// Package writers — генерация Go-файлов ресурсов и registry.go.
//
// Генерирует три типа файлов в internal/resources_gen/:
//   - {id}_{service}_resource.go  — основной CRUD инстанса
//   - {id}_{service}_{sub}_resource.go — подресурсы
//   - {id}_{service}_{action}_action.go — action-ресурсы (редко)
//   - registry.go — AllResources() со списком всех ресурсов
//
// Каждый файл компилируется через text/template и форматируется через gofmt.
package writers

import (
	"bytes"
	"fmt"
	"os"
	"path/filepath"
	"text/template"

	"resource-generator/internal/helpers"
	"resource-generator/internal/templates"
	"resource-generator/internal/types"
)

// WriteInstanceResource генерирует nubes_{service} (CRUD инстанса).
func WriteInstanceResource(outDir string, svc types.GenResource) error {
	fileName := fmt.Sprintf("%d_%s_resource.go", svc.ServiceID, svc.Name)
	filePath := filepath.Join(outDir, fileName)

	tpl, err := template.New("resource").Funcs(template.FuncMap{
		"ToCamel":           helpers.ToCamel,
		"ToSnake":           helpers.ToSnake,
		"ParamType":         helpers.ParamType,
		"ParamDefaultExpr":  helpers.ParamDefaultExpr,
		"ParamFormat":       helpers.ParamFormat,
		"ParamParse":        helpers.ParamParse,
		"ParamDescription":  helpers.ParamDescription,
		"OutputType":        helpers.OutputParamType,
		"OutputIsMap":       helpers.OutputParamIsMap,
		"OutputIsList":      helpers.OutputParamIsList,
		"OutputSensitive":   helpers.OutputParamSensitive,
		"IsNested":          helpers.IsNested,
		"IsNestedList":      helpers.IsNestedList,
		"NestedModelName":   helpers.NestedModelName,
		"NestedTfType":      helpers.NestedTfType,
		"NestedSchemaType":  helpers.NestedSchemaType,
		"NestedSchemaBlock": helpers.NestedSchemaBlock,
		"NestedSchemaEnd":   helpers.NestedSchemaEnd,
		"NestedJSONExpr":    helpers.NestedJSONExpr,
		"SubSchemaType":     helpers.SubSchemaType,
		"SubDefaultExpr":    helpers.SubDefaultExpr,
		"bt":                func() string { return "`" },
	}).Parse(templates.Instance)
	if err != nil {
		return err
	}

	var buf bytes.Buffer
	if err := tpl.Execute(&buf, svc); err != nil {
		return err
	}

	formatted := helpers.FormatSourceOrWarn(filePath, buf.Bytes())

	return os.WriteFile(filePath, formatted, 0644)
}

// WriteSubresource генерирует nubes_{service}_{sub} (пользователи, базы, ...).
func WriteSubresource(outDir string, sr types.GenSubresource) error {
	name := fmt.Sprintf("%s_%s", sr.ServiceName, sr.SubName)
	fileName := fmt.Sprintf("%d_%s_resource.go", sr.ServiceID, name)
	filePath := filepath.Join(outDir, fileName)

	tpl, err := template.New("subresource").Funcs(template.FuncMap{
		"ToCamel":          helpers.ToCamel,
		"ToSnake":          helpers.ToSnake,
		"ParamType":        helpers.ParamType,
		"ParamDefaultExpr": helpers.ParamDefaultExpr,
		"ParamFormat":      helpers.ParamFormat,
		"ParamParse":       helpers.ParamParse,
		"ParamDescription": helpers.ParamDescription,
		"PlanModifierType": helpers.PlanModifierType,
		"PlanModifierExpr": helpers.PlanModifierExpr,
		"bt":               func() string { return "`" },
	}).Parse(templates.Subresource)
	if err != nil {
		return err
	}

	var buf bytes.Buffer
	if err := tpl.Execute(&buf, sr); err != nil {
		return err
	}

	formatted := helpers.FormatSourceOrWarn(filePath, buf.Bytes())

	return os.WriteFile(filePath, formatted, 0644)
}

// WriteActionResource генерирует action-ресурс (почти не используется).
func WriteActionResource(outDir string, act types.GenAction) error {
	name := fmt.Sprintf("%s_%s", act.ServiceName, act.ActionName)
	fileName := fmt.Sprintf("%d_%s_action.go", act.ServiceID, name)
	filePath := filepath.Join(outDir, fileName)

	tpl, err := template.New("action").Funcs(template.FuncMap{
		"ToCamel":          helpers.ToCamel,
		"ToSnake":          helpers.ToSnake,
		"ParamType":        helpers.ParamType,
		"ParamDefaultExpr": helpers.ParamDefaultExpr,
		"ParamFormat":      helpers.ParamFormat,
		"ParamParse":       helpers.ParamParse,
		"ParamDescription": helpers.ParamDescription,
		"bt":               func() string { return "`" },
	}).Parse(templates.Action)
	if err != nil {
		return err
	}

	var buf bytes.Buffer
	if err := tpl.Execute(&buf, act); err != nil {
		return err
	}

	formatted := helpers.FormatSourceOrWarn(filePath, buf.Bytes())

	return os.WriteFile(filePath, formatted, 0644)
}

// WriteRegistry генерирует registry.go со списком всех ресурсов.
func WriteRegistry(outDir string, services []types.GenResource, subs []types.GenSubresource, actions []types.GenAction) error {
	var buf bytes.Buffer
	buf.WriteString("package resources_gen\n\n")
	buf.WriteString("import \"github.com/hashicorp/terraform-plugin-framework/resource\"\n\n")
	buf.WriteString("// Code generated by tools/gen_v2. DO NOT EDIT.\n")
	buf.WriteString("func AllResources() []func() resource.Resource {\n")
	buf.WriteString("\treturn []func() resource.Resource{\n")
	for _, svc := range services {
		buf.WriteString(fmt.Sprintf("\t\tNew%[1]sResource,\n", helpers.ToCamel(svc.Name)))
	}
	for _, sr := range subs {
		buf.WriteString(fmt.Sprintf("\t\tNew%[1]sResource,\n", helpers.ToCamel(sr.ServiceName+"_"+sr.SubName)))
	}
	for _, act := range actions {
		buf.WriteString(fmt.Sprintf("\t\tNew%[1]sResource,\n", helpers.ToCamel(act.ServiceName+"_"+act.ActionName)))
	}
	buf.WriteString("\t}\n")
	buf.WriteString("}\n")

	regPath := filepath.Join(outDir, "registry.go")
	formatted := helpers.FormatSourceOrWarn(regPath, buf.Bytes())

	return os.WriteFile(regPath, formatted, 0644)
}