#if UNITY_IOS || UNITY_ANDROID
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using System.Collections.Generic;
using System.Linq;
using OpenWrapSDK.Common;

namespace OpenWrapSDK
{
    /// <summary>
    /// RTB's 'Data' object containing Segment details
    /// </summary>
    public class POBDataProvider
    {
        #region Private members
        // iOS/Android specific data provider client
        internal IPOBDataProviderClient dataProviderClient;
        private readonly string Tag = "POBDataProvider";

        private Dictionary<string, string> extension;
        private int segTax;
        private List<POBSegment> segments;
        #endregion

        #region Constructor/Destructor
        /// <summary>
        /// Constructor with data provider name
        /// </summary>
        /// <param name="name">Data provider's name</param>
        public POBDataProvider(string name)
        {
            if (name != null)
            {
                Name = name;
                segments = new List<POBSegment>();
                extension = new Dictionary<string, string>();
                #if UNITY_IOS
                    dataProviderClient = new iOS.POBDataProviderClient(name, null);
                #else
                    dataProviderClient = new Android.POBDataProviderClient(name);
                #endif
            }
            else
            {
                POBLog.Warning(Tag, POBLogStrings.InvalidName);
            }
        }

        /// <summary>
        /// Constructor with data provider identifier & name
        /// </summary>
        /// <param name="name">Data provider's name</param>
        /// <param name="identifier">Data provider's id</param>
        public POBDataProvider(string name, string identifier)
        {
            if (name != null && identifier != null)
            {
                Name = name;
                Identifier = identifier;
                segments = new List<POBSegment>();
                extension = new Dictionary<string, string>();
                #if UNITY_IOS
                        dataProviderClient = new iOS.POBDataProviderClient(name, identifier);
                #else
                        dataProviderClient = new Android.POBDataProviderClient(name, identifier);
                #endif
            }
            else
            {
                POBLog.Warning(Tag, POBLogStrings.InvalidNameAndId);
            }
        }

        /// <summary>
        /// Destructor
        /// </summary>
        ~POBDataProvider()
        {
            Destroy();
        }
        #endregion

        #region Internal methods
        internal void Destroy()
        {
            if (dataProviderClient != null)
            {
                dataProviderClient.Destroy();
                dataProviderClient = null;
            }

            ClearSegments();
            segments = null;

            if (extension != null)
            {
                extension.Clear();
                extension = null;
            }
        }
        #endregion

        #region Private methods
        /// <summary>
        /// Clear segments list
        /// </summary>
        private void ClearSegments()
        {
            if (segments != null && segments.Count > 0)
            {
                // Call destroy on each segment to cleanup the native instances,
                // which will prevent accessing dangling pointers in future.
                foreach (POBSegment segment in segments)
                {
                    segment.Destroy();
                }

                // Clear the local list of C# segment instances
                segments.Clear();
            }
        }
        #endregion

        #region Public APIs
        /// <summary>
        /// Data provider's identifier
        /// </summary>
        public string Identifier { get; }

        /// <summary>
        /// Data provider's name
        /// </summary>
        public string Name { get; }

        /// <summary>
        /// segment taxonomy id. Reference: https://github.com/InteractiveAdvertisingBureau/AdCOM/blob/master/AdCOM%20v1.0%20FINAL.md#list--category-taxonomies
        /// </summary>
        public int SegTax
        {
            get => segTax;
            set
            {
                segTax = value;
                if (dataProviderClient != null)
                {
                    dataProviderClient.SegTax = value;
                }
            }
        }

        /// <summary>
        /// RTB extension object for this data
        /// </summary>
        public Dictionary<string, string> Extension
        {
            get => extension;
            set
            {
                if (dataProviderClient != null && value != null)
                {
                    extension = value;
                    dataProviderClient.Extension = value;
                }
            }
        }

        /// <summary>
        /// Adds a segment details to data object
        /// </summary>
        /// <param name="segmentClient">Segment client details to be added to data object</param>
        public void AddSegment(POBSegment segment)
        {
            if (segment != null && !POBUtils.IsNullOrEmpty(segment.Identifier))
            {
                bool isDuplicate = segments.Any(seg => seg.Identifier.Equals(segment.Identifier));
                if (!isDuplicate && dataProviderClient != null)
                {
                    dataProviderClient.AddSegment(segment);

                    // Add C# segment locally
                    segments.Add(segment);
                }
                else
                {
                    POBLog.Warning(Tag, POBLogStrings.DuplicateSegmentNotAllowed);
                }
            }
            else
            {
                POBLog.Warning(Tag, POBLogStrings.InvalidSegment);
            }
        }

        /// <summary>
        /// Removes a segment details from data object
        /// </summary>
        /// <param name="identifier">Identifier for which a segment is to be removed</param>
        public void RemoveSegment(string identifier)
        {
            if (identifier != null)
            {
                if (segments.Count > 0)
                {
                    POBSegment segment = segments.Find(seg => seg.Identifier.Equals(identifier));
                    if (segment != null)
                    {
                        if (dataProviderClient != null)
                        {
                            dataProviderClient.RemoveSegment(segment);
                        }

                        _ = segments.Remove(segment);
                        segment.Destroy();
                    }
                }
            }
        }

        /// <summary>
        /// Removes all segments from the data object
        /// </summary>
        public void RemoveAllSegments()
        {
            if (dataProviderClient != null)
            {
                dataProviderClient.RemoveAllSegments();
            }
            // Clear segments
            ClearSegments();
        }

        /// <summary>
        /// Returns all the segments associated with this data object
        /// </summary>
        /// <returns>Array of POBSegmentsClients</returns>
        public List<POBSegment> GetSegments()
        {
            return segments;
        }

        /// <summary>
        /// Returns a segment for given id
        /// </summary>
        /// <param name="id">segment identifier</param>
        /// <returns>Reference of the POBSegmentClient object associated with the given identifier</returns>
        public POBSegment GetSegment(string identifier)
        {
            if (identifier != null && segments!= null && segments.Count > 0)
            {
                return segments.Find(segment => segment.Identifier.Equals(identifier));
            }
            return null;
        }
        #endregion
    }
}
#endif