// helpers — конвертация имён, форматирование, plan-модификаторы.
package main

import (
	"fmt"
	"go/format"
	"os"
	"strings"
	"unicode"
)

func toCamel(s string) string {
	parts := strings.FieldsFunc(s, func(r rune) bool { return r == '_' || r == '-' })
	for i, p := range parts {
		if len(p) == 0 {
			continue
		}
		parts[i] = strings.ToUpper(p[:1]) + p[1:]
	}
	out := strings.Join(parts, "")
	return ensureGoIdent(out)
}

func toSnake(s string) string {
	var out []rune
	for i, r := range s {
		if i > 0 && r >= 'A' && r <= 'Z' {
			out = append(out, '_')
		}
		out = append(out, rune(strings.ToLower(string(r))[0]))
	}
	return string(out)
}

func paramType(p Param) string {
	switch strings.ToLower(p.Type) {
	case "bool":
		return "types.Bool"
	case "int", "int64", "number":
		return "types.Int64"
	default:
		return "types.String"
	}
}

func paramDefaultExpr(p Param) string {
	if p.Default == "" {
		return ""
	}
	switch strings.ToLower(p.Type) {
	case "bool":
		val := strings.ToLower(p.Default)
		return fmt.Sprintf("booldefault.StaticBool(%s)", val)
	case "int", "int64", "number":
		return fmt.Sprintf("int64default.StaticInt64(%s)", p.Default)
	default:
		return fmt.Sprintf("stringdefault.StaticString(%q)", p.Default)
	}
}

func paramFormat(p Param, varName string) string {
	switch strings.ToLower(p.Type) {
	case "bool":
		return fmt.Sprintf("resources_core.FormatBool(%s)", varName)
	case "int", "int64", "number":
		return fmt.Sprintf("resources_core.FormatInt64(%s)", varName)
	default:
		return fmt.Sprintf("resources_core.FormatString(%s)", varName)
	}
}

func paramParse(p Param) string {
	switch strings.ToLower(p.Type) {
	case "bool":
		return "resources_core.ParseBool"
	case "int", "int64", "number":
		return "resources_core.ParseInt64"
	default:
		return "resources_core.ParseString"
	}
}

func paramDescription(p Param) string {
	var desc string
	if strings.TrimSpace(p.Descr) != "" {
		desc = strings.TrimSpace(p.Descr)
	} else if strings.TrimSpace(p.Man) != "" {
		desc = strings.TrimSpace(p.Man)
	} else if p.RefSvcId > 0 {
		desc = fmt.Sprintf("UI display_name for service_id=%d (mapped to UUID in core)", p.RefSvcId)
	}
	if p.CreateOnly {
		if desc == "" {
			desc = "Не изменяется после создания."
		} else {
			desc = desc + " Не изменяется после создания."
		}
	}
	if p.ForceNew {
		if desc == "" {
			desc = "Изменение требует пересоздания."
		} else {
			desc = desc + " Изменение требует пересоздания."
		}
	}
	if desc == "" {
		return ""
	}
	return fmt.Sprintf("%q", desc)
}

func outputParamType(p OutputParam) string {
	switch strings.ToLower(p.Type) {
	case "map":
		return "types.Map"
	case "list":
		return "types.List"
	default:
		return "types.String"
	}
}

func outputParamIsMap(p OutputParam) bool {
	return strings.EqualFold(strings.TrimSpace(p.Type), "map")
}

func outputParamIsList(p OutputParam) bool {
	return strings.EqualFold(strings.TrimSpace(p.Type), "list")
}

func outputParamSensitive(p OutputParam) bool {
	return p.Sensitive
}

func ensureGoIdent(s string) string {
	if s == "" {
		return "R"
	}
	first := rune(s[0])
	if unicode.IsLetter(first) || first == '_' {
		return s
	}
	return "R" + s
}


func formatSourceOrWarn(filePath string, src []byte) []byte {
	formatted, err := format.Source(src)
	if err != nil {
		fmt.Fprintf(os.Stderr, "WARNING: gofmt failed for %s: %v — writing unformatted code\n", filePath, err)
		return src
	}
	return formatted
}

func planModifierType(p Param) string {
	switch strings.ToLower(strings.TrimSpace(p.Type)) {
	case "bool":
		return "Bool"
	case "int", "int64", "number":
		return "Int64"
	default:
		return "String"
	}
}

func planModifierExpr(p Param) string {
	switch strings.ToLower(strings.TrimSpace(p.Type)) {
	case "bool":
		return "boolplanmodifier.RequiresReplace()"
	case "int", "int64", "number":
		return "int64planmodifier.RequiresReplace()"
	default:
		return "stringplanmodifier.RequiresReplace()"
	}
}