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// Copyright 2018 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package builder

import (
	sql2 "database/sql"
	"fmt"
	"reflect"
	"strings"
	"time"
)

func condToSQL(cond Cond) (string, []interface{}, error) {
	if cond == nil || !cond.IsValid() {
		return "", nil, nil
	}

	w := NewWriter()
	if err := cond.WriteTo(w); err != nil {
		return "", nil, err
	}
	return w.String(), w.args, nil
}

func condToBoundSQL(cond Cond) (string, error) {
	if cond == nil || !cond.IsValid() {
		return "", nil
	}

	w := NewWriter()
	if err := cond.WriteTo(w); err != nil {
		return "", err
	}
	return ConvertToBoundSQL(w.String(), w.args)
}

// ToSQL convert a builder or conditions to SQL and args
func ToSQL(cond interface{}) (string, []interface{}, error) {
	switch cond.(type) {
	case Cond:
		return condToSQL(cond.(Cond))
	case *Builder:
		return cond.(*Builder).ToSQL()
	}
	return "", nil, ErrNotSupportType
}

// ToBoundSQL convert a builder or conditions to parameters bound SQL
func ToBoundSQL(cond interface{}) (string, error) {
	switch cond.(type) {
	case Cond:
		return condToBoundSQL(cond.(Cond))
	case *Builder:
		return cond.(*Builder).ToBoundSQL()
	}
	return "", ErrNotSupportType
}

func noSQLQuoteNeeded(a interface{}) bool {
	if a == nil {
		return false
	}
	switch a.(type) {
	case int, int8, int16, int32, int64:
		return true
	case uint, uint8, uint16, uint32, uint64:
		return true
	case float32, float64:
		return true
	case bool:
		return true
	case string:
		return false
	case time.Time, *time.Time:
		return false
	}

	t := reflect.TypeOf(a)

	switch t.Kind() {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		return true
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
		return true
	case reflect.Float32, reflect.Float64:
		return true
	case reflect.Bool:
		return true
	case reflect.String:
		return false
	}

	return false
}

// ConvertToBoundSQL will convert SQL and args to a bound SQL
func ConvertToBoundSQL(sql string, args []interface{}) (string, error) {
	buf := strings.Builder{}
	var i, j, start int
	for ; i < len(sql); i++ {
		if sql[i] == '?' {
			_, err := buf.WriteString(sql[start:i])
			if err != nil {
				return "", err
			}
			start = i + 1

			if len(args) == j {
				return "", ErrNeedMoreArguments
			}

			arg := args[j]
			if namedArg, ok := arg.(sql2.NamedArg); ok {
				arg = namedArg.Value
			}

			if noSQLQuoteNeeded(arg) {
				_, err = fmt.Fprint(&buf, arg)
			} else {
				// replace ' -> '' (standard replacement) to avoid critical SQL injection,
				// NOTICE: may allow some injection like % (or _) in LIKE query
				_, err = fmt.Fprintf(&buf, "'%v'", strings.Replace(fmt.Sprintf("%v", arg), "'",
					"''", -1))
			}
			if err != nil {
				return "", err
			}
			j = j + 1
		}
	}
	_, err := buf.WriteString(sql[start:])
	if err != nil {
		return "", err
	}
	return buf.String(), nil
}

// ConvertPlaceholder replaces the place holder ? to $1, $2 ... or :1, :2 ... according prefix
func ConvertPlaceholder(sql, prefix string) (string, error) {
	buf := strings.Builder{}
	var i, j, start int
	var ready = true
	for ; i < len(sql); i++ {
		if sql[i] == '\'' && i > 0 && sql[i-1] != '\\' {
			ready = !ready
		}
		if ready && sql[i] == '?' {
			if _, err := buf.WriteString(sql[start:i]); err != nil {
				return "", err
			}

			start = i + 1
			j = j + 1

			if _, err := buf.WriteString(fmt.Sprintf("%v%d", prefix, j)); err != nil {
				return "", err
			}
		}
	}

	if _, err := buf.WriteString(sql[start:]); err != nil {
		return "", err
	}

	return buf.String(), nil
}