using System.ComponentModel.Design;

namespace ConsoleApp2;


public class DataRecord
{
    public static bool TryGetField(DataRecord record, string columnName, out string value)
    {
        value = string.Empty;
        if (record.Headers is null)
            throw new InvalidOperationException("Cannot get field when headers of a record have not been set.");
        var idx = Array.IndexOf(record.Headers, columnName); //可能可以优化
        if (idx == -1)
            return false;
        value = record.Fields[idx];
        return true;
    }

    public static string GetField(DataRecord record, string columnName)
    {
        if (record.Headers is null)
            throw new InvalidOperationException("Headers have not been set.");
        var idx = Array.IndexOf(record.Headers, columnName);
        if (idx is -1)
            throw new IndexOutOfRangeException("Column name not found in this record.");
        return record.Fields[idx];
    }


    public string[] Fields { get; }

    public string[] Headers { get; }

    public string TableName { get; }

    public string? Database { get; set; }
    public int CompanyID { get; set; }


    public DataRecord(string[] fields, string tableName, string[] headers, int companyID=0)
    {
        if (fields.Length != headers.Length)
            throw new ArgumentException(
                $"The number of fields does not match the number of headers. Expected: {headers.Length} Got: {fields.Length} Fields: {string.Join(',', fields)}",
                nameof(fields));

        Fields = fields;
        TableName = tableName;
        Headers = headers;
        CompanyID = companyID;
    }

    public string this[int index]
    {
        get => Fields[index];
        set => Fields[index] = value;
    }

    public string this[string columnName] => GetField(this, columnName);

    public int Count => Fields.Length;

    public bool TryGetField(string columnName, out string value) => TryGetField(this, columnName, out value);

    public bool SetField(string columnName,  string value) => SetField(this, columnName,value);

    public string GetCacheKey(string columnName) => GetCacheKey(this, columnName);

    public  bool SetField( DataRecord record,string columnName,string value)
    {
        if (record.Headers is null)
            throw new InvalidOperationException("Headers have not been set.");
        var idx = Array.IndexOf(record.Headers, columnName);
        if (idx is -1)
            throw new IndexOutOfRangeException("Column name not found in this record.");
        record.Fields[idx] = value;
        return true;
    }
    public string GetCacheKey(DataRecord record, string columnName)
    {
        if (TryGetField(record, columnName, out var  value))
        {
            return $"{TableName}_{value}";
        }else
            throw new IndexOutOfRangeException($"Column name:{columnName} not found in this record.");


    }
}