"""
Pipeline Factory - Registry-based pipeline selection.
"""

from typing import Callable, List, Tuple

from src.config import get_config_value
from src.pipelines.base import ContentAutomationBase


# Registry: List of (condition_fn, pipeline_class) tuples in priority order
_PIPELINE_REGISTRY: List[Tuple[Callable[[], bool], type]] = []


def register_pipeline(condition: Callable[[], bool], priority: int = 0):
    """Decorator to register a pipeline with its activation condition."""
    def decorator(cls):
        _PIPELINE_REGISTRY.append((priority, condition, cls))
        _PIPELINE_REGISTRY.sort(key=lambda x: x[0], reverse=True)  # Higher priority first
        return cls
    return decorator


def _init_registry():
    """Initialize the pipeline registry with default pipelines."""
    from src.pipelines.standard_ai_pipeline import StandardAIPipeline
    from src.pipelines.avatar_ai_pipeline import AvatarAIPipeline
    from src.pipelines.hard_cut_pipeline import HardCutPipeline
    from src.pipelines.beats_cut_pipeline import BeatsCutPipeline
    from src.pipelines.voiceover_ai_pipeline import VoiceOverAIPipeline
    
    global _PIPELINE_REGISTRY
    _PIPELINE_REGISTRY = [
        # (priority, condition, pipeline_class)
        (100, lambda: get_config_value("SETUP_TYPE", "") == "vo_video_gen", VoiceOverAIPipeline),
        (50, lambda: get_config_value("video_merge_type") == "hard_cut", HardCutPipeline),
        (50, lambda: get_config_value("video_merge_type") == "beats_cut", BeatsCutPipeline),
        (10, lambda: get_config_value("is_a2e_lip_sync", False), AvatarAIPipeline),
        (0, lambda: True, StandardAIPipeline),  # Default fallback
    ]


def get_automation_pipeline() -> ContentAutomationBase:
    """
    Factory function to return the appropriate automation pipeline.
    
    Uses priority-ordered registry to find the first matching pipeline.
    """
    # Lazy init registry
    if not _PIPELINE_REGISTRY:
        _init_registry()
    
    for priority, condition, pipeline_class in _PIPELINE_REGISTRY:
        if condition():
            return pipeline_class()
    
    # Should never reach here due to default fallback
    from src.pipelines.standard_ai_pipeline import StandardAIPipeline
    return StandardAIPipeline()