"""
Look and Tell Referential Dataset Loader

Example script for loading and using the dataset.
"""

from pathlib import Path
import pandas as pd
import json
import cv2
from typing import Dict, Any, Optional


class ARIAReferentialDataset:
    """
    Loader for KTH-ARIA Referential Dataset
    
    Example usage:
        dataset = ARIAReferentialDataset('data')
        recording = dataset.load_recording('par_01', 'rec_01')
    """
    
    def __init__(self, data_path: str):
        self.data_path = Path(data_path)
        self.metadata = self._load_metadata()
        self.recipes = self._load_recipes()
        
    def _load_metadata(self) -> pd.DataFrame:
        """Load dataset metadata"""
        metadata_path = self.data_path / 'manifests' / 'metadata.parquet'
        if metadata_path.exists():
            return pd.read_parquet(metadata_path)
        else:
            # Fallback to CSV
            csv_path = self.data_path / 'manifests' / 'metadata.csv'
            return pd.read_csv(csv_path)
    
    def _load_recipes(self) -> Dict:
        """Load recipe information"""
        recipe_path = self.data_path / 'manifests' / 'recipes.json'
        with open(recipe_path) as f:
            return json.load(f)
    
    def get_recording_info(self, participant_id: str, recording_id: str) -> Dict[str, Any]:
        """Get metadata for a specific recording"""
        recording_uid = f"{participant_id}_{recording_id}"
        row = self.metadata[self.metadata['recording_uid'] == recording_uid]
        
        if len(row) == 0:
            raise ValueError(f"Recording {recording_uid} not found")
        
        return row.iloc[0].to_dict()
    
    def load_recording(self, participant_id: str, recording_id: str) -> Dict[str, Any]:
        """
        Load all data for a recording
        
        Returns:
            Dictionary containing:
                - ego_video_path: Path to egocentric video
                - exo_video_path: Path to exocentric video
                - audio_path: Path to audio
                - gaze: Gaze tracking dataframe
                - references: Reference annotations dataframe
                - transcription: ASR transcription dataframe
                - recipe: Recipe information
                - metadata: Recording metadata
        """
        # Get paths
        raw_path = self.data_path / participant_id / 'raw' / recording_id
        ann_path = self.data_path / participant_id / 'annotations' / 'v1' / recording_id
        
        # Get metadata
        info = self.get_recording_info(participant_id, recording_id)
        
        # Derive recipe_id from recording_num (recording_num 1 -> recipe_01, etc.)
        recipe_id = f"recipe_{int(info['recording_num']):02d}"
        
        # Load data
        result = {
            'ego_video_path': str(raw_path / 'ego_video.mp4'),
            'exo_video_path': str(raw_path / 'exo_video.mp4'),
            'audio_path': str(raw_path / 'audio.wav'),
            'metadata': info,
            'recipe': self.recipes.get(recipe_id),
        }
        
        # Load gaze data if available
        gaze_path = raw_path / 'ego_gaze.csv'
        if gaze_path.exists():
            result['gaze'] = pd.read_csv(gaze_path)
        
        # Load annotations if available
        ref_path = ann_path / 'references.csv'
        if ref_path.exists():
            result['references'] = pd.read_csv(ref_path)
        
        trans_path = ann_path / 'whisperx_transcription.tsv'
        if trans_path.exists():
            result['transcription'] = pd.read_csv(trans_path, sep='\t')
        
        return result
    
    def get_recordings_by_recipe(self, recipe_id: str) -> pd.DataFrame:
        """Get all recordings for a specific recipe
        
        Args:
            recipe_id: Recipe ID string (e.g., 'recipe_01', 'recipe_02', etc.)
        """
        # Extract recipe number from recipe_id (e.g., 'recipe_01' -> 1)
        recipe_num = int(recipe_id.split('_')[1])
        return self.metadata[self.metadata['recording_num'] == recipe_num]
    
    def get_participant_recordings(self, participant_id: str) -> pd.DataFrame:
        """Get all recordings for a specific participant"""
        return self.metadata[self.metadata['participant_id'] == participant_id]


# Example usage
if __name__ == "__main__":
    # Initialize dataset
    dataset = ARIAReferentialDataset('data')
    
    # Print dataset summary
    print(f"Total recordings: {len(dataset.metadata)}")
    print(f"Participants: {dataset.metadata['participant_id'].nunique()}")
    print(f"Recipes: {len(dataset.recipes) - 1}")  # -1 for surface_map
    print()
    
    # Load a specific recording
    print("Loading par_01, rec_01...")
    recording = dataset.load_recording('par_01', 'rec_01')
    
    print(f"Recipe: {recording['recipe']['name']}")
    print(f"Duration: {recording['metadata']['duration_sec']:.1f}s")
    print(f"Has gaze: {recording['metadata']['has_gaze']}")
    print(f"References: {recording['metadata']['n_references']}")
    print()
    
    # Get all recordings for recipe 1
    recipe_1 = dataset.get_recordings_by_recipe('recipe_01')
    print(f"Recipe 1 performed by {len(recipe_1)} participants")