using System.Globalization;
using System.Text.Json;

namespace XFEEDToolBox.Core.Galaxy;

public sealed record GalaxyMissionItem(ulong MissionId,IReadOnlyList<long> SystemAddresses,long? SelectedSystemAddress)
{
    public int MarkerType {get;init;}
}
public sealed record GalaxyMissionsSnapshot(bool Available,IReadOnlyList<GalaxyMissionItem> Missions)
{
    public bool Complete=>false;
}
public sealed record GalaxyMissionMapTarget(ulong MissionId,long? SystemAddress,int MarkerType,string Label);

public sealed partial class NativeGalaxyAccountCatalog
{
    public async Task<GalaxyMissionsSnapshot> ReadMissionsAsync(CancellationToken token=default)
    {
        var page=await pipe.CallAsync(new{op="galaxy.missions",limit=16},token);
        if(!page.GetProperty("available").GetBoolean())return new(false,[]);
        var generation=page.GetProperty("generation").GetUInt64();var total=page.GetProperty("total").GetInt32();var entity=page.GetProperty("entityId").GetString();
        if(generation==0||total is <0 or >4096||string.IsNullOrEmpty(entity))throw new InvalidDataException("原游戏任务快照标识无效。");
        static long Address(JsonElement value)
        {
            if(!long.TryParse(value.GetString(),NumberStyles.None,CultureInfo.InvariantCulture,out var address)||address<=0||address>=1L<<55)
                throw new InvalidDataException("原游戏任务星系地址无效。");return address;
        }
        var missions=new List<GalaxyMissionItem>();var offset=0;
        while(true)
        {
            token.ThrowIfCancellationRequested();
            if(!page.GetProperty("available").GetBoolean()||page.GetProperty("generation").GetUInt64()!=generation||page.GetProperty("entityId").GetString()!=entity||page.GetProperty("total").GetInt32()!=total)
                throw new InvalidDataException("原游戏任务快照已变化，请重试。");
            var rows=page.GetProperty("items");if(rows.ValueKind!=JsonValueKind.Array||rows.GetArrayLength()>16||offset+rows.GetArrayLength()>total)throw new InvalidDataException("原游戏任务分页无效。");
            foreach(var row in rows.EnumerateArray())
            {
                // Mission IDs have their own full u64 namespace. The original
                // callback compares all bits; no address/sentinel rule applies.
                if(!ulong.TryParse(row.GetProperty("missionId").GetString(),NumberStyles.None,CultureInfo.InvariantCulture,out var id))throw new InvalidDataException("原游戏任务 ID 无效。");
                var type=row.GetProperty("markerType").GetInt32();var addresses=row.GetProperty("systemAddresses");
                if(type is not(4 or 45)||addresses.ValueKind!=JsonValueKind.Array||addresses.GetArrayLength()>4096)throw new InvalidDataException("原游戏任务目标集合无效。");
                var systems=addresses.EnumerateArray().Select(Address).ToArray();
                var selectedValue=row.GetProperty("selectedSystemAddress");long? selected=selectedValue.ValueKind==JsonValueKind.Null?null:Address(selectedValue);
                if(selected!=(systems.Length==0?(long?)null:systems[^1]))throw new InvalidDataException("原游戏任务所选地址不是完整原目标集合的最后项。");
                missions.Add(new(id,systems,selected){MarkerType=type});
            }
            offset+=rows.GetArrayLength();if(offset==total)break;if(rows.GetArrayLength()==0)throw new InvalidDataException("原游戏任务分页未继续。");
            page=await pipe.CallAsync(new{op="galaxy.missions",generation,offset,limit=16},token);
        }
        return new(true,missions);
    }
}