package auth

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

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

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

type Module struct {
	service *Service
}

func NewModule(deps module.Dependencies, service *Service) *Module {
	return &Module{service: service}
}

func (m *Module) Name() string {
	return "auth"
}

func (m *Module) RegisterRoutes(router chi.Router) {
	router.Route("/installation", func(r chi.Router) {
		r.Get("/status", m.handleInstallationStatus)
		r.Post("/bootstrap-owner", m.handleBootstrapOwner)
	})
	router.Route("/auth", func(r chi.Router) {
		r.Post("/login", m.handleLogin)
		r.Post("/refresh", m.handleRefresh)
		r.Post("/sessions/revoke", m.handleRevokeAuthSession)
		r.Get("/devices", m.handleTrustedDevices)
		r.Post("/devices/{deviceID}/revoke", m.handleRevokeTrustedDevice)
	})
	router.Route("/users", func(r chi.Router) {
		r.Get("/", m.handleListUsers)
		r.Post("/", m.handleCreateUser)
	})
}

func (m *Module) handleInstallationStatus(w http.ResponseWriter, r *http.Request) {
	status, err := m.service.InstallationStatus(r.Context())
	if err != nil {
		statusCode, message := m.service.MapError(err)
		httpx.WriteError(w, statusCode, message)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, map[string]any{"installation": status})
}

func (m *Module) handleBootstrapOwner(w http.ResponseWriter, r *http.Request) {
	var cmd BootstrapOwnerCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid installation bootstrap payload")
		return
	}
	result, err := m.service.BootstrapOwner(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) handleLogin(w http.ResponseWriter, r *http.Request) {
	var cmd LoginCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid login payload")
		return
	}

	result, err := m.service.Login(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) handleListUsers(w http.ResponseWriter, r *http.Request) {
	actorUserID := r.URL.Query().Get("actor_user_id")
	users, err := m.service.ListUsers(r.Context(), actorUserID)
	if err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusOK, map[string]any{"users": users})
}

func (m *Module) handleCreateUser(w http.ResponseWriter, r *http.Request) {
	var cmd CreateUserCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid user payload")
		return
	}
	user, err := m.service.CreateUser(r.Context(), cmd)
	if err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}
	httpx.WriteJSON(w, http.StatusCreated, map[string]any{"user": user})
}

func (m *Module) handleRefresh(w http.ResponseWriter, r *http.Request) {
	var cmd RefreshCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid refresh payload")
		return
	}

	result, err := m.service.Refresh(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) handleRevokeAuthSession(w http.ResponseWriter, r *http.Request) {
	var cmd RevokeAuthSessionCommand
	if err := json.NewDecoder(r.Body).Decode(&cmd); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid auth session revoke payload")
		return
	}

	if err := m.service.RevokeAuthSession(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": "revoked",
		"message": httpx.NewMessage(
			"auth.session.revoked",
			"status.auth.session.revoked",
			"Auth session revoked.",
			nil,
			"",
		),
	})
}

func (m *Module) handleTrustedDevices(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
	}

	devices, err := m.service.ListTrustedDevices(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{
		"devices": devices,
	})
}

func (m *Module) handleRevokeTrustedDevice(w http.ResponseWriter, r *http.Request) {
	var payload struct {
		UserID string `json:"user_id"`
		Reason string `json:"reason"`
	}
	if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "invalid device revoke payload")
		return
	}

	err := m.service.RevokeTrustedDevice(r.Context(), RevokeDeviceCommand{
		UserID:   payload.UserID,
		DeviceID: chi.URLParam(r, "deviceID"),
		Reason:   payload.Reason,
	})
	if err != nil {
		status, message := m.service.MapError(err)
		httpx.WriteError(w, status, message)
		return
	}

	httpx.WriteJSON(w, http.StatusAccepted, map[string]any{
		"status": "revoked",
		"message": httpx.NewMessage(
			"auth.device.revoked",
			"status.auth.device.revoked",
			"Trusted device revoked.",
			nil,
			"",
		),
	})
}