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# setup_utilities.py

## High-level description

The `setup_utilities.py` file provides utility functions for setting up and configuring the Cassiopeia preprocessing pipeline. It handles tasks such as parsing configuration files, creating output directories, and defining the sequence of preprocessing stages.

## Code Structure

The `setup_utilities.py` file contains three main functions: `setup`, `parse_config`, and `create_pipeline`. The `setup` function initializes the output directory and logging. The `parse_config` function reads and parses the configuration file, setting default values and validating required parameters. The `create_pipeline` function determines the order of preprocessing stages based on the specified entry and exit points.

## References

This code references the following symbols:

* `cassiopeia.preprocess.constants.DEFAULT_PIPELINE_PARAMETERS`: A dictionary containing default parameters for each stage of the preprocessing pipeline.
* `cassiopeia.mixins.UnspecifiedConfigParameterError`: An exception raised when a required configuration parameter is not specified.
* `cassiopeia.preprocess.cassiopeia_preprocess.STAGES`: A dictionary mapping stage names to their corresponding functions in the preprocessing pipeline.

## Symbols

### `setup`

#### Description

Sets up the environment for the preprocessing pipeline by creating the output directory and configuring logging.

#### Inputs

| Name                        | Type | Description                        |
| :-------------------------- | :--- | :--------------------------------- |
| output\_directory\_location | str  | The path to the output directory.  |
| verbose                     | bool | Whether to enable verbose logging. |

#### Side Effects

* Creates the output directory if it doesn't exist.
* Adds a file handler to the logger, writing logs to `preprocess.log` and `preprocess.err` files in the output directory.

### `parse_config`

#### Description

Parses the configuration file for the preprocessing pipeline, setting default values and validating required parameters.

#### Inputs

| Name           | Type | Description                                 |
| :------------- | :--- | :------------------------------------------ |
| config\_string | str  | The configuration file content as a string. |

#### Outputs

| Name       | Type                        | Description                                                      |
| :--------- | :-------------------------- | :--------------------------------------------------------------- |
| parameters | Dict\[str, Dict\[str, Any]] | A dictionary containing parameters for each preprocessing stage. |

#### Internal Logic

1. Reads the default pipeline parameters from `constants.DEFAULT_PIPELINE_PARAMETERS`.
2. Parses the provided `config_string` using the `configparser` module.
3. Updates the default parameters with values from the parsed configuration.
4. Validates that required parameters are present in the `general` section of the configuration.
5. Adds necessary parameters from the `general` section to other stages.
6. Returns the parsed and validated parameters.

#### Error Handling

Raises an `UnspecifiedConfigParameterError` if any required parameter is missing from the configuration.

### `create_pipeline`

#### Description

Creates a list of preprocessing stages to be executed based on the specified entry and exit points.

#### Inputs

| Name   | Type            | Description                                                        |
| :----- | :-------------- | :----------------------------------------------------------------- |
| entry  | str             | The name of the stage to start the pipeline from.                  |
| \_exit | str             | The name of the stage to stop the pipeline at.                     |
| stages | Dict\[str, Any] | A dictionary mapping stage names to their corresponding functions. |

#### Outputs

| Name             | Type       | Description                                    |
| :--------------- | :--------- | :--------------------------------------------- |
| pipeline\_stages | List\[str] | A list of stage names to be executed in order. |

#### Internal Logic

1. Gets a list of stage names from the `stages` dictionary.
2. Finds the indices of the `entry` and `_exit` stages in the list.
3. Returns a slice of the list from the `entry` index to the `_exit` index (inclusive).