{{- $options := .Options -}}

// AUTOGENERATED BY storj.io/dbx
// DO NOT EDIT.

package {{ .Package }}

import (
	"bytes"
	"context"
	"database/sql"
	"errors"
	"fmt"
	"reflect"
	"strconv"
	"strings"
	"time"
	"unicode"
	"sync"

{{- range .ExtraImports }}
	{{ . }}
{{- end }}
)

// Prevent conditional imports from causing build failures.
var _ = strconv.Itoa
var _ = strings.LastIndex
var _ = fmt.Sprint
var _ sync.Mutex

var (
	WrapErr = func(err *Error) error {return err}
	Logger func(format string, args ...interface{})
	ShouldRetry func(driver string, err error) bool

	errTooManyRows = errors.New("too many rows")
	errUnsupportedDriver = errors.New("unsupported driver")
	errEmptyUpdate = errors.New("empty update")
)

func logError(format string, args ...interface{}) {
	if Logger != nil {
		Logger(format, args...)
	}
}

type ErrorCode int

const (
	ErrorCode_Unknown ErrorCode = iota
	ErrorCode_UnsupportedDriver
	ErrorCode_NoRows
	ErrorCode_TxDone
	ErrorCode_TooManyRows
	ErrorCode_ConstraintViolation
	ErrorCode_EmptyUpdate
)

type Error struct {
	Err error
	Code ErrorCode
	Driver string
	Constraint string
	QuerySuffix string
}

func (e *Error) Error() string {
	return e.Err.Error()
}

func wrapErr(e *Error) error {
	if WrapErr == nil {
		return e
	}
	return WrapErr(e)
}

func makeErr(err error) error {
	if err == nil {
		return nil
	}
	e := &Error{Err: err}
	switch err {
	case sql.ErrNoRows:
		e.Code = ErrorCode_NoRows
	case sql.ErrTxDone:
		e.Code = ErrorCode_TxDone
	}
	return wrapErr(e)
}

func shouldRetry(driver string, err error) bool {
  if ShouldRetry == nil {
    return false
  }
  return ShouldRetry(driver, err)
}

func unsupportedDriver(driver string) error {
	return wrapErr(&Error{
		Err: errUnsupportedDriver,
		Code: ErrorCode_UnsupportedDriver,
		Driver: driver,
	})
}

func emptyUpdate() error {
	return wrapErr(&Error{
		Err: errEmptyUpdate,
		Code: ErrorCode_EmptyUpdate,
	})
}

func tooManyRows(query_suffix string) error {
	return wrapErr(&Error{
		Err: errTooManyRows,
		Code: ErrorCode_TooManyRows,
		QuerySuffix: query_suffix,
	})
}

func constraintViolation(err error, constraint string) error {
	return wrapErr(&Error{
		Err: err,
		Code: ErrorCode_ConstraintViolation,
		Constraint: constraint,
	})
}

type driver interface {
	ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
	QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
	QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
}

var (
	notAPointer = errors.New("destination not a pointer")
	lossyConversion = errors.New("lossy conversion")
)

type DB struct {
	*sql.DB
	dbMethods

	Hooks struct {
		Now func() time.Time
	}

	driver string
}

func Open(driver, source string) (db *DB, err error) {
	var sql_db *sql.DB
	switch driver {
{{- range .Dialects }}
	case {{ .Name | printf "%q" }}:
		sql_db, err = open{{ .Name }}(source)
{{- end }}
	default:
		return nil, unsupportedDriver(driver)
	}
	if err != nil {
		return nil, makeErr(err)
	}
	defer func(sql_db *sql.DB) {
		if err != nil {
			sql_db.Close()
		}
	}(sql_db)

	if err := sql_db.Ping(); err != nil {
		return nil, makeErr(err)
	}

	db = &DB{
		DB: sql_db,

		driver: driver,
	}
	db.Hooks.Now = time.Now

	switch driver {
{{- range .Dialects }}
	case {{ .Name | printf "%q" }}:
		db.dbMethods = new{{ .Name }}(db)
{{- end }}
	default:
		return nil, unsupportedDriver(driver)
	}

	return db, nil
}

func (obj *DB) Close() (err error) {
	return obj.makeErr(obj.DB.Close())
}

func (obj *DB) Open(ctx context.Context) (*Tx, error) {
	tx, err := obj.DB.BeginTx(ctx, nil)
	if err != nil {
		return nil, obj.makeErr(err)
	}

	return &Tx{
		Tx: tx,
		txMethods: obj.wrapTx(tx),
	}, nil
}
{{ if $options.SupportRx }}
func (obj *DB) NewRx() *Rx {
	return &Rx{db: obj}
}
{{ end }}
func DeleteAll(ctx context.Context, db *DB) (int64, error) {
	tx, err := db.Open(ctx)
	if err != nil {
		return 0, err
	}
	defer func() {
		if err == nil {
			err = db.makeErr(tx.Commit())
			return
		}

		if err_rollback := tx.Rollback(); err_rollback != nil {
			logError("delete-all: rollback failed: %v", db.makeErr(err_rollback))
		}
	}()
	return tx.deleteAll(ctx)
}

type Tx struct {
	Tx *sql.Tx
	txMethods
}

type dialectTx struct {
	tx *sql.Tx
}

func (tx *dialectTx) Commit() (err error) {
	return makeErr(tx.tx.Commit())
}

func (tx *dialectTx) Rollback() (err error) {
	return makeErr(tx.tx.Rollback())
}

{{- range .Dialects }}

{{- $dbtype := .Name | printf "%sDB" -}}
{{- $txtype := .Name | printf "%sTx" -}}
{{- $impltype := .Name | printf "%sImpl" }}

type {{ $impltype }} struct {
	db      *DB
	dialect __sqlbundle_{{ .Name }}
	driver  driver
	txn     bool
}

func (obj *{{ $impltype }}) Rebind(s string) string {
	return obj.dialect.Rebind(s)
}

func (obj *{{ $impltype }}) logStmt(stmt string, args... interface{}) {
	{{ .Name }}LogStmt(stmt, args...)
}

func (obj *{{ $impltype }}) makeErr(err error) error {
	constraint, ok := obj.isConstraintError(err)
	if ok {
		return constraintViolation(err, constraint)
	}
	return makeErr(err)
}

func (obj *{{ $impltype }}) shouldRetry(err error) bool {
  return !obj.txn && shouldRetry(obj.db.driver, err)
}

type {{ $impltype }}_retryingRow struct {
  obj *{{ $impltype }}
  ctx context.Context
  query string
  args []interface{}
}

func (obj *{{ $impltype }}) queryRowContext(ctx context.Context, query string, args ...interface{}) *{{ $impltype }}_retryingRow {
  return &{{ $impltype }}_retryingRow{
    obj: obj,
    ctx: ctx,
    query: query,
    args: args,
  }
}

func (rows *{{ $impltype }}_retryingRow) Scan(dest ...interface{}) error {
  for {
    err := rows.obj.driver.QueryRowContext(rows.ctx, rows.query, rows.args...).Scan(dest...)
    if err != nil {
      if rows.obj.shouldRetry(err) {
        continue
      }
      // caller will wrap this error
      return err
    }
    return nil
  }
}

type {{ $dbtype }} struct {
	db *DB
	*{{ $impltype }}
}

func new{{ .Name }}(db *DB) *{{ $dbtype }} {
	return &{{ $dbtype }}{
		db: db,
		{{ $impltype }}: &{{ $impltype }}{
			db:      db,
			driver:  db.DB,
		},
	}
}

func (obj *{{ $dbtype }}) Schema() string {
	return `{{ .SchemaSQL }}`
}

func (obj *{{ $dbtype }}) wrapTx(tx *sql.Tx) txMethods {
	return &{{ $txtype }}{
		dialectTx: dialectTx{tx: tx},
		{{ $impltype }}: &{{ $impltype }}{
			db:      obj.db,
			driver:  tx,
			txn:     true,
		},
	}
}

type {{ $txtype }} struct {
	dialectTx
	*{{ $impltype }}
}

func {{ .Name }}LogStmt(stmt string, args ...interface{}) {
	// TODO: render placeholders
	if Logger != nil {
		out := fmt.Sprintf("stmt: %s\nargs: %v\n", stmt, pretty(args))
		Logger(out)
	}
}

{{- end }}

type pretty []interface{}

func (p pretty) Format(f fmt.State, c rune) {
	fmt.Fprint(f, "[")
nextval:
	for i, val := range p {
		if i > 0 {
			fmt.Fprint(f, ", ")
		}
		rv := reflect.ValueOf(val)
		if rv.Kind() == reflect.Ptr {
			if rv.IsNil() {
				fmt.Fprint(f, "NULL")
				continue
			}
			val = rv.Elem().Interface()
		}
		switch v := val.(type) {
		case string:
			fmt.Fprintf(f, "%q", v)
		case time.Time:
			fmt.Fprintf(f, "%s", v.Format(time.RFC3339Nano))
		case []byte:
			for _, b := range v {
				if !unicode.IsPrint(rune(b)) {
					fmt.Fprintf(f, "%#x", v)
					continue nextval
				}
			}
			fmt.Fprintf(f, "%q", v)
		default:
			fmt.Fprintf(f, "%v", v)
		}
	}
	fmt.Fprint(f, "]")
}

{{ range .Structs }}
{{- $struct := .Name -}}
{{- $createstruct := .CreateStructName -}}
{{- $updatestruct := .UpdateStructName }}

type {{ $struct }} struct {
{{- range .Fields }}
	{{ .Name }} {{ .Type }}
{{- end }}
{{- if $options.SupportUserdata }}

	userdata_mu sync.Mutex
	userdata    interface{}
{{- end}}
}

func ({{ $struct }}) _Table() string { return "{{ .Table }}" }

{{- if .InsertableOptionalFields }}

type {{ $createstruct }} struct {
{{- range .InsertableOptionalFields }}
	{{ .Name }} {{ .StructName }}
{{- end }}
}

{{- end }}

type {{ $updatestruct }} struct {
{{- range .UpdatableFields }}
	{{ .Name }} {{ .StructName }}
{{- end }}
}

{{- range .Fields }}
{{- $fstruct := .StructName }}
{{- $ctor := printf "%s_%s" .ModelName .Name }}

type {{ $fstruct }} struct {
	_set bool
	_null bool
	_value {{ .Type }}
}

func {{ $ctor }}(v {{ .CtorValue }}) {{ $fstruct }} {
{{- if .MutateFn }}
	v = {{ .MutateFn }}(v)
{{- end }}
	return {{ $fstruct }}{ _set: true, _value: {{ if .TakeAddr }}&{{ end }}v }
}
{{ if .Nullable }}
func {{ $ctor }}_Raw(v {{ .Type }}) {{ $fstruct }} {
	if v == nil {
		return {{ $ctor }}_Null()
	}
	return {{ $ctor }}({{ if .TakeAddr }}*{{ end }}v)
}

func {{ $ctor }}_Null() {{ $fstruct }} {
	return {{ $fstruct }}{ _set: true, _null: true }
}

func (f {{ $fstruct }}) isnull() bool {	return !f._set || f._null || f._value == nil }
{{ end }}

func (f {{ $fstruct }}) value() interface{} { if !f._set || f._null { return nil }; return f._value }

func ({{ $fstruct }}) _Column() string { return "{{ .Column }}" }

{{- end -}}
{{- end }}

func toUTC(t time.Time) time.Time {
	return t.UTC()
}

func toDate(t time.Time) time.Time {
	// keep up the minute portion so that translations between timezones will
	// continue to reflect properly.
	return t.Truncate(time.Minute)
}

//
// runtime support for building sql statements
//

{{ .SQLSupport }}

//
// end runtime support for building sql statements
//