package mydb

import "git.hexq.cn/tiglog/mydb/internal/adapter"

// OrExpr represents a logical expression joined by logical disjunction (OR).
type OrExpr struct {
	*adapter.LogicalExprGroup
}

// Or adds more expressions to the group.
func (o *OrExpr) Or(orConds ...LogicalExpr) *OrExpr {
	var fn func(*[]LogicalExpr) error
	if len(orConds) > 0 {
		fn = func(in *[]LogicalExpr) error {
			*in = append(*in, orConds...)
			return nil
		}
	}
	return &OrExpr{o.LogicalExprGroup.Frame(fn)}
}

// Empty returns false if the expressions has zero conditions.
func (o *OrExpr) Empty() bool {
	return o.LogicalExprGroup.Empty()
}

// Or joins conditions under logical disjunction. Conditions can be represented
// by `db.Cond{}`, `db.Or()` or `db.And()`.
//
// Example:
//
//	// year = 2012 OR year = 1987
//	db.Or(
//		db.Cond{"year": 2012},
//		db.Cond{"year": 1987},
//	)
func Or(conds ...LogicalExpr) *OrExpr {
	return &OrExpr{adapter.NewLogicalExprGroup(adapter.LogicalOperatorOr, defaultJoin(conds...)...)}
}

var _ = adapter.LogicalExpr(&OrExpr{})