package sqlite3

import (
	"runtime"
	"strconv"
	"strings"
)

type Error struct {
	Code         ErrorCode
	ExtendedCode ExtendedErrorCode
	str          string
	msg          string
}

func (e *Error) Error() string {
	var b strings.Builder
	b.WriteString("sqlite3: ")

	if e.str != "" {
		b.WriteString(e.str)
	} else {
		b.WriteString(strconv.Itoa(int(e.Code)))
	}

	if e.msg != "" {
		b.WriteByte(':')
		b.WriteByte(' ')
		b.WriteString(e.msg)
	}

	return b.String()
}

type errorString string

func (e errorString) Error() string { return string(e) }

const (
	nilErr      = errorString("sqlite3: invalid memory address or null pointer dereference")
	oomErr      = errorString("sqlite3: out of memory")
	rangeErr    = errorString("sqlite3: index out of range")
	noNulErr    = errorString("sqlite3: missing NUL terminator")
	noGlobalErr = errorString("sqlite3: could not find global: ")
	noFuncErr   = errorString("sqlite3: could not find function: ")
)

func assertErr() errorString {
	msg := "sqlite3: assertion failed"
	if _, file, line, ok := runtime.Caller(1); ok {
		msg += " (" + file + ":" + strconv.Itoa(line) + ")"
	}
	return errorString(msg)
}