from dataclasses import dataclass, field
from typing import List, Dict, Optional, Any
import json
import re
from pathlib import Path
from pipeline_config import PipelineConfig

@dataclass
class TaskmasterDialogue:
    """
    Structured representation of a Taskmaster dialogue
    """
    conversation_id: str
    instruction_id: Optional[str]
    scenario: Optional[str]
    domain: Optional[str]
    turns: List[Dict[str, Any]]
    original_metadata: Dict[str, Any] = field(default_factory=dict)
    
    def __str__(self):
        return f"TaskmasterDialogue(conversation_id={self.conversation_id}, turns={len(self.turns)} turns)"
    
    def validate(self) -> bool:
        return bool(self.conversation_id and isinstance(self.turns, list))

class TaskmasterProcessor:
    """
    Handles processing and preparation of Taskmaster dataset dialogues
    """
    config: PipelineConfig
    use_ontology: bool = False  # Whether to load and use ontology
    ontology: Optional[Dict[str, Any]] = None  # Holds ontology data if loaded
    domains: set = field(default_factory=set)  # Tracks unique domains
    scenarios: set = field(default_factory=set)  # Tracks unique scenarios
    
    def __init__(self, config: PipelineConfig, use_ontology: bool = False):
        self.config = config
        self.use_ontology = use_ontology
        self.ontology = None
        self.domains = set()
        self.scenarios = set()
        
    def load_dataset(self, base_dir: str, max_examples: Optional[int] = None) -> List[TaskmasterDialogue]:
        """
        Load and parse Taskmaster JSON dataset.
        Handles self-dialogs, woz-dialogs, and ontology files.
        """
        required_files = {
            "self-dialogs": "self-dialogs.json",
            "woz-dialogs": "woz-dialogs.json",
            "ontology": "ontology.json",
        }
        
        # Check for required files
        missing_files = [name for name, path in required_files.items() if not Path(base_dir, path).exists()]
        if missing_files:
            raise FileNotFoundError(f"Missing required taskmaster files: {missing_files}")
        
        # load ontology
        ontology_path = Path(base_dir, required_files['ontology'])
        with open(ontology_path, 'r', encoding='utf-8') as f:
            self.ontology = json.load(f)
            
        processed_dialogues = []
        for file_key in ["self-dialogs", "woz-dialogs"]:
            file_path = Path(base_dir, required_files[file_key])
            with open(file_path, 'r', encoding='utf-8') as f:
                raw_data = json.load(f)
            
            for dialogue in raw_data:
                # Extract core dialogue components
                conversation_id = dialogue.get('conversation_id', '')
                instruction_id = dialogue.get('instruction_id', None)
                
                if 'utterances' in dialogue:
                    turns = self._process_utterances(dialogue['utterances'])
                    scenario = dialogue.get('scenario', '')
                    domain = self._extract_domain(scenario)
                else:
                    turns = []
                    scenario = ''
                    domain = ''
                
                # Store metadata
                metadata = {k: v for k, v in dialogue.items() 
                            if k not in {'conversation_id', 'instruction_id', 'utterances'}}
                
                # Create structured dialogue object
                processed_dialogue = TaskmasterDialogue(
                    conversation_id=conversation_id,
                    instruction_id=instruction_id,
                    scenario=scenario,
                    domain=domain,
                    turns=turns,
                    original_metadata=metadata
                )
                
                processed_dialogues.append(processed_dialogue)
                
                # Update domain and scenario tracking
                if domain:
                    self.domains.add(domain)
                if scenario:
                    self.scenarios.add(scenario)
                    
                if max_examples and len(processed_dialogues) >= max_examples:
                    break
        
        return processed_dialogues
    
    def _process_utterances(self, utterances: List[Dict]) -> List[Dict]:
        """
        Process utterances into a standardized format
        """
        processed_turns = []
        
        for utterance in utterances:
            # Map Taskmaster speaker roles to your expected format
            speaker = 'assistant' if utterance.get('speaker') == 'ASSISTANT' else 'user'
            
            # Extract and clean the text
            text = utterance.get('text', '').strip()
            
            # Extract any segments or annotations if present
            segments = utterance.get('segments', [])
            
            # Create the processed turn
            turn = {
                'speaker': speaker,
                'text': text,
                'original_speaker': utterance.get('speaker', ''),
                'segments': segments,
                'metadata': {k: v for k, v in utterance.items() 
                           if k not in {'speaker', 'text', 'segments'}}
            }
            
            processed_turns.append(turn)
        
        return processed_turns
    
    def _extract_domain(self, scenario: str) -> str:
        """
        Extract domain from scenario description
        """
        domain_patterns = {
            'restaurant': r'\b(restaurant|dining|food|reservation)\b',
            'movie': r'\b(movie|cinema|film|ticket)\b',
            'ride_share': r'\b(ride|taxi|uber|lyft)\b',
            'coffee': r'\b(coffee|café|cafe|starbucks)\b',
            'pizza': r'\b(pizza|delivery|order food)\b',
            'auto': r'\b(car|vehicle|repair|maintenance)\b',
        }
        
        scenario_lower = scenario.lower()
        
        for domain, pattern in domain_patterns.items():
            if re.search(pattern, scenario_lower):
                return domain
                
        return 'other'
    
    def convert_to_pipeline_format(self, taskmaster_dialogues: List[TaskmasterDialogue]) -> List[Dict]:
        """
        Convert TaskmasterDialogues to the format expected by the ProcessingPipeline
        """
        pipeline_dialogues = []
        
        for dialogue in taskmaster_dialogues:
            # Convert turns to the expected format
            processed_turns = []
            for turn in dialogue.turns:
                if turn['text'].strip():  # Skip empty turns
                    processed_turns.append({
                        'speaker': turn['speaker'],
                        'text': turn['text']
                    })
            
            # Create dialogue in pipeline format
            pipeline_dialogue = {
                'dialogue_id': dialogue.conversation_id,
                'turns': processed_turns,
                'metadata': {
                    'instruction_id': dialogue.instruction_id,
                    'scenario': dialogue.scenario,
                    'domain': dialogue.domain,
                    **dialogue.original_metadata
                }
            }
            
            pipeline_dialogues.append(pipeline_dialogue)
            
        return pipeline_dialogues