// FILIUS' „Report“ in the documentation mode measured (ReportGenerator):
// each project opened as the menu opens it, run for a while when asked (its
// frames in FILIUS' packet log, the Lauscher, as after a simulation), then
// the PDF Java writes, read back with iText's own parser: its pages and
// their size, every piece of text with its place, font, size and colour,
// every image with its place and size, the document's title and creator;
// and what the report was made of (the Lauscher's cards, the nodes' cards).
// An empty project too (no file). The reference for the editor's report
// (packages/editor/test/report.test.ts).
//
// Usage: java -cp filius.jar:lib/*:classes ReportRun <out.json> <pdf folder> <file.fls>[:<milliseconds to run>]...
//        java -cp filius.jar:lib/*:classes ReportRun --read <out.json> <file.pdf>...   (a PDF read back alone, with its SHA-256)

import com.itextpdf.text.BaseColor;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.parser.GraphicsState;
import com.itextpdf.text.pdf.parser.ImageRenderInfo;
import com.itextpdf.text.pdf.parser.Matrix;
import com.itextpdf.text.pdf.parser.PdfReaderContentParser;
import com.itextpdf.text.pdf.parser.RenderListener;
import com.itextpdf.text.pdf.parser.TextRenderInfo;
import com.itextpdf.text.pdf.parser.Vector;
import filius.gui.GUIContainer;
import filius.gui.documentation.ReportGenerator;
import filius.gui.netzwerksicht.GUIKnotenItem;
import filius.hardware.NetzwerkInterface;
import filius.hardware.knoten.InternetKnoten;
import filius.rahmenprogramm.Information;
import filius.rahmenprogramm.SzenarioVerwaltung;
import filius.rahmenprogramm.nachrichten.Lauscher;

import java.io.File;
import java.io.FileOutputStream;
import java.lang.reflect.Field;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.swing.SwingUtilities;

public class ReportRun {
    static float round(float value) {
        return Math.round(value * 100) / 100f;
    }

    static String colour(BaseColor color) {
        return color == null ? null : color.getRed() + "," + color.getGreen() + "," + color.getBlue();
    }

    /** Every piece of text and every image of a page, in the order the page draws them. */
    static class Listener implements RenderListener {
        final List<Object> texts = new ArrayList<>();
        final List<Object> images = new ArrayList<>();

        public void beginTextBlock() {}

        public void endTextBlock() {}

        public void renderText(TextRenderInfo info) {
            // Spaces alone (iText writes the ends of lines and Chunk.NEWLINE so) carry nothing.
            if (info.getText().trim().isEmpty()) return;
            try {
                Field field = TextRenderInfo.class.getDeclaredField("gs");
                field.setAccessible(true);
                GraphicsState state = (GraphicsState) field.get(info);
                Vector start = info.getBaseline().getStartPoint();
                // x|y|font|size|colour|text, one string a piece, so that the file stays small.
                texts.add(round(start.get(Vector.I1)) + "|" + round(start.get(Vector.I2)) + "|" + info.getFont().getPostscriptFontName() + "|"
                        + round(state.getFontSize()) + "|" + colour(info.getFillColor()) + "|" + info.getText());
            } catch (ReflectiveOperationException error) {
                throw new IllegalStateException(error);
            }
        }

        public void renderImage(ImageRenderInfo info) {
            Matrix matrix = info.getImageCTM();
            Map<String, Object> image = new LinkedHashMap<>();
            image.put("x", round(matrix.get(Matrix.I31)));
            image.put("y", round(matrix.get(Matrix.I32)));
            image.put("width", round(matrix.get(Matrix.I11)));
            image.put("height", round(matrix.get(Matrix.I22)));
            try {
                image.put("pixels", List.of(info.getImage().getBufferedImage().getWidth(), info.getImage().getBufferedImage().getHeight()));
            } catch (Exception error) {
                image.put("pixels", null);
            }
            images.add(image);
        }
    }

    static Map<String, Object> read(String pdf) throws Exception {
        Map<String, Object> result = new LinkedHashMap<>();
        PdfReader reader = new PdfReader(pdf);
        Map<String, String> info = reader.getInfo();
        result.put("title", info.get("Title"));
        result.put("creator", info.get("Creator"));
        List<Object> pages = new ArrayList<>();
        PdfReaderContentParser parser = new PdfReaderContentParser(reader);
        for (int number = 1; number <= reader.getNumberOfPages(); number++) {
            Listener listener = parser.processContent(number, new Listener());
            Map<String, Object> page = new LinkedHashMap<>();
            page.put("size", List.of(round(reader.getPageSize(number).getWidth()), round(reader.getPageSize(number).getHeight())));
            page.put("texts", listener.texts);
            page.put("images", listener.images);
            pages.add(page);
        }
        result.put("pages", pages);
        reader.close();
        return result;
    }

    static Map<String, Object> measure(String name, File pdfFolder) throws Exception {
        Map<String, Object> result = new LinkedHashMap<>();
        // What the report is made of: the Lauscher's cards and every card of the nodes.
        List<Object> packetLogCards = new ArrayList<>();
        for (String id : Lauscher.getLauscher().getInterfaceIDs()) {
            Map<String, Object> card = new LinkedHashMap<>();
            card.put("mac", id);
            card.put("rows", Lauscher.getLauscher().getDaten(id, true, 0).length);
            packetLogCards.add(card);
        }
        result.put("packetLogCards", packetLogCards);
        List<Object> nodes = new ArrayList<>();
        for (GUIKnotenItem item : GUIContainer.getGUIContainer().getKnotenItems()) {
            Map<String, Object> node = new LinkedHashMap<>();
            node.put("name", item.getKnoten().holeAnzeigeName());
            node.put("type", item.getKnoten().getClass().getSimpleName());
            List<Object> macs = new ArrayList<>();
            if (item.getKnoten() instanceof InternetKnoten) {
                for (NetzwerkInterface nic : ((InternetKnoten) item.getKnoten()).getNetzwerkInterfaces()) macs.add(nic.getMac());
            }
            node.put("macs", macs);
            nodes.add(node);
        }
        result.put("nodes", nodes);
        String pdf = new File(pdfFolder, name.replace(".fls", "") + ".pdf").getPath();
        ReportGenerator.getInstance().generateReport(pdf);
        result.put("pdf", read(pdf));
        return result;
    }

    public static void main(String[] args) throws Exception {
        // FILIUS' window keeps the JVM alive: end it on any failure too.
        try {
            run(args);
        } catch (Throwable error) {
            error.printStackTrace();
            System.exit(1);
        }
        System.exit(0);
    }

    interface Step {
        void run() throws Exception;
    }

    static void onEdt(Step step) throws Exception {
        Exception[] failed = new Exception[1];
        SwingUtilities.invokeAndWait(() -> {
            try {
                step.run();
            } catch (Exception error) {
                failed[0] = error;
            }
        });
        if (failed[0] != null) throw failed[0];
    }

    static void run(String[] args) throws Exception {
        if (args[0].equals("--read")) {
            Map<String, Object> read = new LinkedHashMap<>();
            for (int index = 2; index < args.length; index++) {
                Map<String, Object> pdf = read(args[index]);
                byte[] digest = java.security.MessageDigest.getInstance("SHA-256").digest(java.nio.file.Files.readAllBytes(Path.of(args[index])));
                StringBuilder hex = new StringBuilder();
                for (byte each : digest) hex.append(String.format("%02x", each));
                pdf.put("sha256", hex.toString());
                read.put(Path.of(args[index]).getFileName().toString(), pdf);
            }
            try (FileOutputStream out = new FileOutputStream(args[1])) {
                out.write((FlsOracle.Json.write(read, "") + "\n").getBytes(StandardCharsets.UTF_8));
            }
            return;
        }
        GUIContainer.getGUIContainer();
        File pdfFolder = new File(args[1]);
        pdfFolder.mkdirs();
        Map<String, Object> output = new LinkedHashMap<>();
        Map<String, Object> projects = new LinkedHashMap<>();
        for (int index = 2; index < args.length; index++) {
            String[] parts = args[index].split(":");
            String file = parts[0];
            long runFor = parts.length > 1 ? Long.parseLong(parts[1]) : 0;
            String name = Path.of(file).getFileName().toString();
            onEdt(() -> {
                // As GUIMainMenu opens a file; the packet log starts empty, as after Lauscher.reset.
                Information.getInformation().reset();
                Lauscher.getLauscher().reset();
                SzenarioVerwaltung.getInstance().laden(file, GUIContainer.getGUIContainer().getKnotenItems(),
                        GUIContainer.getGUIContainer().getCableItems(), GUIContainer.getGUIContainer().getDocuItems());
                GUIContainer.getGUIContainer().setProperty(null);
                GUIContainer.getGUIContainer().updateViewport();
                GUIContainer.getGUIContainer().updateCables();
            });
            if (runFor > 0) {
                // As GUIMainMenu.selectMode starts and ends a simulation: every node in the window's order.
                for (GUIKnotenItem item : GUIContainer.getGUIContainer().getKnotenItems()) item.getKnoten().getSystemSoftware().starten();
                Thread.sleep(runFor);
                for (GUIKnotenItem item : GUIContainer.getGUIContainer().getKnotenItems()) item.getKnoten().getSystemSoftware().beenden();
                Thread.sleep(500);
            }
            Map<String, Object>[] measured = new Map[1];
            onEdt(() -> measured[0] = measure(name, pdfFolder));
            projects.put(name, measured[0]);
        }
        output.put("projects", projects);

        Map<String, Object>[] empty = new Map[1];
        onEdt(() -> {
            GUIContainer container = GUIContainer.getGUIContainer();
            container.getKnotenItems().clear();
            container.getCableItems().clear();
            container.getDocuItems().clear();
            SzenarioVerwaltung.getInstance().reset();
            Lauscher.getLauscher().reset();
            container.updateViewport();
            empty[0] = measure("empty.fls", pdfFolder);
        });
        output.put("empty", empty[0]);

        try (FileOutputStream out = new FileOutputStream(args[0])) {
            out.write((FlsOracle.Json.write(output, "") + "\n").getBytes(StandardCharsets.UTF_8));
        }
    }
}