"""Transcoding rule designer util module."""

from typing import Any

from transcoding.constants import adapters, transcoding


def construct_rules(
    transcoding_rules: list[dict[str, Any]],
    source_asset_metadata: dict[str, Any],
) -> list[dict[str, Any]]:
    """Construct rules for transcoding job design.

    Note:
        Input transcoding rules model contain keys which are not appropriate
        for creating of a transcoding job. Transcoding rule entries have
        a prefix 'output_' for job configuration therefore we remove this
        prefix for rules from DB.
    Args:
        transcoding_rules (list): Rules derived from models or request body.
        source_asset_metadata (dict): Metadata of source asset from mediainfo
            extractor.
    Returns:
       list: return list of rules for transcoding job design.
    """
    result_list = []
    for rule in transcoding_rules:
        result_rule = {}
        audio_metadata = source_asset_metadata
        container = rule.get("container") or rule.get("output_container")
        if container in adapters.ADAPTERS_MAPPING:
            audio_metadata = adapters.ADAPTERS_MAPPING[container](audio_metadata)
        for key, value in rule.items():
            pure_key = key.removeprefix("output_")  # in model we have a prefix input
            if pure_key in transcoding.CONSTRUCTOR_TRANSCODING_RULE_FIELDS:
                result_rule[pure_key] = value or audio_metadata.get(pure_key)
        result_list.append(result_rule)

    return result_list