using System;
using System.Threading;
using UnityEditor;
using UnityEditor.PackageManager;
using UnityEditor.PackageManager.Requests;
using UnityEngine;

namespace TapjoyEditor
{
    public static class EDMResolver
    {
        const string k_UnityMediationPackage = "com.unity.services.mediation";

        const string k_EDMPackageName = "com.google.external-dependency-manager";

        const string k_DoNotAskAgain = "Unity.Mediation.MobileDependencyResolver.DoNotAskAgain";

        const string k_DialogTitle        = "External Dependency Manager required";
        const string k_DialogText         =
            "Offerwall requires External Dependency Manager to resolve native dependencies.\n" +
            "Would you like to install it via Package Manager?";
        const string k_ButtonInstall      = "Install";
        const string k_ButtonCancel       = "Cancel";
        const string k_ButtonDontAskAgain = "Ignore - Do not ask again";

        static readonly string[] k_EDMSelectableVersions = new[] { "1.2.183", "1.2.182" };

        public static string SelectedVersion { get; set; }

        static AddRequest s_AddRequest;

        [InitializeOnLoadMethod]
        static void LoadEditorCallback() {
            EditorApplication.delayCall += PromptAndInstallEdmIfNeeded;
        }

        public static void PromptAndInstallEdmIfNeeded()
        {
            if (IsPackageInManifest(k_UnityMediationPackage))
                return;

            if (Type.GetType("Google.VersionHandler, Google.VersionHandler") != null)
                return;

            if (EditorPrefs.GetBool(k_DoNotAskAgain))
                return;

            int result = EditorUtility.DisplayDialogComplex(
                k_DialogTitle,
                k_DialogText,
                k_ButtonInstall,
                k_ButtonCancel,
                k_ButtonDontAskAgain);

            switch (result) {
                case 0:
                    EDMSelectionEditorWindow.ShowWindow(selectedVersion => {
                        SelectedVersion = selectedVersion;
                        if (string.IsNullOrEmpty(SelectedVersion))
                            return;

                        EditorApplication.delayCall += () => {
                            StartUpmInstallWithVersion(SelectedVersion);
                        };
                    }, k_EDMSelectableVersions);
                    break;
                case 1:
                    break;
                case 2:
                    EditorPrefs.SetBool(k_DoNotAskAgain, true);
                    break;
            }
        }

        static bool IsPackageInManifest(string pkgName) {
            try {
                var manifest = System.IO.File.ReadAllText("Packages/manifest.json");
                return manifest.Contains($"\"{pkgName}\"");
            }
            catch (Exception) {
                Debug.LogWarning("[Tapjoy] Could not read Packages/manifest.json");
                return false;
            }
        }

        static void StartUpmInstallWithVersion(string versionOrTag) {
            if (string.IsNullOrEmpty(versionOrTag))
                return;

            EditorApplication.quitting += () => EditorPrefs.DeleteKey(k_DoNotAskAgain);

            var gitUrl = BuildEdmGitUrl(versionOrTag);
            s_AddRequest = Client.Add(gitUrl);
            EditorApplication.update += Progress;
        }

        static string BuildEdmGitUrl(string versionOrTag) {
            if (string.IsNullOrEmpty(versionOrTag)) {
                var fallbackVersion = (k_EDMSelectableVersions != null && k_EDMSelectableVersions.Length > 0)
                    ? k_EDMSelectableVersions[0]
                    : null;

                if (string.IsNullOrEmpty(fallbackVersion))
                    throw new InvalidOperationException("No selectable EDM version is available.");

                versionOrTag = fallbackVersion;
            }

            var tag = versionOrTag.StartsWith("v", StringComparison.Ordinal)
                ? versionOrTag
                : "v" + versionOrTag;

            return "https://github.com/googlesamples/unity-jar-resolver.git?path=/upm#" + tag;
        }

        static void Progress() {
            if (!s_AddRequest.IsCompleted)
                return;

            EditorApplication.update -= Progress;

            if (s_AddRequest.Status == StatusCode.Success) {
                Debug.Log($"[Tapjoy] External Dependency Manager installed: {s_AddRequest.Result.packageId}");
            }
            else {
                string err = s_AddRequest.Error?.message ?? "Unknown error";
                Debug.LogError($"[Tapjoy] Failed to install EDM: {err}");
                EditorUtility.DisplayDialog("EDM Install Failed", err, "OK");
            }
        }

        public static int InstallEdmViaUpmHeadless() {
            if (IsPackageInManifest(k_EDMPackageName) ||
                Type.GetType("Google.VersionHandler, Google.VersionHandler") != null) {
                Debug.Log("[Tapjoy] EDM already present. Skipping UPM install.");
                return 0;
            }

            AddRequest request;
            try {
                var headlessGitUrl = BuildEdmGitUrl(null);
                request = Client.Add(headlessGitUrl);
            }
            catch (Exception ex) {
                Debug.LogError($"[Tapjoy] Exception starting EDM UPM install: {ex}");
                EditorApplication.Exit(1);
                return 1;
            }

            var start = DateTime.UtcNow;
            const int timeoutSeconds = 300;
            while (!request.IsCompleted) {
                if ((DateTime.UtcNow - start).TotalSeconds > timeoutSeconds) {
                    Debug.LogError("[Tapjoy] EDM UPM install timed out.");
                    EditorApplication.Exit(1);
                    return 1;
                }
                Thread.Sleep(100);
            }

            if (request.Status == StatusCode.Success) {
                Debug.Log($"[Tapjoy] External Dependency Manager installed via UPM: {request.Result.packageId}");
                return 0;
            }
            else {
                string err = request.Error?.message ?? "Unknown error";
                Debug.LogError($"[Tapjoy] Failed to install EDM via UPM: {err}");
                EditorApplication.Exit(1);
                return 1;
            }
        }
    }
}