
        end();

        EGLContext result = mEgl10.eglGetCurrentContext();
        returns(result);

        checkError();
        return result;
    }

    public EGLDisplay eglGetCurrentDisplay() {
        begin("eglGetCurrentDisplay");
        end();

        EGLDisplay result = mEgl10.eglGetCurrentDisplay();
        returns(result);

        checkError();
        return result;
    }

    public EGLSurface eglGetCurrentSurface(int readdraw) {
        begin("eglGetCurrentSurface");
        arg("readdraw", readdraw);
        end();

        EGLSurface result = mEgl10.eglGetCurrentSurface(readdraw);
        returns(result);

        checkError();
        return result;
    }

    public EGLDisplay eglGetDisplay(Object native_display) {
        begin("eglGetDisplay");
        arg("native_display", native_display);
        end();

        EGLDisplay result = mEgl10.eglGetDisplay(native_display);
        returns(result);

        checkError();
        return result;
    }

    public int eglGetError() {
        begin("eglGetError");
        end();

        int result = mEgl10.eglGetError();
        returns(getErrorString(result));

        return result;
    }

    public boolean eglInitialize(EGLDisplay display, int[] major_minor) {
        begin("eglInitialize");
        arg("display", display);
        end();
        boolean result = mEgl10.eglInitialize(display, major_minor);
        returns(result);
        arg("major_minor", major_minor);
        checkError();
        return result;
    }

    public boolean eglMakeCurrent(EGLDisplay display, EGLSurface draw,
            EGLSurface read, EGLContext context) {
        begin("eglMakeCurrent");
        arg("display", display);
        arg("draw", draw);
        arg("read", read);
        arg("context", context);
        end();
        boolean result = mEgl10.eglMakeCurrent(display, draw, read, context);
        returns(result);
        checkError();
        return result;
    }

    public boolean eglQueryContext(EGLDisplay display, EGLContext context,
            int attribute, int[] value) {
        begin("eglQueryContext");
        arg("display", display);
        arg("context", context);
        arg("attribute", attribute);
        end();
        boolean result = mEgl10.eglQueryContext(display, context, attribute,
                value);
        returns(value[0]);
        returns(result);
        checkError();
        return result;
    }

    public String eglQueryString(EGLDisplay display, int name) {
        begin("eglQueryString");
        arg("display", display);
        arg("name", name);
        end();
        String result = mEgl10.eglQueryString(display, name);
        returns(result);
        checkError();
        return result;
    }

    public boolean eglQuerySurface(EGLDisplay display, EGLSurface surface,
            int attribute, int[] value) {
        begin("eglQuerySurface");
        arg("display", display);
        arg("surface", surface);
        arg("attribute", attribute);
        end();
        boolean result = mEgl10.eglQuerySurface(display, surface, attribute,
                value);
        returns(value[0]);
        returns(result);
        checkError();
        return result;
    }
    
    /** @hide **/
    public boolean eglReleaseThread() {
        begin("eglReleaseThread");
        end();
        boolean result = mEgl10.eglReleaseThread();
        returns(result);
        checkError();
        return result;
    }

    public boolean eglSwapBuffers(EGLDisplay display, EGLSurface surface) {
        begin("eglSwapBuffers");
        arg("display", display);
        arg("surface", surface);
        end();
        boolean result = mEgl10.eglSwapBuffers(display, surface);
        returns(result);
        checkError();
        return result;
    }

    public boolean eglTerminate(EGLDisplay display) {
        begin("eglTerminate");
        arg("display", display);
        end();
        boolean result = mEgl10.eglTerminate(display);
        returns(result);
        checkError();
        return result;
    }

    public boolean eglWaitGL() {
        begin("eglWaitGL");
        end();
        boolean result = mEgl10.eglWaitGL();
        returns(result);
        checkError();
        return result;
    }

    public boolean eglWaitNative(int engine, Object bindTarget) {
        begin("eglWaitNative");
        arg("engine", engine);
        arg("bindTarget", bindTarget);
        end();
        boolean result = mEgl10.eglWaitNative(engine, bindTarget);
        returns(result);
        checkError();
        return result;
    }

    private void checkError() {
        int eglError;
        if ((eglError = mEgl10.eglGetError()) != EGL_SUCCESS) {
            String errorMessage = "eglError: " + getErrorString(eglError);
            logLine(errorMessage);
            if (mCheckError) {
                throw new GLException(eglError, errorMessage);
            }
        }
    }

    private void logLine(String message) {
        log(message + '\n');
    }

    private void log(String message) {
        try {
            mLog.write(message);
        } catch (IOException e) {
            // Ignore exception, keep on trying
        }
    }

    private void begin(String name) {
        log(name + '(');
        mArgCount = 0;
    }

    private void arg(String name, String value) {
        if (mArgCount++ > 0) {
            log(", ");
        }
        if (mLogArgumentNames) {
            log(name + "=");
        }
        log(value);
    }

    private void end() {
        log(");\n");
        flush();
    }

    private void flush() {
        try {
            mLog.flush();
        } catch (IOException e) {
            mLog = null;
        }
    }

    private void arg(String name, int value) {
        arg(name, Integer.toString(value));
    }

    private void arg(String name, Object object) {
        arg(name, toString(object));
    }

    private void arg(String name, EGLDisplay object) {
        if (object == EGL10.EGL_DEFAULT_DISPLAY) {
            arg(name, "EGL10.EGL_DEFAULT_DISPLAY");
        } else if (object == EGL_NO_DISPLAY) {
            arg(name, "EGL10.EGL_NO_DISPLAY");
        } else {
            arg(name, toString(object));
        }
    }

    private void arg(String name, EGLContext object) {
        if (object == EGL10.EGL_NO_CONTEXT) {
            arg(name, "EGL10.EGL_NO_CONTEXT");
        } else {
            arg(name, toString(object));
        }
    }

    private void arg(String name, EGLSurface object) {
        if (object == EGL10.EGL_NO_SURFACE) {
            arg(name, "EGL10.EGL_NO_SURFACE");
        } else {
            arg(name, toString(object));
        }
    }

    private void returns(String result) {
        log(" returns " + result + ";\n");
        flush();
    }

    private void returns(int result) {
        returns(Integer.toString(result));
    }

    private void returns(boolean result) {
        returns(Boolean.toString(result));
    }

    private void returns(Object result) {
        returns(toString(result));
    }

    private String toString(Object obj) {
        if (obj == null) {
            return "null";
        } else {
            return obj.toString();
        }
    }

    private void arg(String name, int[] arr) {
        if (arr == null) {
            arg(name, "null");
        } else {
            arg(name, toString(arr.length, arr, 0));
        }
    }

    private void arg(String name, Object[] arr) {
        if (arr == null) {
            arg(name, "null");
        } else {
            arg(name, toString(arr.length, arr, 0));
        }
    }

    private String toString(int n, int[] arr, int offset) {
        StringBuilder buf = new StringBuilder();
        buf.append("{\n");
        int arrLen = arr.length;
        for (int i = 0; i < n; i++) {
            int index = offset + i;
            buf.append(" [" + index + "] = ");
            if (index < 0 || index >= arrLen) {
                buf.append("out of bounds");
            } else {
                buf.append(arr[index]);
            }
            buf.append('\n');
        }
        buf.append("}");
        return buf.toString();
    }

    private String toString(int n, Object[] arr, int offset) {
        StringBuilder buf = new StringBuilder();
        buf.append("{\n");
        int arrLen = arr.length;
        for (int i = 0; i < n; i++) {
            int index = offset + i;
            buf.append(" [" + index + "] = ");
            if (index < 0 || index >= arrLen) {
                buf.append("out of bounds");
            } else {
                buf.append(arr[index]);
            }
            buf.append('\n');
        }
        buf.append("}");
        return buf.toString();
    }

    private static String getHex(int value) {
        return "0x" + Integer.toHexString(value);
    }

    public static String getErrorString(int error) {
        switch (error) {
        case EGL_SUCCESS:
            return "EGL_SUCCESS";
        case EGL_NOT_INITIALIZED:
            return "EGL_NOT_INITIALIZED";
        case EGL_BAD_ACCESS:
            return "EGL_BAD_ACCESS";
        case EGL_BAD_ALLOC:
            return "EGL_BAD_ALLOC";
        case EGL_BAD_ATTRIBUTE:
            return "EGL_BAD_ATTRIBUTE";
        case EGL_BAD_CONFIG:
            return "EGL_BAD_CONFIG";
        case EGL_BAD_CONTEXT:
            return "EGL_BAD_CONTEXT";
        case EGL_BAD_CURRENT_SURFACE:
            return "EGL_BAD_CURRENT_SURFACE";
        case EGL_BAD_DISPLAY:
            return "EGL_BAD_DISPLAY";
        case EGL_BAD_MATCH:
            return "EGL_BAD_MATCH";
        case EGL_BAD_NATIVE_PIXMAP:
            return "EGL_BAD_NATIVE_PIXMAP";
        case EGL_BAD_NATIVE_WINDOW:
            return "EGL_BAD_NATIVE_WINDOW";
        case EGL_BAD_PARAMETER:
            return "EGL_BAD_PARAMETER";
        case EGL_BAD_SURFACE:
            return "EGL_BAD_SURFACE";
        case EGL11.EGL_CONTEXT_LOST:
            return "EGL_CONTEXT_LOST";
        default:
            return getHex(error);
        }
    }
}