package course.labs.todomanager;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.text.ParseException;
import java.util.Date;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
import course.labs.todomanager.ToDoItem.Priority;
import course.labs.todomanager.ToDoItem.Status;

public class ToDoManagerActivity extends ListActivity {

    // Add a ToDoItem Request Code
    private static final int ADD_TODO_ITEM_REQUEST = 0;

    private static final String FILE_NAME = "TodoManagerActivityData.txt";
    private static final String TAG = "Lab-UserInterface";

    // IDs for menu items
    private static final int MENU_DELETE = Menu.FIRST;
    private static final int MENU_DUMP = Menu.FIRST + 1;

    ToDoListAdapter mAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Create a new TodoListAdapter for this ListActivity's ListView
        mAdapter = new ToDoListAdapter(getApplicationContext());

        // Put divider between ToDoItems and FooterView
        getListView().setFooterDividersEnabled(true);

        TextView footerView = (TextView) getLayoutInflater().inflate(R.layout.footer_view, null);
        getListView().addFooterView(footerView);

        footerView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                log("Entered footerView.OnClickListener.onClick()");
                Intent intent = new Intent(ToDoManagerActivity.this, AddToDoActivity.class);
                startActivityForResult(intent, ADD_TODO_ITEM_REQUEST);
            }
        });

        getListView().setAdapter(mAdapter);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        log("Entered onActivityResult()");

        if (requestCode == ADD_TODO_ITEM_REQUEST) {
            if (resultCode == RESULT_OK) {
                ToDoItem item = new ToDoItem(data);
                mAdapter.add(item);
            }
        }
    }

    // Do not modify below here
    @Override
    public void onResume() {
        super.onResume();
        // Load saved ToDoItems, if necessary
        if (mAdapter.getCount() == 0)
            loadItems();
    }

    @Override
    protected void onPause() {
        super.onPause();
        // Save ToDoItems
        saveItems();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        menu.add(Menu.NONE, MENU_DELETE, Menu.NONE, "Delete all");
        menu.add(Menu.NONE, MENU_DUMP, Menu.NONE, "Dump to log");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case MENU_DELETE:
                mAdapter.clear();
                return true;
            case MENU_DUMP:
                dump();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void dump() {
        for (int i = 0; i < mAdapter.getCount(); i++) {
            String data = ((ToDoItem) mAdapter.getItem(i)).toLog();
            log("Item " + i + ": " + data.replace(ToDoItem.ITEM_SEP, ","));
        }
    }

    // Load stored ToDoItems
    private void loadItems() {
        BufferedReader reader = null;
        try {
            FileInputStream fis = openFileInput(FILE_NAME);
            reader = new BufferedReader(new InputStreamReader(fis));

            String title = null;
            String priority = null;
            String status = null;
            Date date = null;

            while (null != (title = reader.readLine())) {
                priority = reader.readLine();
                status = reader.readLine();
                date = ToDoItem.FORMAT.parse(reader.readLine());
                mAdapter.add(new ToDoItem(title, Priority.valueOf(priority),
                            Status.valueOf(status), date));
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        } finally {
            if (null != reader) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    // Save ToDoItems to file
    private void saveItems() {
        PrintWriter writer = null;
        try {
            FileOutputStream fos = openFileOutput(FILE_NAME, MODE_PRIVATE);
            writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter( fos)));
            for (int idx = 0; idx < mAdapter.getCount(); idx++) {
                writer.println(mAdapter.getItem(idx));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (null != writer) {
                writer.close();
            }
        }
    }

    private void log(String msg) {
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Log.i(TAG, msg);
    }
}