using System;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.Networking;

namespace Unity.Services.Mediation.Dashboard.Editor
{
    static class DashboardClient
    {
        const string k_ErrorProjectNotConfigured        = "To access the full suite of Mediation Editor tools, please link your project to a Unity Dashboard project under Edit > Project Settings > Services";
        const string k_ErrorFailedToRetrieveAdUnits     = "Failed to retrieve Ad Units from the Dashboard; ";
        const string k_ErrorFailedToRetrieveGameId      = "Failed to retrieve Game IDs from the Dashboard; ";
        const string k_ErrorFailedToRetrieveAdNetworks  = "Failed to retrieve Configured ad Networks from the Dashboard; ";
        const string k_AdUnitsListUrl    = "https://services.unity.com/api/monetize/mediation/v1/organizations/{0}/projects/{1}/ad-units";
        const string k_GameIdUrl         = "https://services.unity.com/api/monetize/mediation/v1/organizations/{0}/projects/{1}/app-adnetwork-parameters/{2}";
        const string k_AdNetworksListUrl = "https://services.unity.com/api/monetize/mediation/v1/organizations/{0}/ad-networks";
        const string k_AdNetworkUnity = "UNITY";

        static DashboardPoller s_ProjectSettingsPoller;
        static DashboardPoller s_NoTimeoutPoller;

        static DashboardClient()
        {
            s_ProjectSettingsPoller = new DashboardPoller(IsCloudProjectSettingsValid);
            s_NoTimeoutPoller = new DashboardPoller(IsCloudProjectSettingsValid, 1.0, Int32.MaxValue);
        }

        static bool IsCloudProjectSettingsValid()
        {
            return !string.IsNullOrEmpty(CloudProjectSettings.projectId)
                && !string.IsNullOrEmpty(CloudProjectSettings.userId)
                && !string.IsNullOrEmpty(CloudProjectSettings.accessToken)
                && !string.IsNullOrEmpty(Core.Editor.OrganizationHandler.OrganizationProvider.Organization.Key);
        }

        /// <summary>
        /// Validates that the Cloud project settings are properly set so we can access the Dashboard
        /// </summary>
        /// <returns>True if we have the proper info to access the dashboard</returns>
        static void IsProjectReadyForConfigurationRequests(Action<bool> callback)
        {
            var isCloudProjectSettingsValid = IsCloudProjectSettingsValid();
            if (isCloudProjectSettingsValid || s_ProjectSettingsPoller.FinishedPolling)
            {
                callback?.Invoke(isCloudProjectSettingsValid);
            }
            else
            {
                s_ProjectSettingsPoller.AddCallback(callback);
            }
        }

        /// <summary>
        /// Retrieves the request token and sets it in the unity web request's header
        /// </summary>
        /// <param name="request">The web request to fill</param>
        /// <param name="onRequestReady">Callback when the token is set</param>
        static void PrepareRequestToken(UnityWebRequest request, Action onRequestReady)
        {
            request.downloadHandler = new DownloadHandlerBuffer();
            request.SetRequestHeader("Content-Type", "application/json");

            JwtToken.GetTokenAsync(token =>
            {
                request.SetRequestHeader("Authorization", $"Bearer {token}");
                onRequestReady?.Invoke();
            });
        }

        /// <summary>
        /// Returns an array of available Ad Units asynchronously
        /// </summary>
        /// <param name="callback">Called upon completion, with an array of ad units or null if we failed.</param>
        internal static void GetAdUnitsAsync(Action<AdUnitInfoJson[]> callback)
        {
            IsProjectReadyForConfigurationRequests(ready =>
            {
                if (ready)
                {
                    var orgId = Core.Editor.OrganizationHandler.OrganizationProvider.Organization.Key;
                    var dashboardUri = new Uri(string.Format(k_AdUnitsListUrl, orgId, CloudProjectSettings.projectId));
                    var dashboardRequest = new UnityWebRequest(dashboardUri, UnityWebRequest.kHttpVerbGET);

                    PrepareRequestToken(dashboardRequest, () =>
                    {
                        var requestAsyncOperation = dashboardRequest.SendWebRequest();
                        requestAsyncOperation.completed += _ => OnAdUnitsInfoReady(dashboardRequest, callback);
                    });
                }
                else
                {
                    MediationLogger.LogWarning(k_ErrorProjectNotConfigured);
                    callback?.Invoke(null);
                    return;
                }
            });
        }

        internal static void OnAdUnitsInfoReady(UnityWebRequest request, Action<AdUnitInfoJson[]> callback)
        {
#if UNITY_2020_1_OR_NEWER
            var isSuccess = request.result == UnityWebRequest.Result.Success;
#else
            var isSuccess = !request.isNetworkError && !request.isHttpError;
#endif
            if (!isSuccess)
            {
                MediationLogger.LogWarning($"{k_ErrorFailedToRetrieveAdUnits} {request.error}");
                callback?.Invoke(null);
                return;
            }

            var adUnitInfos = JsonUtilityExtension.FromJsonArray<AdUnitInfoJson>(request.downloadHandler.text);

            callback?.Invoke(adUnitInfos);
        }

        /// <summary>
        /// Returns the game Id, asynchronously
        /// </summary>
        /// <param name="callback">Called upon completion, with a dictionary of platform:gameId or null if we failed</param>
        internal static void GetGameIdAsync(Action<Dictionary<string, string>> callback)
        {
            IsProjectReadyForConfigurationRequests(ready =>
            {
                if (ready)
                {
                    var orgId = Core.Editor.OrganizationHandler.OrganizationProvider.Organization.Key;
                    var dashboardUri = new Uri(string.Format(k_GameIdUrl, orgId, CloudProjectSettings.projectId, k_AdNetworkUnity));
                    var dashboardRequest = new UnityWebRequest(dashboardUri, UnityWebRequest.kHttpVerbGET);

                    PrepareRequestToken(dashboardRequest, () =>
                    {
                        var requestAsyncOperation = dashboardRequest.SendWebRequest();
                        requestAsyncOperation.completed += _ => OnGameIdReady(dashboardRequest, callback);
                    });
                }
                else
                {
                    MediationLogger.LogWarning(k_ErrorProjectNotConfigured);
                    callback?.Invoke(null);
                    return;
                }
            });
        }

        internal static void GetGameIdAsyncOrWait(Action<Dictionary<string, string>> callback)
        {
            if (!IsCloudProjectSettingsValid())
            {
                s_NoTimeoutPoller.AddCallback((success) => GetGameIdAsync(callback));
            }
            else
            {
                GetGameIdAsync(callback);
            }
        }

        static void OnGameIdReady(UnityWebRequest request, Action<Dictionary<string, string>> callback)
        {
#if UNITY_2020_1_OR_NEWER
            var isSuccess = request.result == UnityWebRequest.Result.Success;
#else
            var isSuccess = !request.isNetworkError && !request.isHttpError;
#endif

            if (!isSuccess)
            {
                //Here a 404 means the ad network is not associated with a waterfall, so the id is not available.
                if (request.responseCode != 404)
                {
                    MediationLogger.LogWarning($"{k_ErrorFailedToRetrieveGameId} {request.error}");
                }

                callback?.Invoke(null);
                return;
            }

            var projectInfo = JsonUtilityExtension.FromJsonArray<ProjectInfoJson>(request.downloadHandler.text);
            var gameIdPerPlatform = new Dictionary<string, string>();
            foreach (var project in projectInfo)
            {
                gameIdPerPlatform.Add(project.Platform, project.Params.GameId);
            }

            callback?.Invoke(gameIdPerPlatform);
        }

        /// <summary>
        /// Returns the list of configured and enabled ad networks, asynchronously
        /// </summary>
        /// <param name="callback">Called upon completion, with an array of ad networks or null if we failed</param>
        internal static void GetConfiguredAdNetworksAsync(Action<List<string>> callback)
        {
            IsProjectReadyForConfigurationRequests(ready =>
            {
                if (ready)
                {
                    var orgId = Core.Editor.OrganizationHandler.OrganizationProvider.Organization.Key;
                    var dashboardUri = new Uri(string.Format(k_AdNetworksListUrl, orgId));
                    var dashboardRequest = new UnityWebRequest(dashboardUri, UnityWebRequest.kHttpVerbGET);

                    PrepareRequestToken(dashboardRequest, () =>
                    {
                        var requestAsyncOperation = dashboardRequest.SendWebRequest();
                        requestAsyncOperation.completed += _ => OnConfiguredAdNetworksReady(dashboardRequest, callback);
                    });
                }
                else
                {
                    MediationLogger.LogWarning(k_ErrorProjectNotConfigured);
                    callback?.Invoke(null);
                }
            });
        }

        internal static void GetConfiguredAdNetworksAsyncOrWait(Action<List<string>> callback)
        {
            if (!IsCloudProjectSettingsValid())
            {
                s_NoTimeoutPoller.AddCallback((success) => GetConfiguredAdNetworksAsync(callback));
            }
            else
            {
                GetConfiguredAdNetworksAsync(callback);
            }
        }

        static void OnConfiguredAdNetworksReady(UnityWebRequest request, Action<List<string>> callback)
        {
#if UNITY_2020_1_OR_NEWER
            var isSuccess = request.result == UnityWebRequest.Result.Success;
#else
            var isSuccess = !request.isNetworkError && !request.isHttpError;
#endif

            if (!isSuccess)
            {
                MediationLogger.LogWarning($"{k_ErrorFailedToRetrieveAdNetworks} {request.error}");
                callback?.Invoke(null);
                return;
            }

            AdNetworksInfoJson[] projectInfo = JsonUtilityExtension.FromJsonArray<AdNetworksInfoJson>(request.downloadHandler.text);
            var activeAdNetworks = new List<string>();
            foreach (var network in projectInfo)
            {
                if (!network.IsDisabled)
                {
                    activeAdNetworks.Add(network.name);
                }
            }
            callback?.Invoke(activeAdNetworks);
        }

        [System.Serializable]
        internal class OrgInfoJson
        {
            public string org_foreign_key;
            public string BackendId => org_foreign_key;
        }

        [System.Serializable]
        internal class AdNetworksInfoJson
        {
            public string coreOrganizationId;
            public string CoreOrganizationId => coreOrganizationId;

            public string name;
            public string Name => name;

            public bool isDisabled;
            public bool IsDisabled => isDisabled;

            public bool? isValidated;
            public bool? IsValidated => isValidated;

            public string validatedAt;
            public string ValidatedAt => validatedAt;
        }

        [System.Serializable]
        internal class ProjectInfoJson
        {
            [System.Serializable]
            public class ProjectInfoParamsJson
            {
                public string gameId;
                public string GameId => gameId;
            }

            public string CoreOrganizationId { get; protected set; }

            public string appId;
            public string AppId => appId;

            public string projectId;
            public string ProjectId => projectId;

            public string adNetwork;
            public string AdNetwork => adNetwork;

            public string platform;
            public string Platform => platform;

            public ProjectInfoParamsJson parameters;
            public ProjectInfoParamsJson Params => parameters;
        }

        [System.Serializable]
        internal class AdUnitInfoJson
        {
            public string adUnitId;
            public string AdUnitId => adUnitId;

            public string coreOrganization;
            public string Organization => coreOrganization;

            public string adFormat;
            public string AdFormat => adFormat;

            public string platform;
            public string Platform => platform;

            public string appId;
            public string AppId => appId;

            public string name;
            public string Name => name;

            public bool isArchived;
            public bool IsArchived => isArchived;
        }
    }
}