package orm

import (
	"strings"
)

const (
	ExprSep = "__"
)

type condValue struct {
	exprs  []string
	args   []interface{}
	cond   *Condition
	isOr   bool
	isNot  bool
	isCond bool
}

type Condition struct {
	params []condValue
}

func NewCondition() *Condition {
	c := &Condition{}
	return c
}

func (c *Condition) And(expr string, args ...interface{}) *Condition {
	if expr == "" || len(args) == 0 {
		panic("<Condition.And> args cannot empty")
	}
	c.params = append(c.params, condValue{exprs: strings.Split(expr, ExprSep), args: args})
	return c
}

func (c *Condition) AndNot(expr string, args ...interface{}) *Condition {
	if expr == "" || len(args) == 0 {
		panic("<Condition.AndNot> args cannot empty")
	}
	c.params = append(c.params, condValue{exprs: strings.Split(expr, ExprSep), args: args, isNot: true})
	return c
}

func (c *Condition) AndCond(cond *Condition) *Condition {
	if c == cond {
		panic("cannot use self as sub cond")
	}
	if cond != nil {
		c.params = append(c.params, condValue{cond: cond, isCond: true})
	}
	return c
}

func (c *Condition) Or(expr string, args ...interface{}) *Condition {
	if expr == "" || len(args) == 0 {
		panic("<Condition.Or> args cannot empty")
	}
	c.params = append(c.params, condValue{exprs: strings.Split(expr, ExprSep), args: args, isOr: true})
	return c
}

func (c *Condition) OrNot(expr string, args ...interface{}) *Condition {
	if expr == "" || len(args) == 0 {
		panic("<Condition.OrNot> args cannot empty")
	}
	c.params = append(c.params, condValue{exprs: strings.Split(expr, ExprSep), args: args, isNot: true, isOr: true})
	return c
}

func (c *Condition) OrCond(cond *Condition) *Condition {
	if c == cond {
		panic("cannot use self as sub cond")
	}
	if cond != nil {
		c.params = append(c.params, condValue{cond: cond, isCond: true, isOr: true})
	}
	return c
}

func (c *Condition) IsEmpty() bool {
	return len(c.params) == 0
}

func (c Condition) Clone() *Condition {
	params := c.params
	c.params = make([]condValue, len(params))
	copy(c.params, params)
	return &c
}

func (c *Condition) Merge() (expr string, args []interface{}) {
	return expr, args
}