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

package resource

import (
	"context"
	"fmt"
	"gopkg.in/yaml.v3"
	_ "log"
	"net/url"
	_ "os"
	_ "os/exec"
	"path/filepath"
_	"strings"
	"io"
	"gitea.rosskeen.house/rosskeen.house/machine"
	"decl/internal/codec"
)

type Exec struct {
	stater machine.Stater `yaml:"-" json:"-"`
	Id     string `yaml:"id" json:"id"`
	CreateTemplate Command `yaml:"create" json:"create"`
	ReadTemplate Command `yaml:"read" json:"read"`
	UpdateTemplate Command `yaml:"update" json:"update"`
	DeleteTemplate Command `yaml:"delete" json:"delete"`

	config ConfigurationValueGetter
	// state attributes
	State string `yaml:"state"`
}

func init() {
	ResourceTypes.Register([]string{"exec"}, func(u *url.URL) Resource {
		x := NewExec()
		return x
	})
}

func NewExec() *Exec {
	return &Exec{}
}

func (x *Exec) Clone() Resource {
	return &Exec {
		Id: x.Id,
		CreateTemplate: x.CreateTemplate,
		ReadTemplate: x.ReadTemplate,
		UpdateTemplate: x.UpdateTemplate,
		DeleteTemplate: x.DeleteTemplate,
		State: x.State,
	}
}

func (x *Exec) StateMachine() machine.Stater {
	if x.stater == nil {
		x.stater = ProcessMachine(x)

	}
	return x.stater
}

func (x *Exec) URI() string {
	return fmt.Sprintf("exec://%s", x.Id)
}

func (x *Exec) SetURI(uri string) error {
	resourceUri, e := url.Parse(uri)
	if e == nil {
		if resourceUri.Scheme == "exec" {
			x.Id = filepath.Join(resourceUri.Hostname(), resourceUri.RequestURI())
		} else {
			e = fmt.Errorf("%w: %s is not an exec resource ", ErrInvalidResourceURI, uri)
		}
	}
	return e
}

func (x *Exec) UseConfig(config ConfigurationValueGetter) {
	x.config = config
}

func (x *Exec) ResolveId(ctx context.Context) string {
	return ""
}

func (x *Exec) Validate() error {
	return fmt.Errorf("failed")
}

func (x *Exec) Apply() error {
	return nil
}

func (x *Exec) Notify(m *machine.EventMessage) {
	ctx := context.Background()
	switch m.On {
	case machine.ENTERSTATEEVENT:
		switch m.Dest {
		case "start_create":
			if e := x.Create(ctx); e == nil {
				if triggerErr := x.stater.Trigger("created"); triggerErr == nil {
					return
				}
			}
			x.State = "absent"
		case "present":
			x.State = "present"
		}
	case machine.EXITSTATEEVENT:
	}
}

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

func (x *Exec) LoadDecl(yamlResourceDeclaration string) error {
	return codec.NewYAMLStringDecoder(yamlResourceDeclaration).Decode(x)
}

func (x *Exec) Type() string { return "exec" }

func (x *Exec) Create(ctx context.Context) error {
	return nil
}

func (x *Exec) Read(ctx context.Context) ([]byte, error) {
	return yaml.Marshal(x)
}