package slapshotapi

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"strings"

	"github.com/pkg/errors"
)

// --- Get Lobby ---

type endpointGetLobby struct {
	lobbyID string
}

func getEndpointGetLobby(lobbyID string) *endpointGetLobby {
	return &endpointGetLobby{lobbyID: lobbyID}
}

func (ep *endpointGetLobby) path() string {
	return fmt.Sprintf("/api/public/lobbies/%s", ep.lobbyID)
}

func (ep *endpointGetLobby) method() string {
	return "GET"
}

// ErrLobbyNotFound is returned when a lobby ID does not match any known lobby
var ErrLobbyNotFound = errors.New("lobby not found")

// GetLobby retrieves details for a specific lobby by its ID.
func (c *SlapAPI) GetLobby(
	ctx context.Context,
	lobbyID string,
) (*Lobby, error) {
	if lobbyID == "" {
		return nil, errors.New("lobbyID cannot be empty")
	}
	endpoint := getEndpointGetLobby(lobbyID)
	data, err := c.request(ctx, endpoint)
	if err != nil {
		if strings.Contains(err.Error(), "404") {
			return nil, ErrLobbyNotFound
		}
		return nil, errors.Wrap(err, "c.request")
	}
	lobby, err := unmarshal[Lobby](data)
	if err != nil {
		return nil, errors.Wrap(err, "unmarshal")
	}
	return lobby, nil
}

// --- Get Lobby Matches ---

type endpointGetLobbyMatches struct {
	lobbyID string
}

func getEndpointGetLobbyMatches(lobbyID string) *endpointGetLobbyMatches {
	return &endpointGetLobbyMatches{lobbyID: lobbyID}
}

func (ep *endpointGetLobbyMatches) path() string {
	return fmt.Sprintf("/api/public/lobbies/%s/matches", ep.lobbyID)
}

func (ep *endpointGetLobbyMatches) method() string {
	return "GET"
}

// GetLobbyMatches retrieves the list of matches played in a specific lobby.
func (c *SlapAPI) GetLobbyMatches(
	ctx context.Context,
	lobbyID string,
) ([]Game, error) {
	if lobbyID == "" {
		return nil, errors.New("lobbyID cannot be empty")
	}
	endpoint := getEndpointGetLobbyMatches(lobbyID)
	data, err := c.request(ctx, endpoint)
	if err != nil {
		if strings.Contains(err.Error(), "404") {
			return nil, ErrLobbyNotFound
		}
		return nil, errors.Wrap(err, "c.request")
	}
	var games []Game
	err = json.Unmarshal(data, &games)
	if err != nil {
		return nil, errors.Wrap(err, "json.Unmarshal")
	}
	return games, nil
}

// --- Create Lobby ---

type endpointCreateLobby struct {
	request LobbyCreationRequest
}

func getEndpointCreateLobby(req LobbyCreationRequest) *endpointCreateLobby {
	return &endpointCreateLobby{request: req}
}

func (ep *endpointCreateLobby) path() string {
	return "/api/public/lobbies"
}

func (ep *endpointCreateLobby) method() string {
	return "POST"
}

func (ep *endpointCreateLobby) body() ([]byte, error) {
	data, err := json.Marshal(ep.request)
	if err != nil {
		return nil, errors.Wrap(err, "json.Marshal")
	}
	return data, nil
}

// CreateLobby creates a new custom lobby with the specified settings.
func (c *SlapAPI) CreateLobby(
	ctx context.Context,
	req LobbyCreationRequest,
) (*LobbyCreationResponse, error) {
	if req.Region == "" {
		return nil, errors.New("region cannot be empty")
	}
	if req.Name == "" {
		return nil, errors.New("name cannot be empty")
	}
	if req.CreatorName == "" {
		return nil, errors.New("creator_name cannot be empty")
	}
	endpoint := getEndpointCreateLobby(req)
	data, err := c.request(ctx, endpoint)
	if err != nil {
		return nil, errors.Wrap(err, "c.request")
	}
	resp, err := unmarshal[LobbyCreationResponse](data)
	if err != nil {
		return nil, errors.Wrap(err, "unmarshal")
	}
	return resp, nil
}

// --- Delete Lobby ---

type endpointDeleteLobby struct {
	lobbyID string
}

func getEndpointDeleteLobby(lobbyID string) *endpointDeleteLobby {
	return &endpointDeleteLobby{lobbyID: lobbyID}
}

func (ep *endpointDeleteLobby) path() string {
	return fmt.Sprintf("/api/public/lobbies/%s", ep.lobbyID)
}

func (ep *endpointDeleteLobby) method() string {
	return "DELETE"
}

// DeleteLobby deletes an existing lobby by its ID.
// Returns true if the lobby was successfully deleted.
func (c *SlapAPI) DeleteLobby(
	ctx context.Context,
	lobbyID string,
) (bool, error) {
	if lobbyID == "" {
		return false, errors.New("lobbyID cannot be empty")
	}
	endpoint := getEndpointDeleteLobby(lobbyID)
	status, body, err := c.requestRaw(ctx, endpoint)
	if err != nil {
		return false, errors.Wrap(err, "c.requestRaw")
	}
	if status == http.StatusNotFound {
		return false, ErrLobbyNotFound
	}
	return string(body) == "OK", nil
}