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

namespace PKHeX.Core;

/// <summary>
/// Processes input of strings into a list of valid Filters and Instructions.
/// </summary>
public sealed class StringInstructionSet
{
    public readonly IReadOnlyList<StringInstruction> Filters;
    public readonly IReadOnlyList<StringInstruction> Instructions;

    private const string SetSeparator = ";";

    public StringInstructionSet(IReadOnlyList<StringInstruction> filters, IReadOnlyList<StringInstruction> instructions)
    {
        Filters = filters;
        Instructions = instructions;
    }

    public StringInstructionSet(ICollection<string> set)
    {
        Filters = StringInstruction.GetFilters(set).ToList();
        Instructions = StringInstruction.GetInstructions(set).ToList();
    }

    public static IEnumerable<StringInstructionSet> GetBatchSets(IList<string> lines)
    {
        int start = 0;
        while (start < lines.Count)
        {
            var list = lines.Skip(start).TakeWhile(_ => !lines[start++].StartsWith(SetSeparator, StringComparison.Ordinal)).ToList();
            yield return new StringInstructionSet(list);
        }
    }
}