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

package config

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"gopkg.in/yaml.v3"
	"log/slog"
	"decl/internal/codec"
)

type BlockType struct {
	Name string `json:"name" yaml:"name"`
	Type TypeName `json:"type" yaml:"type"`
}

type Block struct {
	Name string `json:"name" yaml:"name"`
	Type TypeName `json:"type" yaml:"type"`
	Values Configuration `json:"values" yaml:"values"`
}

func NewBlock() *Block {
	return &Block{ Type: "generic" }
}

func (b *Block) Clone() *Block {
	return &Block {
		Type: b.Type,
		Values: b.Values.Clone(),
	}
}

func (b *Block) Load(r io.Reader) error {
	return codec.NewYAMLDecoder(r).Decode(b)
}

func (b *Block) LoadBlock(yamlBlock string) (err error) {
	err = codec.NewYAMLStringDecoder(yamlBlock).Decode(b)
	slog.Info("LoadBlock()", "yaml", yamlBlock, "object", b, "err", err)
	return
}

func (b *Block) NewConfiguration() error {
	uri := fmt.Sprintf("%s://", b.Type)
	newConfig, err := ConfigTypes.New(uri)
	b.Values = newConfig
	return err
}

func (b *Block) GetValue(key string) (any, error) {
	return b.Values.GetValue(key)
}

func (b *Block) Configuration() Configuration {
	return b.Values
}

func (b *Block) SetURI(uri string) (e error) {
	b.Values = NewConfiguration(uri)
	if b.Values == nil {
		return ErrUnknownConfigurationType
	}
	b.Type = TypeName(b.Values.Type())
	_,e = b.Values.Read(context.Background())
	return e
}


func (b *Block) UnmarshalValue(value *BlockType) error {
	b.Name = value.Name
	if value.Type == "" {
		b.Type = "generic"
	} else {
		b.Type = value.Type
	}

	newConfig, configErr := ConfigTypes.New(fmt.Sprintf("%s://", b.Type))
	if configErr != nil {
		return configErr
	}
	b.Values = newConfig
	return nil
}

func (b *Block) UnmarshalYAML(value *yaml.Node) error {
	t := &BlockType{}
	if unmarshalConfigurationTypeErr := value.Decode(t); unmarshalConfigurationTypeErr != nil {
		return unmarshalConfigurationTypeErr
	}

	if err := b.UnmarshalValue(t); err != nil {
		return err
	}

	configurationVals := struct {
		Values yaml.Node `json:"values"`
	}{}
	if unmarshalValuesErr := value.Decode(&configurationVals); unmarshalValuesErr != nil {
		return unmarshalValuesErr
	}
	if unmarshalConfigurationErr := configurationVals.Values.Decode(b.Values); unmarshalConfigurationErr != nil {
		return unmarshalConfigurationErr
	}
	_, readErr := b.Values.Read(context.Background())
	return readErr
}

func (b *Block) UnmarshalJSON(data []byte) error {
	t := &BlockType{}
	if unmarshalConfigurationTypeErr := json.Unmarshal(data, t); unmarshalConfigurationTypeErr != nil {
		return unmarshalConfigurationTypeErr
	}

	if err := b.UnmarshalValue(t); err != nil {
		return err
	}

	configurationVals := struct {
		Values Configuration `json:"values"`
	}{Values: b.Values}
	if unmarshalValuesErr := json.Unmarshal(data, &configurationVals); unmarshalValuesErr != nil {
		return unmarshalValuesErr
	}
	_, readErr := b.Values.Read(context.Background())
	return readErr
}

func (b *Block) MarshalYAML() (any, error) {
	return b, nil
}