package api

import (
	"encoding/json"
	"os"
	"time"

	"git.eugeniocarvalho.dev/eugeniucarvalho/apicodegen/api/errs"
	"git.eugeniocarvalho.dev/eugeniucarvalho/apicodegen/api/sse"
	context "github.com/kataras/iris/v12/context"
	"go.mongodb.org/mongo-driver/bson/primitive"
)

type DebugStage struct {
	DebugEvent `json:",inline"`
	Events     []*DebugEvent `json:"events"`
}

type DebugEvent struct {
	ID      string      `json:"id"`
	Type    string      `json:"type"`
	Status  string      `json:"status"`
	Created int64       `json:"created"`
	Error   *errs.Error `json:"error"`
	Data    interface{} `json:"data"`
}

type DebugTaks struct {
	ID           string        `json:"id"`
	Status       string        `json:"status"`
	Created      int64         `json:"created"`
	Stages       []*DebugStage `json:"stages"`
	CurrentStage *DebugStage   `json:"-"`
	Debug        *Debugger     `json:"-"`
}

func NewDebugTaks() *DebugTaks {
	return &DebugTaks{
		Stages:       []*DebugStage{},
		CurrentStage: &DebugStage{},
	}
}

func (debug *DebugTaks) Stage(id string) *DebugStage {
	stage := &DebugStage{}
	stage.ID = id
	debug.CurrentStage = stage
	return stage
}

func (stage *DebugStage) PushEvent(event *DebugEvent) {
	stage.Events = append(stage.Events, event)
}

func (debug *DebugTaks) Event(eventType, eventId string) *DebugEvent {

	event := &DebugEvent{
		ID:      eventId,
		Type:    eventType,
		Created: time.Now().Unix(),
	}

	debug.CurrentStage.PushEvent(event)

	return event
}

func (task *DebugTaks) Finalize() {
	var (
		debug   = task.Debug
		out     []byte
		err     error
		channel = debug.Hub.GetChannel(debug.ChannelID)
	)

	if out, err = json.Marshal(task); err != nil {
		channel.Emit(&sse.Event{
			Kind:    "debugger.error",
			Payload: err.Error(),
		})
	} else {
		channel.Emit(&sse.Event{
			Kind:    "request",
			Payload: string(out),
		})
	}
}

type Debugger struct {
	ChannelID string
	Tasks     []*DebugTaks
	Hub       *sse.SSEHub
}

func (debug *Debugger) Handler() func(context.Context) {
	return func(ctx context.Context) {
		ctx.Values().Set("#debug", debug.CreateTask())
		ctx.Next()
	}
}

func (debug *Debugger) CreateTask() *DebugTaks {
	task := &DebugTaks{
		ID:      primitive.NewObjectID().Hex(),
		Status:  "",
		Created: time.Now().Unix(),
		Debug:   debug,
	}
	debug.Tasks = append(debug.Tasks, task)
	return task
}

func (debug *Debugger) EventStream() func(context.Context) (interface{}, *errs.Error) {
	return func(ctx context.Context) (resp interface{}, err *errs.Error) {
		if err = debug.Hub.UpgradeConnection(
			ctx,
			debug.ChannelID,
		); err != nil {
			return
		}
		resp = true
		return
	}
}

func NewDebug() *Debugger {
	return &Debugger{
		ChannelID: "debug",
		Tasks:     []*DebugTaks{},
		Hub: sse.NewSSEHub(&sse.SSEOptions{
			URI:               os.Getenv("REDIS_URI"),
			Password:          os.Getenv("REDIS_PASSWD"),
			ChannelCollection: "debugger",
		}),
	}
}