package clause

import (
	
	
	
	
)

// Expression expression interface
type Expression interface {
	Build(builder Builder)
}

// NegationExpressionBuilder negation expression builder
type NegationExpressionBuilder interface {
	NegationBuild(builder Builder)
}

// Expr raw expression
type Expr struct {
	SQL                string
	Vars               []interface{}
	WithoutParentheses bool
}

// Build build raw expression
func ( Expr) ( Builder) {
	var (
		 bool
		              int
	)

	for ,  := range []byte(.SQL) {
		if  == '?' && len(.Vars) >  {
			if  || .WithoutParentheses {
				if ,  := .Vars[].(driver.Valuer);  {
					.AddVar(, .Vars[])
				} else {
					switch  := reflect.ValueOf(.Vars[]); .Kind() {
					case reflect.Slice, reflect.Array:
						if .Len() == 0 {
							.AddVar(, nil)
						} else {
							for  := 0;  < .Len(); ++ {
								if  > 0 {
									.WriteByte(',')
								}
								.AddVar(, .Index().Interface())
							}
						}
					default:
						.AddVar(, .Vars[])
					}
				}
			} else {
				.AddVar(, .Vars[])
			}

			++
		} else {
			if  == '(' {
				 = true
			} else {
				 = false
			}
			.WriteByte()
		}
	}

	if  < len(.Vars) {
		for ,  := range .Vars[:] {
			.AddVar(, sql.NamedArg{Value: })
		}
	}
}

// NamedExpr raw expression for named expr
type NamedExpr struct {
	SQL  string
	Vars []interface{}
}

// Build build raw expression
func ( NamedExpr) ( Builder) {
	var (
		              int
		           bool
		 bool
		         = make(map[string]interface{}, len(.Vars))
	)

	for ,  := range .Vars {
		switch value := .(type) {
		case sql.NamedArg:
			[.Name] = .Value
		case map[string]interface{}:
			for ,  := range  {
				[] = 
			}
		default:
			var  func(reflect.Value)
			 = func( reflect.Value) {
				 = reflect.Indirect()
				switch .Kind() {
				case reflect.Struct:
					 := .Type()
					for  := 0;  < .NumField(); ++ {
						if  := .Field(); ast.IsExported(.Name) {
							[.Name] = .Field().Interface()

							if .Anonymous {
								(.Field())
							}
						}
					}
				}
			}

			(reflect.ValueOf())
		}
	}

	 := make([]byte, 0, 10)

	for ,  := range []byte(.SQL) {
		if  == '@' && ! {
			 = true
			 = [:0]
		} else if  == ' ' ||  == ',' ||  == ')' ||  == '"' ||  == '\'' ||  == '`' ||  == '\r' ||  == '\n' ||  == ';' {
			if  {
				if ,  := [string()];  {
					.AddVar(, )
				} else {
					.WriteByte('@')
					.WriteString(string())
				}
				 = false
			}

			 = false
			.WriteByte()
		} else if  == '?' && len(.Vars) >  {
			if  {
				if ,  := .Vars[].(driver.Valuer);  {
					.AddVar(, .Vars[])
				} else {
					switch  := reflect.ValueOf(.Vars[]); .Kind() {
					case reflect.Slice, reflect.Array:
						if .Len() == 0 {
							.AddVar(, nil)
						} else {
							for  := 0;  < .Len(); ++ {
								if  > 0 {
									.WriteByte(',')
								}
								.AddVar(, .Index().Interface())
							}
						}
					default:
						.AddVar(, .Vars[])
					}
				}
			} else {
				.AddVar(, .Vars[])
			}

			++
		} else if  {
			 = append(, )
		} else {
			if  == '(' {
				 = true
			} else {
				 = false
			}
			.WriteByte()
		}
	}

	if  {
		if ,  := [string()];  {
			.AddVar(, )
		} else {
			.WriteByte('@')
			.WriteString(string())
		}
	}
}

// IN Whether a value is within a set of values
type IN struct {
	Column interface{}
	Values []interface{}
}

func ( IN) ( Builder) {
	.WriteQuoted(.Column)

	switch len(.Values) {
	case 0:
		.WriteString(" IN (NULL)")
	case 1:
		if ,  := .Values[0].([]interface{}); ! {
			.WriteString(" = ")
			.AddVar(, .Values[0])
			break
		}

		fallthrough
	default:
		.WriteString(" IN (")
		.AddVar(, .Values...)
		.WriteByte(')')
	}
}

func ( IN) ( Builder) {
	.WriteQuoted(.Column)
	switch len(.Values) {
	case 0:
		.WriteString(" IS NOT NULL")
	case 1:
		if ,  := .Values[0].([]interface{}); ! {
			.WriteString(" <> ")
			.AddVar(, .Values[0])
			break
		}

		fallthrough
	default:
		.WriteString(" NOT IN (")
		.AddVar(, .Values...)
		.WriteByte(')')
	}
}

// Eq equal to for where
type Eq struct {
	Column interface{}
	Value  interface{}
}

func ( Eq) ( Builder) {
	.WriteQuoted(.Column)

	switch .Value.(type) {
	case []string, []int, []int32, []int64, []uint, []uint32, []uint64, []interface{}:
		 := reflect.ValueOf(.Value)
		if .Len() == 0 {
			.WriteString(" IN (NULL)")
		} else {
			.WriteString(" IN (")
			for  := 0;  < .Len(); ++ {
				if  > 0 {
					.WriteByte(',')
				}
				.AddVar(, .Index().Interface())
			}
			.WriteByte(')')
		}
	default:
		if eqNil(.Value) {
			.WriteString(" IS NULL")
		} else {
			.WriteString(" = ")
			.AddVar(, .Value)
		}
	}
}

func ( Eq) ( Builder) {
	Neq().Build()
}

// Neq not equal to for where
type Neq Eq

func ( Neq) ( Builder) {
	.WriteQuoted(.Column)

	switch .Value.(type) {
	case []string, []int, []int32, []int64, []uint, []uint32, []uint64, []interface{}:
		.WriteString(" NOT IN (")
		 := reflect.ValueOf(.Value)
		for  := 0;  < .Len(); ++ {
			if  > 0 {
				.WriteByte(',')
			}
			.AddVar(, .Index().Interface())
		}
		.WriteByte(')')
	default:
		if eqNil(.Value) {
			.WriteString(" IS NOT NULL")
		} else {
			.WriteString(" <> ")
			.AddVar(, .Value)
		}
	}
}

func ( Neq) ( Builder) {
	Eq().Build()
}

// Gt greater than for where
type Gt Eq

func ( Gt) ( Builder) {
	.WriteQuoted(.Column)
	.WriteString(" > ")
	.AddVar(, .Value)
}

func ( Gt) ( Builder) {
	Lte().Build()
}

// Gte greater than or equal to for where
type Gte Eq

func ( Gte) ( Builder) {
	.WriteQuoted(.Column)
	.WriteString(" >= ")
	.AddVar(, .Value)
}

func ( Gte) ( Builder) {
	Lt().Build()
}

// Lt less than for where
type Lt Eq

func ( Lt) ( Builder) {
	.WriteQuoted(.Column)
	.WriteString(" < ")
	.AddVar(, .Value)
}

func ( Lt) ( Builder) {
	Gte().Build()
}

// Lte less than or equal to for where
type Lte Eq

func ( Lte) ( Builder) {
	.WriteQuoted(.Column)
	.WriteString(" <= ")
	.AddVar(, .Value)
}

func ( Lte) ( Builder) {
	Gt().Build()
}

// Like whether string matches regular expression
type Like Eq

func ( Like) ( Builder) {
	.WriteQuoted(.Column)
	.WriteString(" LIKE ")
	.AddVar(, .Value)
}

func ( Like) ( Builder) {
	.WriteQuoted(.Column)
	.WriteString(" NOT LIKE ")
	.AddVar(, .Value)
}

func eqNil( interface{}) bool {
	if ,  := .(driver.Valuer);  && !eqNilReflect() {
		, _ = .Value()
	}

	return  == nil || eqNilReflect()
}

func eqNilReflect( interface{}) bool {
	 := reflect.ValueOf()
	return .Kind() == reflect.Ptr && .IsNil()
}