package generator

import (
	"fmt"
	"strings"

	"github.com/edmand46/arpack/parser"
)

// GenerateTypeScript generates TypeScript code for the given messages
func GenerateTypeScript(messages []parser.Message, namespace string) ([]byte, error) {
	return GenerateTypeScriptSchema(parser.Schema{Messages: messages}, namespace)
}

// GenerateTypeScriptSchema generates TypeScript code from a schema
func GenerateTypeScriptSchema(schema parser.Schema, namespace string) ([]byte, error) {
	messages := schema.Messages
	var b strings.Builder

	b.WriteString("// <auto-generated> arpack </auto-generated>\n")
	b.WriteString("// Code generated by arpack. DO NOT EDIT.\n\n")

	enumNames := make(map[string]struct{}, len(schema.Enums))
	for _, enum := range schema.Enums {
		enumNames[enum.Name] = struct{}{}
	}

	// Generate enums
	for _, enum := range schema.Enums {
		writeTSEnum(&b, enum)
		b.WriteString("\n")
	}

	// Generate messages
	for i, msg := range messages {
		if err := writeTSMessage(&b, msg, enumNames); err != nil {
			return nil, fmt.Errorf("message %s: %w", msg.Name, err)
		}
		if i < len(messages)-1 {
			b.WriteString("\n")
		}
	}

	return []byte(b.String()), nil
}

func writeTSEnum(b *strings.Builder, enum parser.Enum) {
	fmt.Fprintf(b, "export enum %s {\n", enum.Name)
	for i, value := range enum.Values {
		fmt.Fprintf(b, "  %s = %s", value.Name, value.Value)
		if i < len(enum.Values)-1 {
			b.WriteString(",")
		}
		b.WriteString("\n")
	}
	b.WriteString("}\n")
}

func writeTSMessage(b *strings.Builder, msg parser.Message, enumNames map[string]struct{}) error {
	segs := segmentFields(msg.Fields)

	fmt.Fprintf(b, "export class %s {\n", msg.Name)

	// Field declarations with defaults
	for _, f := range msg.Fields {
		defaultValue := tsDefaultValue(f)
		fmt.Fprintf(b, "  %s: %s = %s;\n", toCamelCase(f.Name), tsTypeName(f, enumNames), defaultValue)
	}
	b.WriteString("\n")

	// Serialize method
	b.WriteString("  serialize(view: DataView, offset: number): number {\n")
	b.WriteString("    let pos = offset;\n")
	for i, seg := range segs {
		if seg.single != nil {
			if err := writeTSSerializeField(b, "this", *seg.single, "    ", enumNames); err != nil {
				return err
			}
		} else {
			writeTSBoolGroupSerialize(b, "this", seg.bools, i, "    ")
		}
	}
	b.WriteString("    return pos - offset;\n")
	b.WriteString("  }\n\n")

	// Deserialize method
	fmt.Fprintf(b, "  static deserialize(view: DataView, offset: number): [%s, number] {\n", msg.Name)
	b.WriteString("    let pos = offset;\n")
	fmt.Fprintf(b, "    const msg = new %s();\n", msg.Name)
	for i, seg := range segs {
		if seg.single != nil {
			if err := writeTSDeserializeField(b, "msg", *seg.single, "    ", enumNames); err != nil {
				return err
			}
		} else {
			writeTSBoolGroupDeserialize(b, "msg", seg.bools, i, "    ")
		}
	}
	b.WriteString("    return [msg, pos - offset];\n")
	b.WriteString("  }\n")

	b.WriteString("}\n")
	return nil
}

func writeTSBoolGroupSerialize(b *strings.Builder, recv string, bools []parser.Field, groupIdx int, indent string) {
	varName := fmt.Sprintf("_boolByte%d", groupIdx)
	fmt.Fprintf(b, "%slet %s = 0;\n", indent, varName)
	for bit, f := range bools {
		fmt.Fprintf(b, "%sif (%s.%s) %s |= 1 << %d;\n", indent, recv, toCamelCase(f.Name), varName, bit)
	}
	fmt.Fprintf(b, "%sview.setUint8(pos, %s);\n", indent, varName)
	fmt.Fprintf(b, "%spos += 1;\n", indent)
}

func writeTSBoolGroupDeserialize(b *strings.Builder, recv string, bools []parser.Field, groupIdx int, indent string) {
	varName := fmt.Sprintf("_boolByte%d", groupIdx)
	fmt.Fprintf(b, "%sconst %s = view.getUint8(pos);\n", indent, varName)
	fmt.Fprintf(b, "%spos += 1;\n", indent)
	for bit, f := range bools {
		fmt.Fprintf(b, "%s%s.%s = (%s & (1 << %d)) !== 0;\n", indent, recv, toCamelCase(f.Name), varName, bit)
	}
}

func writeTSSerializeField(b *strings.Builder, recv string, f parser.Field, indent string, enumNames map[string]struct{}) error {
	access := recv + "." + toCamelCase(f.Name)
	switch f.Kind {
	case parser.KindPrimitive:
		return writeTSSerializePrimitive(b, access, f, indent, enumNames)
	case parser.KindNested:
		fmt.Fprintf(b, "%spos += %s.serialize(view, pos);\n", indent, access)
	case parser.KindFixedArray:
		iVar := "_i" + f.Name
		fmt.Fprintf(b, "%sfor (let %s = 0; %s < %d; %s++) {\n",
			indent, iVar, iVar, f.FixedLen, iVar)
		elemField := parser.Field{
			Name:      f.Name + "[" + iVar + "]",
			Kind:      f.Elem.Kind,
			Primitive: f.Elem.Primitive,
			NamedType: f.Elem.NamedType,
			Quant:     f.Elem.Quant,
			TypeName:  f.Elem.TypeName,
			Elem:      f.Elem.Elem,
			FixedLen:  f.Elem.FixedLen,
		}
		if err := writeTSSerializeField(b, recv, elemField, indent+"  ", enumNames); err != nil {
			return err
		}
		fmt.Fprintf(b, "%s}\n", indent)
	case parser.KindSlice:
		fmt.Fprintf(b, "%sview.setUint16(pos, %s.length, true);\n", indent, access)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
		iVar := "_i" + f.Name
		fmt.Fprintf(b, "%sfor (const %s of %s) {\n", indent, iVar, access)
		elemField := parser.Field{
			Name:      iVar,
			Kind:      f.Elem.Kind,
			Primitive: f.Elem.Primitive,
			NamedType: f.Elem.NamedType,
			Quant:     f.Elem.Quant,
			TypeName:  f.Elem.TypeName,
			Elem:      f.Elem.Elem,
			FixedLen:  f.Elem.FixedLen,
		}
		if err := writeTSSerializeFieldElement(b, iVar, elemField, indent+"  ", enumNames); err != nil {
			return err
		}
		fmt.Fprintf(b, "%s}\n", indent)
	}
	return nil
}

func writeTSSerializeFieldElement(b *strings.Builder, access string, f parser.Field, indent string, enumNames map[string]struct{}) error {
	switch f.Kind {
	case parser.KindPrimitive:
		return writeTSSerializePrimitiveElement(b, access, f, indent, enumNames)
	case parser.KindNested:
		fmt.Fprintf(b, "%spos += %s.serialize(view, pos);\n", indent, access)
	}
	return nil
}

func writeTSSerializePrimitiveElement(b *strings.Builder, access string, f parser.Field, indent string, enumNames map[string]struct{}) error {
	if f.Quant != nil {
		return writeTSSerializeQuantElement(b, access, f, indent)
	}

	valueExpr := tsSerializeValueExpr(access, f, enumNames)
	switch f.Primitive {
	case parser.KindFloat32:
		fmt.Fprintf(b, "%sview.setFloat32(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindFloat64:
		fmt.Fprintf(b, "%sview.setFloat64(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindInt8:
		fmt.Fprintf(b, "%sview.setInt8(pos, %s);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindUint8:
		fmt.Fprintf(b, "%sview.setUint8(pos, %s);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindBool:
		fmt.Fprintf(b, "%sview.setUint8(pos, %s ? 1 : 0);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindInt16:
		fmt.Fprintf(b, "%sview.setInt16(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	case parser.KindUint16:
		fmt.Fprintf(b, "%sview.setUint16(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	case parser.KindInt32:
		fmt.Fprintf(b, "%sview.setInt32(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindUint32:
		fmt.Fprintf(b, "%sview.setUint32(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindInt64:
		fmt.Fprintf(b, "%sview.setBigInt64(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindUint64:
		fmt.Fprintf(b, "%sview.setBigUint64(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindString:
		lenVar := "_slen" + sanitizeVarName(access)
		fmt.Fprintf(b, "%sconst %s = new TextEncoder().encode(%s);\n", indent, lenVar, valueExpr)
		fmt.Fprintf(b, "%sview.setUint16(pos, %s.length, true);\n", indent, lenVar)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
		fmt.Fprintf(b, "%snew Uint8Array(view.buffer, pos, %s.length).set(%s);\n", indent, lenVar, lenVar)
		fmt.Fprintf(b, "%spos += %s.length;\n", indent, lenVar)
	}
	return nil
}

func writeTSSerializePrimitive(b *strings.Builder, access string, f parser.Field, indent string, enumNames map[string]struct{}) error {
	if f.Quant != nil {
		return writeTSSerializeQuant(b, access, f, indent)
	}

	valueExpr := tsSerializeValueExpr(access, f, enumNames)
	switch f.Primitive {
	case parser.KindFloat32:
		fmt.Fprintf(b, "%sview.setFloat32(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindFloat64:
		fmt.Fprintf(b, "%sview.setFloat64(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindInt8:
		fmt.Fprintf(b, "%sview.setInt8(pos, %s);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindUint8:
		fmt.Fprintf(b, "%sview.setUint8(pos, %s);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindBool:
		fmt.Fprintf(b, "%sview.setUint8(pos, %s ? 1 : 0);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindInt16:
		fmt.Fprintf(b, "%sview.setInt16(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	case parser.KindUint16:
		fmt.Fprintf(b, "%sview.setUint16(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	case parser.KindInt32:
		fmt.Fprintf(b, "%sview.setInt32(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindUint32:
		fmt.Fprintf(b, "%sview.setUint32(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindInt64:
		fmt.Fprintf(b, "%sview.setBigInt64(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindUint64:
		fmt.Fprintf(b, "%sview.setBigUint64(pos, %s, true);\n", indent, valueExpr)
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindString:
		lenVar := "_slen" + sanitizeVarName(access)
		fmt.Fprintf(b, "%sconst %s = new TextEncoder().encode(%s);\n", indent, lenVar, valueExpr)
		fmt.Fprintf(b, "%sview.setUint16(pos, %s.length, true);\n", indent, lenVar)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
		fmt.Fprintf(b, "%snew Uint8Array(view.buffer, pos, %s.length).set(%s);\n", indent, lenVar, lenVar)
		fmt.Fprintf(b, "%spos += %s.length;\n", indent, lenVar)
	}
	return nil
}

func writeTSSerializeQuant(b *strings.Builder, access string, f parser.Field, indent string) error {
	q := f.Quant
	maxUint := q.MaxUint()
	varName := "_q" + sanitizeVarName(access)
	if q.Bits == 8 {
		fmt.Fprintf(b, "%sconst %s = Math.round((%s - (%g)) / (%g - (%g)) * %g);\n",
			indent, varName, access, q.Min, q.Max, q.Min, maxUint)
		fmt.Fprintf(b, "%sview.setUint8(pos, %s);\n", indent, varName)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	} else {
		fmt.Fprintf(b, "%sconst %s = Math.round((%s - (%g)) / (%g - (%g)) * %g);\n",
			indent, varName, access, q.Min, q.Max, q.Min, maxUint)
		fmt.Fprintf(b, "%sview.setUint16(pos, %s, true);\n", indent, varName)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	}
	return nil
}

func writeTSSerializeQuantElement(b *strings.Builder, access string, f parser.Field, indent string) error {
	q := f.Quant
	maxUint := q.MaxUint()
	varName := "_q" + sanitizeVarName(access)
	if q.Bits == 8 {
		fmt.Fprintf(b, "%sconst %s = Math.round((%s - (%g)) / (%g - (%g)) * %g);\n",
			indent, varName, access, q.Min, q.Max, q.Min, maxUint)
		fmt.Fprintf(b, "%sview.setUint8(pos, %s);\n", indent, varName)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	} else {
		fmt.Fprintf(b, "%sconst %s = Math.round((%s - (%g)) / (%g - (%g)) * %g);\n",
			indent, varName, access, q.Min, q.Max, q.Min, maxUint)
		fmt.Fprintf(b, "%sview.setUint16(pos, %s, true);\n", indent, varName)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	}
	return nil
}

func writeTSDeserializeField(b *strings.Builder, recv string, f parser.Field, indent string, enumNames map[string]struct{}) error {
	access := recv + "." + toCamelCase(f.Name)
	switch f.Kind {
	case parser.KindPrimitive:
		return writeTSDeserializePrimitive(b, access, f, indent, enumNames)
	case parser.KindNested:
		fmt.Fprintf(b, "%sconst [_%s, _n%s] = %s.deserialize(view, pos);\n", indent, f.Name, f.Name, f.TypeName)
		fmt.Fprintf(b, "%s%s = _%s;\n", indent, access, f.Name)
		fmt.Fprintf(b, "%spos += _n%s;\n", indent, f.Name)
	case parser.KindFixedArray:
		iVar := "_i" + f.Name
		fmt.Fprintf(b, "%s%s = new Array(%d);\n", indent, access, f.FixedLen)
		fmt.Fprintf(b, "%sfor (let %s = 0; %s < %d; %s++) {\n",
			indent, iVar, iVar, f.FixedLen, iVar)
		elemField := parser.Field{
			Name:      f.Name + "[" + iVar + "]",
			Kind:      f.Elem.Kind,
			Primitive: f.Elem.Primitive,
			NamedType: f.Elem.NamedType,
			Quant:     f.Elem.Quant,
			TypeName:  f.Elem.TypeName,
			Elem:      f.Elem.Elem,
			FixedLen:  f.Elem.FixedLen,
		}
		if err := writeTSDeserializeField(b, recv, elemField, indent+"  ", enumNames); err != nil {
			return err
		}
		fmt.Fprintf(b, "%s}\n", indent)
	case parser.KindSlice:
		lenVar := "_len" + f.Name
		fmt.Fprintf(b, "%sconst %s = view.getUint16(pos, true);\n", indent, lenVar)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
		fmt.Fprintf(b, "%s%s = new Array(%s);\n", indent, access, lenVar)
		iVar := "_i" + f.Name
		fmt.Fprintf(b, "%sfor (let %s = 0; %s < %s; %s++) {\n", indent, iVar, iVar, lenVar, iVar)
		elemField := parser.Field{
			Name:      f.Name + "[" + iVar + "]",
			Kind:      f.Elem.Kind,
			Primitive: f.Elem.Primitive,
			NamedType: f.Elem.NamedType,
			Quant:     f.Elem.Quant,
			TypeName:  f.Elem.TypeName,
			Elem:      f.Elem.Elem,
			FixedLen:  f.Elem.FixedLen,
		}
		if err := writeTSDeserializeFieldElement(b, recv, elemField, indent+"  ", enumNames); err != nil {
			return err
		}
		fmt.Fprintf(b, "%s}\n", indent)
	}
	return nil
}

func writeTSDeserializeFieldElement(b *strings.Builder, recv string, f parser.Field, indent string, enumNames map[string]struct{}) error {
	access := recv + "." + toCamelCase(f.Name)
	switch f.Kind {
	case parser.KindPrimitive:
		return writeTSDeserializePrimitiveElement(b, access, f, indent, enumNames)
	case parser.KindNested:
		fmt.Fprintf(b, "%sconst [_elem, _nElem] = %s.deserialize(view, pos);\n", indent, f.TypeName)
		fmt.Fprintf(b, "%s%s = _elem;\n", indent, access)
		fmt.Fprintf(b, "%spos += _nElem;\n", indent)
	}
	return nil
}

func writeTSDeserializePrimitiveElement(b *strings.Builder, access string, f parser.Field, indent string, enumNames map[string]struct{}) error {
	if f.Quant != nil {
		return writeTSDeserializeQuantElement(b, access, f, indent)
	}

	switch f.Primitive {
	case parser.KindFloat32:
		expr := "view.getFloat32(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindFloat64:
		expr := "view.getFloat64(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindInt8:
		expr := "view.getInt8(pos)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindUint8:
		expr := "view.getUint8(pos)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindBool:
		expr := "view.getUint8(pos) !== 0"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindInt16:
		expr := "view.getInt16(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	case parser.KindUint16:
		expr := "view.getUint16(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	case parser.KindInt32:
		expr := "view.getInt32(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindUint32:
		expr := "view.getUint32(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindInt64:
		expr := "view.getBigInt64(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindUint64:
		expr := "view.getBigUint64(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindString:
		lenVar := "_slen" + sanitizeVarName(access)
		fmt.Fprintf(b, "%sconst %s = view.getUint16(pos, true);\n", indent, lenVar)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
		expr := fmt.Sprintf("new TextDecoder().decode(new Uint8Array(view.buffer, pos, %s))", lenVar)
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += %s;\n", indent, lenVar)
	}
	return nil
}

func writeTSDeserializePrimitive(b *strings.Builder, access string, f parser.Field, indent string, enumNames map[string]struct{}) error {
	if f.Quant != nil {
		return writeTSDeserializeQuant(b, access, f, indent)
	}

	switch f.Primitive {
	case parser.KindFloat32:
		expr := "view.getFloat32(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindFloat64:
		expr := "view.getFloat64(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindInt8:
		expr := "view.getInt8(pos)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindUint8:
		expr := "view.getUint8(pos)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindBool:
		expr := "view.getUint8(pos) !== 0"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 1;\n", indent)
	case parser.KindInt16:
		expr := "view.getInt16(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	case parser.KindUint16:
		expr := "view.getUint16(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 2;\n", indent)
	case parser.KindInt32:
		expr := "view.getInt32(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindUint32:
		expr := "view.getUint32(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 4;\n", indent)
	case parser.KindInt64:
		expr := "view.getBigInt64(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindUint64:
		expr := "view.getBigUint64(pos, true)"
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += 8;\n", indent)
	case parser.KindString:
		lenVar := "_slen" + sanitizeVarName(access)
		fmt.Fprintf(b, "%sconst %s = view.getUint16(pos, true);\n", indent, lenVar)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
		expr := fmt.Sprintf("new TextDecoder().decode(new Uint8Array(view.buffer, pos, %s))", lenVar)
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, enumNames))
		fmt.Fprintf(b, "%spos += %s;\n", indent, lenVar)
	}
	return nil
}

func writeTSDeserializeQuant(b *strings.Builder, access string, f parser.Field, indent string) error {
	q := f.Quant
	maxUint := q.MaxUint()
	varName := "_q" + sanitizeVarName(access)
	if q.Bits == 8 {
		fmt.Fprintf(b, "%sconst %s = view.getUint8(pos);\n", indent, varName)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
		expr := fmt.Sprintf("%s / %g * (%g - (%g)) + (%g)", varName, maxUint, q.Max, q.Min, q.Min)
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, nil))
	} else {
		fmt.Fprintf(b, "%sconst %s = view.getUint16(pos, true);\n", indent, varName)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
		expr := fmt.Sprintf("%s / %g * (%g - (%g)) + (%g)", varName, maxUint, q.Max, q.Min, q.Min)
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, nil))
	}
	return nil
}

func writeTSDeserializeQuantElement(b *strings.Builder, access string, f parser.Field, indent string) error {
	q := f.Quant
	maxUint := q.MaxUint()
	varName := "_q" + sanitizeVarName(access)
	if q.Bits == 8 {
		fmt.Fprintf(b, "%sconst %s = view.getUint8(pos);\n", indent, varName)
		fmt.Fprintf(b, "%spos += 1;\n", indent)
		expr := fmt.Sprintf("%s / %g * (%g - (%g)) + (%g)", varName, maxUint, q.Max, q.Min, q.Min)
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, nil))
	} else {
		fmt.Fprintf(b, "%sconst %s = view.getUint16(pos, true);\n", indent, varName)
		fmt.Fprintf(b, "%spos += 2;\n", indent)
		expr := fmt.Sprintf("%s / %g * (%g - (%g)) + (%g)", varName, maxUint, q.Max, q.Min, q.Min)
		fmt.Fprintf(b, "%s%s = %s;\n", indent, access, tsDeserializeValueExpr(expr, f, nil))
	}
	return nil
}

func tsTypeName(f parser.Field, enumNames map[string]struct{}) string {
	switch f.Kind {
	case parser.KindPrimitive:
		if tsIsEnumType(f, enumNames) {
			return f.NamedType
		}
		return tsPrimitiveTypeName(f.Primitive)
	case parser.KindNested:
		return f.TypeName
	case parser.KindFixedArray, parser.KindSlice:
		return tsTypeName(*f.Elem, enumNames) + "[]"
	}
	return "unknown"
}

func tsPrimitiveTypeName(k parser.PrimitiveKind) string {
	switch k {
	case parser.KindFloat32, parser.KindFloat64:
		return "number"
	case parser.KindInt8, parser.KindInt16, parser.KindInt32, parser.KindUint8, parser.KindUint16, parser.KindUint32:
		return "number"
	case parser.KindInt64, parser.KindUint64:
		return "bigint"
	case parser.KindBool:
		return "boolean"
	case parser.KindString:
		return "string"
	}
	return "unknown"
}

func tsDefaultValue(f parser.Field) string {
	switch f.Kind {
	case parser.KindPrimitive:
		if tsIsEnumType(f, nil) {
			return "0"
		}
		switch f.Primitive {
		case parser.KindFloat32, parser.KindFloat64, parser.KindInt8, parser.KindInt16, parser.KindInt32,
			parser.KindUint8, parser.KindUint16, parser.KindUint32:
			return "0"
		case parser.KindInt64, parser.KindUint64:
			return "0n"
		case parser.KindBool:
			return "false"
		case parser.KindString:
			return `""`
		}
	case parser.KindNested:
		return fmt.Sprintf("new %s()", f.TypeName)
	case parser.KindFixedArray:
		elemDefault := tsDefaultValue(*f.Elem)
		elemType := tsTypeName(*f.Elem, nil)
		return fmt.Sprintf("new Array<%s>(%d).fill(%s)", elemType, f.FixedLen, elemDefault)
	case parser.KindSlice:
		return "[]"
	}
	return "undefined"
}

func tsSerializeValueExpr(access string, f parser.Field, enumNames map[string]struct{}) string {
	if !tsIsEnumType(f, enumNames) {
		return access
	}
	return access + " as " + tsPrimitiveTypeName(f.Primitive)
}

func tsDeserializeValueExpr(expr string, f parser.Field, enumNames map[string]struct{}) string {
	if !tsIsEnumType(f, enumNames) {
		return expr
	}
	return "(" + expr + " as " + f.NamedType + ")"
}

func tsIsEnumType(f parser.Field, enumNames map[string]struct{}) bool {
	if f.NamedType == "" || enumNames == nil {
		return false
	}
	_, ok := enumNames[f.NamedType]
	return ok
}

// toCamelCase converts PascalCase to camelCase (e.g., EntityID -> entityID)
func toCamelCase(s string) string {
	if s == "" {
		return ""
	}
	// First character to lowercase
	result := strings.ToLower(s[:1]) + s[1:]
	return result
}