removing driver, just generating mock struct args would need an order

- ready to test
- slice size bugfixes
- appending empty struct before filling it out

.gitignore

@@ -15,7 +15,15 @@
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum
+
 # env file
 .env
 
-cmd/*
+#ignore test files
+cmd/

lazy.go

@@ -1,14 +1,12 @@
 package lazy
 
 import (
-	"database/sql"
 	"database/sql/driver"
 	"errors"
 	"fmt"
 	"math/rand/v2"
 	"reflect"
 	"regexp"
-	"time"
 
 	"github.com/jmoiron/sqlx"
 )
@@ -17,61 +15,71 @@ const (
 	DB_TAG    = "db"   //tag used to parse sql fields in example struct
 	LAZY_TAG  = "lazy" //tag label for KEY_VALUE
 	KEY_VALUE = "key"  //tag value for LAZY_TAG
-	//bind values
-	BindQuestion Binds = 1
-	BindDollar   Binds = 2
-	BindNamed    Binds = 3
-	BindAt       Binds = 4
 )
 
-type Binds int
+var (
+	ErrBadExample  = errors.New("example field must be a non-nil struct")
+	ErrMissingKeys = errors.New("there must be a key for each row requested with RowCount")
+	//contains placeholder to inject type on runtime
+	ErrUnsupportedType = errors.New("type: %s is not yet supported")
+)
 
 // mock data generated based on config
-type Mock struct {
+type RowMock struct {
 	Query   string
 	Columns []string
 	Rows    [][]driver.Value
 }
 
 // configuration for RandomGenerate
-type Config struct {
+type RowConfig struct {
 	Query    string
 	Example  any
-	Keys     []any //length of keys must = RowCount, if set
+	Keys     []any
 	RowCount int
-	BindType Binds
+}
+
+type StructConfig struct {
+	Query    string
+	Example  any
+	RowCount int
+}
+
+type StructMock struct {
+	Query       string
+	MockStructs []any
 }
 
 // generates mock data based on configuration to be used for sqlmock
-func RandomGenerate(m Config) (*Mock, error) {
+func RandomRows(r RowConfig) (*RowMock, error) {
 	//example struct cannot be nil and must be a struct
-	if m.Example == nil {
-		return nil, errors.New("example value cannot be nil")
+	if r.Example == nil {
+		return nil, ErrBadExample
 	}
-	if reflect.ValueOf(m.Example).Kind() != reflect.Struct {
-		return nil, errors.New("example value must be a struct")
+	if reflect.ValueOf(r.Example).Kind() != reflect.Struct {
+		return nil, ErrBadExample
 	}
 
 	//any weirdness, just pull one row
-	if m.RowCount <= 0 {
-		m.RowCount = 1
+	if r.RowCount <= 0 {
+		r.RowCount = 1
 	}
 
 	//if keys are set, ensure there are enough to populate requested rows
 	primaryKey := false
-	if len(m.Keys) > 0 {
+	if len(r.Keys) > 0 {
 		primaryKey = true
-		if len(m.Keys) != m.RowCount {
-			return nil, errors.New("you must provide a key for each row")
+		if len(r.Keys) != r.RowCount {
+			return nil, ErrMissingKeys
 		}
 	}
 
-	retType := reflect.TypeOf(m.Example)
+	retType := reflect.TypeOf(r.Example)
 	maxFieldCount := retType.NumField()
 	columns := make([]string, 0, maxFieldCount)
 	rows := make([][]driver.Value, 0)
 
-	for y := 0; y < m.RowCount; y++ {
+	for y := 0; y < r.RowCount; y++ {
 		rows = append(rows, make([]driver.Value, 0))
 		for x := 0; x < maxFieldCount; x++ {
 			field := retType.Field(x)
@@ -87,94 +95,86 @@ func RandomGenerate(m Config) (*Mock, error) {
 
 			//if field has lazy:"key" tag and tags are present inject primary key
 			if field.Tag.Get(LAZY_TAG) == KEY_VALUE && primaryKey {
-				rows[y] = append(rows[y], m.Keys[y])
+				rows[y] = append(rows[y], r.Keys[y])
 				continue
 			}
 
+			//generate random values
 			nv := kindToRandom(field)
 			if nv == nil {
-				return nil, fmt.Errorf("could not match type: %s", retType.Name())
+				return nil, fmt.Errorf(ErrUnsupportedType.Error(), field.Type.Name())
 			}
 
 			rows[y] = append(rows[y], nv)
 		}
 	}
 
-	return &Mock{
+	return &RowMock{
 		//sql is rebound and escaped for sqlmock.ExpectQuery
-		Query:   sqlx.Rebind(int(m.BindType), regexp.QuoteMeta(m.Query)),
+		Query:   sqlx.Rebind(sqlx.AT, regexp.QuoteMeta(r.Query)),
 		Columns: columns,
 		Rows:    rows,
 	}, nil
 }
 
-// converts basic reflect Kind's to psuedo-random data, slices are given a random amount of entries
-func kindToRandom(field reflect.StructField) any {
-	//this isn't ideal, but since the sql types are structs they were being filled in a weird
-	//manner. For now we check those types first, and will clean this up later.
-	switch field.Type {
-	case reflect.TypeOf(sql.NullTime{}):
-		var temp sql.NullTime
-		if !isNull() {
-			temp.Valid = true
-			temp.Time = time.Now()
-		}
-		return temp
-	case reflect.TypeOf(sql.NullInt16{}):
-		var temp sql.NullInt16
-		if isNull() {
-			temp.Valid = false
-		} else {
-			temp.Valid = true
-			temp.Int16 = int16(rand.Int())
-		}
-		return temp
-	case reflect.TypeOf(sql.NullInt32{}):
-		var temp sql.NullInt32
-		if isNull() {
-			temp.Valid = false
-		} else {
-			temp.Valid = true
-			temp.Int32 = rand.Int32()
-		}
-		return temp
-	case reflect.TypeOf(sql.NullInt64{}):
-		var temp sql.NullInt64
-		if isNull() {
-			temp.Valid = false
-		} else {
-			temp.Valid = true
-			temp.Int64 = rand.Int64()
-		}
-		return temp
-	case reflect.TypeOf(sql.NullBool{}):
-		var temp sql.NullBool
-		if isNull() {
-			temp.Valid = false
-		} else {
-			temp.Valid = true
-			temp.Bool = (rand.Int()%2 == 0)
-		}
-		return temp
-	case reflect.TypeOf(sql.NullFloat64{}):
-		var temp sql.NullFloat64
-		if isNull() {
-			temp.Valid = false
-		} else {
-			temp.Valid = true
-			temp.Float64 = rand.Float64()
-		}
-		return temp
-	case reflect.TypeOf(sql.NullString{}):
-		var temp sql.NullString
-		if isNull() {
-			temp.Valid = false
-		} else {
-			temp.Valid = true
-			temp.String = fmt.Sprintf("random %d", rand.Int())
-		}
-		return temp
+// generates mock data for insert statements to be used for sqlmock, it also returns a slice of
+// example structs with mock data
+func RandomStruct(c StructConfig) (*StructMock, error) {
+	//make sure we have an example struct
+	if c.Example == nil {
+		return nil, ErrBadExample
 	}
+	if reflect.ValueOf(c.Example).Kind() != reflect.Struct {
+		return nil, ErrBadExample
+	}
+
+	//we need at least one row
+	if c.RowCount <= 0 {
+		c.RowCount = 1
+	}
+
+	//get example type and number of fields
+	retType := reflect.TypeOf(c.Example)
+	maxFieldCount := retType.NumField()
+
+	//create slice of example structs
+	ft := reflect.SliceOf(retType)
+	filled := reflect.MakeSlice(ft, 0, c.RowCount)
+
+	for x := 0; x < c.RowCount; x++ {
+		//add empty example struct
+		filled = reflect.Append(filled, reflect.ValueOf(c.Example))
+		for y := 0; y < maxFieldCount; y++ {
+			field := retType.Field(y)
+
+			//get random value
+			nv := kindToRandom(field)
+			if nv == nil {
+				return nil, fmt.Errorf(ErrUnsupportedType.Error(), field.Type.Name())
+			}
+
+			if filled.Index(x).Field(y).CanSet() {
+				filled.Index(x).Field(y).Set(reflect.ValueOf(nv))
+			}
+		}
+	}
+
+	//convert reflect.Value to []any
+	fl := filled.Len()
+	retStructs := make([]any, fl)
+	for x := 0; x < fl; x++ {
+		retStructs[x] = filled.Index(x).Interface()
+	}
+
+	return &StructMock{
+		Query:       sqlx.Rebind(sqlx.AT, regexp.QuoteMeta(c.Query)),
+		MockStructs: retStructs,
+	}, nil
+}
+
+// converts basic reflect Kind's to psuedo-random data, it is super basic and supports very basic types. Slices and arrays
+// are supported, slices will get 1-10 entries and arrays will fill length
+func kindToRandom(field reflect.StructField) any {
 	kind := field.Type.Kind()
 	switch kind {
 	case reflect.Int:
@@ -188,11 +188,9 @@ func kindToRandom(field reflect.StructField) any {
 	case reflect.Float64:
 		return rand.Float64()
 	case reflect.String:
-		return fmt.Sprintf("random %d", rand.Int())
+		return fmt.Sprintf("%d", rand.Int())
 	case reflect.Bool:
 		return rand.Int()%2 == 0
-	case reflect.TypeOf(time.Time{}).Kind():
-		return time.Now()
 	case reflect.Array:
 		underlying := field.Type.Elem().Kind()
 		count := reflect.ValueOf(field).Len() //fill entire length
@@ -277,7 +275,7 @@ func kindToRandom(field reflect.StructField) any {
 		case reflect.String:
 			var strslice []string
 			for x := 0; x < count; x++ {
-				strslice = append(strslice, fmt.Sprintf("random %d", rand.Int()))
+				strslice = append(strslice, fmt.Sprintf("%d", rand.Int()))
 			}
 			return strslice
 		case reflect.Bool:
@@ -291,14 +289,3 @@ func kindToRandom(field reflect.StructField) any {
 
 	return nil
 }
-
-// a quick and dirty rng function to determine if nulltypes are null or
-// if we will generate a random value
-func isNull() bool {
-	x := rand.IntN(2)
-	if x%2 == 0 {
-		return true
-	} else {
-		return false
-	}
-}