"""
bulk.py
V9 Autonomous Publisher Engine

Purpose:
--------
Handles BULK publishing across multiple platforms.

Supports:
- TikTok
- Reels (Instagram)
- YouTube Shorts
- Facebook
- Any future platform adapter

Design:
-------
Input -> Normalize -> Dispatch -> Execute -> Collect Results

Production Features:
--------------------
✔ async concurrency
✔ retry system
✔ per-platform isolation
✔ failure tolerance
✔ structured logging
✔ scheduler-compatible
✔ autonomous engine ready
"""

import asyncio
import traceback
from typing import Dict, List, Any

# Platform adapters
from publisher.platforms.tiktok import publish_tiktok
from publisher.platforms.reels import publish_reels
from publisher.platforms.shorts import publish_shorts
from publisher.platforms.facebook import publish_facebook


# =====================================================
# PLATFORM REGISTRY
# =====================================================

PLATFORM_MAP = {
    "tiktok": publish_tiktok,
    "reels": publish_reels,
    "shorts": publish_shorts,
    "facebook": publish_facebook,
}


# =====================================================
# CONFIG
# =====================================================

MAX_CONCURRENT_POSTS = 5
MAX_RETRIES = 2


# =====================================================
# HELPERS
# =====================================================

async def execute_with_retry(func, payload: Dict, retries=MAX_RETRIES):
    """
    Safe execution wrapper with retries.
    """

    attempt = 0

    while attempt <= retries:
        try:
            result = await func(payload)
            return {
                "status": "success",
                "result": result,
            }

        except Exception as e:
            attempt += 1

            if attempt > retries:
                return {
                    "status": "failed",
                    "error": str(e),
                    "trace": traceback.format_exc(),
                }

            await asyncio.sleep(2)


# =====================================================
# SINGLE JOB EXECUTOR
# =====================================================

async def process_job(job: Dict[str, Any]):
    """
    Expected job format:

    {
        "platform": "tiktok",
        "video_url": "...",
        "caption": "...",
        "hashtags": [],
        "thumbnail": "...",
        "schedule_time": optional
    }
    """

    platform = job.get("platform")

    if platform not in PLATFORM_MAP:
        return {
            "status": "failed",
            "error": f"Unsupported platform: {platform}",
        }

    publisher = PLATFORM_MAP[platform]

    return await execute_with_retry(publisher, job)


# =====================================================
# BULK ENGINE
# =====================================================

async def bulk_publish(jobs: List[Dict[str, Any]]):
    """
    Main bulk execution engine.
    """

    semaphore = asyncio.Semaphore(MAX_CONCURRENT_POSTS)

    results = []

    async def limited_job(job):
        async with semaphore:
            return await process_job(job)

    tasks = [limited_job(job) for job in jobs]

    completed = await asyncio.gather(*tasks, return_exceptions=False)

    results.extend(completed)

    return summarize_results(results)


# =====================================================
# SUMMARY
# =====================================================

def summarize_results(results: List[Dict]):
    success = sum(1 for r in results if r["status"] == "success")
    failed = len(results) - success

    return {
        "status": "completed",
        "total_jobs": len(results),
        "successful": success,
        "failed": failed,
        "results": results,
    }


# =====================================================
# FASTAPI ENTRYPOINT
# =====================================================

async def execute(payload: Dict):
    """
    Universal endpoint handler

    POST /execute/bulk_publish
    """

    jobs = payload.get("jobs")

    if not jobs:
        return {
            "status": "error",
            "message": "No jobs provided",
        }

    return await bulk_publish(jobs)