import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComponent;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.JSeparator;
import javax.swing.JRadioButton;
import javax.swing.JOptionPane;
import javax.swing.ButtonGroup;
import javax.swing.Box;
import javax.swing.BorderFactory;
import java.awt.BorderLayout;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.Cursor;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.util.List;
import java.util.ArrayList;
import java.net.URL;
import java.net.MalformedURLException;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.event.FocusListener;
import java.awt.event.FocusEvent;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;

import cafe.biskuteri.hinoki.Tree;
import java.io.IOException;
import java.time.ZonedDateTime;
import java.time.ZoneId;
import java.time.Period;
import java.time.temporal.ChronoUnit;
import java.time.format.DateTimeParseException;

class
TimelineWindow extends JFrame
implements ActionListener {

    private JKomasto
    primaire;

    private MastodonApi
    api;

    private TimelinePage
    page;

//   -  -%-  -

    private TimelineComponent
    display;

    private JMenuItem
    openHome,
    openMessages,
    openLocal,
    openFederated,
	openNotifications,
	openOwnProfile,
	openProfile,
    createPost,
    openAutoPostView,
    quit;

    private JMenuItem
    flipToNewestPost;

//   -  -%-  -

    private static final int
    PREVIEW_COUNT = TimelineComponent.PREVIEW_COUNT;

//  ---%-@-%---

	public void
	receive(Tree<String> pageEntity)
	{
		page.posts = pageEntity;
		display.displayEntities(page.posts);
		boolean full = pageEntity.size() >= PREVIEW_COUNT;
		display.setNextPageAvailable(full);
		display.setPreviousPageAvailable(true);
		display.resetFocus();
	}

	public void
	refresh()
	{
		
	}

    public void
    setTimelineType(TimelineType type)
    {
        page.type = type;
        page.accountNumId = null;

		String s1 = type.toString();
        s1 = s1.charAt(0) + s1.substring(1).toLowerCase();
        setTitle(s1 + " - JKomasto");

        String s2 = type.toString().toLowerCase();
		display.setBackgroundImage(ImageApi.local(s2));
    }

    public TimelineType
    getTimelineType() { return page.type; }

    public void
    showAuthorPosts(String authorNumId)
    {
        assert authorNumId != null;

        page.type = TimelineType.FEDERATED;
        page.accountNumId = authorNumId;

        setTitle(authorNumId + " - JKomasto");
        display.setBackgroundImage(ImageApi.local("profile"));
    }

    public void
    showLatestPage()
    {
        display.setCursor(new Cursor(Cursor.WAIT_CURSOR));
        api.getTimelinePage(
            page.type,
			PREVIEW_COUNT, null, null,
			page.accountNumId, page.listId,
            new RequestListener() {

                public void
                connectionFailed(IOException eIo)
                {
					JOptionPane.showMessageDialog(
						TimelineWindow.this,
						"Failed to fetch page.."
						+ "\n" + eIo.getMessage()
					);
                }

                public void
                requestFailed(int httpCode, Tree<String> json)
                {
                    JOptionPane.showMessageDialog(
						TimelineWindow.this,
						"Failed to fetch page.."
						+ "\n" + json.get("error").value
						+ "\n(HTTP code: " + httpCode + ")"
					);
                }

                public void
                requestSucceeded(Tree<String> json)
                {
                    receive(json);
                }

            }
        );
        display.setCursor(null);
    }

    public void
    nextPage()
    {
        assert page.posts != null;
        assert page.posts.size() != 0;
		Tree<String> last = page.posts.get(page.posts.size() - 1);
		String lastId = last.get("id").value;

        display.setCursor(new Cursor(Cursor.WAIT_CURSOR));
        api.getTimelinePage(
            page.type,
			PREVIEW_COUNT, lastId, null,
			page.accountNumId, page.listId,
            new RequestListener() {

                public void
                connectionFailed(IOException eIo)
                {
					JOptionPane.showMessageDialog(
						TimelineWindow.this,
						"Failed to fetch page.."
						+ "\n" + eIo.getMessage()
					);
                }

                public void
                requestFailed(int httpCode, Tree<String> json)
                {
                    JOptionPane.showMessageDialog(
						TimelineWindow.this,
						"Failed to fetch page.."
						+ "\n" + json.get("error").value
						+ "\n(HTTP code: " + httpCode + ")"
					);
                }

                public void
                requestSucceeded(Tree<String> json)
                {
                    if (json.size() == 0) {
                        // We should probably say something
                        // to the user here? For now, we
                        // quietly cancel.
                        return;
                    }
                    page.posts = json;
                    display.displayEntities(page.posts);
                    boolean full = json.size() >= PREVIEW_COUNT;
                    display.setNextPageAvailable(full);
                    display.setPreviousPageAvailable(true);
                    display.resetFocus();
                }

            }
        );
        display.setCursor(null);
    }

    public void
    previousPage()
    {
        assert page.posts != null;
        assert page.posts.size() != 0;
        Tree<String> first = page.posts.get(0);
		String firstId = first.get("id").value;

        display.setCursor(new Cursor(Cursor.WAIT_CURSOR));
        api.getTimelinePage(
            page.type,
 			PREVIEW_COUNT, null, firstId,
			page.accountNumId, page.listId,
            new RequestListener() {

                public void
                connectionFailed(IOException eIo)
                {
					JOptionPane.showMessageDialog(
						TimelineWindow.this,
						"Failed to fetch page.."
						+ "\n" + eIo.getMessage()
					);
                }

                public void
                requestFailed(int httpCode, Tree<String> json)
                {
                    JOptionPane.showMessageDialog(
						TimelineWindow.this,
						"Failed to fetch page.."
						+ "\n" + json.get("error").value
						+ "\n(HTTP code: " + httpCode + ")"
					);
                }

                public void
                requestSucceeded(Tree<String> json)
                {
					if (json.size() < PREVIEW_COUNT) {
                        showLatestPage();
                        return;
                    }
                    page.posts = json;
                    display.displayEntities(page.posts);
                    display.setNextPageAvailable(true);
                    display.setPreviousPageAvailable(true);
                    display.resetFocus();
                }

            }
        );
        display.setCursor(null);
    }

	public void
	openOwnProfile()
	{
		Tree<String> accountDetails = api.getAccountDetails();
		String id = accountDetails.get("id").value;
		assert id != null;

		TimelineWindow w = new TimelineWindow(primaire);
        w.showAuthorPosts(id);
        w.showLatestPage();
        w.setLocationRelativeTo(this);
        w.setVisible(true);
	}

	public void
	openProfile()
	{
		String query = JOptionPane.showInputDialog(
			this,
			"Whose account do you want to see?\n"
			+ "Type an account name with the instance,\n"
			+ "or a display name if you can't remember.\n",
			"Profile search",
			JOptionPane.PLAIN_MESSAGE
		);
		if (query == null) return;

		class Handler implements RequestListener {

			public Tree<String>
			json;
			
//			-=%=-

			public void
			connectionFailed(IOException eIo)
			{
				JOptionPane.showMessageDialog(
					TimelineWindow.this,
					"Tried to fetch accounts, but it failed.."
					+ "\n" + eIo.getMessage()
				);
			}

			public void
			requestFailed(int httpCode, Tree<String> json)
			{
				JOptionPane.showMessageDialog(
					TimelineWindow.this,
					"Tried to fetch accounts, but it failed.."
					+ "\n" + json.get("error").value
					+ "\n(HTTP code: " + httpCode + ")"
				);
			}

			public void
			requestSucceeded(Tree<String> json) { this.json = json; }

		}
		// (知) Have to create a named class because
		// it has to hold the variable.
		Handler handler = new Handler();
		api.getAccounts(query, handler);
		if (handler.json == null) return;

		if (handler.json.size() == 0) {
			JOptionPane.showMessageDialog(
				this,
				"There were no results from the query.. ☹️"
			);
			return;
		}

		String id = null;
		if (query.startsWith("@")) query = query.substring(1);

		List<Object> message = new ArrayList<>();
		message.add("Maybe one of these?");
		ButtonGroup selGroup = new ButtonGroup();
		for (Tree<String> account: handler.json)
		{
			String dname = account.get("display_name").value;
			String acct = account.get("acct").value;
			if (query.equals(acct)) {
				id = account.get("id").value;
				break;
			}
			JRadioButton b = new JRadioButton();
			b.setText(dname + " (" + acct + ")");
			selGroup.add(b);
			message.add(b);
		}
		if (id == null)
		{
			int response = JOptionPane.showConfirmDialog(
				this,
				message.toArray(),
				"Search results",
				JOptionPane.OK_CANCEL_OPTION
			);
			if (response == JOptionPane.CANCEL_OPTION) return;
			for (int o = 1; o < message.size(); ++o)
			{
				JRadioButton b = (JRadioButton)message.get(o);
				if (selGroup.isSelected(b.getModel()))
				{
					id = handler.json.get(o - 1).get("id").value;
					break;
				}
			}
		}

		TimelineWindow w = new TimelineWindow(primaire);
        w.showAuthorPosts(id);
        w.showLatestPage();
        w.setLocationRelativeTo(this);
        w.setVisible(true);
	}

//   -  -%-  -

    public void
    postSelected(Tree<String> post)
    {
        primaire.getAutoViewWindow().displayEntity(post);
    }

    public void
    postOpened(Tree<String> post)
    {
        PostWindow w = new PostWindow(primaire);
        w.displayEntity(post);
        w.setLocationRelativeTo(this);
        w.setVisible(true);
    }

    public void
    actionPerformed(ActionEvent eA)
    {
        Object src = eA.getSource();

        if (src == openHome)
        {
            setTimelineType(TimelineType.HOME);
            showLatestPage();
        }
        if (src == openFederated)
        {
            setTimelineType(TimelineType.FEDERATED);
            showLatestPage();
        }
        if (src == openLocal)
        {
            setTimelineType(TimelineType.LOCAL);
            showLatestPage();
        }
		if (src == openOwnProfile)
        {
			openOwnProfile();
        }
		if (src == openProfile)
        {
			openProfile();
        }
        if (src == createPost)
        {
            primaire.getComposeWindow().setVisible(true);
        }
        if (src == openAutoPostView)
        {
            PostWindow w = primaire.getAutoViewWindow();
            w.setLocation(getX() + 10 + getWidth(), getY());
            w.setVisible(true);
        }
		if (src == openNotifications)
        {
			NotificationsWindow w = primaire.getNotificationsWindow();
			w.setLocationByPlatform(true);
			w.setVisible(true);
        }
        if (src == flipToNewestPost)
        {
            showLatestPage();
        }
        if (src == quit)
        {
            /*
            * Umm.. should we even have a quit option?
            * Wouldn't closing every window work? By
            * disposing of everyone. We won't be having any
            * background threads IIRC (and they can check
            * if the Swing thread is alive).
            */
            dispose();
        }
    }

//	 -	-%-	 -

    private static String
    plainify(String html)
    {
        // Delete all tags.
        StringBuilder b = new StringBuilder();
        boolean in = false;
        for (char c: html.toCharArray()) switch (c) {
            case '<': in = true; break;
            case '>': in = false; break;
            default: if (!in) b.append(c);
        }
        String s = b.toString();
        s = s.replaceAll("&lt;", "<");
        s = s.replaceAll("&gt;", ">");
        s = s.replaceAll("&nbsp;", "");
        return s;
    }

//  ---%-@-%---

    TimelineWindow(JKomasto primaire)
    {
        this.primaire = primaire;
        this.api = primaire.getMastodonApi();

        getContentPane().setPreferredSize(new Dimension(320, 460));
        pack();
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);

        openHome = new JMenuItem("Open home timeline");
        openFederated = new JMenuItem("Open federated timeline");
		openNotifications = new JMenuItem("Open notifications");
		openOwnProfile = new JMenuItem("Open own profile");
		openProfile = new JMenuItem("Open profile..");
        createPost = new JMenuItem("Create a post");
        openAutoPostView = new JMenuItem("Open auto post view");
        quit = new JMenuItem("Quit");
        openHome.addActionListener(this);
        openFederated.addActionListener(this);
		openNotifications.addActionListener(this);
		openOwnProfile.addActionListener(this);
		openProfile.addActionListener(this);
        createPost.addActionListener(this);
        openAutoPostView.addActionListener(this);
        quit.addActionListener(this);

        flipToNewestPost = new JMenuItem("Flip to newest post");
        flipToNewestPost.addActionListener(this);

        JMenu programMenu = new JMenu("Program");
        programMenu.setMnemonic(KeyEvent.VK_P);
        programMenu.add(openHome);
        programMenu.add(openFederated);
		programMenu.add(openNotifications);
		programMenu.add(openOwnProfile);
		programMenu.add(openProfile);
        programMenu.add(new JSeparator());
        programMenu.add(createPost);
        programMenu.add(openAutoPostView);
        programMenu.add(new JSeparator());
        programMenu.add(quit);
        JMenu timelineMenu = new JMenu("Timeline");
        timelineMenu.setMnemonic(KeyEvent.VK_T);
        timelineMenu.add(flipToNewestPost);
        JMenuBar menuBar = new JMenuBar();
        menuBar.add(programMenu);
        menuBar.add(timelineMenu);
        setJMenuBar(menuBar);

        page = new TimelinePage();
        page.posts = new Tree<String>();

        display = new TimelineComponent(this);
        display.setNextPageAvailable(false);
        display.setPreviousPageAvailable(false);
        setContentPane(display);

		setTimelineType(TimelineType.HOME);
    }

}



class
TimelineComponent extends JPanel
implements
    ActionListener, KeyListener,
    MouseListener, FocusListener {

    private TimelineWindow
    primaire;

	private Tree<String>
	posts;

//   -  -%-  -

    private JButton
    next, prev;

    private JLabel
    pageLabel;

    private final List<PostPreviewComponent>
    postPreviews;

    private boolean
    hoverSelect;

	private Image
	backgroundImage;

//   -  -%-  -

    static final int
    PREVIEW_COUNT = 10;

//  ---%-@-%---

	public void
	displayEntities(Tree<String> postArray)
	{
		assert postArray.size() <= postPreviews.size();
		this.posts = postArray;

		for (int o = 0; o < postArray.size(); ++o)
		{
			PostPreviewComponent c = postPreviews.get(o);
			Tree<String> p = postArray.get(o);
			Tree<String> a = p.get("account");

			String an = a.get("display_name").value;
			if (an.isEmpty()) an = a.get("username").value;
			c.setTopLeft(an);

			Tree<String> boosted = p.get("reblog");
			if (boosted.size() > 0) {
				c.setTopLeft("boosted by " + an);
				p = boosted;
				a = p.get("account");
			}

			String f = "";
			if (p.get("media_attachments").size() > 0) f += "a";
			String t = "";
			try {
				String jv = p.get("created_at").value;
				ZonedDateTime pv = ZonedDateTime.parse(jv);
                ZoneId z = ZoneId.systemDefault();
                pv = pv.withZoneSameInstant(z);

				ZonedDateTime now = ZonedDateTime.now();
                long d = ChronoUnit.SECONDS.between(pv, now);
                long s = Math.abs(d);
                if (s < 30) t = "now";
                else if (s < 60) t = d + "s";
                else if (s < 3600) t = (d / 60) + "m";
                else if (s < 86400) t = (d / 3600) + "h";
                else t = (d / 86400) + "d";
			}
			catch (DateTimeParseException eDt) {
                assert false;
            }
			c.setTopRight(f + " " + t);

			String html = p.get("content").value;
			String cw = p.get("spoiler_text").value;
			if (!cw.isEmpty())
				c.setBottom("(" + cw + ")");
			else
				c.setBottom(textApproximation(html));
		}
        for (int o = posts.size(); o < postPreviews.size(); ++o)
        {
            postPreviews.get(o).reset();
        }
	}

    public void
    setPageLabel(String label)
    {
        assert label != null;
        pageLabel.setText("" + label);
    }

    public void
    setNextPageAvailable(boolean n) { next.setEnabled(n); }

    public void
    setPreviousPageAvailable(boolean n) { prev.setEnabled(n); }

    public void
    setHoverSelect(boolean n) { hoverSelect = n; }

	public void
	setBackgroundImage(Image n) { backgroundImage = n; }

	public void
	resetFocus() { postPreviews.get(0).requestFocusInWindow(); }

//   -  -%-  -

	protected void
	paintComponent(Graphics g)
	{
        ((java.awt.Graphics2D)g).setRenderingHint(
        	java.awt.RenderingHints.KEY_ANTIALIASING,
        	java.awt.RenderingHints.VALUE_ANTIALIAS_ON
		);

		int w = getWidth(), h = getHeight();
		g.clearRect(0, 0, w, h);
		int h2 = h * 5 / 10, w2 = h2;
		int x = w - w2, y = h - h2;
		g.drawImage(backgroundImage, x, y, w2, h2, this);
	}

	private void
	select(Object c)
	{
        assert c instanceof PostPreviewComponent;

		for (int o = 0; o < postPreviews.size(); ++o)
		{
			PostPreviewComponent p = postPreviews.get(o);
			if (c == p) {
				primaire.postSelected(posts.get(o));
				p.setSelected(true);
        		p.repaint();
			}
			else deselect(p);
		}
	}

	private void
	deselect(Object c)
	{
        assert c instanceof PostPreviewComponent;
        PostPreviewComponent p = (PostPreviewComponent)c;

        p.setSelected(false);
        p.repaint();
	}

	private void
	open(Object c)
	{
        assert c instanceof PostPreviewComponent;
        PostPreviewComponent p = (PostPreviewComponent)c;

        int o = postPreviews.indexOf(p);
        assert o != -1;
		if (o >= posts.size()) return;
		primaire.postOpened(posts.get(o));
	}

    public void
    focusGained(FocusEvent eF) { select(eF.getSource()); }

    public void
    focusLost(FocusEvent eF) { deselect(eF.getSource()); }

	public void
    mouseClicked(MouseEvent eM)
    {
        if (eM.getClickCount() == 2) open(eM.getSource());
        else select(eM.getSource());
    }

	public void
    mouseEntered(MouseEvent eM)
    {
        if (!hoverSelect) return;
        mouseClicked(eM);
    }

    public void
    mouseExited(MouseEvent eM)
    {
        if (!hoverSelect) return;
        deselect(eM.getSource());
    }

    // (知) First time I'm using these two..!

    public void
    keyPressed(KeyEvent eK)
    {
        if (eK.getKeyCode() != KeyEvent.VK_ENTER) return;

        PostPreviewComponent selected = null;
        for (PostPreviewComponent c: postPreviews)
            if (c.getSelected()) selected = c;

        if (selected == null) return;
        open(selected);
    }

    public void
    actionPerformed(ActionEvent eA)
    {
        Object src = eA.getSource();

        if (src == next) primaire.nextPage();
        else if (src == prev) primaire.previousPage();
        /*
        * I think the page previews will just forward to us.
        * But I think they'll have to tell us where they are
        * in the list somehow, because we need to show only
        * one post as selected.
        */
    }


    public void
    mousePressed(MouseEvent eM) { }

    public void
    mouseReleased(MouseEvent eM) { }

    public void
    keyTyped(KeyEvent eK) { }

    public void
    keyReleased(KeyEvent eK) { }

//	 -	-%-	 -

	public static String
	textApproximation(String html)
	{
		StringBuilder returnee = new StringBuilder();
		Tree<String> nodes = RudimentaryHTMLParser.depthlessRead(html);
		if (nodes.size() == 0) return "-";
		Tree<String> first = nodes.get(0);
		for (Tree<String> node: nodes)
		{
			if (node.key.equals("tag"))
			{
				if (node.get(0).key.equals("br"))
					returnee.append("; ");
				if (node.get(0).key.equals("p") && node != first)
					returnee.append("; ");
			}
			if (node.key.equals("emoji"))
			{
				returnee.append(":" + node.value + ":");
			}
			if (node.key.equals("text"))
			{
				returnee.append(node.value);
			}
		}
		return returnee.toString();
	}
//  ---%-@-%---

    TimelineComponent(TimelineWindow primaire)
    {
        this.primaire = primaire;

        postPreviews = new ArrayList<>(PREVIEW_COUNT);
        hoverSelect = true;

        prev = new JButton("<");
        next = new JButton(">");
        prev.setEnabled(false);
        next.setEnabled(false);
        prev.setMnemonic(KeyEvent.VK_PAGE_UP);
        next.setMnemonic(KeyEvent.VK_PAGE_DOWN);
        prev.addActionListener(this);
        next.addActionListener(this);

        pageLabel = new JLabel("0");

        Box bottom = Box.createHorizontalBox();
        bottom.add(Box.createGlue());
        bottom.add(prev);
        bottom.add(Box.createHorizontalStrut(8));
        bottom.add(next);

        JPanel centre = new JPanel();
        centre.setOpaque(false);
        centre.setLayout(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.fill = GridBagConstraints.HORIZONTAL;
        constraints.gridx = 0;
        constraints.weightx = 1;
        constraints.insets = new Insets(4, 0, 4, 0);
        for (int n = PREVIEW_COUNT; n > 0; --n)
        {
            PostPreviewComponent c = new PostPreviewComponent();
            c.reset();
            c.addMouseListener(this);
            c.addFocusListener(this);
            c.addKeyListener(this);
            centre.add(c, constraints);
            postPreviews.add(c);
        }

        setLayout(new BorderLayout());
        add(centre, BorderLayout.CENTER);
        add(bottom, BorderLayout.SOUTH);

        setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
    }

}



class
PostPreviewComponent extends JComponent {

    private JLabel
    topLeft, topRight, bottom;

	private boolean
	selected;

//  ---%-@-%---

    public void
    setTopLeft(String text) { topLeft.setText(text); }

    public void
    setTopRight(String text) { topRight.setText(text); }

    public void
    setBottom(String text) { bottom.setText(text); }

	public void
    reset()
    {
        setTopLeft(" ");
        setTopRight(" ");
        setBottom(" ");
    }

    public void
    setSelected(boolean selected)
    {
		this.selected = selected;
        if (!selected) setBackground(null);
        else setBackground(new Color(0, 0, 0, 25));
    }

    public boolean
    getSelected() { return selected; }

//     -    -%-     -

    protected void
    paintComponent(Graphics g)
    {
		if (selected) {
        	g.setColor(getBackground());
        	g.fillRect(0, 0, getWidth(), getHeight());
		}
    }

//  ---%-@-%---

    public
    PostPreviewComponent()
    {
        Font f = new JLabel().getFont();
        Font f1 = f.deriveFont(Font.PLAIN, 12f);
        Font f2 = f.deriveFont(Font.ITALIC, 12f);
        Font f3 = f.deriveFont(Font.PLAIN, 14f);

        topLeft = new JLabel();
        topLeft.setFont(f1);
        topLeft.setOpaque(false);

        topRight = new JLabel();
        topRight.setHorizontalAlignment(JLabel.RIGHT);
        topRight.setFont(f2);
        topRight.setOpaque(false);

        Box top = Box.createHorizontalBox();
        top.setOpaque(false);
        top.add(topLeft);
        top.add(Box.createGlue());
        top.add(topRight);

		bottom = new JLabel();
        bottom.setFont(f3);
        bottom.setOpaque(false);

		JPanel left = new JPanel();
		left.setOpaque(false);
		left.setLayout(new BorderLayout());
        left.add(top, BorderLayout.NORTH);
        left.add(bottom);

        setFocusable(true);
        setOpaque(false);
		setLayout(new BorderLayout());
		add(left);
    }

}