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// SPDX-FileCopyrightText: 2025 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

package workspace

import (
	"context"
	"net/http"
	"strings"

	"connectrpc.com/connect"
	"google.golang.org/protobuf/proto"

	"pocka.jp/x/yamori/backend/core"
	"pocka.jp/x/yamori/backend/core/event"
	"pocka.jp/x/yamori/backend/core/projection"
	errorV1 "pocka.jp/x/yamori/proto/go/error/v1"
	workspaceV2 "pocka.jp/x/yamori/proto/go/workspace/v2"
	workspaceV2connect "pocka.jp/x/yamori/proto/go/workspace/v2/v2connect"
)

type Service struct {
	core *core.Core
}

func New(core *core.Core) *Service {
	return &Service{core: core}
}

func (s *Service) Logout(
	ctx context.Context,
	req *connect.Request[workspaceV2.LogoutRequest],
) (*connect.Response[workspaceV2.LogoutResponse], error) {
	res := workspaceV2.LogoutResponse{
		SystemError: &errorV1.SystemError{
			Message: proto.String("Not Implemented"),
		},
	}

	return connect.NewResponse(&res), nil
}

func (s *Service) Get(
	ctx context.Context,
	req *connect.Request[workspaceV2.GetRequest],
) (*connect.Response[workspaceV2.GetResponse], error) {
	res := workspaceV2.GetResponse{
		Result: &workspaceV2.GetResponse_SystemError{
			SystemError: &errorV1.SystemError{
				Message: proto.String("Not Implemented"),
			},
		},
	}

	return connect.NewResponse(&res), nil
}

func (s *Service) Update(
	ctx context.Context,
	req *connect.Request[workspaceV2.UpdateRequest],
) (*connect.Response[workspaceV2.UpdateResponse], error) {
	res := workspaceV2.UpdateResponse{
		Result: &workspaceV2.UpdateResponse_SystemError{
			SystemError: &errorV1.SystemError{
				Message: proto.String("Not Implemented"),
			},
		},
	}

	return connect.NewResponse(&res), nil
}

// TODO: 通常の追加フローも書く
func (s *Service) CreateUser(
	ctx context.Context,
	req *connect.Request[workspaceV2.CreateUserRequest],
) (*connect.Response[workspaceV2.CreateUserResponse], error) {
	logger := s.core.Logger.With(
		"service", "yamori.workspace.v2.WorkspaceService",
		"method", "CreateUser",
	)

	tx, err := s.core.DB.Begin()
	if err != nil {
		return nil, err
	}
	defer tx.Rollback()

	users, err := projection.GetUsers(tx)
	if err != nil {
		return nil, err
	}

	secret, err := projection.GetLoginJwtSecret(tx)
	if err != nil {
		return nil, err
	}

	if err := event.UpdateProjections(tx, users, secret); err != nil {
		return nil, err
	}

	header := req.Header()
	token, err := s.core.LoadTokenFromCookie(&header)
	if token == nil {
		if err != nil {
			logger.Warn("Failed to load token from cookie", "error", err)
		} else {
			logger.Debug("Unauthorized request made")
		}

		return connect.NewResponse(&workspaceV2.CreateUserResponse{
			Result: &workspaceV2.CreateUserResponse_AuthenticationError{
				AuthenticationError: &errorV1.AuthenticationError{},
			},
		}), nil
	}

	_, err = token.FindUser(secret, users)
	if err != nil {
		logger.Warn("Malformed token found", "error", err)

		return connect.NewResponse(&workspaceV2.CreateUserResponse{
			Result: &workspaceV2.CreateUserResponse_AuthenticationError{
				AuthenticationError: &errorV1.AuthenticationError{},
			},
		}), nil
	}

	name := req.Msg.GetName()
	if name == "" {
		return connect.NewResponse(&workspaceV2.CreateUserResponse{
			Result: &workspaceV2.CreateUserResponse_MissingFieldError{
				MissingFieldError: &errorV1.MissingFieldError{
					Path: proto.String("name"),
				},
			},
		}), nil
	}

	// TODO: SystemError 以外にする
	if strings.Trim(name, " \r\n\t") != name {
		return connect.NewResponse(&workspaceV2.CreateUserResponse{
			Result: &workspaceV2.CreateUserResponse_SystemError{
				SystemError: &errorV1.SystemError{
					Message: proto.String("Name cannot have heading or trailing spaces"),
				},
			},
		}), nil
	}

	displayName := strings.Trim(req.Msg.GetDisplayName(), " \r\n\t")
	if displayName == "" {
		displayName = name
	}

	password := req.Msg.GetPassword()
	if password == "" {
		return connect.NewResponse(&workspaceV2.CreateUserResponse{
			Result: &workspaceV2.CreateUserResponse_MissingFieldError{
				MissingFieldError: &errorV1.MissingFieldError{
					Path: proto.String("password"),
				},
			},
		}), nil
	}

	// TODO: SystemError 以外にする
	if len(password) <= 8 {
		return connect.NewResponse(&workspaceV2.CreateUserResponse{
			Result: &workspaceV2.CreateUserResponse_SystemError{
				SystemError: &errorV1.SystemError{
					Message: proto.String("Password has to be longer than or equals to 8 bytes"),
				},
			},
		}), nil
	}

	res := workspaceV2.CreateUserResponse{
		Result: &workspaceV2.CreateUserResponse_SystemError{
			SystemError: &errorV1.SystemError{
				Message: proto.String("Not Implemented"),
			},
		},
	}

	return connect.NewResponse(&res), nil
}

func (s *Service) Register(mux *http.ServeMux) {
	path, handler := workspaceV2connect.NewWorkspaceServiceHandler(s)

	mux.Handle(path, handler)
}