package sys

import (
	"SciencesServer/app/api/admin/model"
	model2 "SciencesServer/app/common/model"
	"SciencesServer/app/session"
	"errors"
	"time"
)

type About struct {
	*session.Admin
}

type AboutHandle func(session *session.Admin) *About

type (
	// AboutInfo 关于信息
	AboutInfo struct {
		ID        string       `json:"id"`
		ParentID  string       `json:"parent_id"`
		Title     string       `json:"title"`
		Area      string       `json:"area"`
		UpdatedAt time.Time    `json:"updated_at"`
		Children  []*AboutInfo `json:"children"`
	}
	// AboutDetailInfo 详细信息
	AboutDetailInfo struct {
		ID       string `json:"id"`
		TenantID string `json:"tenant_id"`
		ParentID string `json:"parent_id"`
		*model2.SysAbout
	}
	// AboutParams 关于参数信息
	AboutParams struct {
		ID, TenantID, ParentID uint64
		Title, Content         string
		Sort                   int
	}
)

func (c *About) tree(src []*model.SysAboutInfo, parentID uint64) []*AboutInfo {
	out := make([]*AboutInfo, 0)

	for _, v := range src {
		if v.ParentID == parentID {
			out = append(out, &AboutInfo{
				ID:        v.GetEncodeID(),
				ParentID:  (&model2.Model{ID: v.ParentID}).GetEncodeID(),
				Title:     v.Title,
				Area:      v.FormatBasic(),
				UpdatedAt: v.UpdatedAt,
				Children:  c.tree(src, v.ID),
			})
		}
	}
	return out
}

// Instance 首页信息
func (c *About) Instance(tenantID uint64) ([]*AboutInfo, error) {
	mSysAbout := model.NewSysAbout()

	where := make([]*model2.ModelWhere, 0)

	if c.TenantID > 0 {
		where = append(where, model2.NewWhere("a.tenant_id", c.TenantID))
	}

	if tenantID > 0 {
		where = append(where, model2.NewWhere("a.tenant_id", tenantID))
	}
	out, err := mSysAbout.About(where...)

	if err != nil {
		return nil, err
	}
	return c.tree(out, 0), nil
}

func (c *About) Detail(id uint64) (*AboutDetailInfo, error) {
	mSysAbout := model.NewSysAbout()
	mSysAbout.ID = id

	isExist, err := model2.First(mSysAbout.SysAbout)

	if err != nil {
		return nil, err
	} else if !isExist {
		return nil, errors.New("操作错误，关于信息不存在或已被删除")
	}
	return &AboutDetailInfo{
		ID:       mSysAbout.GetEncodeID(),
		TenantID: mSysAbout.GetEncodeTenantID(),
		ParentID: (&model2.Model{ID: mSysAbout.ParentID}).GetEncodeID(),
		SysAbout: mSysAbout.SysAbout,
	}, nil
}

func (c *About) Form(params *AboutParams) error {
	mSysAbout := model.NewSysAbout()

	if params.ID > 0 {
		mSysAbout.ID = params.ID

		isExist, err := model2.FirstField(mSysAbout.SysAbout, []string{"id", "tenant_id", "created_at"})

		if err != nil {
			return err
		} else if !isExist {
			return errors.New("操作错误，关于信息不存在或已被删除")
		}
		if c.TenantID > 0 && c.TenantID != mSysAbout.TenantID {
			return errors.New("操作错误，无权限操作")
		}
	}
	mSysAbout.Title = params.Title
	mSysAbout.ParentID = params.ParentID
	mSysAbout.Content = params.Content
	mSysAbout.Sort = params.Sort

	if mSysAbout.ID > 0 {
		if c.TenantID <= 0 {
			mSysAbout.TenantID = params.TenantID
		}
		return model2.Updates(mSysAbout.SysAbout, mSysAbout.SysAbout)
	}
	mSysAbout.TenantID = params.TenantID

	if c.TenantID > 0 {
		mSysAbout.TenantID = c.TenantID
	}
	return model2.Create(mSysAbout.SysAbout)
}

func (c *About) Delete(id uint64) error {
	mSysAbout := model.NewSysAbout()
	mSysAbout.ID = id

	isExist, err := model2.FirstField(mSysAbout.SysAbout, []string{"id", "tenant_id"})

	if err != nil {
		return err
	} else if !isExist {
		return errors.New("操作错误，关于信息不存在或已被删除")
	}
	if c.TenantID > 0 && mSysAbout.TenantID != c.TenantID {
		return errors.New("操作错误，无权限操作")
	}
	return model2.Delete(mSysAbout.SysAbout)
}

func NewAbout() AboutHandle {
	return func(session *session.Admin) *About {
		return &About{session}
	}
}