package model

import (
	"context"
	"errors"
	"model-gateway/common/util"
	"model-gateway/consts/public"
	"model-gateway/dao"
	"model-gateway/model/dto"
	"model-gateway/model/entity"
	"model-gateway/service/gateway"

	"gitea.com/red-future/common/beans"
	"gitea.com/red-future/common/db/gfdb"
	"gitea.com/red-future/common/utils"
	"github.com/gogf/gf/v2/database/gdb"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/util/gconv"
)

var Model = &modelService{}

type modelService struct{}

// Create 创建模型
func (s *modelService) Create(ctx context.Context, req *dto.CreateModelReq) (*dto.CreateModelRes, error) {
	// 1）如果设为会话模型，先把该用户旧会话模型取消
	if !g.IsEmpty(req.IsChatModel) && *req.IsChatModel == 1 {
		if err := s.clearUserChatModel(ctx); err != nil {
			return nil, err
		}
	}
	// 2）判断是否超管，决定 isOwner
	req.IsOwner = gconv.PtrInt(1)
	if isAdmin, _ := gateway.IsSuperAdmin(ctx); isAdmin {
		req.IsOwner = gconv.PtrInt(0)
	}

	// 3）入库
	id, err := dao.Model.Insert(ctx, util.ConvertTo[entity.AsynchModel](req))
	if err != nil {
		return nil, err
	}
	return &dto.CreateModelRes{ID: id}, nil
}

// Update 更新模型配置
func (s *modelService) Update(ctx context.Context, req *dto.UpdateModelReq) error {
	// 1）会话模型唯一性校验
	if req.IsChatModel != nil && *req.IsChatModel == 1 {
		if err := s.checkChatModelUnique(ctx); err != nil {
			return err
		}
	}
	// 2）超管创建/普通用户更新
	req.IsOwner = gconv.PtrInt(1)
	if isAdmin, _ := gateway.IsSuperAdmin(ctx); isAdmin {
		req.IsOwner = gconv.PtrInt(0)
		_, err := dao.Model.Update(ctx, util.ConvertTo[entity.AsynchModel](req))
		return err
	}
	// 3）跨租户判断：超管的模型不允许直接修改，走插入新记录
	model, err := dao.Model.GetByAcrossTenant(ctx, &entity.AsynchModel{
		SQLBaseDO: beans.SQLBaseDO{Id: req.ID},
	})
	if err != nil {
		return err
	}
	if model.TenantId == 1 {
		_, err = dao.Model.Insert(ctx, util.ConvertTo[entity.AsynchModel](req))
		return err
	}
	_, err = dao.Model.Update(ctx, util.ConvertTo[entity.AsynchModel](req))
	return err
}

// Delete 删除模型
func (s *modelService) Delete(ctx context.Context, req *dto.DeleteModelReq) error {
	_, err := dao.Model.Delete(ctx, &entity.AsynchModel{
		SQLBaseDO: beans.SQLBaseDO{Id: req.ID},
	})
	return err
}

// Get 获取模型详情
func (s *modelService) Get(ctx context.Context, req *dto.GetModelReq) (*dto.GetModelRes, error) {
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return nil, err
	}
	if g.IsEmpty(req.ID) {
		req.Creator = user.UserName
	}
	modelReq := new(entity.AsynchModel)
	err = gconv.Struct(req, modelReq)
	if err != nil {
		return nil, err
	}
	model, err := dao.Model.Get(ctx, modelReq)
	if err != nil {
		return nil, err
	}
	return &dto.GetModelRes{
		Model: model,
	}, nil
}

// List 获取模型列表
func (s *modelService) List(ctx context.Context, req *dto.ListModelReq) (*dto.ListModelRes, error) {
	// 1）判断超管
	req.IsOwner = gconv.PtrInt(1)
	if isAdmin, _ := gateway.IsSuperAdmin(ctx); isAdmin {
		req.IsOwner = gconv.PtrInt(0)
	}

	// 2）获取当前用户
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return nil, err
	}
	req.Creator = user.UserName

	// 3）查询
	models, total, err := dao.Model.GetByCreatorAndPlatform(ctx, req)
	if err != nil {
		return nil, err
	}

	return &dto.ListModelRes{List: models, Total: total}, nil
}

// UpdateChatModel 设置会话模型
func (s *modelService) UpdateChatModel(ctx context.Context, req *dto.UpdateChatModelReq) error {
	// 1）校验新模型存在
	newModel, err := dao.Model.GetByAcrossTenant(ctx, &entity.AsynchModel{
		SQLBaseDO: beans.SQLBaseDO{Id: req.Id},
	})
	if err != nil || newModel == nil {
		return errors.New("新会话模型不存在")
	}

	// 2）获取当前用户的会话模型
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return err
	}
	currentModel, err := dao.Model.Get(ctx, &entity.AsynchModel{
		SQLBaseDO:   beans.SQLBaseDO{Creator: user.UserName},
		IsChatModel: new(1),
	})
	if err != nil {
		return err
	}

	// 3）事务：取消旧的 + 设置新的
	return gfdb.DB(ctx).Transaction(ctx, func(ctx context.Context, tx gdb.TX) error {
		if !g.IsEmpty(currentModel) {
			if currentModel.ModelType != public.ModelTypeInference {
				return errors.New("当前模型为非推理模型，不能设置为会话模型")
			}
			if currentModel.Id != req.Id {
				_, err = dao.Model.Update(ctx, &entity.AsynchModel{
					SQLBaseDO:   beans.SQLBaseDO{Id: currentModel.Id},
					IsChatModel: gconv.PtrInt(0),
				})
				if err != nil {
					return err
				}
			}
		}

		_, err = dao.Model.Update(ctx, &entity.AsynchModel{
			SQLBaseDO:   beans.SQLBaseDO{Id: req.Id},
			IsChatModel: gconv.PtrInt(1),
		})
		return err
	})
}

// GetIsChatModel 获取当前用户会话模型
func (s *modelService) GetIsChatModel(ctx context.Context) (*dto.GetIsChatModelRes, error) {
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return nil, err
	}
	model, err := dao.Model.Get(ctx, &entity.AsynchModel{
		SQLBaseDO:   beans.SQLBaseDO{Creator: user.UserName},
		IsChatModel: new(1),
	})
	if err != nil || model == nil {
		return nil, err
	}
	return &dto.GetIsChatModelRes{Model: model}, nil
}

// ==================== 辅助方法 ====================

// clearUserChatModel 清除当前用户旧会话模型
func (s *modelService) clearUserChatModel(ctx context.Context) error {
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return err
	}
	model, err := dao.Model.Get(ctx, &entity.AsynchModel{
		SQLBaseDO:   beans.SQLBaseDO{Creator: user.UserName},
		IsChatModel: new(1),
	})
	if err != nil || model == nil {
		return nil
	}
	_, err = dao.Model.Update(ctx, &entity.AsynchModel{
		SQLBaseDO:   beans.SQLBaseDO{Id: model.Id},
		IsChatModel: gconv.PtrInt(0),
	})
	return err
}

// checkChatModelUnique 校验用户是否已有会话模型
func (s *modelService) checkChatModelUnique(ctx context.Context) error {
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return err
	}
	model, err := dao.Model.Get(ctx, &entity.AsynchModel{
		SQLBaseDO:   beans.SQLBaseDO{Creator: user.UserName},
		IsChatModel: new(1),
	})
	if err != nil {
		return err
	}
	if model != nil {
		return errors.New("用户已存在会话模型")
	}
	return nil
}

// GetModelTypesFromConfig 从配置文件读取模型类型
func GetModelTypesFromConfig() (res *dto.TypeItem, err error) {
	// 返回副本，避免外部修改
	types := make(map[int]string, len(public.ModelTypeName))
	for k, v := range public.ModelTypeName {
		types[k] = v
	}
	return &dto.TypeItem{
		Type: types,
	}, nil
}

// GetOperatorList 获取运营商列表
func GetOperatorList() (res *dto.ListOperatorRes, err error) {
	return &dto.ListOperatorRes{
		List: public.OperatorList,
	}, nil
}