package com.minamp;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.UUID;

import android.app.Application;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Build;
import android.os.Handler;

import com.minamp.net.CertVerifier;
import com.minamp.net.Http;
import com.minamp.plex.Library;
import com.minamp.plex.Plex;
import com.minamp.plex.Server;
import com.minamp.util.Json;

public class App extends Application {

    private static App instance;
    public static App get() { return instance; }

    public Handler handler;
    public SharedPreferences prefs;
    public Server server;
    public Library library;
    public ImageLoader images;

    // quality: 0 = original (direct play when possible), otherwise MP3 kbps
    public static final int[] QUALITIES = {0, 320, 256, 192, 128, 96};
    public static final String[] QUALITY_LABELS = {"Original", "320 kbps MP3", "256 kbps MP3", "192 kbps MP3", "128 kbps MP3", "96 kbps MP3"};

    @Override
    public void onCreate() {
        super.onCreate();
        instance = this;
        handler = new Handler();
        prefs = getSharedPreferences("minamp", MODE_PRIVATE);
        installCrashLogger();

        // Android 2.2's HttpURLConnection pool is buggy; we use our own client, but be safe.
        System.setProperty("http.keepAlive", "false");

        String cid = prefs.getString("clientId", null);
        if (cid == null) {
            cid = UUID.randomUUID().toString();
            prefs.edit().putString("clientId", cid).commit();
        }
        Plex.clientId = cid;
        Plex.platformVersion = Build.VERSION.RELEASE;
        Plex.device = Build.MODEL;
        Plex.deviceName = Build.MODEL;
        try { Plex.version = getPackageManager().getPackageInfo(getPackageName(), 0).versionName; } catch (Exception ignored) {}

        CertVerifier.setRootStore(new AssetRoots(this));
        Library.preferredVariant = Math.max(0, Math.min(Library.VARIANTS - 1, prefs.getInt("tcVariant", 0)));
        images = new ImageLoader(this);
        Server.preferSecureAtHome = prefs.getBoolean("secureHome", false);
        Server.saver = new Runnable() {
            public void run() {
                // remember which connection worked, so next start tries it first
                final Server s = server;
                if (s == null) return;
                handler.post(new Runnable() {
                    public void run() {
                        if (server == s) prefs.edit().putString("server", s.toJson().toString()).commit();
                    }
                });
            }
        };
        loadServer();
        PlayQueue.get().restore(this);

        registerReceiver(new BroadcastReceiver() {
            @Override public void onReceive(Context c, Intent i) {
                // Network changed (Wi-Fi <-> mobile, new Wi-Fi...): re-pick the best connection lazily.
                if (server != null) server.invalidate();
            }
        }, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    }

    // ------------------------------------------------------------------ crash reports

    private static final String CRASH_FILE = "crash.txt";

    private void installCrashLogger() {
        final Thread.UncaughtExceptionHandler previous = Thread.getDefaultUncaughtExceptionHandler();
        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            public void uncaughtException(Thread t, Throwable e) {
                logError("crash in " + t.getName(), e);
                if (previous != null) previous.uncaughtException(t, e);
            }
        });
    }

    /** Saves a stack trace to app storage (shown on next launch) and to the SD card. */
    public static void logError(String where, Throwable e) {
        App app = instance;
        if (app == null) return;
        try {
            java.io.StringWriter sw = new java.io.StringWriter();
            java.io.PrintWriter pw = new java.io.PrintWriter(sw);
            pw.println("Minamp " + Plex.version + " on " + Build.MODEL + ", Android " + Build.VERSION.RELEASE);
            pw.println(new java.util.Date() + " - " + where);
            e.printStackTrace(pw);
            pw.flush();
            byte[] text = sw.toString().getBytes("UTF-8");
            java.io.FileOutputStream out = app.openFileOutput(CRASH_FILE, MODE_PRIVATE);
            out.write(text);
            out.close();
            try {
                if (android.os.Environment.MEDIA_MOUNTED.equals(android.os.Environment.getExternalStorageState())) {
                    java.io.File f = new java.io.File(android.os.Environment.getExternalStorageDirectory(), "Minamp-error.txt");
                    java.io.FileOutputStream o2 = new java.io.FileOutputStream(f);
                    o2.write(text);
                    o2.close();
                }
            } catch (Throwable ignored) {}
        } catch (Throwable ignored) {}
    }

    /** The last saved error report, or null. Reading it clears it. */
    public String takeCrashReport() {
        try {
            java.io.File f = getFileStreamPath(CRASH_FILE);
            if (!f.exists()) return null;
            String s = new String(readAll(new java.io.FileInputStream(f)), "UTF-8");
            f.delete();
            return s;
        } catch (Exception e) {
            return null;
        }
    }

    // ------------------------------------------------------------------ server/library

    public void loadServer() {
        String sj = prefs.getString("server", null);
        String sec = prefs.getString("section", null);
        server = null;
        library = null;
        if (sj != null) {
            try {
                server = Server.fromJson(Json.parseObj(sj));
                if (sec != null) library = new Library(server, sec);
            } catch (Exception e) {
                server = null;
            }
        }
    }

    public void saveServer(Server s) {
        prefs.edit().putString("server", s.toJson().toString()).remove("section").remove("sectionTitle").commit();
        server = s;
        library = null;
    }

    public void saveSection(String key, String title) {
        prefs.edit().putString("section", key).putString("sectionTitle", title).commit();
        library = new Library(server, key);
    }

    public boolean isConfigured() { return server != null && library != null; }

    public String sectionTitle() { return prefs.getString("sectionTitle", "Music"); }

    public void signOut() {
        prefs.edit().remove("server").remove("section").remove("sectionTitle").remove("account").remove("username").commit();
        server = null;
        library = null;
        Http.evictAll();
    }

    // ------------------------------------------------------------------ quality

    public boolean onMobileData() {
        try {
            ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
            NetworkInfo ni = cm.getActiveNetworkInfo();
            return ni != null && ni.getType() != ConnectivityManager.TYPE_WIFI;
        } catch (Exception e) {
            return false;
        }
    }

    public int qualityHome() { return prefs.getInt("qHome", 0); }
    public int qualityAway() { return prefs.getInt("qAway", 192); }

    /** Max kbps for the current situation; 0 = original. */
    public int currentMaxKbps() {
        boolean away = server == null || !server.isLocal() || onMobileData();
        int q = away ? qualityAway() : qualityHome();
        if (server != null && server.isRelay() && (q == 0 || q > 192)) q = 192; // relay is bandwidth-capped
        return q;
    }

    public boolean downloadFirst() { return prefs.getBoolean("downloadFirst", false); }

    // ------------------------------------------------------------------ trust store

    /** Mozilla roots shipped as assets/roots/<sha1(subject)>-<n>.der */
    static final class AssetRoots implements CertVerifier.RootStore {
        private final Context ctx;
        private Set<String> names;

        AssetRoots(Context c) { ctx = c; }

        public synchronized List<byte[]> find(byte[] subjectDer) {
            try {
                if (names == null) {
                    names = new HashSet<String>();
                    String[] l = ctx.getAssets().list("roots");
                    if (l != null) for (int i = 0; i < l.length; i++) names.add(l[i]);
                }
                String h = CertVerifier.sha1Hex(subjectDer);
                List<byte[]> out = null;
                for (int i = 0; names.contains(h + "-" + i + ".der"); i++) {
                    if (out == null) out = new ArrayList<byte[]>();
                    out.add(readAll(ctx.getAssets().open("roots/" + h + "-" + i + ".der")));
                }
                return out;
            } catch (IOException e) {
                return null;
            }
        }
    }

    static byte[] readAll(InputStream in) throws IOException {
        try {
            ByteArrayOutputStream b = new ByteArrayOutputStream();
            byte[] buf = new byte[4096];
            int n;
            while ((n = in.read(buf)) > 0) b.write(buf, 0, n);
            return b.toByteArray();
        } finally {
            in.close();
        }
    }
}