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/*
 * The MIT License (MIT) Copyright (c) 2020-2023 artipie.com
 * https://github.com/artipie/artipie/blob/master/LICENSE.txt
 */
package com.artipie.nuget.http.content;

import com.artipie.asto.Content;
import com.artipie.asto.Key;
import com.artipie.http.Headers;
import com.artipie.http.ResponseBuilder;
import com.artipie.http.Response;
import com.artipie.nuget.PackageIdentity;
import com.artipie.nuget.Repository;
import com.artipie.nuget.http.Resource;
import com.artipie.nuget.http.Route;
import com.artipie.nuget.http.metadata.ContentLocation;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;

/**
 * Package content route.
 * See Package Content
 */
@SuppressWarnings("deprecation")
public final class PackageContent implements Route, ContentLocation {

    /**
     * Base URL of repository.
     */
    private final URL base;

    /**
     * Repository to read content from.
     */
    private final Repository repository;

    /**
     * Ctor.
     *
     * @param base Base URL of repository.
     * @param repository Repository to read content from.
     */
    public PackageContent(final URL base, final Repository repository) {
        this.base = base;
        this.repository = repository;
    }

    @Override
    public String path() {
        return "/content";
    }

    @Override
    public Resource resource(final String path) {
        return new PackageResource(path, this.repository);
    }

    @Override
    public URL url(final PackageIdentity identity) {
        final String relative = String.format(
            "%s%s/%s",
            this.base.getPath(),
            this.path(),
            identity.nupkgKey().string()
        );
        try {
            return new URL(this.base, relative);
        } catch (final MalformedURLException ex) {
            throw new IllegalStateException(
                String.format("Failed to build URL from base: '%s'", this.base),
                ex
            );
        }
    }

    /**
     * Package content resource.
     *
     * @since 0.1
     */
    private class PackageResource implements Resource {

        /**
         * Resource path.
         */
        private final String path;

        /**
         * Repository to read content from.
         */
        private final Repository repository;

        /**
         * Ctor.
         *
         * @param path Resource path.
         * @param repository Storage to read content from.
         */
        PackageResource(final String path, final Repository repository) {
            this.path = path;
            this.repository = repository;
        }

        @Override
        public CompletableFuture get(final Headers headers) {
            return this.key().>map(
                key -> this.repository.content(key)
                    .thenApply(
                        existing -> existing.map(
                            data -> ResponseBuilder.ok().body(data).build()
                        ).orElse(ResponseBuilder.notFound().build())
                    ).toCompletableFuture()
            ).orElse(ResponseBuilder.notFound().completedFuture());
        }

        @Override
        public CompletableFuture put(Headers headers, Content body) {
            return ResponseBuilder.methodNotAllowed().completedFuture();
        }

        /**
         * Tries to build key to storage value from path.
         *
         * @return Key to storage value, if there is one.
         */
        private Optional key() {
            final String prefix = String.format("%s/", path());
            if (this.path.startsWith(prefix)) {
                return Optional.of(new Key.From(this.path.substring(prefix.length())));
            }
            return Optional.empty();
        }
    }
}