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

package resource

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

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

	config ConfigurationValueGetter
	Resources ResourceMapper `yaml:"-" json:"-"`
}

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

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

func (x *Exec) SetResourceMapper(resources ResourceMapper) {
	x.Resources = resources
}

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

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() (err error) {
	var execJson []byte
	if execJson, err = x.JSON(); err == nil {
		s := NewSchema(x.Type())
		err = s.Validate(string(execJson))
	}
	return err
}

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
				}
			}
		case "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) JSON() ([]byte, error) {
	return json.Marshal(x)
}

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

func (x *Exec) Create(ctx context.Context) (err error) {
	x.CreateTemplate.Defaults()
	_, err = x.CreateTemplate.Execute(x)
	return err
}

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