package rest

import (
	"context"
	"encoding/json"
	"git.nobla.cn/golang/kos/util/arrays"
	"git.nobla.cn/golang/rest/types"
	"net/http"
	"strings"
)

func findCondition(schema *types.Schema, conditions []*types.Condition) *types.Condition {
	for _, cond := range conditions {
		if cond.Column == schema.Column {
			return cond
		}
	}
	return nil
}

func BuildConditions(ctx context.Context, r *http.Request, query *Query, schemas []*types.Schema) (err error) {
	var (
		ok          bool
		skip        bool
		formValue   string
		activeQuery ActiveQuery
	)
	if activeQuery, ok = query.Model().(ActiveQuery); ok {
		if err = activeQuery.BeforeQuery(ctx, query); err != nil {
			return
		}
	}
	if arrays.Exists(r.Method, []string{http.MethodPut, http.MethodPost}) {
		conditions := make([]*types.Condition, 0)
		if err = json.NewDecoder(r.Body).Decode(&conditions); err != nil {
			return
		}
		for _, row := range schemas {
			if row.Native == 0 {
				continue
			}
			cond := findCondition(row, conditions)
			if cond == nil {
				continue
			}
			switch row.Format {
			case types.FormatInteger, types.FormatFloat, types.FormatTimestamp, types.FormatDatetime, types.FormatDate, types.FormatTime:
				switch cond.Expr {
				case types.OperatorBetween:
					if len(cond.Values) == 2 {
						query.AndFilterWhere(newCondition(row.Column, cond.Values[0]).WithExpr(">="))
						query.AndFilterWhere(newCondition(row.Column, cond.Values[1]).WithExpr("<="))
					}
				case types.OperatorGreaterThan:
					query.AndFilterWhere(newCondition(row.Column, cond.Value).WithExpr(">"))
				case types.OperatorGreaterEqual:
					query.AndFilterWhere(newCondition(row.Column, cond.Value).WithExpr(">="))
				case types.OperatorLessThan:
					query.AndFilterWhere(newCondition(row.Column, cond.Value).WithExpr("<"))
				case types.OperatorLessEqual:
					query.AndFilterWhere(newCondition(row.Column, cond.Value).WithExpr("<="))
				default:
					query.AndFilterWhere(newCondition(row.Column, cond.Value))
				}
			default:
				switch cond.Expr {
				case types.OperatorLike:
					query.AndFilterWhere(newCondition(row.Column, cond.Value).WithExpr("LIKE"))
				default:
					query.AndFilterWhere(newCondition(row.Column, cond.Value))
				}
			}
		}
	} else {
		qs := r.URL.Query()
		for _, row := range schemas {
			skip = false
			if skip {
				continue
			}
			if row.Native == 0 {
				continue
			}
			formValue = qs.Get(row.Column)
			switch row.Format {
			case types.FormatString, types.FormatText:
				if row.Attribute.Match == types.MatchExactly {
					query.AndFilterWhere(newCondition(row.Column, formValue))
				} else {
					query.AndFilterWhere(newCondition(row.Column, formValue).WithExpr("LIKE"))
				}
			case types.FormatTime, types.FormatDate, types.FormatDatetime, types.FormatTimestamp:
				var sep string
				seps := []byte{',', '/'}
				for _, s := range seps {
					if strings.IndexByte(formValue, s) > -1 {
						sep = string(s)
					}
				}
				if ss := strings.Split(formValue, sep); len(ss) == 2 {
					query.AndFilterWhere(
						newCondition(row.Column, strings.TrimSpace(ss[0])).WithExpr(">="),
						newCondition(row.Column, strings.TrimSpace(ss[1])).WithExpr("<="),
					)
				} else {
					query.AndFilterWhere(newCondition(row.Column, formValue))
				}
			case types.FormatInteger, types.FormatFloat:
				query.AndFilterWhere(newCondition(row.Column, formValue))
			default:
				if row.Type == types.TypeString {
					if row.Attribute.Match == types.MatchExactly {
						query.AndFilterWhere(newCondition(row.Column, formValue))
					} else {
						query.AndFilterWhere(newCondition(row.Column, formValue).WithExpr("LIKE"))
					}
				} else {
					query.AndFilterWhere(newCondition(row.Column, formValue))
				}
			}
		}
	}
	sortPar := r.FormValue("sort")
	if sortPar != "" {
		sorts := strings.Split(sortPar, ",")
		for _, s := range sorts {
			if s[0] == '-' {
				query.OrderBy(s[1:], "DESC")
			} else {
				if s[0] == '+' {
					query.OrderBy(s[1:], "ASC")
				} else {
					query.OrderBy(s, "ASC")
				}
			}
		}
	}
	if activeQuery, ok = query.Model().(ActiveQuery); ok {
		if err = activeQuery.AfterQuery(ctx, query); err != nil {
			return
		}
	}
	return
}