from .connection_change_filesystem import (
    switch_managed_dataset_connection_to_cloud_storage,
    change_filesystem_dataset_format,
    change_filesystem_dataset_path,
    change_folder_path,
    switch_managed_folder_connection,
    switch_managed_dataset_connection_to_local_filesytem_storage
)
from .connection_change_sql import (
    switch_managed_dataset_connection_to_sql,
    change_sql_dataset_table,
    autodetect_sql_dataset_schema
)
from ..datasets.dataset_commons import (
    get_dataset_in_connection_settings,
    infer_and_update_dataset_schema,
    update_dataset_varchar_limit,
    change_dataset_managed_state,
    disable_dataset_metastore_synchronization,
    get_dataset_connection_type
)
from ...projects.project_commons import (
    get_all_project_dataset_names,
    get_all_project_folder_names,
    get_all_project_recipe_names_with_chosen_type
)
from ...projects.flow_graph.flow_graph_utils import (get_flow_element_successors_names_and_types,
                                                     get_flow_input_dataset_names
                                                     )
from ..recipes.recipe_commons import get_recipe_settings_and_dictionary
from ..recipes.sync_recipe import sync_dataset_to_connection
from ...type_checking import DSSProject, check_object_is_project


class FlowConnectionsHandler:
    """
    Handles flow connection changes for both datasets and folders.
    """

    # SQL storages:
    ALLOWED_SQL_STORAGES = ["PostgreSQL", "Snowflake", "SQLServer"]
    ALLOWED_CLOUD_PROVIDERS_SQL_STORAGES = ["Redshift", "BigQuery"]
    # Filesystem storages:
    ALLOWED_CLOUD_PROVIDERS_FILESYSTEM_STORAGES = ["Azure", "S3", "GCS"]
    CLOUD_PROVIDERS_SQL_DATABASES_FILESYSTEM_STORAGES = {"Redshift": "S3", "Synapse": "Azure", "BigQuery": "GCS"}
    # All allowed storages:
    ALL_ALLOWED_SQL_STORAGES = ALLOWED_SQL_STORAGES + ALLOWED_CLOUD_PROVIDERS_SQL_STORAGES
    ALL_ALLOWED_FILESYSTEM_STORAGES = ["Filesystem"] + ALLOWED_CLOUD_PROVIDERS_FILESYSTEM_STORAGES
    ALL_ALLOWED_CONNECTIONS = ALL_ALLOWED_SQL_STORAGES + ALL_ALLOWED_FILESYSTEM_STORAGES
    CONNECTIONS_VARCHAR_LIMITS = {
        "Azure": 4000,
        "BigQuery": 419000,
        "Filesystem": 419000,
        "GCS": 419000,
        "PostgreSQL": 419000,
        "Redshift": 65000,
        "Snowflake": 419000,
        "SQLServer": 419000,
        "S3": 65000,
    }
    # File formats:
    ALLOWED_FILESYSTEM_STORAGES_FILE_FORMATS = ["csv", "parquet"]
    DEFAULT_FILESYSTEM_STORAGES_FILE_FORMAT = "csv"

    # Recipes requiring fast-path adaptations:
    RECIPE_TYPES_REQUIRING_FAST_PATH_ADAPTATIONS = ["python", "r", "clustering_cluster",
                                                    "clustering_scoring", "prediction_scoring",
                                                    "evaluation", "export"]
    
    DEFAULT_INPUT_DATASET_TYPES_TO_PRESERVE = ["UploadedFiles", "Inline"] # More types in projects/datasets/dataset_types

    def __init__(
            self,
            project: DSSProject,
            main_connection_name: str,
            fallback_connection_name: str,
            input_datasets: list=[],
            input_datasets_to_preserve: list=[],
            fallback_connection_datasets: list=[],
            fallback_connection_datasets_downstream_recipes: dict={},
            input_folders: list=[],
            bool_change_computed_folders_connections: bool=False,
            folders_connection_name: str=None,
            project_folders_to_preserve: list=[],
            table_naming_letter_case: str="dataiku_case"):
        """
        :param project: DSSProject: A handle to interact with a project on the DSS instance.

        :param main_connection_name: str: Name of the main connection to use in the flow.

        :param fallback_connection_name: str: Name of the fallback connection to use in the flow.
            Fallback connection is only used when 'main_connection_name'
            has a type in ['Redshift', 'Synapse', or 'BigQuery']

        :param input_datasets: list: List of all dataset names that are the flow inputs. All datasets within this list
            that are not in 'input_datasets_to_preserve' will have their connection changed toward
            'main_connection_name'.

        :param input_datasets_to_preserve: list: List of all dataset names that are the flow inputs and should NOT
            have their connections changed.

        :param fallback_connection_datasets: list: List of all dataset names that need to be
            stored in the 'fallback_connection_name' dued to DSS performances when writing in 'main_connection_name'.
            All datasets resulting from python processes (python recipes, score/evaluate/apply) should by default
            be in this list.
            Datasets in this list that need downstream recipes to leverage 'main_connection_name' engine will be
            automatically connected to sync recipes that will synchronize them
            from 'fallback_connection_name' toward 'main_connection_name'.

        :param fallback_connection_datasets_downstream_recipes: dict: Mapping of all recipes connected to
            datasets mentioned in 'fallback_connection_datasets' that need downstream recipes to leverage
            'main_connection_name'.
            This mapping allows to replace original datasets (stored in'fallback_connection_name') by datasets
            resulting from the sync recipes (stored in 'main_connection_name').

            Example: fallback_connection_datasets_downstream_recipes =
                {'dataset_x': ['recipe_with_dataset_x_as_input_1', 'recipe_with_dataset_x_as_input_2'],
                 'dataset_y': ['recipe_with_dataset_y_as_input'],
                 'dataset_z': ['recipe_with_dataset_z_as_input_1',
                              'recipe_with_dataset_z_as_input_2',
                              'recipe_with_dataset_z_as_input_3']}

        :param input_folders: list: List of all folder names that are the flow inputs. All folder within this list
            that are not in 'project_folders_to_preserve' will have their connection changed toward
            'folders_connection'.

        :param bool_change_computed_folders_connections: bool: Precise if computed folders need to have their
            connection changed.

        :param folders_connection_name: str: Name of the connection to use in the flow for folders.

        :param project_folders_to_preserve: list: List of all folder names that should NOT have their
            connections changed.
        
        :param table_naming_letter_case: str: [ONLY FOR SQL STORAGES]
        Letter case used to name the table in the connection. Possible values are:
        - 'dataiku_case' [default value]: If this letter case is selected, the name of the table will be:
            --> "{project_key}_{dataset_name}" if this concatenation is not hashed, 
                with 'project_key' in uppercase and 'dataset_name' in the same case.
            --> result of 'sha256' hashing applied on "{PROJECT_KEY}_dataset_name" if it is hashed due to 
                a table name too long for the used connection.
        - 'uppercase': If this letter case is selected, the name of the table will be in uppercase.
            In that case, the project key will be hard coded in uppercase instead of using the variable '${projectKey}'.
        - 'lowercase': If this letter case is selected, the name of the table will be in lowercase.
            In that case, the project key will be hard coded in lowercase instead of using the variable '${projectKey}'.
        """
        check_object_is_project(project)
        self.project = project
        self.main_connection_name = main_connection_name
        self.main_connection_settings = None
        self.main_connection_type = None
        self.main_connection_varchar_limit = None
        if fallback_connection_name is not None:
            self.fallback_connection_name = fallback_connection_name
        else:
            self.fallback_connection_name = None
        self.fallback_connection_settings = None
        self.fallback_connection_type = None
        self.fallback_connection_varchar_limit = None

        self.input_folders = input_folders
        self.flow_has_input_folders = (len(input_folders) > 0)
        self.bool_change_computed_folders_connections = bool_change_computed_folders_connections
        self.folders_connection_name = folders_connection_name
        self.folders_connection_settings = None
        self.folders_connection_type = None

        self.load_connections_information()
        self.check_connections_compatibility()

        self.fallback_connection_datasets, self.fallback_connection_datasets_downstream_recipes =\
            self.compute_fallback_connection_dependencies(fallback_connection_datasets,
                                                          fallback_connection_datasets_downstream_recipes)

        project_datasets = get_all_project_dataset_names(project)
        self.input_datasets_to_preserve = input_datasets_to_preserve
        if (len(input_datasets) == 0):
            self.load_input_datasets()
        else:
            self.input_datasets = input_datasets
        self.load_input_datasets_to_preserve()
        self.dataset_with_connections_to_be_changed = [
            dataset for dataset in project_datasets if dataset not in self.input_datasets_to_preserve
        ]

        self.datasets_that_should_be_not_managed = [
            dataset for dataset in self.input_datasets if dataset not in self.input_datasets_to_preserve
        ]

        self.datasets_that_should_be_managed = [
            dataset
            for dataset in self.dataset_with_connections_to_be_changed
            if dataset not in self.datasets_that_should_be_not_managed
        ]

        all_project_folders = get_all_project_folder_names(project)
        main_connection_from_a_cloud_provider =\
            (self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_SQL_STORAGES)\
            or (self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_FILESYSTEM_STORAGES)

        if main_connection_from_a_cloud_provider:
            self.bool_change_computed_folders_connections = True

        self.folders_with_connections_to_be_changed = [
            folder for folder in all_project_folders if folder not in project_folders_to_preserve
        ]
        self.table_naming_letter_case = table_naming_letter_case
        pass
    
    def load_input_datasets(self):
        flow_input_dataset_names = get_flow_input_dataset_names(self.project)
        input_datasets = []
        for dataset_name in flow_input_dataset_names:
            if dataset_name not in self.input_datasets_to_preserve:
                dataset_connection_type = get_dataset_connection_type(self.project, dataset_name)
                if dataset_connection_type not in self.DEFAULT_INPUT_DATASET_TYPES_TO_PRESERVE:
                    input_datasets.append(dataset_name)
        self.input_datasets = input_datasets
        pass

    def load_input_datasets_to_preserve(self):
        flow_input_dataset_names = get_flow_input_dataset_names(self.project)
        for dataset_name in flow_input_dataset_names:
            dataset_connection_type = get_dataset_connection_type(self.project, dataset_name)
            if dataset_connection_type in self.DEFAULT_INPUT_DATASET_TYPES_TO_PRESERVE:
                if dataset_name not in self.input_datasets_to_preserve:
                    self.input_datasets_to_preserve.append(dataset_name)
        pass

    def compute_fallback_connection_dependencies(self, provided_fallback_connection_datasets,
                                                 provided_fallback_connection_datasets_downstream_recipes):
        computed_fallback_connection_datasets = []
        computed_fallback_connection_datasets_downstream_recipes = {}
        for recipe_type in self.RECIPE_TYPES_REQUIRING_FAST_PATH_ADAPTATIONS:
            flow_recipes_with_type = get_all_project_recipe_names_with_chosen_type(self.project, recipe_type)
            for recipe_name in flow_recipes_with_type:
                recipe_successors, recipe_successors_types =\
                    get_flow_element_successors_names_and_types(self.project, recipe_name)
                for successor_name, successor_type in zip(recipe_successors, recipe_successors_types):
                    if successor_type == "COMPUTABLE_DATASET":
                        computed_fallback_connection_datasets.append(successor_name)
                        dataset_successors, dataset_successors_types = \
                            get_flow_element_successors_names_and_types(self.project, successor_name)
                        dataset_downstream_recipes = []
                        for dataset_successor, dataset_successor_type in zip(dataset_successors,
                                                                             dataset_successors_types):
                            if dataset_successor_type == "RUNNABLE_RECIPE":
                                dataset_downstream_recipes.append(dataset_successor)
                        computed_fallback_connection_datasets_downstream_recipes[successor_name] =\
                            dataset_downstream_recipes
        if isinstance(provided_fallback_connection_datasets, list):
            for dataset_name in provided_fallback_connection_datasets:
                provided_downstream_recipes = provided_fallback_connection_datasets_downstream_recipes.get(dataset_name)
                if dataset_name not in computed_fallback_connection_datasets_downstream_recipes.keys():
                    computed_fallback_connection_datasets_downstream_recipes[dataset_name] = []
                computed_downstream_recipes = computed_fallback_connection_datasets_downstream_recipes.get(dataset_name)
                if dataset_name not in computed_fallback_connection_datasets:
                    computed_fallback_connection_datasets.append(dataset_name)

                if isinstance(provided_downstream_recipes, list):
                    for recipe_name in provided_downstream_recipes:
                        if recipe_name not in computed_downstream_recipes:
                            computed_fallback_connection_datasets_downstream_recipes[dataset_name].append(recipe_name)

        return computed_fallback_connection_datasets, computed_fallback_connection_datasets_downstream_recipes

    def load_connections_information(self):
        """
        Loads all connection information:
            - Connection types.
            - Connection settings.
            - Connection varchar limits.
        """
        print("Loading connections information ...")
        if self.main_connection_name is None:
            log_message = "You can't use FlowConnectionsHandler without defining 'main_connection_name'"
            raise ValueError(log_message)
        else:
            self.main_connection_settings = get_dataset_in_connection_settings(self.project,
                                                                               self.main_connection_name)
            self.main_connection_type = self.main_connection_settings["type"]
            self.main_connection_varchar_limit = self.CONNECTIONS_VARCHAR_LIMITS[self.main_connection_type]

        if self.fallback_connection_name is not None:
            self.fallback_connection_settings =\
                get_dataset_in_connection_settings(self.project, self.fallback_connection_name)
            self.fallback_connection_type = self.fallback_connection_settings["type"]
            self.fallback_connection_varchar_limit = self.CONNECTIONS_VARCHAR_LIMITS[self.fallback_connection_type]

        if self.flow_has_input_folders:
            self.folders_connection_settings =\
                get_dataset_in_connection_settings(self.project, self.folders_connection_name)
            self.folders_connection_type = self.folders_connection_settings["type"]
        pass

    def check_connections_compatibility(self):
        """
        Checks that connections can be used.
        """
        print("Checking connections compatibility ...")
        connection_names = [self.main_connection_name, self.fallback_connection_name, self.folders_connection_name]
        connection_types = [self.main_connection_type, self.fallback_connection_type, self.folders_connection_type]
        for connection_name, connection_type in zip(connection_names, connection_types):
            if connection_type is not None:
                if connection_type not in self.ALL_ALLOWED_CONNECTIONS:
                    log_message = (
                        "Connection '{}' is of type '{}' that is not compatible with FlowConnectionsHandler,"
                        " please use a connection in '{}'".format(
                            connection_name, connection_type, self.ALL_ALLOWED_CONNECTIONS
                            )
                    )
                    raise ValueError(log_message)
        if self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_SQL_STORAGES:
            compatible_fallback_connection_type = self.CLOUD_PROVIDERS_SQL_DATABASES_FILESYSTEM_STORAGES[
                self.main_connection_type
            ]
            if compatible_fallback_connection_type != self.fallback_connection_type:
                log_message = (
                    "Your main connection ('{}') being of type '{}', you must have a fallback filesystem "
                    "connection of type '{}'.\n Actual fallback filesystem connection ('{}') is of type '{}'".format(
                        self.main_connection_name,
                        self.main_connection_type,
                        compatible_fallback_connection_type,
                        self.fallback_connection_name,
                        self.fallback_connection_type,
                    )
                )
                raise ValueError(log_message)
        print("Connections compatibility checked !")
        pass

    def switch_flow_datasets_connections(self, managed_datasets_write_file_format=None,
                                         bool_infer_fallback_connection_datasets_write_file_format_type=True):
        """
        Changes flow datasets connections, based on the parameters set in:
            - 'main_connection_name'
            - 'fallback_connection_name'
            - 'input_datasets'
            - 'input_datasets_to_preserve'
            - 'fallback_connection_datasets'

        :param managed_datasets_write_file_format: str: File format of the managed datasets, with a value in
            'ALLOWED_FILESYSTEM_STORAGES_FILE_FORMATS'.
        """
        print("Switching all flow datasets connections ...")
        if managed_datasets_write_file_format is None:
            managed_datasets_write_file_format = self.DEFAULT_FILESYSTEM_STORAGES_FILE_FORMAT
        
        
        for dataset_name in self.dataset_with_connections_to_be_changed:
            # First all datasets are set to 'managed' state:
            change_dataset_managed_state(self.project, dataset_name, True)
            print("Currently changing dataset '{}' connection ...".format(dataset_name))
            if self.main_connection_type in self.ALLOWED_SQL_STORAGES:
                adapt_table_namings = True
                switch_managed_dataset_connection_to_sql(
                    self.project, dataset_name, self.main_connection_name, adapt_table_namings,
                    self.table_naming_letter_case
                )
                update_dataset_varchar_limit(self.project, dataset_name, self.main_connection_varchar_limit)
                pass

            elif self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_SQL_STORAGES:
                if dataset_name not in self.fallback_connection_datasets:
                    # Main connection datasets handling:
                    adapt_table_namings = True
                    switch_managed_dataset_connection_to_sql(self.project, dataset_name, self.main_connection_name,
                                                             adapt_table_namings, self.table_naming_letter_case)
                    update_dataset_varchar_limit(self.project, dataset_name, self.main_connection_varchar_limit)
                else:
                    # Fallback connection datasets handling:
                    switch_managed_dataset_connection_to_cloud_storage(self.project, dataset_name,
                                                                       self.fallback_connection_name)
                    update_dataset_varchar_limit(self.project, dataset_name, self.fallback_connection_varchar_limit)
                    if bool_infer_fallback_connection_datasets_write_file_format_type:
                        if self.fallback_connection_type == "S3":
                            change_filesystem_dataset_format(project=self.project,
                                                             dataset_name=dataset_name,
                                                             new_dataset_format="csv",
                                                             change_dataset_format_type=True,
                                                             new_dataset_format_type="redshift_sync_compatible_csv" # Works as well with 'metastore_compatible_csv'
                                                             )
                        elif self.fallback_connection_type == "GCS":
                            change_filesystem_dataset_format(project=self.project,
                                                             dataset_name=dataset_name,
                                                             new_dataset_format="csv",
                                                             change_dataset_format_type=True,
                                                             new_dataset_format_type="big_query_sync_compatible_csv" 
                                                             )
                        else:
                            change_filesystem_dataset_format(project=self.project,
                                                             dataset_name=dataset_name,
                                                             new_dataset_format="csv")


            elif self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_FILESYSTEM_STORAGES:
                switch_managed_dataset_connection_to_cloud_storage(self.project, dataset_name,
                                                                   self.main_connection_name)
                update_dataset_varchar_limit(self.project, dataset_name, self.main_connection_varchar_limit)
                if dataset_name in self.datasets_that_should_be_managed:
                    change_filesystem_dataset_format(project=self.project,
                                                     dataset_name=dataset_name,
                                                     new_dataset_format=managed_datasets_write_file_format,
                                                     change_dataset_format_type=False,
                                                     new_dataset_format_type=None)

            elif self.main_connection_type == "Filesystem":
                switch_managed_dataset_connection_to_local_filesytem_storage(self.project, dataset_name,
                                                                             self.main_connection_name)
                update_dataset_varchar_limit(self.project, dataset_name, self.main_connection_varchar_limit)
                if dataset_name in self.datasets_that_should_be_managed:
                    change_filesystem_dataset_format(project=self.project,
                                                     dataset_name=dataset_name,
                                                     new_dataset_format=managed_datasets_write_file_format,
                                                     change_dataset_format_type=False,
                                                     new_dataset_format_type=None)

            else:
                log_message = ("Your main connection ('{}') has connection type '{}' that is not compatible with"
                               " 'FlowConnectionsHandler'.".format(self.main_connection_name,
                                                                   self.main_connection_type))
                raise ValueError(log_message)
        print("Flow datasets connections switched !")
        pass

    def disable_managed_datasets_metastore_synchronization(self):
        print("Disabling all flow managed datasets metastore synchronization...")
        for dataset_name in self.datasets_that_should_be_managed:
            disable_dataset_metastore_synchronization(self.project, dataset_name)
        pass

    def switch_flow_folders_connections(self):
        """
        Changes flow folders connections, based on the parameters set in:
            - 'input_folders'
            - 'bool_change_computed_folders_connections'
            - 'folders_connection_name'
            - 'project_folders_to_preserve'
        """
        if self.bool_change_computed_folders_connections:
            if self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_SQL_STORAGES:
                computed_folders_connection = self.fallback_connection_name
            elif self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_FILESYSTEM_STORAGES:
                computed_folders_connection = self.main_connection_name
            else:
                computed_folders_connection = self.folders_connection_name
            print("Switching flow folders connections ...")
            for folder_name in self.folders_with_connections_to_be_changed:
                if folder_name not in self.input_folders:
                    print("Switching computed folder '{}' connection toward '{}' ..."\
                          .format(folder_name, computed_folders_connection))
                    switch_managed_folder_connection(self.project, folder_name, computed_folders_connection)
            print("All flow computed folders connections switched !")

        if self.flow_has_input_folders:
            for folder_name in self.input_folders:
                print("Switching input folder '{}' connection toward '{}' ...".format(folder_name,
                                                                                      self.folders_connection_name))
                switch_managed_folder_connection(self.project, folder_name, self.folders_connection_name)
            print("All flow input folders connections switched !")
        pass

    def switch_input_datasets_to_not_managed_sate(self):
        """
        Forces all flow input datasets to be 'not managed'.
        """
        print("Switching flow input datasets to 'not managed' state. Concerned datasets are: {}"\
              .format(self.datasets_that_should_be_not_managed))
        for dataset_name in self.datasets_that_should_be_not_managed:
            change_dataset_managed_state(self.project, dataset_name, False)
        print("Flow input dataset switched to not managed state !")
        pass

    def adapt_flow_to_fast_path(self):
        """
        Adapts the flow to fast path based on parameters:
        - 'fallback_connection_datasets'
        - 'fallback_connection_datasets_downstream_recipes'

        All datasets present in 'fallback_connection_datasets' and with a reference in
        'fallback_connection_datasets_downstream_recipes' will be used as input of sync recipes synchronizing them
        toward 'main_connection'. Then, recipes that used these dataset as inputs will be connected to the outputs of
        the sync recipes.
        """
        for fallback_connection_dataset in self.fallback_connection_datasets:
            use_fast_path =\
                (fallback_connection_dataset in self.fallback_connection_datasets_downstream_recipes.keys())\
                and\
                (self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_SQL_STORAGES)
            if use_fast_path:
                sync_dataset_to_connection(self.project, fallback_connection_dataset, self.main_connection_name)
                synced_dataset_name = "{}_synced".format(fallback_connection_dataset)
                downstream_recipe_names =\
                    self.fallback_connection_datasets_downstream_recipes[fallback_connection_dataset]
                for downstream_recipe_name in downstream_recipe_names:
                    downstream_project_recipe_settings, downstream_project_recipe_settings_dict = \
                        get_recipe_settings_and_dictionary(self.project, downstream_recipe_name, True)
                    downstream_project_recipe_type = downstream_project_recipe_settings_dict["type"]
                    fast_path_not_applied = (downstream_project_recipe_type != 'sync')
                    if self.main_connection_type in self.ALLOWED_CLOUD_PROVIDERS_SQL_STORAGES:
                        if fast_path_not_applied:
                            print("Adapting flow structure to fast path ..."\
                                  " Datasets '{}' will be synced using path  '{}' ('{}') -->  '{}' ('{}') !".format(
                                    self.fallback_connection_datasets,
                                    self.fallback_connection_name,
                                    self.fallback_connection_type,
                                    self.main_connection_name,
                                    self.main_connection_type))
                            downstream_project_recipe_settings.replace_input(fallback_connection_dataset,
                                                                             synced_dataset_name)

                            update_dataset_varchar_limit(self.project, fallback_connection_dataset,
                                                         self.fallback_connection_varchar_limit)
                            update_dataset_varchar_limit(self.project, synced_dataset_name,
                                                         self.main_connection_varchar_limit)
                    else:
                        downstream_project_recipe_settings.replace_input(synced_dataset_name,
                                                                         fallback_connection_dataset)
                    downstream_project_recipe_settings.save()
                    pass
                pass
            pass
        pass

    def connect_flow_input_datasets(self, datasets_to_tables_or_paths_mapping, input_datasets_read_file_format=None):
        """
        Connects all flow input datasets to the tables or paths where to find their data.

        :param datasets_to_tables_or_paths_mapping: dict: Mapping between project dataset names and the table/path of
            their datasource, in the 'main_connection'.
            Examples:
                - {'input_dataset_1': 'table_1', 'input_dataset_2': 'table_2'}
                - {'input_dataset_1': 'path/to/input_dataset_1_data', 'input_dataset_2': 'path/to/input_dataset_2_data'}

        :param input_datasets_read_file_format: str: File format of the input datasets, with a value in
            'ALLOWED_FILESYSTEM_STORAGES_FILE_FORMATS'.
        """

        if input_datasets_read_file_format is None:
            input_datasets_read_file_format = self.DEFAULT_FILESYSTEM_STORAGES_FILE_FORMAT
        print("Ingesting flow datasources ...")
        for dataset_name in self.datasets_that_should_be_not_managed:
            if dataset_name in datasets_to_tables_or_paths_mapping.keys():
                table_or_path_associated_with_dataset = datasets_to_tables_or_paths_mapping[dataset_name]
                if len(table_or_path_associated_with_dataset) > 0:
                    if self.main_connection_type in self.ALL_ALLOWED_SQL_STORAGES:
                        change_sql_dataset_table(self.project, dataset_name, table_or_path_associated_with_dataset)
                        try:
                            autodetect_sql_dataset_schema(self.project, dataset_name)
                        except:
                            log_message = "Please check the syntax of the table associated to dataset'{}'. "\
                                .format(dataset_name)
                            log_message += "\nGet name '{}' that seems to not exist in your connection)."\
                                .format(table_or_path_associated_with_dataset)
                            raise ValueError(log_message)

                    elif self.main_connection_type in self.ALL_ALLOWED_FILESYSTEM_STORAGES:
                        change_filesystem_dataset_path(self.project, dataset_name,
                                                       table_or_path_associated_with_dataset)
                        change_filesystem_dataset_format(project=self.project,
                                                         dataset_name=dataset_name,
                                                         new_dataset_format=input_datasets_read_file_format)
                        try:
                            infer_and_update_dataset_schema(self.project, dataset_name, self.main_connection_name)
                        except:
                            log_message = "Please check the syntax of the path associated to dataset '{}'. "\
                                .format(dataset_name)
                            log_message += "\nGet name '{}' that seems to not exist in your connection)."\
                                .format(table_or_path_associated_with_dataset)
                            raise ValueError(log_message)

                else:
                    log_message = "Please fill the name of the table/path associated to dataset'{}': "\
                                  "It is currently empty".format(dataset_name)

                    raise ValueError(log_message)
        print("Flow input datasets ingested !")
        pass

    def connect_flow_input_folders(self, folders_names_to_paths_mapping):
        """
        Connects all flow input folders to the paths where to find their data.

        :param folders_names_to_paths_mapping: dict: Mapping between project folder names and the paths of their
            datasource, in the 'folders_connection_name'.
            Example: {'input_folder_1': 'path/to/input_folder_1_data', 'input_folder_2': 'path/to/input_folder_2_data'}
        """
        for folder_name in folders_names_to_paths_mapping.keys():
            folder_path = folders_names_to_paths_mapping[folder_name]
            if len(folder_path) > 0:
                change_folder_path(self.project, folder_name, folder_path)
            else:
                log_message = "Please fill the name of the path associated to folder'{}': "\
                              "It is currently empty".format(folder_name)
                raise ValueError(log_message)

        print("Flow input folders ingested !")
        pass
    pass