package webutility

import "gopkg.in/rana/ora.v3"

type ListOptions struct {
	GlobalFilter  bool   `json:"globalFilter"`
	LocalFilters  bool   `json:"localFilters"`
	RemoteFilters bool   `json:"remoteFilters"`
	Pagination    bool   `json:"pagination"`
	PageSize      uint64 `json:"pageSize"`
	Pivot         bool   `json:"pivot"`
	Detail        bool   `json:"detail"`
	Total         bool   `json:"total"`
}

type ListFilter struct {
	Position       uint32   `json:"-"`
	ObjectType     string   `json:"-"`
	FiltersField   string   `json:"filtersField"`
	DefaultValues  string   `json:"defaultValues"`
	FiltersType    string   `json:"filtersType"`
	FiltersLabel   string   `json:"filtersLabel"`
	DropdownConfig Dropdown `json:"dropdownConfig"`
}

type Dropdown struct {
	ObjectType   string `json:"objectType"`
	FiltersField string `json:"filtersField"`
	IDField      string `json:"idField"`
	LabelField   string `json:"labelField"`

}

type ListGraph struct {
	ObjectType string `json:"objectType"`
	X string          `json:"xField"`
	Y string          `json:"yField"`
	GroupField string `json:"groupField"`
	Label string      `json:"label"`
}

type ListActions struct {
	Create bool `json:"create"`
	Update bool `json:"update"`
	Delete bool `json:"delete"`
	Export bool `json:"export"`
	Print  bool `json:"print"`
	Graph  bool `json:"graph"`
}

type ListNavNode struct {
	ObjectType        string `json:"objectType"`
	LabelField        string `json:"label"`
	Icon              string `json:"icon"`
	ParentObjectType  string `json:"parentObjectType"`
	ParentIDField     string `json:"parentIdField"`
	ParentFilterField string `json:"parentFilterField"`
}

type ListParentNode struct {
	ObjectType  string `json:"objectType"`
	LabelField  string `json:"labelField"`
	FilterField string `json:"filterField"`
}

type ListPivot struct {
	ObjectType    string `json:"objectType"`
	GroupField    string `json:"groupField"`
	DistinctField string `json:"distinctField"`
	Value         string `json:"valueField"`
}

type ListDetails struct {
	ObjectType        string `json:"objectType"`
	ParentObjectType  string `json:"parentObjectType"`
	ParentFilterField string `json:"parentFilterField"`
	SingleDetail      bool   `json:"singleDetail"`
}

type ListConfig struct {
	ObjectType string           `json:"objectType"`
	Title      string           `json:"title"`
	LazyLoad   bool             `json:"lazyLoad"`
	InlineEdit bool             `json:"inlineEdit"`
	Options    ListOptions      `json:"options"`
	Filters    []ListFilter     `json:"defaultFilters"`
	Graphs     []ListGraph      `json:"graphs"`
	Actions    ListActions      `json:"actions"`
	Parent     []ListParentNode `json:"parent"`
	Navigation []ListNavNode    `json:"navigation"`
	Pivots     []ListPivot      `json:"pivots"`
	Details    ListDetails      `json:"details"`
}

// GetListConfig returns list configuration for the provided object type for the front-end application
// or an error if it fails.
func GetListConfig(db *ora.Ses, objType string) (ListConfig, error) {
	resp := newDefaultList(objType)
	var err error

	err = setListParams(db, &resp, objType)
	resp.Navigation, err = getListNavigation(db, objType)
	resp.Actions, err = getListActions(db, objType)
	resp.Filters, err = getListFilters(db, objType)
	resp.Options, err = getListOptions(db, objType)
	resp.Parent, err = getListParent(db, objType)
	resp.Graphs, err = getListGraph(db, objType)
	resp.Pivots, err = getListPivot(db, objType)
	resp.Details, err = getListDetails(db, objType)

	if err != nil {
		return ListConfig{}, err
	}

	return resp, nil
}

// GetListConfigObjectIDField takes in database connection and an object type and it returns the
// ID field name for the provided object type.
func GetListConfigObjectIDField(db *ora.Ses, otype string) string {
	var resp string
	var err error
	var stmt *ora.Stmt

	stmt, err = db.Prep(`SELECT
		ID_FIELD
		FROM LIST_CONFIG_ID_FIELD
		WHERE OBJECT_TYPE = '` + otype + `'`,
		ora.S)

	defer stmt.Close()

	if err != nil {
		return ""
	}

	rset, err := stmt.Qry()
	if rset.Next() {
		resp = rset.Row[0].(string)
	}

	if rset.Err != nil {
		return ""
	}

	return resp
}

// newDefaultList returns default configuration for the provided object type.
func newDefaultList(objType string) ListConfig {
	list := ListConfig{
		ObjectType: objType,
		Title: objType,
		LazyLoad: false,
		Options: ListOptions{
			GlobalFilter: true,
			LocalFilters: true,
			RemoteFilters: false,
			Pagination: true,
			PageSize: 20,
		},
		Filters: nil,
		Actions: ListActions{
			Create: false,
			Update: false,
			Delete: false,
			Export: false,
			Print: false,
			Graph: false,
		},
		Parent: nil,
		Navigation: nil,
	}

	return list
}

// setListParams sets the default parameters of the provided configuration list for the provided object type.
func setListParams(db *ora.Ses, list *ListConfig, objType string) error {
	var err error
	var stmt *ora.Stmt
	query := `SELECT
		OBJECT_TYPE, TITLE, LAZY_LOAD, INLINE_EDIT
		FROM LIST_CONFIG
		WHERE OBJECT_TYPE = '` + objType + `'`

	stmt, err = db.Prep(query, ora.S, ora.S, ora.U32, ora.U32)
	if err != nil {
		return err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return err
	}
	if rset.Next() {
		otype := rset.Row[0].(string)
		if otype != "" {
			list.ObjectType = otype
		}

		title := rset.Row[1].(string)
		if title != "" {
			list.Title = title
		}
		list.LazyLoad = rset.Row[2].(uint32) != 0
		list.InlineEdit = rset.Row[3].(uint32) != 0
	}
	if rset.Err != nil {
		return rset.Err
	}
	return nil
}

// getListNavigation returns list navigation node slice for the provided objectType.
func getListNavigation(db *ora.Ses, listObjType string) ([]ListNavNode, error) {
	resp := make([]ListNavNode, 0)
	var err error
	var stmt *ora.Stmt
	query := `SELECT
		a.OBJECT_TYPE, a.PARENT_OBJECT_TYPE, a.LABEL, a.ICON, a.PARENT_FILTER_FIELD, b.PARENT_ID_FIELD, b.RB
		FROM LIST_CONFIG_NAVIGATION b
		JOIN LIST_CONFIG_CHILD a ON b.PARENT_CHILD_ID = a.PARENT_CHILD_ID
		WHERE b.LIST_OBJECT_TYPE = '`+listObjType+`'
		ORDER BY b.RB ASC`

	stmt, err = db.Prep(query, ora.S, ora.S, ora.S, ora.S, ora.S)
	if err != nil {
		return resp, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return resp, err
	}
	for rset.Next() {
		resp = append(resp, ListNavNode{
			ObjectType: rset.Row[0].(string),
			ParentObjectType: rset.Row[1].(string),
			LabelField: rset.Row[2].(string),
			Icon: rset.Row[3].(string),
			ParentFilterField: rset.Row[4].(string),
			ParentIDField: rset.Row[5].(string),
			// RB is ignored
		})
	}
	if rset.Err != nil {
		return nil, rset.Err
	}

	return resp, nil
}

// getListActions returns list actions for the provided object type.
func getListActions(db *ora.Ses, objType string) (ListActions, error) {
	var resp ListActions
	var err error
	var stmt *ora.Stmt
	query := `SELECT
		ACTION_CREATE, ACTION_UPDATE, ACTION_DELETE, ACTION_EXPORT,
		ACTION_PRINT, ACTION_GRAPH
		FROM LIST_CONFIG
		WHERE OBJECT_TYPE = '` + objType + `'`

	stmt, err = db.Prep(query, ora.U32, ora.U32, ora.U32, ora.U32,
		ora.U32, ora.U32)
	if err != nil {
		return ListActions{}, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return ListActions{}, err
	}
	if rset.Next() {
		resp.Create = rset.Row[0].(uint32) != 0
		resp.Update = rset.Row[1].(uint32) != 0
		resp.Delete = rset.Row[2].(uint32) != 0
		resp.Export = rset.Row[3].(uint32) != 0
		resp.Print = rset.Row[4].(uint32) != 0
		resp.Graph = rset.Row[5].(uint32) != 0
	}
	if rset.Err != nil {
		return ListActions{}, rset.Err
	}
	return resp, nil
}

// getListFiters returns list filter slice for the provided object type.
func getListFilters(db *ora.Ses, objType string) ([]ListFilter, error) {
	resp := make([]ListFilter, 0)
	filtersFields, err := getFilterFieldsAndPosition(db, objType)
	if err != nil {
		return nil, err
	}
	for field, pos := range filtersFields {
		filters, _ := getFiltersByFilterField(db, field)
		for _, filter := range filters {
			var f ListFilter
			f.Position = pos
			f.ObjectType = objType
			f.FiltersField = field
			f.DefaultValues = filter.DefaultValues
			f.FiltersLabel = filter.Label
			f.FiltersType = filter.Type
			if filter.Type == "dropdown" {
				f.DropdownConfig, err = getFilterDropdownConfig(db, field)
				if err != nil {
					return nil, err
				}
			}
			resp = append(resp, f)
		}
	}

	sortFilters(resp)

	return resp, nil
}

// getFilterFieldsAndPosition returns a map of filter fields and their respective position in the menu.
func getFilterFieldsAndPosition(db *ora.Ses, objType string) (map[string]uint32, error) {
	filtersField := make(map[string]uint32, 0)
	var err error
	var stmt *ora.Stmt
	query := `SELECT 
		FILTERS_FIELD, RB
		FROM LIST_CONFIG_FILTERS
		WHERE OBJECT_TYPE = '` + objType + `'`

	stmt, err = db.Prep(query, ora.S, ora.U32)
	if err != nil {
		return nil, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return nil, err
	}
	for rset.Next() {
		filtersField[rset.Row[0].(string)] = rset.Row[1].(uint32)
	}
	if rset.Err != nil {
		return nil, rset.Err
	}
	return filtersField, nil
}

type _filter struct {
	DefaultValues string
	Label         string
	Type          string
}

// getFiltersByFilterField returns filter slice for the provided filter field.
func getFiltersByFilterField(db *ora.Ses, filtersField string) ([]_filter, error) {
	resp := make([]_filter, 0)
	var err error
	var stmt *ora.Stmt
	query := `SELECT 
		FILTERS_TYPE, FILTERS_LABEL, DEFAULT_VALUES
		FROM LIST_FILTERS_FIELD
		WHERE FILTERS_FIELD = '` + filtersField + `'`

	stmt, err = db.Prep(query, ora.S, ora.S, ora.S)
	if err != nil {
		return resp, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return resp, err
	}
	for rset.Next() {
		resp = append(resp, _filter{
			Type: rset.Row[0].(string),
			Label: rset.Row[1].(string),
			DefaultValues: rset.Row[2].(string),
		})
	}
	if rset.Err != nil {
		return resp, rset.Err
	}
	return resp, nil
}

// getFilterDropdownConfig returns dropdown menu for the provided filter field.
func getFilterDropdownConfig(db *ora.Ses, filtersField string) (Dropdown, error) {
	var resp Dropdown
	var err error
	var stmt *ora.Stmt
	query := `SELECT 
		FILTERS_FIELD, OBJECT_TYPE, ID_FIELD, LABEL_FIELD
		FROM LIST_DROPDOWN_FILTER
		WHERE FILTERS_FIELD = '` + filtersField + `'`

	stmt, err = db.Prep(query, ora.S, ora.S, ora.S, ora.S)
	if err != nil {
		return resp, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return resp, err
	}
	if rset.Next() {
		resp.FiltersField = rset.Row[0].(string)
		resp.ObjectType = rset.Row[1].(string)
		resp.IDField = rset.Row[2].(string)
		resp.LabelField = rset.Row[3].(string)
	}
	if rset.Err != nil {
		return resp, rset.Err
	}
	return resp, nil
}

// sortFilters bubble sorts provided filters slice by position field.
func sortFilters(filters []ListFilter) {
	done := false
	var temp ListFilter
	for !done {
		done = true
		for i := 0; i < len(filters) - 1; i++ {
			if filters[i].Position > filters[i+1].Position {
				done = false
				temp = filters[i]
				filters[i] = filters[i+1]
				filters[i+1] = temp
			}
		}
	}
}

// getListGraph return list graph slice for the provided object type.
func getListGraph(db *ora.Ses, objType string) ([]ListGraph, error) {
	resp := make([]ListGraph, 0)
	var err error
	var stmt *ora.Stmt
	query := `SELECT 
		OBJECT_TYPE, X_FIELD, Y_FIELD, GROUP_FIELD, LABEL
		FROM LIST_GRAPHS
		WHERE OBJECT_TYPE = '` + objType + `'`

	stmt, err = db.Prep(query, ora.S, ora.S, ora.S, ora.S)
	if err != nil {
		return resp, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return resp, err
	}
	for rset.Next() {
		resp = append(resp, ListGraph{
			ObjectType: rset.Row[0].(string),
			X: rset.Row[1].(string),
			Y: rset.Row[2].(string),
			GroupField: rset.Row[3].(string),
			Label: rset.Row[4].(string),
		})
	}
	if rset.Err != nil {
		return resp, rset.Err
	}
	return resp, nil
}

// getListOptions returns list options for the provided object type.
func getListOptions(db *ora.Ses, objType string) (ListOptions, error) {
	var resp ListOptions
	var err error
	var stmt *ora.Stmt
	query := `SELECT 
		GLOBAL_FILTER, LOCAL_FILTER, REMOTE_FILTER, PAGINATION, 
		PAGE_SIZE, PIVOT, DETAIL, TOTAL
		FROM LIST_CONFIG
		WHERE OBJECT_TYPE = '` + objType + `'`

	stmt, err = db.Prep(query, ora.U32, ora.U32, ora.U32, ora.U32,
		ora.U64, ora.U64, ora.U32, ora.U32)
	if err != nil {
		return ListOptions{}, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return ListOptions{}, err
	}
	if rset.Next() {
		resp.GlobalFilter = rset.Row[0].(uint32) != 0
		resp.LocalFilters = rset.Row[1].(uint32) != 0
		resp.RemoteFilters = rset.Row[2].(uint32) != 0
		resp.Pagination = rset.Row[3].(uint32) != 0
		resp.PageSize = rset.Row[4].(uint64)
		resp.Pivot = rset.Row[5].(uint64) != 0
		resp.Detail = rset.Row[6].(uint32) != 0
		resp.Total = rset.Row[7].(uint32) != 0
	}
	if rset.Err != nil {
		return ListOptions{}, rset.Err
	}
	return resp, nil
}

// getListParent returns list parent node slice for the provided object type.
func getListParent(db *ora.Ses, objType string) ([]ListParentNode, error) {
	resp := make([]ListParentNode, 0)
	var err error
	var stmt *ora.Stmt
	query := `SELECT 
		PARENT_OBJECT_TYPE, PARENT_LABEL_FIELD, PARENT_FILTER_FIELD
		FROM LIST_CONFIG_CHILD
		WHERE OBJECT_TYPE = '` + objType + `'`

	stmt, err = db.Prep(query, ora.S, ora.S, ora.S)
	if err != nil {
		return resp, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return resp, err
	}
	for rset.Next() {
		resp = append(resp, ListParentNode{
			ObjectType: rset.Row[0].(string),
			LabelField: rset.Row[1].(string),
			FilterField: rset.Row[2].(string),
		})
	}
	if rset.Err != nil {
		return nil, rset.Err
	}

	return resp, nil
}

// getListPivot list pivot slice for the provided object type.
func getListPivot(db *ora.Ses, objType string) ([]ListPivot, error) {
	resp := make([]ListPivot, 0)
	var err error
	var stmt *ora.Stmt
	query := `SELECT 
		OBJECT_TYPE, GROUP_FIELD, DISTINCT_FIELD, VALUE_FIELD
		FROM LIST_PIVOTS
		WHERE OBJECT_TYPE = '` + objType + `'`

	stmt, err = db.Prep(query, ora.S, ora.S, ora.S, ora.S)
	if err != nil {
		return resp, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return resp, err
	}
	for rset.Next() {
		resp = append(resp, ListPivot{
			ObjectType: rset.Row[0].(string),
			GroupField: rset.Row[1].(string),
			DistinctField: rset.Row[2].(string),
			Value: rset.Row[3].(string),
		})
	}
	if rset.Err != nil {
		return nil, rset.Err
	}

	return resp, nil
}

// getListDetails returns list details for the provided object type.
func getListDetails(db *ora.Ses, objType string) (ListDetails, error) {
	var resp ListDetails
	var err error
	var stmt *ora.Stmt
	query := `SELECT 
		OBJECT_TYPE, PARENT_OBJECT_TYPE, PARENT_FILTER_FIELD, SINGLE_DETAIL
		FROM LIST_CONFIG_DETAIL
		WHERE PARENT_OBJECT_TYPE = '` + objType + `'`

	stmt, err = db.Prep(query, ora.S, ora.S, ora.S, ora.U32)
	if err != nil {
		return resp, err
	}
	defer stmt.Close()

	rset, err := stmt.Qry()
	if err != nil {
		return resp, err
	}
	if rset.Next() {
		resp.ObjectType = rset.Row[0].(string)
		resp.ParentObjectType = rset.Row[1].(string)
		resp.ParentFilterField = rset.Row[2].(string)
		resp.SingleDetail = rset.Row[3].(uint32) != 0
	}
	if rset.Err != nil {
		return resp, rset.Err
	}

	return resp, nil
}