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

package workspace

import (
	"context"
	"slices"

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

	eventV1 "pocka.jp/x/yamori/proto/go/backend/events/v1"
	"pocka.jp/x/yamori/proto/go/backend/workspace/v1/types"
	errorV1 "pocka.jp/x/yamori/proto/go/error/v1"
	workspaceV2 "pocka.jp/x/yamori/proto/go/workspace/v2"

	"pocka.jp/x/yamori/backend/core"
	"pocka.jp/x/yamori/backend/core/event"
	"pocka.jp/x/yamori/backend/core/projection"
	workspaceEvent "pocka.jp/x/yamori/backend/events/workspace"
)

func deleteUserSystemError(message string) *connect.Response[workspaceV2.DeleteUserResponse] {
	return connect.NewResponse(&workspaceV2.DeleteUserResponse{
		Result: &workspaceV2.DeleteUserResponse_SystemError{
			SystemError: &errorV1.SystemError{
				Message: proto.String(message),
			},
		},
	})
}

func deleteUserAuthError() *connect.Response[workspaceV2.DeleteUserResponse] {
	return connect.NewResponse(&workspaceV2.DeleteUserResponse{
		Result: &workspaceV2.DeleteUserResponse_AuthenticationError{
			AuthenticationError: &errorV1.AuthenticationError{},
		},
	})
}

func deleteUserPermError() *connect.Response[workspaceV2.DeleteUserResponse] {
	return connect.NewResponse(&workspaceV2.DeleteUserResponse{
		Result: &workspaceV2.DeleteUserResponse_PermissionError{
			PermissionError: &errorV1.PermissionError{},
		},
	})
}

func deleteUserMissingField(path string) *connect.Response[workspaceV2.DeleteUserResponse] {
	return connect.NewResponse(&workspaceV2.DeleteUserResponse{
		Result: &workspaceV2.DeleteUserResponse_MissingFieldError{
			MissingFieldError: &errorV1.MissingFieldError{
				Path: proto.String(path),
			},
		},
	})
}

func (s *Service) DeleteUser(
	ctx context.Context,
	req *connect.Request[workspaceV2.DeleteUserRequest],
) (*connect.Response[workspaceV2.DeleteUserResponse], error) {
	logger := s.core.Logger.With(
		"service", "yamori.workspace.v2.WorkspaceService",
		"method", "DeleteUser",
	)

	header := req.Header()
	token, err := s.core.LoadTokenFromCookie(&header)
	if err != nil || token == nil {
		return deleteUserAuthError(), nil
	}

	tx, err := s.core.DB.Begin()
	if err != nil {
		logger.Error("Failed to begin transaction", "error", err)
		return deleteUserSystemError("Database error"), nil
	}
	defer tx.Rollback()

	secret, err := projection.GetLoginJwtSecret(tx)
	if err != nil {
		logger.Error("Failed to read login_jwt_secret projection", "error", err)
		return deleteUserSystemError("Database error"), nil
	}

	workspace, err := projection.GetWorkspace(tx)
	if err != nil {
		logger.Error("Failed to read workspace projection", "error", err)
		return deleteUserSystemError("Database error"), nil
	}

	users, err := projection.GetUsers(tx)
	if err != nil {
		logger.Error("Failed to read users projection", "error", err)
		return deleteUserSystemError("Database error"), nil
	}

	if err := event.UpdateProjections(tx, workspace, secret, users); err != nil {
		logger.Error("Failed to update projections", "error", err)
		return deleteUserSystemError("Database error"), nil
	}

	user, err := token.FindUser(secret, users)
	if err != nil {
		logger.Warn("Malformed token found", "error", err)
		return deleteUserAuthError(), nil
	}

	if req.Msg.Id == nil {
		return deleteUserMissingField("id"), nil
	}

	id := req.Msg.Id.GetValue()
	if id == "" {
		return deleteUserMissingField("id.value"), nil
	}

	for _, u := range users.Projection.Users {
		if u.GetId() == id {
			requiredPerm := types.Permission_PERMISSION_DELETE_REGULAR_USER
			if u.GetIsAdmin() {
				requiredPerm = types.Permission_PERMISSION_DELETE_ADMIN_USER
			}

			if !slices.Contains(user.Permissions, requiredPerm) {
				return deleteUserPermError(), nil
			}

			if u.GetIsAdmin() && workspace.Projection.GetNumberOfAdmins() == 1 {
				return connect.NewResponse(&workspaceV2.DeleteUserResponse{
					Result: &workspaceV2.DeleteUserResponse_YouAreTheOnlyAdmin{
						YouAreTheOnlyAdmin: req.Msg.Id,
					},
				}), nil
			}

			err := event.AppendEvents(tx, []*eventV1.Event{
				workspaceEvent.DeleteUser(id),
			})
			if err != nil {
				logger.Error("Failed to append user delete event", "error", err)
				return deleteUserSystemError("Database error"), nil
			}

			if err := event.UpdateProjections(tx, workspace, users); err != nil {
				logger.Error("Failed to update workspace and users projection")
				return deleteUserSystemError("Database error"), nil
			}

			if err := tx.Commit(); err != nil {
				logger.Error("Failed to commit transaction", "error", err)
				return deleteUserSystemError("Database error"), nil
			}

			res := connect.NewResponse(&workspaceV2.DeleteUserResponse{
				Result: &workspaceV2.DeleteUserResponse_Ok{
					Ok: projectionUserToMessage(u),
				},
			})

			if user.GetId() == id {
				header := res.Header()
				core.DeleteTokenFromCookie(&header)
			}

			return res, nil
		}
	}

	return connect.NewResponse(&workspaceV2.DeleteUserResponse{
		Result: &workspaceV2.DeleteUserResponse_NotFound{
			NotFound: &errorV1.NotFound{
				TypeName: proto.String("yamori.workspace.v2.User"),
			},
		},
	}), nil
}