package clause

import "strings"

type Conditions struct {
	queries []string
	args    [][]any
	err     error
}

func NewConditions() *Conditions {
	return &Conditions{
		queries: make([]string, 0),
		args:    make([][]any, 0),
	}
}

func (conditions *Conditions) AddCondition(query string, args ...any) *Conditions {
	conditions.queries = append(conditions.queries, query)
	conditions.args = append(conditions.args, args)
	return conditions
}

func (conditions *Conditions) Equal(columnName string, arg any) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" = ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) Like(columnName string, arg string) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" LIKE ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) In(columnName string, arg any) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" IN ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) NotIn(columnName string, arg any) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" NOT IN ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) Not(columnName string, arg any) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" != ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) LessThan(columnName string, arg any) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" < ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) LessThanAndEqual(columnName string, arg any) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" <= ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) GreaterThan(columnName string, arg any) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" > ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) GreaterThanAndEqual(columnName string, arg any) *Conditions {
	if conditions.err != nil {
		return conditions
	}

	conditions.queries = append(conditions.queries, columnName+" >= ?")
	conditions.args = append(conditions.args, []any{arg})
	return conditions
}

func (conditions *Conditions) And() *And {
	return &And{conditions: conditions}
}

func (conditions *Conditions) Or() *Or {
	return &Or{conditions: conditions}
}

func (conditions *Conditions) formClause(conditionOperator string) (string, error) {
	if conditions.queries == nil || len(conditions.queries) == 0 {
		return "", nil
	}

	stringBuilder := strings.Builder{}
	for i, query := range conditions.queries {
		stringBuilder.WriteString(query)

		if i != len(conditions.queries)-1 {
			stringBuilder.WriteString(" " + conditionOperator + " ")
		}
	}

	return stringBuilder.String(), nil
}

func (conditions *Conditions) formArgs() []any {
	args := make([]any, 0)

	for _, conditionArgs := range conditions.args {
		if conditionArgs == nil {
			continue
		}

		if len(conditionArgs) == 1 {
			args = append(args, conditionArgs[0])
		} else {
			args = append(args, conditionArgs)
		}
	}

	return args
}

type And struct {
	conditions *Conditions
}

func (and *And) Clause() (string, error) {
	return and.conditions.formClause("AND")
}

func (and *And) Args() []any {
	return and.conditions.formArgs()
}

type Or struct {
	conditions *Conditions
}

func (or *Or) Clause() (string, error) {
	return or.conditions.formClause("OR")
}

func (or *Or) Args() []any {
	return or.conditions.formArgs()
}