package org.floens.chan.activity;

import java.util.ArrayList;
import java.util.List;

import org.floens.chan.R;
import org.floens.chan.fragment.ThreadFragment;
import org.floens.chan.manager.BoardManager;
import org.floens.chan.manager.PinnedManager;
import org.floens.chan.model.Loadable;
import org.floens.chan.model.Pin;
import org.floens.chan.model.Post;
import org.floens.chan.net.ChanUrls;
import org.floens.chan.service.PinnedService;

import android.app.ActionBar;
import android.app.AlertDialog;
import android.app.FragmentTransaction;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;

public class BoardActivity extends BaseActivity implements ActionBar.OnNavigationListener {
    private Loadable boardLoadable = new Loadable();
    private Loadable threadLoadable = new Loadable();
    private ThreadFragment boardFragment;
    private ThreadFragment threadFragment;
    private boolean boardSetByIntent = false;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        boardLoadable.mode = Loadable.Mode.BOARD;
        threadLoadable.mode = Loadable.Mode.THREAD;
        
        boardFragment = ThreadFragment.newInstance(this);
        threadFragment = ThreadFragment.newInstance(this);
        
        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.replace(R.id.left_pane, boardFragment);
        ft.replace(R.id.right_pane, threadFragment);
        ft.commitAllowingStateLoss();
        
        updateActionBarState();
        
        final ActionBar actionBar = getActionBar();
        actionBar.setListNavigationCallbacks(
                new ArrayAdapter<String>(
                    actionBar.getThemedContext(), 
                    R.layout.board_select_spinner,
                    android.R.id.text1,
                    BoardManager.getInstance().getMyBoardsKeys()
                ), this);
        
        Intent startIntent = getIntent();
        Uri startUri = startIntent.getData();
        
        if (savedInstanceState != null) {
            boardLoadable.readFromBundle(this, "board", savedInstanceState);
            boardLoadable.no = 0;
            boardLoadable.listViewIndex = 0;
            boardLoadable.listViewTop = 0;
            
            threadLoadable.readFromBundle(this, "thread", savedInstanceState);
            
            setNavigationFromBoardValue(boardLoadable.board);
            startLoadingThread(threadLoadable);
        } else if (startUri != null) {
            handleIntentURI(startUri);
        } else {
            getActionBar().setSelectedNavigationItem(0);
        }
    }
    
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        
        boardLoadable.writeToBundle(this, "board", outState);
        threadLoadable.writeToBundle(this, "thread", outState);
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        
        PinnedService.onActivityStart();
    }
    
    @Override
    protected void onStop() {
        super.onStop();
        
        PinnedService.onActivityStop();
    }
    
    @Override
    protected void onPause() {
        super.onPause();
        
        PinnedManager.getInstance().updateAll();
    }
    
    @Override
    protected void initDrawer() {
        pinDrawerListener = new ActionBarDrawerToggle(this, pinDrawer, 
                R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close) {};
        
        super.initDrawer();
    }

    @Override
    public boolean onNavigationItemSelected(int position, long id) {
        if (!boardSetByIntent) {
            boardLoadable = new Loadable(BoardManager.getInstance().getMyBoardsValues().get(position));
            startLoadingBoard(boardLoadable);
        }
        
        boardSetByIntent = false;
        
        return true;
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        
        return true;
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        pinDrawerListener.onConfigurationChanged(newConfig);
        updateActionBarState();
    }

    @Override
    public void openPin(Pin pin) {
        startLoadingThread(pin.loadable);
        
        pinDrawer.closeDrawer(pinDrawerView);
    }

    @Override
    public void onOPClicked(Post post) {
        startLoadingThread(new Loadable(post.board, post.no, post.subject));
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        pinDrawerListener.syncState();
    }
    
    @Override
    public void onBackPressed() {
        if (threadPane.isOpen()) {
            super.onBackPressed();
        } else {
            threadPane.openPane();
        }
    }
    
    private void updateActionBarState() {
        final ActionBar actionBar = getActionBar();
        
        if (threadPane.isSlideable()) {
            if (threadPane.isOpen()) {
                actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
                actionBar.setHomeButtonEnabled(true);
                actionBar.setTitle("");
                pinDrawerListener.setDrawerIndicatorEnabled(true);
            } else {
                actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
                actionBar.setTitle(threadLoadable.title);
                pinDrawerListener.setDrawerIndicatorEnabled(false);
            }
            
            actionBar.setDisplayHomeAsUpEnabled(true);
        } else {
            actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
            pinDrawerListener.setDrawerIndicatorEnabled(true);
            actionBar.setTitle(threadLoadable.title);
            
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
        
        actionBar.setDisplayShowTitleEnabled(true);
        
        invalidateOptionsMenu();
    }
    
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        boolean open = threadPane.isOpen();
        boolean slidable = threadPane.isSlideable();
        
        setMenuItemEnabled(menu.findItem(R.id.action_reload_board), slidable && open);
        setMenuItemEnabled(menu.findItem(R.id.action_reload_thread), slidable && !open);
        setMenuItemEnabled(menu.findItem(R.id.action_reload_tablet), !slidable);
        
        setMenuItemEnabled(menu.findItem(R.id.action_pin), !slidable || !open);
        
        setMenuItemEnabled(menu.findItem(R.id.action_reply), slidable);
        setMenuItemEnabled(menu.findItem(R.id.action_reply_tablet), !slidable);
        
        return super.onPrepareOptionsMenu(menu);
    }
    
    private void setMenuItemEnabled(MenuItem item, boolean enabled) {
        if (item != null) {
            item.setVisible(enabled);
            item.setEnabled(enabled);
        }
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (pinDrawerListener.onOptionsItemSelected(item)) {
            return true;
        }
        
        switch(item.getItemId()) {
        case R.id.action_reload_board:
        case R.id.action_reload_tablet_board:
            boardFragment.reload();
            return true;
        case R.id.action_reload_thread:
        case R.id.action_reload_tablet_thread:
            threadFragment.reload();
            return true;
        case R.id.action_reply:
            if (threadPane.isOpen()) {
                boardFragment.openReply();
            } else {
                threadFragment.openReply();
            }
            return true;
        case R.id.action_reply_board:
            boardFragment.openReply();
            
            return true;
        case R.id.action_reply_thread:
            threadFragment.openReply();
            
            return true;
        case R.id.action_pin:
            if (threadFragment.hasLoader()) {
                Pin pin = new Pin();
                pin.loadable = threadLoadable;
                
                addPin(pin);
                
                pinDrawer.openDrawer(pinDrawerView);
            }
            
            return true;
        case R.id.action_open_browser:
            if (threadPane.isOpen()) {
                showUrlOpenPicker(ChanUrls.getBoardUrlDesktop(boardLoadable.board));
            } else {
                if (threadFragment.hasLoader()) {
                    showUrlOpenPicker(ChanUrls.getThreadUrlDesktop(threadLoadable.board, threadLoadable.no));
                }
            }
            
            return true;
        case android.R.id.home:
            threadPane.openPane();
            
            return true;
        }
        
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onPanelClosed(View view) {
        updateActionBarState();
    }

    @Override
    public void onPanelOpened(View view) {
        updateActionBarState();
    }
    
    private void startLoadingBoard(Loadable loadable) {
        if (loadable.mode == Loadable.Mode.INVALID) return;
        
        this.boardLoadable = loadable;
        
        boardFragment.bindLoadable(loadable);
        boardFragment.requestData();
        
        setShareUrl(ChanUrls.getBoardUrlDesktop(loadable.board));
        
        updateActionBarState();
    }
    
    private void startLoadingThread(Loadable loadable) {
        if (loadable.mode == Loadable.Mode.INVALID) return;
        
        Pin pin = PinnedManager.getInstance().findPinByLoadable(loadable);
        if (pin != null) {
            // Use the loadable from the pin.
            // This way we can store the listview position in the pin loadable, 
            // and not in a separate loadable instance.
            loadable = pin.loadable; 
        }
        
        threadLoadable = loadable;
        
        threadFragment.bindLoadable(loadable);
        threadFragment.requestData();
        
        setShareUrl(ChanUrls.getThreadUrlDesktop(loadable.board, loadable.no));
        
        if (TextUtils.isEmpty(loadable.title)) {
            loadable.title = "/" + loadable.board + "/" + loadable.no;
        }
        
        threadPane.closePane();
        
        updateActionBarState();
    }
    
    /**
     * Handle opening from an external url.
     * @param startUri
     */
    private void handleIntentURI(Uri startUri) {
        List<String> parts = startUri.getPathSegments();
        
        if (parts.size() == 1) {
            // Board mode
            String rawBoard = parts.get(0); 
            
            if (BoardManager.getInstance().getBoardExists(rawBoard)) {
                boardSetByIntent = true;
                
                startLoadingBoard(new Loadable(rawBoard));
                
                ActionBar actionBar = getActionBar();
                if (!setNavigationFromBoardValue(rawBoard)) {
                    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
                    actionBar.setDisplayShowTitleEnabled(true);
                    String value = BoardManager.getInstance().getBoardKey(rawBoard);
                    actionBar.setTitle(value == null ? ("/" + rawBoard + "/") : value);
                }
                
            } else {
                handleIntentURIFallback(startUri.toString());
            }
        } else if (parts.size() == 3) {
            // Thread mode
            // First load a board and then start another activity opening the thread
            String rawBoard = parts.get(0);
            int no = -1;
            
            try {
                no = Integer.parseInt(parts.get(2));
            } catch (NumberFormatException e) {}
            
            if (no >= 0 && BoardManager.getInstance().getBoardExists(rawBoard)) {
                boardSetByIntent = true;
                
                startLoadingBoard(new Loadable(rawBoard));
                startLoadingThread(new Loadable(rawBoard, no));
            } else {
                handleIntentURIFallback(startUri.toString());
                return;
            }
        } else {
            showUrlOpenPicker(startUri.toString());
        }
    }
    
    private void handleIntentURIFallback(final String url) {
        new AlertDialog.Builder(this)
            .setTitle(R.string.open_unknown_title)
            .setMessage(R.string.open_unknown)
            .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // Cancel button
                    finish();
                }
            })
            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // Ok button
                    showUrlOpenPicker(url);
                }
            })
            .setCancelable(false)
            .create()
            .show();
    }
    
    /**
     * Set the visual selector to the board. If the user has not set the board as a favorite,
     * return false.
     * @param boardValue
     * @return true if spinner was set, false otherwise
     */
    private boolean setNavigationFromBoardValue(String boardValue) {
        ArrayList<String> list = BoardManager.getInstance().getMyBoardsValues();
        int foundIndex = -1;
        for (int i = 0; i < list.size(); i++) {
            if (list.get(i).equals(boardValue)) {
                foundIndex = i;
                break;
            }
        }
        
        if (foundIndex >= 0) {
            getActionBar().setSelectedNavigationItem(foundIndex);
            return true;
        } else {
            return false;
        }
    }
}