package controllers

import (
	"context"
	"errors"
	"strings"

	"git.golem15.com/golem15/sm-journal-plugin/classes"
	"git.golem15.com/golem15/sm-journal-plugin/models"
	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/cabana"
	"git.golem15.com/golem15/summercms/modules/pact"
)

const (
	// CategoriesControllerID is the cabana controller id of the Categories screen.
	CategoriesControllerID = "golem15.journal.categories"
	// PermissionAccessCategories is Categories::$requiredPermissions.
	PermissionAccessCategories = "golem15.journal.access_categories"
)

type categoriesAdminController struct {
	app func() *backpack.App
}

func (categoriesAdminController) ID() string { return CategoriesControllerID }

func (categoriesAdminController) ModelName() string { return `Golem15\Journal\Models\Category` }

func (categoriesAdminController) ConfigDir() string { return "controllers/categories" }

func (categoriesAdminController) RequiredPermissions() []string {
	return []string{PermissionAccessCategories}
}

func (categoriesAdminController) NewRecord() any { return &models.Category{} }

func (categoriesAdminController) AdminFieldRelations() []cabana.FieldRelationContract {
	return []cabana.FieldRelationContract{{
		Field:       "parent",
		Kind:        "belongsTo",
		NewRelated:  func() any { return &models.Category{} },
		ForeignKey:  "parent_id",
		LabelColumn: "name",
	}}
}

func (categoriesAdminController) FormBeforeCreate(ctx context.Context, model any) error {
	cat, ok := model.(*models.Category)
	if !ok || cat == nil {
		return errors.New("categories admin: form model is not a category")
	}
	return prepareCategoryWrite(cat)
}

func (categoriesAdminController) FormBeforeUpdate(ctx context.Context, model any) error {
	cat, ok := model.(*models.Category)
	if !ok || cat == nil {
		return errors.New("categories admin: form model is not a category")
	}
	return prepareCategoryWrite(cat)
}

// prepareCategoryWrite gates the category HTML body (D-21): blank content is
// stored as NULL, and content that fails classes.CheckHTML is a 422 on
// content. Any other content is stored exactly as submitted.
func prepareCategoryWrite(cat *models.Category) error {
	if cat.Content == nil {
		return nil
	}
	if strings.TrimSpace(*cat.Content) == "" {
		cat.Content = nil
		return nil
	}
	if err := classes.CheckHTML(*cat.Content); err != nil {
		return &cabana.ValidationError{Details: map[string]any{
			"content": []string{err.Error()},
		}}
	}
	return nil
}

var (
	_ pact.AdminController         = categoriesAdminController{}
	_ pact.AdminPermissioned       = categoriesAdminController{}
	_ pact.AdminRecordSource       = categoriesAdminController{}
	_ pact.FormBeforeCreate        = categoriesAdminController{}
	_ pact.FormBeforeUpdate        = categoriesAdminController{}
	_ cabana.FieldRelationProvider = categoriesAdminController{}
)