"""API endpoints for template-driven analysis system."""

import logging
from typing import Dict, List, Optional, Any
from fastapi import APIRouter, HTTPException, Depends, BackgroundTasks, Query
from pydantic import BaseModel, Field

from ..core.dependencies import get_current_user
from ..models.user import User
from ..models.analysis_templates import (
    AnalysisTemplate, 
    TemplateSet, 
    TemplateRegistry,
    TemplateType,
    ComplexityLevel
)
from ..services.template_driven_agent import (
    TemplateDrivenAgent,
    TemplateAnalysisRequest,
    TemplateAnalysisResult
)
from ..services.template_defaults import DEFAULT_REGISTRY
from ..services.enhanced_orchestrator import (
    EnhancedMultiAgentOrchestrator,
    OrchestrationConfig,
    OrchestrationResult
)
from ..services.template_agent_factory import get_template_agent_factory

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/templates", tags=["Analysis Templates"])


# Request/Response Models
class AnalyzeWithTemplateRequest(BaseModel):
    """Request to analyze content with a specific template."""
    content: str = Field(..., description="Content to analyze", min_length=10)
    template_id: str = Field(..., description="Template ID to use for analysis")
    context: Dict[str, Any] = Field(default_factory=dict, description="Additional context variables")
    video_id: Optional[str] = Field(None, description="Video ID if analyzing video content")


class AnalyzeWithTemplateSetRequest(BaseModel):
    """Request to analyze content with a template set."""
    content: str = Field(..., description="Content to analyze", min_length=10)
    template_set_id: str = Field(..., description="Template set ID to use")
    context: Dict[str, Any] = Field(default_factory=dict, description="Additional context variables")
    include_synthesis: bool = Field(default=True, description="Whether to include synthesis of results")
    video_id: Optional[str] = Field(None, description="Video ID if analyzing video content")


class MultiTemplateAnalysisResult(BaseModel):
    """Result from analyzing content with multiple templates."""
    template_set_id: str
    template_set_name: str
    results: Dict[str, TemplateAnalysisResult]
    synthesis_result: Optional[TemplateAnalysisResult] = None
    total_processing_time_seconds: float


class CreateTemplateRequest(BaseModel):
    """Request to create a custom template."""
    name: str = Field(..., min_length=1, max_length=100)
    description: str = Field(..., min_length=10, max_length=500)
    template_type: TemplateType
    system_prompt: str = Field(..., min_length=50)
    analysis_focus: List[str] = Field(..., min_items=1, max_items=10)
    output_format: str = Field(..., min_length=20)
    complexity_level: Optional[ComplexityLevel] = None
    target_audience: str = Field(default="general")
    tone: str = Field(default="professional")
    depth: str = Field(default="standard")
    variables: Dict[str, Any] = Field(default_factory=dict)
    tags: List[str] = Field(default_factory=list, max_items=10)


class UpdateTemplateRequest(BaseModel):
    """Request to update an existing template."""
    name: Optional[str] = Field(None, min_length=1, max_length=100)
    description: Optional[str] = Field(None, min_length=10, max_length=500)
    system_prompt: Optional[str] = Field(None, min_length=50)
    analysis_focus: Optional[List[str]] = Field(None, min_items=1, max_items=10)
    output_format: Optional[str] = Field(None, min_length=20)
    target_audience: Optional[str] = None
    tone: Optional[str] = None
    depth: Optional[str] = None
    variables: Optional[Dict[str, Any]] = None
    tags: Optional[List[str]] = Field(None, max_items=10)
    is_active: Optional[bool] = None


# Enhanced Unified System Request/Response Models

class UnifiedAnalysisRequest(BaseModel):
    """Request for unified multi-agent analysis."""
    content: str = Field(..., description="Content to analyze", min_length=10)
    template_set_id: str = Field(..., description="Template set ID for orchestrated analysis")
    context: Dict[str, Any] = Field(default_factory=dict, description="Additional context variables")
    video_id: Optional[str] = Field(None, description="Video ID if analyzing video content")
    enable_synthesis: bool = Field(default=True, description="Whether to synthesize results")
    parallel_execution: bool = Field(default=True, description="Execute agents in parallel")
    save_to_database: bool = Field(default=True, description="Save results to database")


class MixedPerspectiveRequest(BaseModel):
    """Request for mixed perspective analysis (Educational + Domain)."""
    content: str = Field(..., description="Content to analyze", min_length=10)
    template_ids: List[str] = Field(..., description="List of template IDs to use", min_items=1, max_items=10)
    context: Dict[str, Any] = Field(default_factory=dict, description="Additional context variables")
    video_id: Optional[str] = Field(None, description="Video ID if analyzing video content")
    enable_synthesis: bool = Field(default=True, description="Whether to synthesize mixed results")


class OrchestrationResultResponse(BaseModel):
    """Response from unified orchestration."""
    job_id: str
    template_set_id: str
    results: Dict[str, TemplateAnalysisResult]
    synthesis_result: Optional[TemplateAnalysisResult] = None
    processing_time_seconds: float
    success: bool
    error: Optional[str] = None
    metadata: Dict[str, Any]
    timestamp: str


# Dependencies

async def get_template_agent() -> TemplateDrivenAgent:
    """Get template-driven agent instance."""
    return TemplateDrivenAgent(template_registry=DEFAULT_REGISTRY)


async def get_enhanced_orchestrator() -> EnhancedMultiAgentOrchestrator:
    """Get enhanced multi-agent orchestrator instance."""
    agent_factory = get_template_agent_factory(template_registry=DEFAULT_REGISTRY)
    config = OrchestrationConfig(
        parallel_execution=True,
        synthesis_enabled=True,
        max_concurrent_agents=4,
        timeout_seconds=300,
        enable_database_persistence=True
    )
    return EnhancedMultiAgentOrchestrator(
        template_registry=DEFAULT_REGISTRY,
        agent_factory=agent_factory,
        config=config
    )


# Analysis Endpoints
@router.post("/analyze", response_model=TemplateAnalysisResult)
async def analyze_with_template(
    request: AnalyzeWithTemplateRequest,
    agent: TemplateDrivenAgent = Depends(get_template_agent),
    current_user: User = Depends(get_current_user)
):
    """Analyze content using a specific template."""
    try:
        analysis_request = TemplateAnalysisRequest(
            content=request.content,
            template_id=request.template_id,
            context=request.context,
            video_id=request.video_id
        )
        
        result = await agent.analyze_with_template(analysis_request)
        
        logger.info(f"Template analysis completed: {request.template_id} for user {current_user.id}")
        return result
        
    except Exception as e:
        logger.error(f"Template analysis failed: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/analyze-set", response_model=MultiTemplateAnalysisResult)
async def analyze_with_template_set(
    request: AnalyzeWithTemplateSetRequest,
    background_tasks: BackgroundTasks,
    agent: TemplateDrivenAgent = Depends(get_template_agent),
    current_user: User = Depends(get_current_user)
):
    """Analyze content using all templates in a template set."""
    try:
        import time
        start_time = time.time()
        
        # Analyze with template set
        results = await agent.analyze_with_template_set(
            content=request.content,
            template_set_id=request.template_set_id,
            context=request.context,
            video_id=request.video_id
        )
        
        synthesis_result = None
        if request.include_synthesis:
            synthesis_result = await agent.synthesize_results(
                results=results,
                template_set_id=request.template_set_id,
                context=request.context
            )
        
        total_processing_time = time.time() - start_time
        
        # Get template set info
        template_set = DEFAULT_REGISTRY.get_template_set(request.template_set_id)
        template_set_name = template_set.name if template_set else "Unknown"
        
        result = MultiTemplateAnalysisResult(
            template_set_id=request.template_set_id,
            template_set_name=template_set_name,
            results=results,
            synthesis_result=synthesis_result,
            total_processing_time_seconds=total_processing_time
        )
        
        logger.info(f"Template set analysis completed: {request.template_set_id} for user {current_user.id}")
        return result
        
    except Exception as e:
        logger.error(f"Template set analysis failed: {e}")
        raise HTTPException(status_code=500, detail=str(e))


# Template Management Endpoints
@router.get("/list", response_model=List[AnalysisTemplate])
async def list_templates(
    template_type: Optional[TemplateType] = Query(None, description="Filter by template type"),
    active_only: bool = Query(True, description="Only return active templates"),
    agent: TemplateDrivenAgent = Depends(get_template_agent)
):
    """List all available templates."""
    try:
        templates = agent.template_registry.list_templates(template_type)
        
        if active_only:
            templates = [t for t in templates if t.is_active]
        
        return templates
        
    except Exception as e:
        logger.error(f"Failed to list templates: {e}")
        raise HTTPException(status_code=500, detail="Failed to list templates")


@router.get("/sets", response_model=List[TemplateSet])
async def list_template_sets(
    template_type: Optional[TemplateType] = Query(None, description="Filter by template type"),
    active_only: bool = Query(True, description="Only return active template sets"),
    agent: TemplateDrivenAgent = Depends(get_template_agent)
):
    """List all available template sets."""
    try:
        template_sets = agent.template_registry.list_template_sets(template_type)
        
        if active_only:
            template_sets = [ts for ts in template_sets if ts.is_active]
        
        return template_sets
        
    except Exception as e:
        logger.error(f"Failed to list template sets: {e}")
        raise HTTPException(status_code=500, detail="Failed to list template sets")


@router.get("/template/{template_id}", response_model=AnalysisTemplate)
async def get_template(
    template_id: str,
    agent: TemplateDrivenAgent = Depends(get_template_agent)
):
    """Get a specific template by ID."""
    template = agent.template_registry.get_template(template_id)
    if not template:
        raise HTTPException(status_code=404, detail="Template not found")
    
    return template


@router.get("/set/{set_id}", response_model=TemplateSet)
async def get_template_set(
    set_id: str,
    agent: TemplateDrivenAgent = Depends(get_template_agent)
):
    """Get a specific template set by ID."""
    template_set = agent.template_registry.get_template_set(set_id)
    if not template_set:
        raise HTTPException(status_code=404, detail="Template set not found")
    
    return template_set


# Custom Template Creation (Future Enhancement)
@router.post("/create", response_model=AnalysisTemplate)
async def create_custom_template(
    request: CreateTemplateRequest,
    agent: TemplateDrivenAgent = Depends(get_template_agent),
    current_user: User = Depends(get_current_user)
):
    """Create a custom template (placeholder for future implementation)."""
    # This is a placeholder for custom template creation
    # In a full implementation, this would:
    # 1. Validate the template configuration
    # 2. Save to database
    # 3. Register with template registry
    # 4. Handle template versioning and permissions
    
    raise HTTPException(
        status_code=501, 
        detail="Custom template creation not yet implemented. Use default templates."
    )


# Unified Multi-Agent Analysis Endpoints

@router.post("/unified-analyze", response_model=OrchestrationResultResponse)
async def unified_analysis(
    request: UnifiedAnalysisRequest,
    background_tasks: BackgroundTasks,
    orchestrator: EnhancedMultiAgentOrchestrator = Depends(get_enhanced_orchestrator),
    current_user: User = Depends(get_current_user)
):
    """Perform unified multi-agent analysis using a template set."""
    import uuid
    
    try:
        job_id = str(uuid.uuid4())
        
        # Perform orchestrated analysis
        result = await orchestrator.orchestrate_template_set(
            job_id=job_id,
            template_set_id=request.template_set_id,
            content=request.content,
            context=request.context,
            video_id=request.video_id
        )
        
        # Convert OrchestrationResult to response format
        response = OrchestrationResultResponse(
            job_id=result.job_id,
            template_set_id=result.template_set_id,
            results=result.results,
            synthesis_result=result.synthesis_result,
            processing_time_seconds=result.processing_time_seconds,
            success=result.success,
            error=result.error,
            metadata=result.metadata,
            timestamp=result.timestamp.isoformat()
        )
        
        logger.info(f"Unified analysis completed: {job_id} for user {current_user.id}")
        return response
        
    except Exception as e:
        logger.error(f"Unified analysis failed: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/mixed-perspective", response_model=OrchestrationResultResponse)
async def mixed_perspective_analysis(
    request: MixedPerspectiveRequest,
    background_tasks: BackgroundTasks,
    orchestrator: EnhancedMultiAgentOrchestrator = Depends(get_enhanced_orchestrator),
    current_user: User = Depends(get_current_user)
):
    """Perform analysis using mixed perspectives (Educational + Domain)."""
    import uuid
    
    try:
        job_id = str(uuid.uuid4())
        
        # Perform mixed perspective analysis
        result = await orchestrator.orchestrate_mixed_perspectives(
            job_id=job_id,
            template_ids=request.template_ids,
            content=request.content,
            context=request.context,
            video_id=request.video_id,
            enable_synthesis=request.enable_synthesis
        )
        
        # Convert OrchestrationResult to response format
        response = OrchestrationResultResponse(
            job_id=result.job_id,
            template_set_id=result.template_set_id,
            results=result.results,
            synthesis_result=result.synthesis_result,
            processing_time_seconds=result.processing_time_seconds,
            success=result.success,
            error=result.error,
            metadata=result.metadata,
            timestamp=result.timestamp.isoformat()
        )
        
        logger.info(f"Mixed perspective analysis completed: {job_id} for user {current_user.id}")
        return response
        
    except Exception as e:
        logger.error(f"Mixed perspective analysis failed: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/orchestrator/stats")
async def get_orchestrator_statistics(
    orchestrator: EnhancedMultiAgentOrchestrator = Depends(get_enhanced_orchestrator),
    current_user: User = Depends(get_current_user)
):
    """Get comprehensive orchestrator and factory statistics."""
    try:
        stats = orchestrator.get_orchestration_statistics()
        active_jobs = orchestrator.get_active_orchestrations()
        
        return {
            "orchestrator_stats": stats,
            "active_orchestrations": active_jobs,
            "system_status": "operational"
        }
        
    except Exception as e:
        logger.error(f"Failed to get orchestrator statistics: {e}")
        raise HTTPException(status_code=500, detail="Failed to get orchestrator statistics")


# Statistics and Information Endpoints
@router.get("/stats")
async def get_template_statistics(
    agent: TemplateDrivenAgent = Depends(get_template_agent),
    current_user: User = Depends(get_current_user)
):
    """Get template usage statistics."""
    try:
        usage_stats = agent.get_usage_stats()
        available_templates = len(agent.get_available_templates())
        available_sets = len(agent.get_available_template_sets())
        
        return {
            "available_templates": available_templates,
            "available_template_sets": available_sets,
            "usage_statistics": usage_stats,
            "total_uses": sum(usage_stats.values())
        }
        
    except Exception as e:
        logger.error(f"Failed to get template statistics: {e}")
        raise HTTPException(status_code=500, detail="Failed to get statistics")


@router.get("/types", response_model=List[str])
async def get_template_types():
    """Get list of available template types."""
    return [template_type.value for template_type in TemplateType]


@router.get("/complexity-levels", response_model=List[str])
async def get_complexity_levels():
    """Get list of available complexity levels."""
    return [level.value for level in ComplexityLevel]


# Health check
@router.get("/health")
async def template_service_health():
    """Health check for template service."""
    try:
        agent = await get_template_agent()
        template_count = len(agent.get_available_templates())
        set_count = len(agent.get_available_template_sets())
        
        return {
            "status": "healthy",
            "available_templates": template_count,
            "available_template_sets": set_count,
            "timestamp": "2024-01-01T00:00:00Z"  # Would use actual timestamp
        }
        
    except Exception as e:
        logger.error(f"Template service health check failed: {e}")
        raise HTTPException(status_code=503, detail="Template service unhealthy")