using System;
using UnityEngine;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public class AnalyticsSessionState
    {
        private SessionStatus _status;

        public string SessionId { get; private set; }

        public float StartRealtimeSeconds { get; private set; }

        public int HeartbeatIndex { get; private set; }

        public int TotalBuildingsPlaced { get; private set; }

        public bool Started => _status != SessionStatus.NotStarted;

        public bool DemoCompleted => _status == SessionStatus.DemoCompleted;

        public void Begin(float realtimeSeconds)
        {
            _status = SessionStatus.Started;
            SessionId = Guid.NewGuid().ToString("N");
            StartRealtimeSeconds = realtimeSeconds;
            HeartbeatIndex = 0;
            TotalBuildingsPlaced = 0;
        }

        public bool TryRecordBuildingConstruction(BuildingDefinition definition)
        {
            if (!Started || !definition) return false;

            TotalBuildingsPlaced++;

            return true;
        }

        public bool CanRecordHouseUpgrade(Building building)
        {
            return Started && building.Definition.IsHouse;
        }

        public bool TryAdvanceHeartbeat(float realtimeSeconds, float heartbeatIntervalSeconds, out int heartbeatIndex, out float playtimeSeconds)
        {
            heartbeatIndex = 0;
            playtimeSeconds = 0;

            if (!Started || DemoCompleted) return false;

            var nextHeartbeatTime = StartRealtimeSeconds + (HeartbeatIndex + 1) * heartbeatIntervalSeconds;
            if (realtimeSeconds < nextHeartbeatTime) return false;

            heartbeatIndex = ++HeartbeatIndex;
            playtimeSeconds = GetPlaytimeSeconds(realtimeSeconds);

            return true;
        }

        public bool TryMarkDemoCompleted()
        {
            if (!Started || DemoCompleted) return false;

            _status = SessionStatus.DemoCompleted;

            return true;
        }

        public float GetPlaytimeSeconds(float realtimeSeconds)
        {
            if (!Started) return 0;

            return Mathf.Max(realtimeSeconds - StartRealtimeSeconds, 0);
        }

        private enum SessionStatus
        {
            NotStarted,

            Started,

            DemoCompleted
        }
    }
}