using System;
using System.Collections.Generic;
using System.Linq;

namespace FrameworkDAL.DTO.EIPConversation
{
    /// <summary>
    /// Unified Conversation DTO
    /// Contains:
    /// - DB conversation data
    /// - Flow configuration (Steps + Triggers)
    /// - Runtime execution context
    /// </summary>
    public class MessageHubConversationDTO
    {
        // ================================
        // PRIMARY
        // ================================
        public long MessageHubConversationId { get; set; }
        public int ClientId { get; set; }
        public int StatusId { get; set; }

        // ================================
        // PLATFORM INFO
        // ================================
        public int PlatformTypeId { get; set; }
        public string SessionId { get; set; } = string.Empty;

        // ================================
        // MESSAGE SNAPSHOT
        // ================================
        public string UserMessage { get; set; } = string.Empty;
        public string? ResponseMessage { get; set; }
        public string Recipient { get; set; } = string.Empty;
        public string MessageText { get; set; } = string.Empty;

        // ================================
        // FLOW RUNTIME
        // ================================
        public int CurrentStepId { get; set; }
        public bool IsCompleted { get; set; }

        // ================================
        // STATUS
        // ================================
        public int Status { get; set; } = 1;
        public bool IsActive { get; set; } = true;

        // ================================
        // AUDIT
        // ================================
        public int? CreatedById { get; set; }
        public int? ModifiedById { get; set; }
        public int? Version { get; set; }

        public DateTime CreatedOn { get; set; } = DateTime.UtcNow;
        public DateTime ModifiedOn { get; set; } = DateTime.UtcNow;
        public DateTime LastActivityOn { get; set; } = DateTime.UtcNow;
        public DateTime? ClosedOn { get; set; }

        // ================================
        // FLOW CONFIGURATION
        // ================================
        public string? DefaultFallbackMessage { get; set; }
        public List<ConversationFlowStepDTO> Steps { get; set; } = new();
        public List<ConversationTriggerDTO> Triggers { get; set; } = new();

        // ================================
        // RUNTIME CONTEXT
        // ================================
        public Dictionary<string, object> Context { get; set; } = new();

        // ================================
        // SAFE CONTEXT HELPERS
        // ================================
        public T? GetContextValue<T>(string key)
        {
            if (Context.TryGetValue(key, out var value))
            {
                if (value is T tValue)
                    return tValue;

                try
                {
                    return (T)Convert.ChangeType(value, typeof(T));
                }
                catch
                {
                    return default;
                }
            }

            return default;
        }

        public void SetContextValue(string key, object value)
        {
            Context[key] = value;
        }

        // ================================
        // DEBUG HELPER
        // ================================
        public string Summary =>
            $"{SessionId} | Step={CurrentStepId} | Active={IsActive} | Recipient={Recipient}";
    }

    // ============================================================
    // FLOW STEP
    // ============================================================

    public class ConversationFlowStepDTO
    {
        public int StepId { get; set; }
        public string Type { get; set; } = string.Empty;

        public string? Message { get; set; }
        public string? Response { get; set; }
        public int? DelayMilliseconds { get; set; }
        public string? ActionType { get; set; }
        public string? ActionName { get; set; }
        public string? ConditionKey { get; set; }
        public string? ConditionValue { get; set; }
        public bool? AutoAdvance { get; set; }
        public int? DefaultNextStepId { get; set; }
        public int? TrueStepId { get; set; }
        public int? FalseStepId { get; set; }

        public string? ContextKey { get; set; }
        public ValidationConfigDTO? Validation { get; set; }
        public ApiConfigDTO? ApiConfig { get; set; }

        public Dictionary<string, int> Choices { get; set; } = new();
        public Dictionary<string, int> DecisionMap { get; set; } = new();

        public string? ServiceUrl { get; set; }
        public string? Method { get; set; }
        public string? Body { get; set; }
        public Dictionary<string, string>? Headers { get; set; }
        public string? ContextKeyToSave { get; set; }

        public string? Platform { get; set; }

        public int? NextStepId { get; set; }

        // Conditional
        public List<ConditionDTO>? Conditions { get; set; }

        // Loop
        public int? MaxIterations { get; set; }
        public int? LoopBackStepId { get; set; }
        public int? ExitStepId { get; set; }

        // Advanced
        public Func<Dictionary<string, object>, int>? ConditionalNextStep { get; set; }
        public Func<Dictionary<string, object>, bool>? LoopCondition { get; set; }

        public List<ConversationButtonDTO>? Buttons { get; set; }
    }

    // ============================================================
    // TRIGGER
    // ============================================================

    public class ConversationTriggerDTO
    {
        public List<string> Keywords { get; set; } = new();
        public int StartStepId { get; set; }
    }

    // ============================================================
    // VALIDATION
    // ============================================================

    public class ValidationConfigDTO
    {
        public bool Required { get; set; }
        public int? MinLength { get; set; }
        public int? MaxLength { get; set; }
        public string? Regex { get; set; }
        public string ErrorMessage { get; set; } = "Invalid input.";
    }

    // ============================================================
    // API CONFIG
    // ============================================================

    public class ApiConfigDTO
    {
        public string? Method { get; set; } = "GET";
        public string? Url { get; set; }
        public Dictionary<string, string>? Headers { get; set; }
        public string? BodyTemplate { get; set; }
    }

    // ============================================================
    // RESPONSE
    // ============================================================

    public class ConversationResponseDTO
    {
        public string Text { get; set; } = string.Empty;
        public List<ConversationButtonDTO>? Buttons { get; set; }
    }

    public class ConversationButtonDTO
    {
        public string Id { get; set; } = string.Empty;
        public string Title { get; set; } = string.Empty;
    }

    // ============================================================
    // CONDITIONAL
    // ============================================================

    public class ConditionDTO
    {
        public string? ContextKey { get; set; }
        public string? Operator { get; set; }         // e.g., "IN", "==", "!="
        public List<string>? Value { get; set; }      // Changed from string? to List<string> to support arrays
        public bool Default { get; set; } = false;    // Optional default fallback
        public int NextStepId { get; set; }
    }


    // ============================================================
    // ENUMS
    // ============================================================

    public enum ConversationReplyType
    {
        Text = 0,
        Interactive = 1
    }

    public enum MessageHubPlatformType
    {
        PostMan = 0,
        WhatsApp = 1,
        Teams = 2,
        Telegram = 3,
        Slack = 4,
        SMS = 5
    }

    public enum OtpPlatform
    {
        SMS,
        EMAIL,
        WHATSAPP,
        TEAMS,
        TELEGRAM,
        SLACK
    }
    public class FlowDefinition
    {
        public List<FlowStep> Steps { get; set; } = new();
    }
    public class FlowStep
    {
        public string StepId { get; set; }
        public string StepType { get; set; }
        public string NextStepId { get; set; }
        public string CapabilityCode { get; set; }
        public string MessageTemplateKey { get; set; }
    }
}