using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Http;

namespace rgbc_sds.services.Models
{
    /// <summary>
    /// View model for import file upload
    /// </summary>
    public class ImportUploadViewModel
    {
        /// <summary>
        /// Excel file to upload
        /// </summary>
        [Required(ErrorMessage = "Please select a file to upload")]
        public IFormFile? File { get; set; }

        /// <summary>
        /// Import strategy to use
        /// </summary>
        [Required(ErrorMessage = "Please select an import strategy")]
        public string ImportMode { get; set; } = "UpdateExisting";

        /// <summary>
        /// Additional notes about the import
        /// </summary>
        [StringLength(500, ErrorMessage = "Notes cannot exceed 500 characters")]
        public string? Notes { get; set; }

        /// <summary>
        /// Available import modes
        /// </summary>
        public List<ImportModeOption> AvailableImportModes { get; set; } = new()
        {
            new ImportModeOption { Value = "UpdateExisting", DisplayName = "Update Existing Shipments Only", Description = "Update existing shipments if Indent Number matches, skip if not found" },
            new ImportModeOption { Value = "AddNewOnly", DisplayName = "Add New Shipments Only", Description = "Only create new shipments, skip existing ones" }
        };
    }

    /// <summary>
    /// Import mode option for dropdown
    /// </summary>
    public class ImportModeOption
    {
        public string Value { get; set; } = string.Empty;
        public string DisplayName { get; set; } = string.Empty;
        public string Description { get; set; } = string.Empty;
    }

    /// <summary>
    /// View model for import session summary
    /// </summary>
    public class ImportSessionViewModel
    {
        public Guid Id { get; set; }
        public string FileName { get; set; } = string.Empty;
        public string Status { get; set; } = string.Empty;
        public int TotalRows { get; set; }
        public int ValidRows { get; set; }
        public int ErrorRows { get; set; }
        public decimal SuccessRate { get; set; }
        public string CreatedBy { get; set; } = string.Empty;
        public DateTime CreatedAt { get; set; }
        public DateTime? CompletedAt { get; set; }
        public int? ProcessingTime { get; set; }
        public string ImportMode { get; set; } = string.Empty;
        public string? Notes { get; set; }
        public bool IsActive { get; set; }
        public bool IsCompleted { get; set; }
        public bool CanExecute { get; set; }
        public bool CanCancel { get; set; }
        public bool HasErrors => ErrorRows > 0;
    }

    /// <summary>
    /// View model for staging data preview
    /// </summary>
    public class StagingPreviewViewModel
    {
        public Guid SessionId { get; set; }
        public string FileName { get; set; } = string.Empty;
        public int TotalRecords { get; set; }
        public int ValidRecords { get; set; }
        public int ErrorRecords { get; set; }
        public List<StagingRecordViewModel> Records { get; set; } = new List<StagingRecordViewModel>();
        public int CurrentPage { get; set; }
        public int PageSize { get; set; }
        public int TotalPages { get; set; }
        public bool HasErrors { get; set; }
        public bool CanExecute { get; set; }
    }

    /// <summary>
    /// View model for individual staging record
    /// </summary>
    public class StagingRecordViewModel
    {
        public long Id { get; set; }
        public int RowNumber { get; set; }
        public string Status { get; set; } = string.Empty;
        public string SupplierName { get; set; } = string.Empty;
        public string IndentNumber { get; set; } = string.Empty;
        public string? ShipshapeNumber { get; set; }
        public string? MotherVessel { get; set; }
        public string? ETA { get; set; }
        public string? BillOfEntryNumber { get; set; }
        public string? ContainerNumber { get; set; }
        public string? OffloadingPort { get; set; }
        public string? ContainerReceived { get; set; }
        public string? NoOfFlatcases { get; set; }
        public string? Voyage { get; set; }
        public string? MBLNumber { get; set; }
        public string? RedirectToSACD { get; set; }
        public bool IsUpdate { get; set; }
        public string? ErrorMessage { get; set; }
        public bool HasErrors => !string.IsNullOrEmpty(ErrorMessage);
        public string StatusClass => Status switch
        {
            "Pending" => "table-warning",
            "Validated" => "table-success",
            "Imported" => "table-info",
            "Error" => "table-danger",
            _ => "table-secondary"
        };
    }

    /// <summary>
    /// View model for import execution
    /// </summary>
    public class ImportExecutionViewModel
    {
        public Guid SessionId { get; set; }
        public string FileName { get; set; } = string.Empty;
        public int TotalRecords { get; set; }
        public int ValidRecords { get; set; }
        public string ImportMode { get; set; } = string.Empty;
        public bool IsExecuting { get; set; }
        public ImportProgressViewModel? Progress { get; set; }
        public ImportResultViewModel? Result { get; set; }
    }

    /// <summary>
    /// View model for import progress
    /// </summary>
    public class ImportProgressViewModel
    {
        public int CurrentRecord { get; set; }
        public int TotalRecords { get; set; }
        public string CurrentOperation { get; set; } = string.Empty;
        public decimal PercentageComplete { get; set; }
        public string ProgressBarClass => PercentageComplete switch
        {
            >= 100 => "bg-success",
            >= 75 => "bg-info",
            >= 50 => "bg-warning",
            >= 25 => "bg-primary",
            _ => "bg-secondary"
        };
    }

    /// <summary>
    /// View model for import result
    /// </summary>
    public class ImportResultViewModel
    {
        public bool IsSuccess { get; set; }
        public string Message { get; set; } = string.Empty;
        public int RecordsProcessed { get; set; }
        public int RecordsSkipped { get; set; }
        public int RecordsFailed { get; set; }
        public List<string> Errors { get; set; } = new List<string>();
        public TimeSpan ProcessingTime { get; set; }
        public string ResultClass => IsSuccess ? "alert-success" : "alert-danger";
        public string ResultIcon => IsSuccess ? "✓" : "✗";
    }

    /// <summary>
    /// View model for import history
    /// </summary>
    public class ImportHistoryViewModel
    {
        public List<ImportSessionViewModel> RecentSessions { get; set; } = new List<ImportSessionViewModel>();
        public int TotalSessions { get; set; }
        public int SuccessfulSessions { get; set; }
        public int FailedSessions { get; set; }
        public decimal OverallSuccessRate { get; set; }
        public bool HasSessions => RecentSessions.Count > 0;
    }

    /// <summary>
    /// View model for import error details
    /// </summary>
    public class ImportErrorViewModel
    {
        public long Id { get; set; }
        public string ErrorType { get; set; } = string.Empty;
        public string ErrorMessage { get; set; } = string.Empty;
        public string? ErrorDetails { get; set; }
        public int? RowNumber { get; set; }
        public string? FieldName { get; set; }
        public string Severity { get; set; } = string.Empty;
        public DateTime CreatedAt { get; set; }
        public string SeverityClass => Severity switch
        {
            "Critical" => "text-danger fw-bold",
            "Error" => "text-danger",
            "Warning" => "text-warning",
            "Info" => "text-info",
            _ => "text-secondary"
        };
        public string SeverityIcon => Severity switch
        {
            "Critical" => "🚨",
            "Error" => "❌",
            "Warning" => "⚠️",
            "Info" => "ℹ️",
            _ => "•"
        };
    }
}