// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui.layer.geoimage;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.net.MalformedURLException;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.time.Instant;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.function.Supplier;

import org.openstreetmap.josm.data.coor.ILatLon;
import org.openstreetmap.josm.data.gpx.TimeSource;
import org.openstreetmap.josm.data.imagery.street_level.IImageEntry;
import org.openstreetmap.josm.data.imagery.street_level.Projections;
import org.openstreetmap.josm.tools.HttpClient;
import org.openstreetmap.josm.tools.JosmRuntimeException;

/**
 * A remote image entry
 * @since 18592
 */
public class RemoteEntry implements IImageEntry<RemoteEntry>, ImageMetadata {
    private final URI uri;
    private final Supplier<RemoteEntry> firstImage;
    private final Supplier<RemoteEntry> nextImage;
    private final Supplier<RemoteEntry> previousImage;
    private final Supplier<RemoteEntry> lastImage;
    private int width;
    private int height;
    private ILatLon pos;
    private Integer exifOrientation;
    private Double elevation;
    private Integer gpsDiffMode;
    private Integer gps2d3dMode;
    private Double exifHPosErr;
    private Double exifGpsDop;
    private String exifGpsDatum;
    private String exifGpsProcMethod;
    private Double speed;
    private Double exifImgDir;
    private Double exifGpsTrack;
    private ILatLon exifCoor;
    private Instant exifTime;
    private Instant exifGpsTime;
    private Instant gpsTime;
    private String iptcObjectName;
    private List<String> iptcKeywords;
    private String iptcHeadline;
    private String iptcCaption;
    private Projections projection;
    private String title;

    /**
     * Create a new remote entry
     * @param uri The URI to use
     * @param firstImage first image supplier
     * @param nextImage next image supplier
     * @param lastImage last image supplier
     * @param previousImage previous image supplier
     */
    public RemoteEntry(URI uri, Supplier<RemoteEntry> firstImage, Supplier<RemoteEntry> previousImage,
                       Supplier<RemoteEntry> nextImage, Supplier<RemoteEntry> lastImage) {
        Objects.requireNonNull(uri);
        Objects.requireNonNull(firstImage);
        Objects.requireNonNull(previousImage);
        Objects.requireNonNull(nextImage);
        Objects.requireNonNull(lastImage);
        this.uri = uri;
        this.firstImage = firstImage;
        this.previousImage = previousImage;
        this.nextImage = nextImage;
        this.lastImage = lastImage;
    }

    @Override
    public RemoteEntry getNextImage() {
        return this.nextImage.get();
    }

    @Override
    public RemoteEntry getPreviousImage() {
        return this.previousImage.get();
    }

    @Override
    public RemoteEntry getFirstImage() {
        return this.firstImage.get();
    }

    @Override
    public RemoteEntry getLastImage() {
        return this.lastImage.get();
    }

    @Override
    public String getDisplayName() {
        return this.title == null ? this.getImageURI().toString() : this.title;
    }

    @Override
    public void setWidth(int width) {
        this.width = width;
    }

    @Override
    public void setHeight(int height) {
        this.height = height;
    }

    @Override
    public void setPos(ILatLon pos) {
        this.pos = pos;
    }

    @Override
    public void setSpeed(Double speed) {
        this.speed = speed;
    }

    /**
     * @since 19387
     */
    @Override
    public void setGpsDiffMode(Integer gpsDiffMode) {
        this.gpsDiffMode = gpsDiffMode;
    }

    /**
     * @since 19387
     */
    @Override
    public void setGps2d3dMode(Integer gps2d3dMode) {
        this.gps2d3dMode = gps2d3dMode;
    }

    /**
     * @since 19387
     */
    @Override
    public void setExifGpsDatum(String exifGpsDatum) {
        this.exifGpsDatum = exifGpsDatum;
    }

    /**
     * @since 19387
     */
    @Override
    public void setExifGpsProcMethod(String exifGpsProcMethod) {
        this.exifGpsProcMethod = exifGpsProcMethod;
    }

    @Override
    public void setElevation(Double elevation) {
        this.elevation = elevation;
    }

    @Override
    public void setExifOrientation(Integer exifOrientation) {
        this.exifOrientation = exifOrientation;
    }

    @Override
    public void setExifTime(Instant exifTime) {
        this.exifTime = exifTime;
    }

    @Override
    public void setExifGpsTime(Instant exifGpsTime) {
        this.exifGpsTime = exifGpsTime;
    }

    @Override
    public void setGpsTime(Instant gpsTime) {
        this.gpsTime = gpsTime;
    }

    @Override
    public void setExifCoor(ILatLon exifCoor) {
        this.exifCoor = exifCoor;
    }

    @Override
    public void setExifImgDir(Double exifDir) {
        this.exifImgDir = exifDir;
    }

    /**
     * @since 19387
     */
    @Override
    public void setExifGpsTrack(Double exifGpsTrack) {
        this.exifGpsTrack = exifGpsTrack;
    }

    /**
     * @since 19387
     */
    @Override
    public void setExifHPosErr(Double exifHPosError) {
        this.exifHPosErr = exifHPosError;
    }

    /**
     * @since 19387
     */
    @Override
    public void setExifGpsDop(Double exifGpsDop) {
        this.exifGpsDop = exifGpsDop;
    }

    @Override
    public void setIptcCaption(String iptcCaption) {
        this.iptcCaption = iptcCaption;
    }

    @Override
    public void setIptcHeadline(String iptcHeadline) {
        this.iptcHeadline = iptcHeadline;
    }

    @Override
    public void setIptcKeywords(List<String> iptcKeywords) {
        this.iptcKeywords = iptcKeywords;
    }

    @Override
    public void setIptcObjectName(String iptcObjectName) {
        this.iptcObjectName = iptcObjectName;
    }

    @Override
    public Integer getExifOrientation() {
        return this.exifOrientation != null ? this.exifOrientation : 1;
    }

    @Override
    public File getFile() {
        return null;
    }

    @Override
    public URI getImageURI() {
        return this.uri;
    }

    @Override
    public int getWidth() {
        return this.width;
    }

    @Override
    public int getHeight() {
        return this.height;
    }

    @Override
    public ILatLon getPos() {
        return this.pos;
    }

    @Override
    public Double getSpeed() {
        return this.speed;
    }

    @Override
    public Double getElevation() {
        return this.elevation;
    }

    /**
     * @since 19387
     */
    @Override
    public Integer getGpsDiffMode() {
        return this.gpsDiffMode;
    }
    
    /**
     * @since 19387
     */
    @Override
    public Integer getGps2d3dMode() {
        return this.gps2d3dMode;
    }

    /**
     * @since 19387
     */
    @Override
    public String getExifGpsDatum() {
        return this.exifGpsDatum;
    }

    /**
     * @since 19387
     */
    @Override
    public String getExifGpsProcMethod() {
        return this.exifGpsProcMethod;
    }

    /**
     * @since 19387
     */
    @Override
    public Double getExifImgDir() {
        return this.exifImgDir;
    }

    /**
     * @since 19387
     */
    @Override
    public Double getExifGpsTrack() {
        return this.exifGpsTrack;
    }

    /**
     * @since 19387
     */
    @Override
    public Double getExifHPosErr() {
        return this.exifHPosErr;
    }

    /**
     * @since 19387
     */
    @Override
    public Double getExifGpsDop() {
        return this.exifGpsDop;
    }

    @Override
    public Instant getLastModified() {
        if ("file".equals(this.getImageURI().getScheme())) {
            try {
                return Files.getLastModifiedTime(Paths.get(this.getImageURI())).toInstant();
            } catch (IOException e) {
                throw new UncheckedIOException(e);
            }
        }
        try {
            return Instant.ofEpochMilli(HttpClient.create(this.getImageURI().toURL(), "HEAD").getResponse().getLastModified());
        } catch (MalformedURLException e) {
            throw new JosmRuntimeException(e);
        }
    }

    @Override
    public boolean hasExifTime() {
        return this.exifTime != null;
    }

    @Override
    public Instant getTimeSourceInstant(TimeSource timeSource) {
        return this.getTimeSourceInstant(timeSource);
    }

    @Override
    public Instant getExifGpsInstant() {
        return this.exifGpsTime;
    }

    @Override
    public boolean hasExifGpsTime() {
        return this.exifGpsTime != null;
    }

    @Override
    public ILatLon getExifCoor() {
        return this.exifCoor;
    }

    @Override
    public Instant getExifInstant() {
        return this.exifTime;
    }

    @Override
    public boolean hasGpsTime() {
        return this.gpsTime != null;
    }

    @Override
    public Instant getGpsInstant() {
        return this.gpsTime;
    }

    @Override
    public String getIptcCaption() {
        return this.iptcCaption;
    }

    @Override
    public String getIptcHeadline() {
        return this.iptcHeadline;
    }

    @Override
    public List<String> getIptcKeywords() {
        return this.iptcKeywords;
    }

    @Override
    public String getIptcObjectName() {
        return this.iptcObjectName;
    }

    @Override
    public Projections getProjectionType() {
        return this.projection;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        final URI u = getImageURI();
        if (u.getScheme().contains("file")) {
            return Files.newInputStream(Paths.get(u));
        }
        final HttpClient client = HttpClient.create(u.toURL());
        InputStream actual = client.connect().getContent();
        return new BufferedInputStream(actual) {
            @Override
            public void close() throws IOException {
                try {
                    super.close();
                } finally {
                    client.disconnect();
                }
            }
        };
    }

    @Override
    public void selectImage(ImageViewerDialog imageViewerDialog, IImageEntry<?> entry) {
        imageViewerDialog.displayImages(Collections.singletonList(entry));
    }

    @Override
    public void setProjectionType(Projections newProjection) {
        this.projection = newProjection;
    }

    /**
     * Set the display name for this entry
     * @param text The display name
     */
    public void setDisplayName(String text) {
        this.title = text;
    }

    @Override
    public int hashCode() {
        return Objects.hash(this.uri, this.pos,
                this.exifOrientation, this.elevation, this.speed, this.exifImgDir,
                this.exifGpsTrack, this.exifCoor, this.exifTime, this.exifGpsTime,
                this.gpsTime, this.exifHPosErr, this.exifGpsDop, this.gpsDiffMode,
                this.gps2d3dMode, this.exifGpsDatum, this.exifGpsProcMethod,
                this.iptcObjectName, this.iptcCaption, this.iptcHeadline,
                this.iptcKeywords, this.projection, this.title);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj != null && obj.getClass() == this.getClass()) {
            RemoteEntry other = this.getClass().cast(obj);
            return Objects.equals(this.uri, other.uri)
                    && Objects.equals(this.elevation, other.elevation)
                    && Objects.equals(this.exifCoor, other.exifCoor)
                    && Objects.equals(this.exifGpsTime, other.exifGpsTime)
                    && Objects.equals(this.exifImgDir, other.exifImgDir)
                    && Objects.equals(this.exifGpsTrack, other.exifGpsTrack)
                    && Objects.equals(this.exifHPosErr, other.exifHPosErr)
                    && Objects.equals(this.exifGpsDop, other.exifGpsDop)
                    && Objects.equals(this.exifOrientation, other.exifOrientation)
                    && Objects.equals(this.exifTime, other.exifTime)
                    && Objects.equals(this.gpsTime, other.gpsTime)
                    && Objects.equals(this.iptcCaption, other.iptcCaption)
                    && Objects.equals(this.iptcHeadline, other.iptcHeadline)
                    && Objects.equals(this.iptcKeywords, other.iptcKeywords)
                    && Objects.equals(this.iptcObjectName, other.iptcObjectName)
                    && Objects.equals(this.pos, other.pos)
                    && Objects.equals(this.projection, other.projection)
                    && Objects.equals(this.speed, other.speed)
                    && Objects.equals(this.gpsDiffMode, other.gpsDiffMode)
                    && Objects.equals(this.gps2d3dMode, other.gps2d3dMode)
                    && Objects.equals(this.exifGpsDatum, other.exifGpsDatum)
                    && Objects.equals(this.exifGpsProcMethod, other.exifGpsProcMethod)
                    && Objects.equals(this.title, other.title);
        }
        return false;
    }
}