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#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os
import subprocess
import shutil

def main():
    sdk_path = os.getenv('ANDROID_HOME')
    ndk_path = os.getenv('NDK_HOME')
    standalone_path = os.getenv('NDK_STANDALONE')
    directory = build_directory(sdk_path, args.output.filestem_str , native_shared_libs)

    # // Copy the additional native libs into the libs directory.
    for name, path in native_shared_libs.items():
        shutil.copy( path,  os.path.join( directory, "libs/", "armeabi/",name)

    # compile android_native_app_glue.c
    cmd = os.path.join( standalone_path , "bin/" , "arm-linux-androideabi-gcc ")
    arg1 = os.path.join( ndk_path, "sources/" , "android/" ,"native_app_glue/", "android_native_app_glue.c ")
    arg2 = " -c "
    arg3 = " -o "
    arg4 = directory + "android_native_app_glue.o"

    os.system(cmd + arg1 + arg2 + arg3 + arg4)

    """
    calling gcc to link a shared object
    """
    cmd = os.path.join(standalone_path , "bin/", "arm-linux-androideabi-gcc ")
    arg1 = passthrough
    arg2 = os.path.join( directory , "android_native_app_glue.o")
    arg3 = " -o " + os.path.join( directory ,"libs", "armeabi", "libmain.so")
    arg4 = " -shared"
    arg5 = " -Wl,-E"
    os.system(cmd + arg1 + arg2 + arg3 + arg4 + arg5 )

    """
    call ant debug
    """

    ant_command = "ant debug"
    os.system(ant_command )

    #copy apk file to required dest
    shutil.copy( os.path.join( directory, "bin/", "rust-android-debug.apk"), output)



def find_native_libs(args: &Args) -> HashMap<String, Path> {
    """
    args  HashMap
    """
    base_path = os.path.join( args, "native");
    native_shared_libs = {}
    #for dirpath, dirname, filenames in os.walk(base_path):

    for dirs in os.listdir(base_path):
        if os.path.isdir(dirs):
            for dir in dirs:
                path = os.path.join(base_path, dirs,dir )
                for file in os.listdir(path):
                    if file.starts_with("lib") and file.endwith(".so"):
                        native_shared_libs.update(file, path)

    return native_shared_libs


def build_directory(sdk_dir, crate_name, libs):
    """
    sdk_dir : Path
    crate_name : str
    libs: HashMap<String, Path>

    return: Tempdir

    """
    temp_dir = "android-rs-glue-rust-to-apk"
    build_directory = os.mkdir( temp_dir )

    if len(libs) > 0:
        src_path = os.path.join(temp_dir ,"src/rust/glutin");
        os.mkdirs(src_path )
        java_file = open(os.path.join( src_path, "MainActivity.java") ,"rw")
        java_file.write( (java_src(libs) )
        activity_name = "rust.glutin.MainActivity"
        java_file.flush()
        java_file.close()
    else:
        activity_name = "android.app.NativeActivity"

        manifest_file=os.path.join(build_directory, "AndroidManifest.xml")
        manifest_file = open( manifest_file, "rw")
        manifest_file.write(build_manifest(crate_name, activity_name))
        manifest_file.close()

        build_xml = os.path.join(build_directory, "build.xml")
        build_xml = open( build.xml, "rw")
        build_xml.write( build_build_xml() )
        build_xml.close()

        local_pro = os.path.join(build_directory, "local.properties")
        local_pro  = open(local_pro, "rw")
        local_pro.write(build_local_properties())
        local_pro.close()

        project_pro = os.path.join(build_directory, "project.properties")
        project_pro = open(project_pro, "rw")
        project_pro.write(build_project_properties())
        project_pro.close()

        libs_path = os.path.join(build_directory, "libs/", "armeabi")
        os.makedirs(libs_path)

        return build_directory

def java_src(libs) {
    """
    libs: HashMap,
    returns string
    """
    libs_string = ""

    for  name, _ in libs.items():
        """
        // Strip off the 'lib' prefix and ".so" suffix. This is safe since libs only get added
        // to the hash map if they start with lib.
        """
        line = "        System.loadLibrary(\"{}\");\n".format( name[3:len(name)-3]);
        libs_string = libs_string + line;

    ret = """package rust.glutin;

    public class MainActivity extends android.app.NativeActivity {{
        static {{
            {0}
        }}
    }}""".format(libs_string)
    return ret



def  build_manifest(crate_name , activity_name):
        return """<?xml version="1.0" encoding="utf-8"?>
<!-- BEGIN_INCLUDE(manifest) -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.native_activity"
        android:versionCode="1"
        android:versionName="1.0">

    <uses-sdk android:minSdkVersion="9" />

    <uses-feature android:glEsVersion="0x00020000" android:required="true"></uses-feature>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application android:label="{0}">
        <activity android:name="{1}"
                android:label="{0}"
                android:configChanges="orientation|keyboardHidden">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
<!-- END_INCLUDE(manifest) -->
""".format(crate_name, activity_name)

def build_build_xml():
        return """<?xml version="1.0" encoding="UTF-8"?>
<project name="rust-android" default="help">
    <property file="local.properties" />
    <loadproperties srcFile="project.properties" />
    <import file="custom_rules.xml" optional="true" />
    <import file="${{sdk.dir}}/tools/ant/build.xml" />
</project>
"""


def build_local_properties(sdk_dir):
    return "sdk.dir={0}".format(os.path.abspath(sdk_dir))

def build_project_properties():
    return "target=android-19"

main()