// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.

package resource

import (
	"encoding/json"
	"errors"
	_ "fmt"
	"github.com/xeipuuv/gojsonschema"
	"gopkg.in/yaml.v3"
	"io"
	_ "log"
	_ "net/url"
	"strings"
)

type Document struct {
	ResourceDecls []Declaration `json:"resources" yaml:"resources"`
}

func NewDocument() *Document {
	return &Document{}
}

func (d *Document) Load(r io.Reader) error {
	yamlDecoder := yaml.NewDecoder(r)
	if e := yamlDecoder.Decode(d); e != nil {
		return e
	}
	return nil
}

func (d *Document) Validate() error {
	jsonDocument, jsonErr := d.JSON()
	if jsonErr == nil {
		schemaLoader := gojsonschema.NewReferenceLoader("file://schemas/document.jsonschema")
		documentLoader := gojsonschema.NewBytesLoader(jsonDocument)
		result, err := gojsonschema.Validate(schemaLoader, documentLoader)
		if err != nil {
			return err
		}

		if !result.Valid() {
			schemaErrors := strings.Builder{}
			for _, err := range result.Errors() {
				schemaErrors.WriteString(err.String() + "\n")
			}
			return errors.New(schemaErrors.String())
		}
	}
	return nil
}

func (d *Document) Resources() []Declaration {
	return d.ResourceDecls
}

func (d *Document) Apply() error {
	for i := range d.ResourceDecls {
		if e := d.ResourceDecls[i].Resource().Apply(); e != nil {
			return e
		}
	}
	return nil
}

func (d *Document) Generate(w io.Writer) error {
	e := NewYAMLEncoder(w)
	err := e.Encode(d);
	if err == nil {
		return e.Close()
	}
	e.Close()
	return err
}

func (d *Document) AddResourceDeclaration(resourceType string, resourceDeclaration Resource) {
	decl := NewDeclaration()
	decl.Type = TypeName(resourceType)
	decl.Attributes = resourceDeclaration
	d.ResourceDecls = append(d.ResourceDecls, *decl)
}

func (d *Document) AddResource(uri string) error {
	//parsedResourceURI, e := url.Parse(uri)
	//if e == nil {
	decl := NewDeclaration()
	if e := decl.SetURI(uri); e != nil {
		return e
	}
	
	d.ResourceDecls = append(d.ResourceDecls, *decl)
	//}
	return nil
}

func (d *Document) JSON() ([]byte, error) {
	return json.Marshal(d)
}

func (d *Document) YAML() ([]byte, error) {
	return yaml.Marshal(d)
}