backend/app/services/llm.py

import hashlib
import json
import httpx
import google.generativeai as genai
from app.config import settings
from app.schemas.analysis import AnalysisResult, RiskItem, ActionItem, CompanyProfile, Tender
from app.services.report import generate_markdown_report

# Configure Gemini
genai.configure(api_key=settings.gemini_api_key)

async def call_gemini(prompt: str, is_json: bool = False) -> str:
    if not settings.gemini_api_key:
        return ""
        
    try:
        generation_config = {
            "temperature": 0.2,
            "top_p": 0.95,
            "top_k": 40,
            "max_output_tokens": 8192,
        }
        
        if is_json:
            generation_config["response_mime_type"] = "application/json"
            
        model = genai.GenerativeModel(
            model_name="gemini-2.0-flash",
            generation_config=generation_config,
        )
        
        response = await model.generate_content_async(prompt)
        return response.text
    except Exception as e:
        print(f"Error calling Gemini (is_json={is_json}): {e}, trying fallback...")
        if settings.groq_api_key:
            return await call_groq(prompt, "llama-3.3-70b-versatile")
        return await call_featherless(prompt, "Qwen/Qwen2.5-72B-Instruct")

async def call_featherless(prompt: str, model: str = "Qwen/Qwen2.5-72B-Instruct") -> str:
    if not settings.featherless_api_key:
        return ""

    try:
        async with httpx.AsyncClient(timeout=60.0) as client:
            payload = {
                "model": model,
                "messages": [{"role": "user", "content": prompt}],
                "temperature": 0.2
            }
            if "json" in prompt.lower():
                payload["response_format"] = {"type": "json_object"}

            response = await client.post(
                "https://api.featherless.ai/v1/chat/completions",
                headers={
                    "Authorization": f"Bearer {settings.featherless_api_key}",
                    "Content-Type": "application/json"
                },
                json=payload
            )
            if response.status_code != 200:
                print(f"Featherless Error ({model}): {response.status_code} - {response.text}")
                return ""
            data = response.json()
            return data["choices"][0]["message"]["content"]
    except Exception as e:
        print(f"Error calling Featherless ({model}): {e}")
        return ""

async def call_groq(prompt: str, model: str = "llama-3.3-70b-versatile") -> str:
    if not settings.groq_api_key:
        return ""

    try:
        async with httpx.AsyncClient(timeout=60.0) as client:
            payload = {
                "model": model,
                "messages": [{"role": "user", "content": prompt}],
                "temperature": 0.2
            }
            if "json" in prompt.lower():
                payload["response_format"] = {"type": "json_object"}

            response = await client.post(
                "https://api.groq.com/openai/v1/chat/completions",
                headers={
                    "Authorization": f"Bearer {settings.groq_api_key}",
                    "Content-Type": "application/json"
                },
                json=payload
            )
            if response.status_code != 200:
                print(f"Groq Error ({model}): {response.status_code} - {response.text}")
                return ""
            data = response.json()
            return data["choices"][0]["message"]["content"]
    except Exception as e:
        print(f"Error calling Groq ({model}): {e}")
        return ""

async def call_gemini_with_model(prompt: str, model_name: str | None = None, is_json: bool = False) -> str:
    model_map = {
        "Gemini 2.5 Flash": "gemini",
        "DeepSeek-V3 (Featherless)": "deepseek-ai/DeepSeek-V3",
        "Qwen-2.5 (Featherless)": "Qwen/Qwen2.5-72B-Instruct",
        "Llama-3.3-70B (Groq)": "groq:llama-3.3-70b-versatile",
        "Llama-3.1-8B (Groq)": "groq:llama-3.1-8b-instant",
        "Llama-3.1-70B (Groq)": "groq:llama-3.1-70b-versatile",
        "Mixtral-8x7B (Groq)": "groq:mixtral-8x7b-32768",
        "Gemma-2-9B (Featherless)": "google/gemma-2-9b-it",
        "Llama-3.1-8B (Featherless)": "meta-llama/Meta-Llama-3.1-8B-Instruct",
        "Llama-3.2-11B-Vision (Groq)": "groq:llama-3.2-11b-vision-preview",
    }

    model_id = model_map.get(model_name, "gemini")
    print(f"DEBUG: Calling LLM with model_name='{model_name}' -> model_id='{model_id}'")
    
    # Check keys
    if model_id.startswith("groq:") and not settings.groq_api_key:
        print("DEBUG WARNING: GROQ_API_KEY is missing! Falling back to Gemini.")
        model_id = "gemini"
    
    if model_id == "gemini":
        res = await call_gemini(prompt, is_json=is_json)
        if not res and settings.groq_api_key:
            print("DEBUG: Gemini failed or returned empty. Trying Groq fallback.")
            return await call_groq(prompt, "llama-3.3-70b-versatile")
        return res
    elif model_id.startswith("groq:"):
        # Check if it's a vision call (hacky way for now, but effective)
        if "IMAGE_DATA:" in prompt:
            parts = prompt.split("IMAGE_DATA:")
            text_prompt = parts[0].strip()
            image_b64 = parts[1].strip()
            res = await call_groq_vision(text_prompt, image_b64, model=model_id[5:])
        else:
            res = await call_groq(prompt, model=model_id[5:])
            
        if not res and settings.gemini_api_key:
            print("DEBUG: Groq failed or returned empty. Trying Gemini fallback.")
            return await call_gemini(prompt, is_json=is_json)
        return res
    else:
        res = await call_featherless(prompt, model=model_id)
        if not res and settings.groq_api_key:
            print("DEBUG: Featherless failed. Trying Groq fallback.")
            return await call_groq(prompt, "llama-3.3-70b-versatile")
        return res

async def call_groq_vision(prompt: str, image_b64: str, model: str = "llama-3.2-11b-vision-preview") -> str:
    if not settings.groq_api_key:
        return ""

    try:
        async with httpx.AsyncClient(timeout=60.0) as client:
            # Ensure proper data URL format
            if not image_b64.startswith("data:image"):
                image_b64 = f"data:image/jpeg;base64,{image_b64}"

            payload = {
                "model": model,
                "messages": [
                    {
                        "role": "user",
                        "content": [
                            {"type": "text", "text": prompt},
                            {
                                "type": "image_url",
                                "image_url": {"url": image_b64}
                            }
                        ]
                    }
                ],
                "temperature": 0.2
            }

            response = await client.post(
                "https://api.groq.com/openai/v1/chat/completions",
                headers={
                    "Authorization": f"Bearer {settings.groq_api_key}",
                    "Content-Type": "application/json"
                },
                json=payload
            )
            if response.status_code != 200:
                print(f"Groq Vision Error ({model}): {response.status_code} - {response.text}")
                return ""
            data = response.json()
            return data["choices"][0]["message"]["content"]
    except Exception as e:
        print(f"Error calling Groq Vision ({model}): {e}")
        return ""

def _parse_gemini_response(output: str) -> dict | None:
    if not output:
        return None
    
    # Remove Markdown code blocks if present
    clean_output = output.strip()
    if clean_output.startswith("```json"):
        clean_output = clean_output[7:-3].strip()
    elif clean_output.startswith("```"):
        clean_output = clean_output[3:-3].strip()
        
    try:
        data = json.loads(clean_output)
    except Exception as e:
        print(f"JSON Parsing Error: {e}\nRaw Output: {output[:200]}...")
        return None
    
    if data:
        # Handle nesting (LLMs sometimes wrap the result in a key)
        if not all(k in data for k in ["fit_score", "decision", "risks"]):
            for val in data.values():
                if isinstance(val, dict) and any(k in val for k in ["fit_score", "decision", "risks"]):
                    data = val
                    break
        
        # Ensure strategic_roadmap is a string
        if "strategic_roadmap" in data:
            if isinstance(data["strategic_roadmap"], list):
                data["strategic_roadmap"] = "\n".join([str(item) for item in data["strategic_roadmap"]])
            elif isinstance(data["strategic_roadmap"], dict):
                data["strategic_roadmap"] = json.dumps(data["strategic_roadmap"], indent=2, ensure_ascii=False)
        
        # Ensure risks is a list of objects
        if "risks" in data and isinstance(data["risks"], list):
            new_risks = []
            for item in data["risks"]:
                if isinstance(item, str):
                    new_risks.append({"title": item, "severity": "Medium", "explanation": item})
                elif isinstance(item, dict):
                    new_risks.append(item)
            data["risks"] = new_risks

        # Ensure action_plan is a list of objects
        if "action_plan" in data and isinstance(data["action_plan"], list):
            new_plan = []
            for item in data["action_plan"]:
                if isinstance(item, str):
                    new_plan.append({"task": item, "priority": "Medium", "owner": "Team", "timeline": "TBD"})
                elif isinstance(item, dict):
                    new_plan.append(item)
            data["action_plan"] = new_plan

        # Ensure fit_score is int
        if "fit_score" in data:
            try:
                data["fit_score"] = int(data["fit_score"])
            except:
                data["fit_score"] = 0
            
        return data
    return None

def generate_mock_analysis(tender: Tender, company: CompanyProfile) -> AnalysisResult:
    raw = f"{tender.code}:{tender.name}:{company.name}"
    digest = hashlib.sha256(raw.encode("utf-8")).hexdigest()
    score = int(digest[:8], 16) % 41 + 55
    
    return AnalysisResult(
        fit_score=score,
        decision="Recommended" if score > 75 else "Review Carefully",
        executive_summary=f"Análisis automático para {tender.name}. Se observa un encaje técnico razonable.",
        key_requirements=["Documentación legal", "Experiencia técnica", "Garantía de seriedad"],
        risks=[{"title": "Plazo ajustado", "severity": "Medium", "explanation": "El tiempo de entrega es crítico."}],
        compliance_gaps=["Validar boleta de garantía"],
        action_plan=[{"task": "Revisar bases", "priority": "High", "owner": "Legal", "timeline": "2 días"}],
        proposal_draft="Borrador generado automáticamente...",
        report_markdown="# Reporte de Licitación",
        audit_log=["Iniciando análisis de respaldo...", "Generando datos mock."]
    )

async def generate_analysis(tender: Tender, company: CompanyProfile, document_text: str | None = None, models: dict | None = None) -> AnalysisResult:
    chosen = models or {
        "legal": "Llama-3.3-70B (Groq)" if settings.groq_api_key else "Gemini 2.5 Flash",
        "tech": "Llama-3.1-8B (Groq)" if settings.groq_api_key else "Qwen-2.5 (Featherless)",
        "risk": "Llama-3.3-70B (Groq)" if settings.groq_api_key else "Qwen-2.5 (Featherless)"
    }

    audit_messages = ["🚀 Launching Multi-Agent Orchestration Pipeline."]
    agent_outputs = {}

    agent_definitions = {
        "legal": "Experto Legal & Cumplimiento: Evalúa bases administrativas, multas y garantías. Pon especial atención a los ANEXOS de Sustentabilidad y Admisibilidad.",
        "tech": "Ingeniero Técnico: Evalúa arquitectura, stack tecnológico y capacidad de ejecución. Considera si se requieren certificaciones ambientales.",
        "risk": "Estratega Comercial: Evalúa rentabilidad, competencia y riesgos de mercado. Analiza el impacto de los criterios de evaluación ESG en el puntaje final."
    }

    for agent_id, role_desc in agent_definitions.items():
        model_name = chosen.get(agent_id, "Gemini 2.5 Flash")
        audit_messages.append(f"🤖 Agent {agent_id.upper()} calling {model_name}...")
        
        agent_prompt = f"""
        Actúa como {role_desc}
        Licitación: {tender.name} ({tender.code})
        Empresa: {company.name}
        Contexto Adicional: {document_text[:5000] if document_text else 'No adjunto.'}
        
        PROPORCIONA TU ANÁLISIS ESPECÍFICO (Máx 200 palabras) EN ESPAÑOL.
        """
        
        res = await call_gemini_with_model(agent_prompt, model_name=model_name)
        agent_outputs[agent_id] = res or "Análisis no disponible debido a error de conexión."

    audit_messages.append("🧠 Synthesis phase: Consolidating agent insights...")
    
    synthesis_prompt = f"""
    SISTEMA DE CONSENSO ANDESOPS AI
    Licitación: {tender.name}
    Resultados de Agentes:
    - LEGAL: {agent_outputs.get('legal')}
    - TECH: {agent_outputs.get('tech')}
    - RISK: {agent_outputs.get('risk')}
    
    Genera el JSON final AnalysisResult con una decisión fundamentada.
    RESPONDE SOLO EL JSON.
    """
    
    final_json = await call_gemini(synthesis_prompt, is_json=True)
    if not final_json and settings.groq_api_key:
        final_json = await call_groq(synthesis_prompt, model="llama-3.3-70b-versatile")
    elif not final_json and settings.featherless_api_key:
        final_json = await call_featherless(synthesis_prompt, model="Qwen/Qwen2.5-72B-Instruct")

    parse_result = _parse_gemini_response(final_json)
    
    if parse_result:
        try:
            if not parse_result.get("report_markdown"):
                parse_result["report_markdown"] = generate_markdown_report(parse_result)

            if not parse_result.get("proposal_draft") or len(parse_result["proposal_draft"]) < 100:
                audit_messages.append("📝 Generating specialized proposal draft...")
                parse_result["proposal_draft"] = await generate_proposal_draft(parse_result, company)
            
            result = AnalysisResult(**parse_result)
            result.audit_log = audit_messages + (result.audit_log or [])
            return result
        except Exception as e:
            print(f"Validation Error in generate_analysis: {e}")
            
    analysis = generate_mock_analysis(tender, company)
    analysis.audit_log = audit_messages + ["⚠️ Synthesis failed, using emergency fallback."]
    return analysis

async def generate_proposal_draft(analysis: dict, company: CompanyProfile) -> str:
    prompt = f"""
    Como experto redactor de propuestas de licitación, genera un borrador profesional (en Markdown) basado en este análisis técnico:
    {analysis.get('executive_summary', 'Analizar bases adjuntas.')}
    
    Perfil de la Empresa: {company.name} - {company.experience}
    Requisitos Críticos a Abordar: {', '.join(analysis.get('key_requirements', []))}
    
    Estructura la propuesta en ESPAÑOL con:
    1. Introducción Ejecutiva
    2. Resumen de la Solución Técnica
    3. Aseguramiento de Cumplimiento (Compliance)
    4. Propuesta de Valor Estratégica
    """
    
    return await call_gemini_with_model(prompt, model_name="Llama-3.3-70B (Groq)" if settings.groq_api_key else "Gemini 2.5 Flash")

async def generate_synthetic_tenders(keyword: str) -> list[Tender]:
    """
    Generates realistic synthetic tenders with coherent bidding documents (bases)
    when official sources are unavailable or empty.
    """
    prompt = f"""
    Genera 4 licitaciones de Mercado Público CHILE realistas para el rubro: {keyword}
    
    Para cada licitación, genera un JSON con:
    - code: Formato XXXXX-XX-XX26
    - name: Nombre profesional
    - buyer: Una institución pública chilena real
    - description: UN DOCUMENTO EXTENSO de 'Bases Administrativas y Técnicas' (mínimo 300 palabras) 
      que incluya: Objeto de licitación, Requisitos técnicos, Plazos, Multas y Criterios de Evaluación.
    - status: 'Publicada'
    - closing_date: ISO date en 2 semanas
    - estimated_amount: Monto en CLP entre 5M y 50M
    - region: Una región de Chile
    
    RESPONDE SOLO EL JSON (Lista de objetos).
    """
    
    res = await call_gemini(prompt, is_json=True)
    items = []
    try:
        data = json.loads(res)
        # Handle if LLM wraps in a key
        if isinstance(data, dict):
            for v in data.values():
                if isinstance(v, list):
                    data = v
                    break
        
        for i in data:
            items.append(Tender(
                code=i.get("code", "000-00-00"),
                name=i.get("name", "Licitación Sintética"),
                description=i.get("description", "Documento de bases en proceso..."),
                buyer=i.get("buyer", "Organismo Público"),
                status=i.get("status", "Publicada"),
                closing_date=i.get("closing_date", datetime.now().isoformat()),
                estimated_amount=float(i.get("estimated_amount", 0)),
                source="AndesOps AI - Intelligent Discovery",
                region=i.get("region", "Nacional"),
                sector="Privado/Público",
                items=[],
                attachments=[{
                    "name": "Bases_Tecnicas_y_Administrativas.pdf",
                    "url": "#synthetic-doc",
                    "type": "pdf"
                }]
            ))
    except Exception as e:
        print(f"Error generating synthetic tenders: {e}")
        
    return items