/* copyright

This file is part of JKomasto2.
Written in 2022 by Usawashi <usawashi16@yahoo.co.jp>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.

copyright */

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import java.awt.Font;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.BorderLayout;
import java.awt.Image;
import java.awt.Graphics;
import java.util.List;
import java.util.ArrayList;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Cursor;
import java.awt.Insets;
import cafe.biskuteri.hinoki.Tree;
import java.io.IOException;
import java.awt.event.ComponentListener;
import java.awt.event.ComponentEvent;

class
NotificationsWindow extends JFrame {

    private JKomasto
    primaire;

    private List<Notification>
    notifications;

    private MastodonApi
    api;

//     -    -%-     -

    private NotificationsComponent
    display;

    private boolean
    showingLatest;

//     -    -%-     -

    private static int
    ROW_COUNT = NotificationsComponent.ROW_COUNT;

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

    public synchronized void
    readEntity(Tree<String> entity)
    {
        notifications = new ArrayList<>();
        for (Tree<String> t: entity)
        {
            Notification n = new Notification();

            n.id = t.get("id").value;

            String type = t.get("type").value;
            if (type.equals("favourite"))
                n.type = NotificationType.FAVOURITE;
            else if (type.equals("reblog"))
                n.type = NotificationType.BOOST;
            else if (type.equals("mention"))
                n.type = NotificationType.MENTION;
            else if (type.equals("follow"))
                n.type = NotificationType.FOLLOW;
            else if (type.equals("follow_request"))
                n.type = NotificationType.FOLLOWREQ;
            else if (type.equals("poll"))
                n.type = NotificationType.POLL;
            else if (type.equals("status"))
                n.type = NotificationType.ALERT;

            Tree<String> actor = t.get("account");
            String aid, aname, adisp;
            aid = actor.get("id").value;
            aname = actor.get("username").value;
            adisp = actor.get("display_name").value;
            if (!adisp.isEmpty()) n.actorName = adisp;
            else n.actorName = aname;
            n.actorNumId = aid;

            if (n.type != NotificationType.FOLLOW)
            {
                Post post = new Post(t.get("status"));
                post.resolveApproximateText();
                n.postId = post.id;
                n.postText = post.approximateText;
            }

            notifications.add(n);
        }
    }

    public void
    refresh()
    {
        String firstId = null;
        if (!showingLatest)
        {
            assert !notifications.isEmpty();
            firstId = notifications.get(0).id;
        }

        if (fetchPage(firstId, null))
        {
            if (notifications.size() < ROW_COUNT) showLatestPage();
            display.showNotifications(notifications);
            display.repaint();
        }
    }

    public void
    showLatestPage()
    {
        if (fetchPage(null, null))
        {
            display.showNotifications(notifications);
            showingLatest = true;
            primaire.getWindowUpdater().add(this);
        }
    }

    public void
    showPrevPage()
    {
        assert !notifications.isEmpty();
        if (fetchPage(null, notifications.get(0).id))
        {
            if (notifications.size() < ROW_COUNT) showLatestPage();
            display.showNotifications(notifications);
            showingLatest = false;
            primaire.getWindowUpdater().remove(this);
        }
    }

    public void
    showNextPage()
    {
        assert !notifications.isEmpty();
        int last = notifications.size() - 1;
        if (fetchPage(notifications.get(last).id, null))
        {
            display.showNotifications(notifications);
            showingLatest = false;
            primaire.getWindowUpdater().remove(this);
        }
    }

//     -    -%-     -

    private boolean
    fetchPage(String maxId, String minId)
    {
        display.setCursor(new Cursor(Cursor.WAIT_CURSOR));
        class Handler implements RequestListener {

            boolean
            succeeded = false;

    //      -=%=-

            public void
            connectionFailed(IOException eIo)
            {
                eIo.printStackTrace();
            }

            public void
            requestFailed(int httpCode, Tree<String> json)
            {
                System.err.println(httpCode + json.get("error").value);
            }

            public void
            requestSucceeded(Tree<String> json)
            {
                readEntity(json);
                succeeded = true;
            }
        }
        Handler handler = new Handler();
        api.getNotifications(ROW_COUNT, maxId, minId, handler);
        display.setCursor(null);
        repaint();
        return handler.succeeded;
    }

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

    NotificationsWindow(JKomasto primaire)
    {
        super("Notifications");
        this.primaire = primaire;
        this.api = primaire.getMastodonApi();

        notifications = new ArrayList<>();

        display = new NotificationsComponent(this);
        display.setPreferredSize(new Dimension(256, 260));
        setContentPane(display);
        pack();

        setIconImage(primaire.getProgramIcon());
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setVisible(true);
    }

}

class
NotificationsComponent extends JPanel
implements ActionListener {

    private NotificationsWindow
    primaire;

    private JButton
    prev, next;

//     -    -%-     -

    private List<NotificationComponent>
    rows;

//     -    -%-     -

    static final int
    ROW_COUNT = 10;

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

    public void
    showNotifications(List<Notification> notifications)
    {
        for (int o = 0; o < notifications.size(); ++o)
        {
            Notification n = notifications.get(o);
            NotificationComponent c = rows.get(o);
            c.setName(n.actorName);
            switch (n.type)
            {
                case MENTION: c.setType("mentioned"); break;
                case BOOST: c.setType("boosted"); break;
                case FAVOURITE: c.setType("favourited"); break;
                case FOLLOW: c.setType("followed"); break;
                case FOLLOWREQ: c.setType("req. follow"); break;
                case POLL: c.setType("poll ended"); break;
                case ALERT: c.setType("posted"); break;
            }
            c.setText(n.postText);
        }
        for (int o = notifications.size(); o < rows.size(); ++o)
        {
            NotificationComponent c = rows.get(o);
            c.setName("");
            c.setType("");
            c.setText("");
        }
        prev.setEnabled(true);
        next.setEnabled(!notifications.isEmpty());
    }

//     -    -%-     -

    public void
    actionPerformed(ActionEvent eA)
    {
        if (eA.getSource() == prev) primaire.showPrevPage();
        if (eA.getSource() == next) primaire.showNextPage();
    }

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

    NotificationsComponent(NotificationsWindow primaire)
    {
        this.primaire = primaire;

        Border b = BorderFactory.createEmptyBorder(8, 8, 8, 8);

        rows = new ArrayList<>();
        for (int n = ROW_COUNT; n > 0; --n)
            rows.add(new NotificationComponent());

        prev = new JButton("<");
        next = new JButton(">");
        prev.addActionListener(this);
        next.addActionListener(this);

        JPanel centre = new JPanel();
        centre.setLayout(new GridLayout(ROW_COUNT, 1));
        for (NotificationComponent c: rows) centre.add(c);

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

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

}

class
NotificationComponent extends JComponent
implements ComponentListener {

    private JLabel
    type;

    private ImageComponent
    typeImg;

    private JLabel
    name, text;

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

    public void
    setType(String n)
    {
        type.setText(n);
        typeImg.image = ImageApi.local(n + "Notification");
    }

    public void
    setName(String n) { name.setText(n); }

    public void
    setText(String n) { text.setText(n); }

//     -    -%-     -

    public void
    doLayout()
    {
        int w = getWidth(), h = getHeight();

        int x0 = w * 0/20;
        int x1 = w * 7/20;
        int x2 = w * 13/20;
        int x3 = w * 15/20;
        int x4 = w * 20/20;

        name.setLocation(x0 + 4, 0);
        name.setSize((x1 - 4) - (x0 + 4), h);

        type.setLocation(x1 + 4, 0);
        type.setSize((x2 - 1) - (x1 + 4), h);

        typeImg.setLocation((x2 + 1), 2);
        typeImg.setSize((x3 - 4) - (x2 + 1), (h - 2) - 2);

        text.setLocation(x3 + 4, 0);
        text.setSize((x4 - 4) - (x3 + 4), h);
    }

    public void
    componentResized(ComponentEvent eC) { doLayout(); }

    public void
    componentShown(ComponentEvent eC) { }

    public void
    componentHidden(ComponentEvent eC) { }

    public void
    componentMoved(ComponentEvent eC) { }

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

    private static class
    ImageComponent extends JComponent {

        private Image
        image,
        scaled;

        private boolean
        snapdown = false;

//        -=%=-

        protected void
        paintComponent(Graphics g)
        {
            if (image == null) return;
            int w = getWidth(), h = getHeight();

            int ow = image.getWidth(this);
            int oh = image.getHeight(this);
            int nh = h;
            int nw = ow * nh/oh;
            if (snapdown)
            {
                int sw, sh;
                for (sw = 1; sw < nw; sw *= 2);
                for (sh = 1; sh < nh; sh *= 2);
                nw = sw / 2;
                nh = sh / 2;
            }

            if (scaled == null)
                scaled = image.getScaledInstance(
                    nw, nh,
                    Image.SCALE_SMOOTH
                );
            int x = (w - nw) / 2;
            int y = (h - nh) / 2;
            g.drawImage(scaled, x, y, this);
        }

    }

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

    NotificationComponent()
    {
        Font f = new Font("Dialog", Font.PLAIN, 12);
        Font f1 = f.deriveFont(Font.PLAIN, 14);
        Font f2 = f.deriveFont(Font.PLAIN, 11);
        Font f3 = f.deriveFont(Font.ITALIC, 14);

        Color c = new Color(0, 0, 0, 25);
        Border b1 = BorderFactory.createMatteBorder(0, 0, 1, 0, c);

        name = new JLabel();
        name.setFont(f1);

        type = new JLabel();
        type.setFont(f2);
        type.setHorizontalAlignment(JLabel.RIGHT);

        typeImg = new ImageComponent();

        text = new JLabel();
        text.setFont(f3);

        setLayout(null);
        add(name);
        add(type);
        add(typeImg);
        add(text);

        this.addComponentListener(this);
        setBorder(b1);
    }

}