using Microsoft.EntityFrameworkCore;
using MiGu.Server.Persistence;

namespace MiGu.Server.Wms;

public sealed class WmsReferenceValidator
{
    private readonly MiGuDbContext _db;

    public WmsReferenceValidator(MiGuDbContext db)
    {
        _db = db;
    }

    public async Task EnsureWarehouseAsync(Guid id)
    {
        if (!await _db.Warehouses.AnyAsync(x => x.Id == id))
            throw new InvalidOperationException("仓库不存在");
    }

    public async Task EnsureAreaAsync(Guid id)
    {
        if (!await _db.WarehouseAreas.AnyAsync(x => x.Id == id))
            throw new InvalidOperationException("库区不存在");
    }

    public async Task EnsureStorageAsync(Guid id)
    {
        if (!await _db.Storages.AnyAsync(x => x.Id == id))
            throw new InvalidOperationException("库位不存在");
    }

    public async Task EnsureContainerAsync(Guid id)
    {
        if (!await _db.Containers.AnyAsync(x => x.Id == id))
            throw new InvalidOperationException("容器不存在");
    }

    public async Task EnsureMaterialAsync(Guid id)
    {
        if (!await _db.Materials.AnyAsync(x => x.Id == id))
            throw new InvalidOperationException("物料不存在");
    }

    public async Task EnsureMaterialTypeCodeAsync(string typeCode)
    {
        if (!await _db.MaterialTypes.AnyAsync(x => x.Code == typeCode))
            throw new InvalidOperationException("物料类型不存在");
    }

    public async Task<(string Code, string Name)> ResolveLocationSnapshotAsync(string locationType, string locationId)
    {
        if (!ContainerLocationTypes.IsDefined(locationType))
            throw new InvalidOperationException("位置类型无效");
        if (string.IsNullOrWhiteSpace(locationId))
            throw new InvalidOperationException("位置 ID 不能为空");

        if (ContainerLocationTypes.EqualsString(ContainerLocationTypes.Storage, locationType))
        {
            if (!Guid.TryParse(locationId, out var id)) throw new InvalidOperationException("库位 ID 格式无效");
            var s = await _db.Storages.FirstOrDefaultAsync(x => x.Id == id);
            if (s == null) throw new InvalidOperationException("库位不存在");
            return (s.Code, s.Name);
        }

        // 车辆来自现有调度/投影系统，首期不建库内外键，保留原始 ID 并作为快照展示。
        return (locationId, locationId);
    }
}