package sessionbroker

import (
	"encoding/json"
	"net/http"

	"github.com/go-chi/chi/v5"

	"github.com/example/remote-access-platform/backend/internal/platform/httpx"
)

type Module struct {
	service *Service
}

func NewModule(service *Service) *Module {
	return &Module{service: service}
}

func (m *Module) Name() string {
	return "session-broker"
}

func (m *Module) Service() *Service {
	return m.service
}

func (m *Module) RegisterRoutes(router chi.Router) {
	router.Route("/sessions", func(r chi.Router) {
		r.Get("/", m.listSessions)
		r.Post("/", m.startSession)
		r.Post("/{sessionID}/attach", m.attachSession)
		r.Post("/{sessionID}/detach", m.detachSession)
		r.Post("/{sessionID}/takeover", m.takeoverSession)
		r.Post("/{sessionID}/terminate", m.terminateSession)
		r.Post("/{sessionID}/fail", m.markFailed)
	})
}

func (m *Module) listSessions(w http.ResponseWriter, r *http.Request) {
	userID := r.URL.Query().Get("user_id")
	if userID == "" {
		httpx.WriteError(w, http.StatusBadRequest, "user_id is required")
		return
	}
	sessions, err := m.service.ListSessions(r.Context(), userID)
	if err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, map[string]any{"sessions": sessions})
}

func (m *Module) startSession(w http.ResponseWriter, r *http.Request) {
	var cmd StartRemoteSessionCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid start session payload")
		return
	}
	result, err := m.service.StartRemoteSession(r.Context(), cmd)
	if err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusCreated, result)
}

func (m *Module) attachSession(w http.ResponseWriter, r *http.Request) {
	var cmd AttachToSessionCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid attach session payload")
		return
	}
	cmd.SessionID = chi.URLParam(r, "sessionID")
	result, err := m.service.AttachToSession(r.Context(), cmd)
	if err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, result)
}

func (m *Module) detachSession(w http.ResponseWriter, r *http.Request) {
	var cmd DetachFromSessionCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid detach session payload")
		return
	}
	cmd.SessionID = chi.URLParam(r, "sessionID")
	result, err := m.service.DetachFromSession(r.Context(), cmd)
	if err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusAccepted, result)
}

func (m *Module) takeoverSession(w http.ResponseWriter, r *http.Request) {
	var cmd TakeoverSessionCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid takeover session payload")
		return
	}
	cmd.SessionID = chi.URLParam(r, "sessionID")
	result, err := m.service.TakeoverSession(r.Context(), cmd)
	if err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, result)
}

func (m *Module) terminateSession(w http.ResponseWriter, r *http.Request) {
	var cmd TerminateSessionCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid terminate session payload")
		return
	}
	cmd.SessionID = chi.URLParam(r, "sessionID")
	if err := m.service.TerminateSession(r.Context(), cmd); err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusAccepted, map[string]any{
		"status": "terminated",
		"message": httpx.NewMessage(
			"session.terminated",
			"status.session.terminated",
			"Session terminated.",
			nil,
			"",
		),
	})
}

func (m *Module) markFailed(w http.ResponseWriter, r *http.Request) {
	var cmd MarkSessionFailedCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid fail session payload")
		return
	}
	cmd.SessionID = chi.URLParam(r, "sessionID")
	if err := m.service.MarkSessionFailed(r.Context(), cmd); err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusAccepted, map[string]any{
		"status": "failed",
		"message": httpx.NewMessage(
			"session.failed",
			"status.session.failed",
			"Session marked as failed.",
			nil,
			"",
		),
	})
}