using Luban.Job.Cfg.Defs;
using Luban.Job.Common.Defs;
using Scriban;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Luban.Job.Cfg.Generate
{
    abstract class GoCodeRenderBase
    {
        public string RenderAny(object o)
        {
            switch (o)
            {
                case DefConst c: return Render(c);
                case DefEnum e: return Render(e);
                case DefBean b: return Render(b);
                case DefTable r: return Render(r);
                default: throw new Exception($"unknown render type:{o}");
            }
        }

        [ThreadStatic]
        private static Template t_constRender;

        private string Render(DefConst c)
        {
            string package = "cfg";

            var template = t_constRender ??= Template.Parse(@"

package {{package}}

const (
    {{~for item in x.items ~}}
    {{x.go_full_name}}_{{item.name}} = {{go_const_value item.ctype item.value}}
    {{~end~}}
)
");
            var result = template.RenderCode(c, new Dictionary<string, object>() { ["package"] = package });

            return result;
        }

        [ThreadStatic]
        private static Template t_enumRender;

        private string Render(DefEnum e)
        {
            string package = "cfg";

            var template = t_enumRender ??= Template.Parse(@"

package {{package}}

const (
    {{~for item in x.items ~}}
    {{x.go_full_name}}_{{item.name}} = {{item.value}}
    {{~end~}}
)

");
            var result = template.RenderCode(e, new Dictionary<string, object>() { ["package"] = package });

            return result;
        }


        protected abstract string Render(DefBean b);

        protected abstract string Render(DefTable p);

        public abstract string RenderService(string name, string module, List<DefTable> tables);
    }
}