package client

import (
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"

	"git.faercol.me/faercol/http-boot-server/bootserver/config"
	"git.faercol.me/faercol/http-boot-server/bootserver/helpers"
	"git.faercol.me/faercol/http-boot-server/bootserver/homeassistant"
	"git.faercol.me/faercol/http-boot-server/bootserver/services"
	"github.com/google/uuid"
	"github.com/sirupsen/logrus"
)

const SetBootRoute = "/config/boot"

type setBootOptionPayload struct {
	ClientID string `json:"client_id"`
	OptionID string `json:"option_id"`
}

type BootController struct {
	clientService *services.ClientHandlerService
	appConf       *config.AppConfig
	l             *logrus.Logger
}

func NewBootController(logger *logrus.Logger, service *services.ClientHandlerService, conf *config.AppConfig) *BootController {
	return &BootController{
		clientService: service,
		l:             logger,
		appConf:       conf,
	}
}

func (bc *BootController) setBootOption(w http.ResponseWriter, r *http.Request) (int, []byte, error) {
	dat, err := io.ReadAll(r.Body)
	if err != nil {
		return http.StatusInternalServerError, nil, fmt.Errorf("failed to read body: %w", err)
	}
	var payload setBootOptionPayload
	if err := json.Unmarshal(dat, &payload); err != nil {
		return http.StatusBadRequest, nil, fmt.Errorf("failed to parse body: %w", err)
	}

	clientID, err := uuid.Parse(payload.ClientID)
	if err != nil {
		return http.StatusBadRequest, []byte("bad client ID"), fmt.Errorf("invalid format for client ID: %w", err)
	}
	optionID, err := uuid.Parse(payload.OptionID)
	if err != nil {
		return http.StatusBadRequest, []byte("bad option ID"), fmt.Errorf("invalid format for option ID: %w", err)
	}

	if err := bc.clientService.SetClientBootOption(clientID, optionID.String()); err != nil {
		if errors.Is(err, services.ErrUnknownClient) {
			return http.StatusNotFound, []byte("unknown client"), err
		}
		if errors.Is(err, services.ErrUnknownBootOption) {
			return http.StatusNotFound, []byte("unknown boot option"), err
		}
		return http.StatusInternalServerError, nil, fmt.Errorf("failed to set boot option for client: %w", err)
	}

	if bc.appConf.HomeAssistantEnabled {
		bc.l.Debug("Notifying HomeAssistant of change")
		newConf, err := bc.clientService.GetClientConfig(clientID)
		if err != nil {
			bc.l.Errorf("Failed to get new config to send to HA: %s", err.Error())
		} else {
			if err := homeassistant.New(bc.appConf).SendBootOption(r.Context(), newConf.Name, newConf.Options[newConf.SelectedOption].Name); err != nil {
				bc.l.Errorf("Failed to notify HA: %s", err.Error())
			}
		}
	}

	return http.StatusAccepted, nil, nil
}

func (bc *BootController) deleteClient(w http.ResponseWriter, r *http.Request) (int, []byte, error) {
	dat, err := io.ReadAll(r.Body)
	if err != nil {
		return http.StatusInternalServerError, nil, fmt.Errorf("failed to read body: %w", err)
	}
	var payload setBootOptionPayload
	if err := json.Unmarshal(dat, &payload); err != nil {
		return http.StatusBadRequest, nil, fmt.Errorf("failed to parse body: %w", err)
	}

	clientID, err := uuid.Parse(payload.ClientID)
	if err != nil {
		return http.StatusBadRequest, []byte("bad client ID"), fmt.Errorf("invalid format for client ID: %w", err)
	}
	if err := bc.clientService.DeleteClient(clientID); err != nil {
		return http.StatusInternalServerError, []byte("failed to delete client"), fmt.Errorf("failed to delete client: %w", err)
	}

	return http.StatusOK, nil, nil
}

func (bc *BootController) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	var returncode int
	var content []byte
	var err error

	switch r.Method {
	case http.MethodPut:
		returncode, content, err = bc.setBootOption(w, r)
		if err != nil {
			bc.l.Errorf("Error setting boot option for client: %s", err.Error())
		}
	case http.MethodDelete:
		returncode, content, err = bc.deleteClient(w, r)
		if err != nil {
			bc.l.Errorf("Error setting boot option for client: %s", err.Error())
		}
	default:
		helpers.HandleResponse(w, r, http.StatusMethodNotAllowed, nil, bc.l)
		return
	}

	helpers.HandleResponse(w, r, returncode, content, bc.l)
}