from fastapi import FastAPI, Query, Body, HTTPException
from enum import Enum
import json
import os
from typing import List, Dict
from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.triggers.cron import CronTrigger
from cidr_collector import CIDRCollector, FQDNCollector, load_full_config

app = FastAPI(title="RIPE CIDR/FQDN API")

class AddressType(str, Enum):
    cidr = "cidr"
    fqdn = "fqdn"
    all_types = "all"

DATA_FILE = "data.json"
FQDN_DATA_FILE = "fqdn_data.json"
CONFIG_FILE = "config.json"

scheduler = BackgroundScheduler()

# Wrapper functions for scheduler
def run_asn_job():
    print("Running scheduled ASN collection...")
    # Re-instantiate to ensure fresh config
    collector = CIDRCollector()
    collector.run_collection()

def run_fqdn_job():
    print("Running scheduled FQDN collection...")
    # Re-instantiate to ensure fresh config
    collector = FQDNCollector()
    collector.run_collection()

def load_json(filename):
    if not os.path.exists(filename):
        return {}
    try:
        with open(filename, 'r') as f:
            return json.load(f)
    except Exception:
        return {}

def get_cidrs() -> List[str]:
    data = load_json(DATA_FILE)
    cidrs = set()
    for asn_data in data.values():
        for prefix in asn_data.get("prefixes", []):
            cidrs.add(prefix)
    return list(cidrs)

def get_fqdn_ips() -> List[str]:
    data = load_json(FQDN_DATA_FILE)
    ips = set()
    for domain_data in data.values():
        for ip in domain_data.get("ips", []):
            ips.add(ip)
    return list(ips)

@app.on_event("startup")
def start_scheduler():
    config = load_full_config()
    schedule_config = config.get("schedule", {})
    
    asn_cron = schedule_config.get("asn", "0 2 * * *")
    fqdn_cron = schedule_config.get("fqdn", "0 3 * * *")
    
    # Add jobs
    scheduler.add_job(run_asn_job, CronTrigger.from_crontab(asn_cron), id="asn_job", replace_existing=True)
    scheduler.add_job(run_fqdn_job, CronTrigger.from_crontab(fqdn_cron), id="fqdn_job", replace_existing=True)
    
    scheduler.start()
    print(f"Scheduler started. ASN: {asn_cron}, FQDN: {fqdn_cron}")

@app.on_event("shutdown")
def shutdown_scheduler():
    scheduler.shutdown()

@app.get("/addresses", response_model=List[str])
def get_addresses(type: AddressType = Query(AddressType.all_types, description="Filter by address type")):
    results = set()
    
    if type in [AddressType.cidr, AddressType.all_types]:
        results.update(get_cidrs())
    
    if type in [AddressType.fqdn, AddressType.all_types]:
        results.update(get_fqdn_ips())
        
    return sorted(list(results))

@app.get("/schedule")
def get_schedule():
    config = load_full_config()
    return config.get("schedule", {})

@app.post("/schedule")
def update_schedule(schedule_update: Dict[str, str] = Body(..., example={"type": "asn", "cron": "*/10 * * * *"})):
    job_type = schedule_update.get("type")
    cron_str = schedule_update.get("cron")
    
    if job_type not in ["asn", "fqdn"]:
        raise HTTPException(status_code=400, detail="Invalid type. Must be 'asn' or 'fqdn'.")
    
    if not cron_str:
        raise HTTPException(status_code=400, detail="Cron string required.")

    # Validate cron string by attempting to create trigger
    try:
        trigger = CronTrigger.from_crontab(cron_str)
    except Exception as e:
         raise HTTPException(status_code=400, detail=f"Invalid cron string: {e}")

    # Update config file
    config = load_full_config()
    if "schedule" not in config:
        config["schedule"] = {}
    
    config["schedule"][job_type] = cron_str
    
    # Save config
    with open(CONFIG_FILE, 'w') as f:
        json.dump(config, f, indent=4)
        
    # Update running job
    job_id = f"{job_type}_job"
    func = run_asn_job if job_type == "asn" else run_fqdn_job
    scheduler.add_job(func, trigger, id=job_id, replace_existing=True)
    
    return {"message": "Schedule updated", "type": job_type, "cron": cron_str}

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)