"""
Shared state module for Gradio hot-reload compatibility.

This module holds all global state (models, processor, chapters) in a singleton
pattern that survives Gradio's module reloading. By keeping state here instead
of in app.py, we avoid re-initialization on every code change.
"""

from dataclasses import dataclass, field
from typing import Any, Optional


@dataclass
class AppState:
    """Container for all application state."""
    processor: Optional[Any] = None
    model: Optional[Any] = None
    chapters: Optional[list] = None
    model_bundles: list = field(default_factory=list)
    initialized: bool = False
    # Cache for RecitationResult with duration data from audio processing
    last_recitation_result: Optional[Any] = None
    last_recitation_verse_ref: Optional[str] = None
    # Cache for segment mode: List[RecitationResult] with duration data
    last_segment_results: Optional[list] = None
    last_segment_refs: Optional[list] = None
    # Cache for error analysis segment HTML (for re-rendering with sort modes)
    last_error_segment_data: Optional[list] = None
    # Cache for multi-model mode: {idx: RecitationResult} or {idx: List[RecitationResult]}
    last_multi_model_results: Optional[dict] = None  # Non-segmented
    last_multi_model_segment_results: Optional[dict] = None  # Segmented
    last_multi_model_segment_refs: Optional[dict] = None
    last_multi_model_verse_ref: Optional[str] = None


# Singleton instance - survives module reloads
_state = AppState()


def get_state() -> AppState:
    """Get the shared application state."""
    return _state


def is_initialized() -> bool:
    """Check if app has been initialized."""
    return _state.initialized


def set_initialized(value: bool = True) -> None:
    """Mark app as initialized."""
    _state.initialized = value


def get_processor():
    """Get the processor."""
    return _state.processor


def set_processor(processor):
    """Set the processor."""
    _state.processor = processor


def get_model():
    """Get the model."""
    return _state.model


def set_model(model):
    """Set the model."""
    _state.model = model


def get_chapters():
    """Get the chapters list."""
    return _state.chapters


def set_chapters(chapters):
    """Set the chapters list."""
    _state.chapters = chapters


def get_model_bundles():
    """Get the model bundles list."""
    return _state.model_bundles


def set_model_bundles(bundles):
    """Set the model bundles list."""
    _state.model_bundles = bundles


def get_last_recitation_result():
    """Get the cached RecitationResult from last audio processing."""
    return _state.last_recitation_result, _state.last_recitation_verse_ref


def set_last_recitation_result(result, verse_ref: str):
    """Cache a RecitationResult with duration data for ghunnah/madd tabs."""
    _state.last_recitation_result = result
    _state.last_recitation_verse_ref = verse_ref


def get_last_segment_results():
    """Get the cached segment results from last segmented audio processing."""
    return _state.last_segment_results, _state.last_segment_refs


def set_last_segment_results(results: list, segment_refs: list):
    """Cache segment RecitationResults with duration data for ghunnah/madd tabs."""
    _state.last_segment_results = results
    _state.last_segment_refs = segment_refs


def clear_segment_results():
    """Clear segment results cache (called when switching to non-segment mode)."""
    _state.last_segment_results = None
    _state.last_segment_refs = None


def get_last_error_segment_data():
    """Get cached error analysis segment data for re-rendering."""
    return _state.last_error_segment_data


def set_last_error_segment_data(data: list):
    """Cache error analysis segment data for re-rendering with sort modes."""
    _state.last_error_segment_data = data


def clear_error_segment_data():
    """Clear error segment data cache."""
    _state.last_error_segment_data = None


def get_last_multi_model_results():
    """Get cached multi-model results (non-segmented mode)."""
    return _state.last_multi_model_results, _state.last_multi_model_verse_ref


def set_last_multi_model_results(results: dict, verse_ref: str):
    """Cache multi-model RecitationResults for ghunnah/madd tabs (non-segmented)."""
    _state.last_multi_model_results = results
    _state.last_multi_model_verse_ref = verse_ref
    # Clear segmented multi-model cache when setting non-segmented
    _state.last_multi_model_segment_results = None
    _state.last_multi_model_segment_refs = None


def get_last_multi_model_segment_results():
    """Get cached multi-model segment results (segmented mode)."""
    return (
        _state.last_multi_model_segment_results,
        _state.last_multi_model_segment_refs,
        _state.last_multi_model_verse_ref,
    )


def set_last_multi_model_segment_results(results: dict, refs: dict, verse_ref: str):
    """Cache multi-model segment results for ghunnah/madd tabs (segmented)."""
    _state.last_multi_model_segment_results = results
    _state.last_multi_model_segment_refs = refs
    _state.last_multi_model_verse_ref = verse_ref
    # Clear non-segmented multi-model cache when setting segmented
    _state.last_multi_model_results = None


def clear_multi_model_results():
    """Clear all multi-model caches."""
    _state.last_multi_model_results = None
    _state.last_multi_model_segment_results = None
    _state.last_multi_model_segment_refs = None
    _state.last_multi_model_verse_ref = None


def clear_all_audio_caches():
    """Clear all audio-related caches (segment results + reference audio)."""
    clear_segment_results()
    clear_error_segment_data()
    clear_multi_model_results()
    set_last_recitation_result(None, None)
    from recitation_engine.reference_audio import clear_audio_caches
    clear_audio_caches()


def reset_state():
    """Reset all state (for testing or forced re-init)."""
    global _state
    _state = AppState()


def recompute_errors_for_result(result):
    """
    Re-run error detection on a cached RecitationResult.

    Used when settings change (e.g., iqlab/ikhfaa sound) to update
    error detection without re-running transcription.

    Re-phonemizes to get fresh canonical phonemes that reflect current settings,
    then re-runs error detection against the original detected phonemes.

    Args:
        result: RecitationResult with duration data

    Returns:
        New RecitationResult with updated errors but preserved duration data
    """
    if result is None:
        return None

    from recitation_analysis.error_analysis import ErrorPipeline
    from recitation_analysis.result import RecitationResult
    from recitation_analysis.result_builder import get_result_builder
    from utils.phonemizer_utils import get_cached_phonemizer_result

    # Re-phonemize to get fresh canonical phonemes with current settings
    # This is critical: when ikhfaa/iqlab setting changes, the canonical phonemes change
    # Use segment_ref if available (contains word-range ref for this segment), otherwise verse_ref
    ref_to_use = result.segment_ref or result.verse_ref
    phonemizer_result = get_cached_phonemizer_result(ref_to_use, ["compulsory_stop"])
    if phonemizer_result is None:
        # Can't re-phonemize, return original result unchanged
        return result

    # Build fresh base result with NEW canonical phonemes
    builder = get_result_builder()
    fresh_result = builder.build_from_phonemizer_result(
        phonemizer_result,
        verse_ref=result.verse_ref,
        segment_ref=result.segment_ref,
    )

    # Re-run error detection with FRESH canonical phonemes vs OLD detected phonemes
    pipeline = ErrorPipeline()
    new_result = pipeline.detect_errors(fresh_result, list(result.detected_phonemes))

    # Copy over duration fields that aren't set by detect_errors
    updated_result = RecitationResult(
        verse_ref=new_result.verse_ref,
        segment_ref=new_result.segment_ref,
        canonical_phonemes=new_result.canonical_phonemes,
        detected_phonemes=new_result.detected_phonemes,
        canonical_words=new_result.canonical_words,
        detected_words=new_result.detected_words,
        alignment=new_result.alignment,
        madd_mappings=new_result.madd_mappings,
        phoneme_alignment=new_result.phoneme_alignment,
        errors=new_result.errors,
        ghunnah_instances=new_result.ghunnah_instances,
        madd_instances=new_result.madd_instances,
        # Preserve duration data from original
        fa_segments=result.fa_segments,
        cvc_avg_duration_ms=result.cvc_avg_duration_ms,
        cvc_instance_count=result.cvc_instance_count,
        fa_visualization_data=result.fa_visualization_data,
        user_audio_clip=result.user_audio_clip,
    )

    # Recompute durations on new instances using preserved FA data
    # This is needed because detect_errors() creates new instances without duration_ms
    if result.fa_segments and updated_result.phoneme_alignment:
        from recitation_analysis.duration_analysis.duration_calculator import (
            build_canonical_to_decoded_map,
            compute_instance_durations,
        )

        # Rebuild mapping from new alignment (uses new canonical phonemes after setting change)
        canonical_to_decoded = build_canonical_to_decoded_map(updated_result.phoneme_alignment)

        # Recompute durations for ghunnah instances
        if updated_result.ghunnah_instances:
            compute_instance_durations(
                instances=updated_result.ghunnah_instances,
                canonical_phonemes=updated_result.canonical_phonemes,
                decoded_phonemes=updated_result.detected_phonemes,
                fa_segments=result.fa_segments,
                canonical_to_decoded=canonical_to_decoded,
            )

        # Recompute durations for madd instances
        if updated_result.madd_instances:
            compute_instance_durations(
                instances=updated_result.madd_instances,
                canonical_phonemes=updated_result.canonical_phonemes,
                decoded_phonemes=updated_result.detected_phonemes,
                fa_segments=result.fa_segments,
                canonical_to_decoded=canonical_to_decoded,
            )

    return updated_result