#!/usr/bin/env python3
"""Tutorial: Effects Processing

This module demonstrates AudioUnit effects processing with coremusic.
All examples are executable doctests.

Run with: pytest tests/tutorials/test_effects_processing.py --doctest-modules -v
"""

from __future__ import annotations


def list_available_audio_units():
    """List all available AudioUnits.

    >>> from coremusic.audio.utilities import list_available_audio_units
    >>> units = list_available_audio_units()
    >>> assert isinstance(units, list)
    >>> assert len(units) > 0  # macOS has built-in AudioUnits
    >>> # Each unit should have name and type
    >>> unit = units[0]
    >>> assert 'name' in unit
    >>> assert 'type' in unit
    """
    pass


def get_effect_names():
    """Get names of effect AudioUnits only.

    >>> from coremusic.audio.utilities import get_audiounit_names
    >>> effects = get_audiounit_names(filter_type='aufx')
    >>> assert isinstance(effects, list)
    >>> # macOS includes built-in effects like AUDelay, AUReverb2
    >>> # Check for at least one effect
    >>> assert len(effects) > 0
    """
    pass


def get_instrument_names():
    """Get names of instrument AudioUnits.

    >>> from coremusic.audio.utilities import get_audiounit_names
    >>> instruments = get_audiounit_names(filter_type='aumu')
    >>> assert isinstance(instruments, list)
    >>> # macOS includes DLSMusicDevice
    >>> assert len(instruments) >= 0  # May be 0 if no instruments installed
    """
    pass


def find_audio_unit_by_name():
    """Find an AudioUnit by name.

    >>> from coremusic.audio.utilities import find_audio_unit_by_name
    >>> # AUDelay is a built-in macOS effect
    >>> component = find_audio_unit_by_name("AUDelay")
    >>> assert component is not None
    """
    pass


def find_audio_unit_partial_match():
    """Find AudioUnit with partial name match.

    >>> from coremusic.audio.utilities import find_audio_unit_by_name
    >>> # Search for "Reverb" should find AUReverb2
    >>> component = find_audio_unit_by_name("Reverb")
    >>> assert component is not None
    """
    pass


def audio_unit_types():
    """Understand AudioUnit type codes.

    AudioUnit types are 4-character codes:
    - 'aufx' = Effect (reverb, delay, EQ, compressor)
    - 'aumu' = Music Device/Instrument (synthesizer, sampler)
    - 'augn' = Generator (test tone, noise)
    - 'aumx' = Mixer
    - 'aufc' = Format Converter
    - 'auou' = Output Unit

    >>> AUDIOUNIT_TYPES = {
    ...     'aufx': 'Effect',
    ...     'aumu': 'Instrument',
    ...     'augn': 'Generator',
    ...     'aumx': 'Mixer',
    ...     'aufc': 'Format Converter',
    ...     'auou': 'Output Unit',
    ... }
    >>> assert AUDIOUNIT_TYPES['aufx'] == 'Effect'
    >>> assert AUDIOUNIT_TYPES['aumu'] == 'Instrument'
    """
    pass


def create_audio_component_description():
    """Create an AudioComponentDescription.

    >>> from coremusic.audio import AudioComponentDescription
    >>> # Create description for Apple's Delay effect
    >>> desc = AudioComponentDescription(
    ...     type='aufx',        # Effect
    ...     subtype='dely',     # Delay
    ...     manufacturer='appl' # Apple
    ... )
    >>> assert desc is not None
    """
    pass


def find_component_by_description():
    """Find AudioComponent using description.

    The preferred way is to use find_audio_unit_by_name or
    list_available_audio_units.

    >>> from coremusic.audio.utilities import find_audio_unit_by_name
    >>> # Find Apple's Reverb effect by name
    >>> component = find_audio_unit_by_name("AUReverb2")
    >>> assert component is not None
    """
    pass


def create_effects_chain():
    """Create an audio effects chain.

    >>> from coremusic.audio.utilities import AudioEffectsChain
    >>> chain = AudioEffectsChain()
    >>> assert chain is not None
    >>> chain.dispose()
    """
    pass


def add_effect_to_chain_by_name():
    """Add an effect to a chain by name.

    >>> from coremusic.audio.utilities import AudioEffectsChain
    >>> chain = AudioEffectsChain()
    >>> try:
    ...     # Add delay effect
    ...     delay_node = chain.add_effect_by_name("AUDelay")
    ...     assert delay_node is not None
    ... finally:
    ...     chain.dispose()
    """
    pass


def add_effect_to_chain_by_descriptor():
    """Add an effect to a chain using type/subtype/manufacturer.

    >>> from coremusic.audio.utilities import AudioEffectsChain
    >>> chain = AudioEffectsChain()
    >>> try:
    ...     # Add Apple's Reverb
    ...     reverb_node = chain.add_effect("aufx", "rvb2", "appl")
    ...     assert reverb_node is not None
    ... finally:
    ...     chain.dispose()
    """
    pass


def add_output_to_chain():
    """Add an output node to a chain.

    >>> from coremusic.audio.utilities import AudioEffectsChain
    >>> chain = AudioEffectsChain()
    >>> try:
    ...     output_node = chain.add_output()
    ...     assert output_node is not None
    ... finally:
    ...     chain.dispose()
    """
    pass


def connect_chain_nodes():
    """Connect nodes in an effects chain.

    >>> from coremusic.audio.utilities import AudioEffectsChain
    >>> chain = AudioEffectsChain()
    >>> try:
    ...     # Add effect and output
    ...     delay = chain.add_effect_by_name("AUDelay")
    ...     output = chain.add_output()
    ...     # Connect: delay -> output
    ...     chain.connect(delay, output)
    ... finally:
    ...     chain.dispose()
    """
    pass


def create_multi_effect_chain():
    """Create a chain with multiple effects in series.

    >>> from coremusic.audio.utilities import AudioEffectsChain
    >>> chain = AudioEffectsChain()
    >>> try:
    ...     # Add effects: EQ -> Delay -> Reverb -> Output
    ...     eq = chain.add_effect_by_name("AUParametricEQ")
    ...     delay = chain.add_effect_by_name("AUDelay")
    ...     reverb = chain.add_effect_by_name("AUReverb2")
    ...     output = chain.add_output()
    ...     # Connect in series
    ...     if eq and delay:
    ...         chain.connect(eq, delay)
    ...     if delay and reverb:
    ...         chain.connect(delay, reverb)
    ...     if reverb and output:
    ...         chain.connect(reverb, output)
    ... finally:
    ...     chain.dispose()
    """
    pass


def initialize_effects_chain():
    """Initialize an effects chain for processing.

    >>> from coremusic.audio.utilities import AudioEffectsChain
    >>> chain = AudioEffectsChain()
    >>> reverb = chain.add_effect_by_name("AUReverb2")
    >>> output = chain.add_output()
    >>> _ = chain.connect(reverb, output)
    >>> _ = chain.open()
    >>> _ = chain.initialize()
    >>> chain.dispose()
    """
    pass


def common_apple_effects():
    """Reference of common Apple AudioUnit effects.

    >>> APPLE_EFFECTS = {
    ...     # Delay effects
    ...     'AUDelay': ('aufx', 'dely', 'appl'),
    ...     'AUSampleDelay': ('aufx', 'sdly', 'appl'),
    ...     # Reverb effects
    ...     'AUReverb2': ('aufx', 'rvb2', 'appl'),
    ...     'AUMatrixReverb': ('aufx', 'mrev', 'appl'),
    ...     # Dynamics
    ...     'AUDynamicsProcessor': ('aufx', 'dcmp', 'appl'),
    ...     'AUPeakLimiter': ('aufx', 'lmtr', 'appl'),
    ...     'AUMultibandCompressor': ('aufx', 'mcmp', 'appl'),
    ...     # EQ
    ...     'AUParametricEQ': ('aufx', 'pmeq', 'appl'),
    ...     'AUNBandEQ': ('aufx', 'nbeq', 'appl'),
    ...     'AUGraphicEQ': ('aufx', 'greq', 'appl'),
    ...     'AUFilter': ('aufx', 'filt', 'appl'),
    ...     'AUHighShelfFilter': ('aufx', 'hshf', 'appl'),
    ...     'AULowShelfFilter': ('aufx', 'lshf', 'appl'),
    ...     'AULowPassFilter': ('aufx', 'lpas', 'appl'),
    ...     'AUHighPassFilter': ('aufx', 'hpas', 'appl'),
    ...     'AUBandPassFilter': ('aufx', 'bpas', 'appl'),
    ...     # Distortion
    ...     'AUDistortion': ('aufx', 'dist', 'appl'),
    ...     # Pitch
    ...     'AUPitch': ('aufx', 'tmpt', 'appl'),
    ...     'AURoundTripAAC': ('aufx', 'raac', 'appl'),
    ...     # Other
    ...     'AUNetSend': ('aufx', 'nsnd', 'appl'),
    ...     'AURogerBeep': ('aufx', 'rogr', 'appl'),
    ... }

    >>> # Verify structure
    >>> for name, (type_, subtype, manu) in APPLE_EFFECTS.items():
    ...     assert len(type_) == 4
    ...     assert len(subtype) == 4
    ...     assert len(manu) == 4
    """
    pass


def calculate_tempo_synced_delay():
    """Calculate delay time synced to tempo.

    >>> def tempo_to_delay_ms(bpm, note_value):
    ...     '''Calculate delay time in milliseconds for a note value at given tempo.'''
    ...     beat_ms = 60000.0 / bpm  # One beat in ms
    ...     note_values = {
    ...         '1/1': 4.0,      # Whole note
    ...         '1/2': 2.0,      # Half note
    ...         '1/4': 1.0,      # Quarter note
    ...         '1/8': 0.5,      # Eighth note
    ...         '1/16': 0.25,    # Sixteenth note
    ...         '1/8T': 1/3,     # Eighth triplet
    ...         '1/4D': 1.5,     # Dotted quarter
    ...     }
    ...     multiplier = note_values.get(note_value, 1.0)
    ...     return beat_ms * multiplier

    >>> # At 120 BPM
    >>> tempo_to_delay_ms(120, '1/4')  # Quarter note
    500.0
    >>> tempo_to_delay_ms(120, '1/8')  # Eighth note
    250.0
    >>> tempo_to_delay_ms(120, '1/16')  # Sixteenth note
    125.0
    >>> # At 140 BPM
    >>> round(tempo_to_delay_ms(140, '1/4'), 2)  # Quarter note
    428.57
    """
    pass


# Test runner
if __name__ == "__main__":
    import doctest

    doctest.testmod(verbose=True)
