/*
 * Modified MIT License
 *
 * Copyright 2022 OneSignal
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * 1. The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * 2. All copies of substantial portions of the Software may only be used in connection
 * with services provided by OneSignal.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

using System.Collections.Generic;
using System.IO;
using OneSignalSDK.Installer;

namespace OneSignalSDK {
    /// <summary>
    /// Representation of Manifest JSON file.
    /// Can be used for adding dependencies, scopeRegistries, etc to .json file
    /// </summary>
    public class Manifest {
        const string k_ProjectManifestPath = "Packages/manifest.json";
        const string k_DependenciesKey = "dependencies";
        const string k_ScopedRegistriesKey = "scopedRegistries";

        /// <summary>
        /// Path to manifest file.
        /// </summary>
        public string Path { get; }

        readonly Dictionary<string, ScopeRegistry> m_ScopeRegistries;
        readonly Dictionary<string, Dependency> m_Dependencies;

        Dictionary<string, object> m_RawContent;

        /// <summary>
        /// Initializes a new instance of the <see cref="Manifest"/> class.
        /// </summary>
        /// <param name="pathToFile">Path to manifest file.</param>
        public Manifest(string pathToFile = k_ProjectManifestPath) {
            Path              = pathToFile;
            m_ScopeRegistries = new Dictionary<string, ScopeRegistry>();
            m_Dependencies    = new Dictionary<string, Dependency>();
        }

        /// <summary>
        /// Read the Manifest file and deserialize its content from JSON.
        /// </summary>
        public void Fetch() {
            var manifestText = File.ReadAllText(Path);
            m_RawContent = (Dictionary<string, object>)Json.Deserialize(manifestText);

            if (m_RawContent.TryGetValue(k_ScopedRegistriesKey, out var registriesBlob)) {
                if (registriesBlob is List<object> registries) {
                    foreach (var registry in registries) {
                        var registryDict  = (Dictionary<string, object>)registry;
                        var scopeRegistry = new ScopeRegistry(registryDict);
                        m_ScopeRegistries.Add(scopeRegistry.Url, scopeRegistry);
                    }
                }
            }

            if (m_RawContent.TryGetValue(k_DependenciesKey, out var dependenciesBlob)) {
                if (dependenciesBlob is Dictionary<string, object> dependencies) {
                    foreach (var dependencyData in dependencies) {
                        var dependency = new Dependency(dependencyData.Key, dependencyData.Value.ToString());
                        m_Dependencies.Add(dependency.Name, dependency);
                    }
                }
            }
        }

        /// <summary>
        /// Returns dependency by a provided name.
        /// </summary>
        /// <param name="name">Name of the dependency.</param>
        /// <returns>Dependency with given name.</returns>
        public Dependency GetDependency(string name) {
            return m_Dependencies[name];
        }

        /// <summary>
        /// Returns scope registry by a provided url.
        /// </summary>
        /// <param name="url">Scope registry url.</param>
        /// <returns>Scope registry with the given url.</returns>
        public ScopeRegistry GetScopeRegistry(string url) {
            return m_ScopeRegistries[url];
        }

        /// <summary>
        /// Adds scope registry.
        /// </summary>
        /// <param name="registry">An entry to add.</param>
        public void AddScopeRegistry(ScopeRegistry registry) {
            if (!IsRegistryPresent(registry.Url)) {
                m_ScopeRegistries.Add(registry.Url, registry);
            }
        }

        /// <summary>
        /// Removes a scope registry
        /// </summary>
        /// <param name="url"></param>
        public void RemoveScopeRegistry(string url) {
            if (IsRegistryPresent(url)) {
                m_ScopeRegistries.Remove(url);
            }
        }

        /// <summary>
        /// Adds dependency.
        /// </summary>
        /// <param name="name">Dependency name.</param>
        /// <param name="version">Dependency version.</param>
        public void AddDependency(string name, string version) {
            if (!IsDependencyPresent(name)) {
                var dependency = new Dependency(name, version);
                m_Dependencies.Add(dependency.Name, dependency);
            }
        }

        /// <summary>
        /// Removes a dependency
        /// </summary>
        /// <param name="name"></param>
        public void RemoveDependency(string name) {
            if (IsDependencyPresent(name)) {
                m_Dependencies.Remove(name);
            }
        }

        /// <summary>
        /// Writes changes back to the manifest file.
        /// </summary>
        public void ApplyChanges() {
            var registries = new List<object>();

            foreach (var registry in m_ScopeRegistries.Values) {
                registries.Add(registry.ToDictionary());
            }

            m_RawContent[k_ScopedRegistriesKey] = registries;

            // Remove 'scopedRegistries' key from raw content if we have zero scope registries.
            // Because we don't need an empty 'scopedRegistries' key in the manifest
            if (registries.Count == 0)
                m_RawContent.Remove(k_ScopedRegistriesKey);

            Dictionary<string, object> dependencies = new Dictionary<string, object>();

            foreach (var dependency in m_Dependencies.Values) {
                dependencies.Add(dependency.Name, dependency.Version);
            }

            m_RawContent[k_DependenciesKey] = dependencies;

            string manifestText = Json.Serialize(m_RawContent, true);
            File.WriteAllText(Path, manifestText);
        }

        /// <summary>
        /// Searches for ScopeRegistry with the provided Url.
        /// </summary>
        /// <param name="url">ScopeRegistry url to search for.</param>
        /// <returns>`true` if scoped registry found, `false` otherwise.</returns>
        public bool IsRegistryPresent(string url) {
            return m_ScopeRegistries.ContainsKey(url);
        }

        /// <summary>
        /// Searches for a specific dependency by the provided name.
        /// </summary>
        /// <param name="name">The dependency name to search for.</param>
        /// <returns>`true` if found, `false` otherwise.</returns>
        public bool IsDependencyPresent(string name) {
            return m_Dependencies.ContainsKey(name);
        }
    }
}