"""
Cliente para Meta Marketing API.
Documentación: https://developers.facebook.com/docs/marketing-api
SDK: facebook-business
"""
from facebook_business.api import FacebookAdsApi
from facebook_business.adobjects.adaccount import AdAccount
from facebook_business.adobjects.campaign import Campaign
import config
from datetime import datetime


class MetaAdsClient:
    def __init__(self):
        FacebookAdsApi.init(
            app_id=config.META_APP_ID,
            app_secret=config.META_APP_SECRET,
            access_token=config.META_ACCESS_TOKEN,
        )
        self.account = AdAccount(config.META_AD_ACCOUNT_ID)

    def get_monthly_metrics_all(self) -> dict:
        """
        Métricas del mes en curso para todas las campañas activas.
        Retorna dict {campaign_id: {spend, impressions, clicks, ctr, cpm, leads, cpl, status, name}}.
        """
        now = datetime.now()
        date_start = f"{now.year}-{now.month:02d}-01"
        date_end   = now.strftime("%Y-%m-%d")

        campaigns = self.account.get_campaigns(fields=[
            Campaign.Field.id,
            Campaign.Field.name,
            Campaign.Field.status,
            Campaign.Field.effective_status,
        ], params={"effective_status": ["ACTIVE", "PAUSED"]})

        result = {}
        for c in campaigns:
            cid  = c["id"]
            name = c["name"]
            status = c.get("effective_status", "UNKNOWN")

            insights = c.get_insights(fields=[
                "spend", "impressions", "clicks", "ctr", "cpm",
                "actions",       # conversiones por tipo (lead, purchase, etc.)
                "cost_per_action_type",
            ], params={
                "time_range": {"since": date_start, "until": date_end},
                "level": "campaign",
            })

            spend = impressions = clicks = ctr = cpm = leads = 0.0
            if insights:
                row = insights[0]
                spend       = float(row.get("spend", 0))
                impressions = int(row.get("impressions", 0))
                clicks      = int(row.get("clicks", 0))
                ctr         = float(row.get("ctr", 0))
                cpm         = float(row.get("cpm", 0))
                for action in row.get("actions", []):
                    if action["action_type"] in ("lead", "onsite_conversion.lead_grouped"):
                        leads += float(action["value"])

            cpl = round(spend / leads, 2) if leads > 0 else 0.0
            result[cid] = {
                "campaign_id": cid,
                "name":        name,
                "status":      status,
                "spend":       round(spend, 2),
                "impressions": impressions,
                "clicks":      clicks,
                "ctr":         round(ctr, 4),
                "cpm":         round(cpm, 2),
                "leads":       int(leads),
                "cpl":         cpl,
            }
        return result