"""
FastAPI application — Lead Generation & Outreach System.

Provides REST endpoints for scraping Google Maps leads,
managing leads/templates, and exporting data.
"""

import logging
import os
import threading
from pathlib import Path
from typing import Optional

from fastapi import FastAPI, HTTPException, Query, BackgroundTasks
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import Response, FileResponse
from fastapi.staticfiles import StaticFiles

import re
import requests
from bs4 import BeautifulSoup

import database as db
from models import (
    ScrapeRequest,
    ScrapeStatusResponse,
    LeadUpdate,
    TemplateCreate,
    TemplateUpdate,
    DashboardStats,
)
from scraper import scrape_google_maps

# ──────────────────────── Logging ────────────────────────

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
)
logger = logging.getLogger(__name__)

# ──────────────────────── App Setup ────────────────────────

app = FastAPI(
    title="Lead Generation System",
    description="Scrape Google Maps leads, manage them, and send WhatsApp outreach.",
    version="1.0.0",
)

# CORS — allow frontend to call the API
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Initialize database on startup
@app.on_event("startup")
def startup():
    db.init_db()
    logger.info("Database initialized ✓")


# ──────────────────────── Scraper State ────────────────────────

scrape_state = {
    "status": "idle",       # idle | running | completed | failed
    "total_found": 0,
    "message": "",
    "lock": threading.Lock(),
}


def fetch_socials_background(lead_id: int, website: str):
    """Scrape website for email, instagram, linkedin."""
    if not website:
        return
    try:
        if not website.startswith('http'):
            website = 'https://' + website
            
        headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36'}
        r = requests.get(website, headers=headers, timeout=10)
        soup = BeautifulSoup(r.text, 'html.parser')

        email = None
        instagram = None
        linkedin = None

        for a in soup.find_all('a', href=True):
            href = a['href']
            if href.startswith('mailto:') and not email:
                email = href.replace('mailto:', '').split('?')[0].strip()
            if 'instagram.com' in href and not instagram:
                instagram = href.strip()
            if 'linkedin.com' in href and not linkedin:
                linkedin = href.strip()

        if not email:
            matches = re.findall(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', r.text)
            if matches:
                # filter out common false positives like image extensions
                for m in matches:
                    if not any(m.endswith(x) for x in ['.png', '.jpg', '.jpeg', '.gif', '.webp']):
                        email = m
                        break

        updates = {}
        if email: updates['email'] = email
        if instagram: updates['instagram'] = instagram
        if linkedin: updates['linkedin'] = linkedin

        if updates:
            db.update_lead(lead_id, **updates)
            logger.info(f"Socials found for lead {lead_id}: {updates}")
    except Exception as e:
        logger.warning(f"website scrape failed for {website}: {e}")

def _run_scrape_task(query: str, limit: int, lat: float = None, lng: float = None, zoom: int = 14):
    """Background scraping task."""
    with scrape_state["lock"]:
        scrape_state["status"] = "running"
        scrape_state["total_found"] = 0
        scrape_state["message"] = f"Scraping: {query}"

    def on_progress(count, msg):
        scrape_state["total_found"] = count
        scrape_state["message"] = msg

    try:
        leads = scrape_google_maps(query, limit, lat, lng, zoom, progress_callback=on_progress)

        # Insert leads into database
        added = 0
        for lead in leads:
            if lead.get("name"):
                lead_id = db.insert_lead(
                    name=lead["name"],
                    phone=lead.get("phone"),
                    address=lead.get("address"),
                    website=lead.get("website"),
                )
                added += 1
                
                # trigger website scrape if there is a website
                if lead.get("website"):
                    threading.Thread(target=fetch_socials_background, args=(lead_id, lead.get("website")), daemon=True).start()

        with scrape_state["lock"]:
            scrape_state["status"] = "completed"
            scrape_state["total_found"] = added
            scrape_state["message"] = f"Done! Added {added} leads from '{query}'"

        logger.info(f"Scrape complete: {added} leads added for '{query}'")

    except Exception as e:
        logger.error(f"Scrape failed: {e}")
        with scrape_state["lock"]:
            scrape_state["status"] = "failed"
            scrape_state["message"] = f"Error: {str(e)}"


# ──────────────────────── Scraper Endpoints ────────────────────────


@app.post("/api/scrape", response_model=ScrapeStatusResponse)
def trigger_scrape(req: ScrapeRequest, background_tasks: BackgroundTasks):
    """Start a scraping job in the background."""
    if scrape_state["status"] == "running":
        raise HTTPException(status_code=409, detail="A scrape is already running")

    background_tasks.add_task(_run_scrape_task, req.query, req.limit, req.lat, req.lng, req.zoom)
    return ScrapeStatusResponse(status="running", message=f"Started scraping: {req.query}")


@app.get("/api/scrape/status", response_model=ScrapeStatusResponse)
def get_scrape_status():
    """Get the current scraping job status."""
    return ScrapeStatusResponse(
        status=scrape_state["status"],
        total_found=scrape_state["total_found"],
        message=scrape_state["message"],
    )


# ──────────────────────── Leads Endpoints ────────────────────────


@app.get("/api/leads")
def get_leads(
    search: Optional[str] = Query(None, description="Search by name, phone, or address"),
    status: Optional[str] = Query(None, description="Filter by status"),
    sort_by: str = Query("created_at", description="Sort field"),
    sort_order: str = Query("desc", description="Sort order: asc or desc"),
):
    """Get all leads with optional search, filter, and sort."""
    leads = db.get_all_leads(search=search, status=status, sort_by=sort_by, sort_order=sort_order)
    return {"leads": leads, "count": len(leads)}


# NOTE: Static paths must be defined BEFORE parameterized /{lead_id} paths
@app.get("/api/leads/export/csv")
def export_csv(status: Optional[str] = Query(None)):
    """Export leads to CSV file."""
    csv_data = db.export_leads_csv(status=status)
    return Response(
        content=csv_data,
        media_type="text/csv",
        headers={"Content-Disposition": "attachment; filename=leads_export.csv"},
    )


@app.get("/api/leads/{lead_id}")
def get_lead(lead_id: int):
    """Get a single lead by ID."""
    lead = db.get_lead_by_id(lead_id)
    if not lead:
        raise HTTPException(status_code=404, detail="Lead not found")
    return lead


@app.put("/api/leads/{lead_id}")
def update_lead(lead_id: int, data: LeadUpdate):
    """Update a lead's status, notes, etc."""
    update_data = data.model_dump(exclude_unset=True)
    if not update_data:
        raise HTTPException(status_code=400, detail="No fields to update")

    success = db.update_lead(lead_id, **update_data)
    if not success:
        raise HTTPException(status_code=404, detail="Lead not found")
    return {"message": "Lead updated", "lead": db.get_lead_by_id(lead_id)}


@app.delete("/api/leads/{lead_id}")
def delete_lead(lead_id: int):
    """Delete a lead."""
    success = db.delete_lead(lead_id)
    if not success:
        raise HTTPException(status_code=404, detail="Lead not found")
    return {"message": "Lead deleted"}


# ──────────────────────── Stats Endpoint ────────────────────────


@app.get("/api/stats", response_model=DashboardStats)
def get_stats():
    """Get dashboard statistics."""
    return db.get_dashboard_stats()


# ──────────────────────── Template Endpoints ────────────────────────


@app.get("/api/templates")
def get_templates():
    """Get all message templates."""
    templates = db.get_all_templates()
    return {"templates": templates}


@app.post("/api/templates")
def create_template(data: TemplateCreate):
    """Create a new message template."""
    tid = db.create_template(data.name, data.content)
    return {"message": "Template created", "id": tid}


@app.put("/api/templates/{template_id}")
def update_template(template_id: int, data: TemplateUpdate):
    """Update a message template."""
    update_data = data.model_dump(exclude_unset=True)
    success = db.update_template(template_id, **update_data)
    if not success:
        raise HTTPException(status_code=404, detail="Template not found")
    return {"message": "Template updated"}


@app.delete("/api/templates/{template_id}")
def delete_template(template_id: int):
    """Delete a message template."""
    success = db.delete_template(template_id)
    if not success:
        raise HTTPException(status_code=404, detail="Template not found")
    return {"message": "Template deleted"}


# ──────────────────────── Serve Frontend ────────────────────────

# Resolve the frontend directory relative to this file
FRONTEND_DIR = Path(__file__).resolve().parent.parent / "frontend"

if FRONTEND_DIR.exists():
    # Serve static files (CSS, JS) from /static
    app.mount("/static", StaticFiles(directory=str(FRONTEND_DIR)), name="static")

    @app.get("/")
    def serve_index():
        """Serve the main frontend page."""
        return FileResponse(str(FRONTEND_DIR / "index.html"))

    @app.get("/{path:path}")
    def serve_frontend(path: str):
        """Serve frontend static files (CSS, JS, etc)."""
        file_path = FRONTEND_DIR / path
        if file_path.exists() and file_path.is_file():
            return FileResponse(str(file_path))
        return FileResponse(str(FRONTEND_DIR / "index.html"))


# ──────────────────────── Run ────────────────────────

if __name__ == "__main__":
    import uvicorn
    port = int(os.environ.get("PORT", 7860))
    uvicorn.run("main:app", host="0.0.0.0", port=port, reload=True)