"""
Space Keeper v4 - Keeps HuggingFace Spaces alive during hackathon evaluation
"""

import os
import json
from concurrent.futures import ThreadPoolExecutor, as_completed
from datetime import datetime, timezone
from pathlib import Path
import threading

import gradio as gr
import requests
from huggingface_hub import HfApi
from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.triggers.interval import IntervalTrigger

# =============================================================================
# CONFIGURATION
# =============================================================================
ORG_NAME = os.environ.get("ORG_NAME", "MCP-1st-Birthday")
PING_INTERVAL_HOURS = int(os.environ.get("PING_INTERVAL_HOURS", "12"))
REQUEST_TIMEOUT = int(os.environ.get("REQUEST_TIMEOUT", "30"))
PARALLEL_REQUESTS = int(os.environ.get("PARALLEL_REQUESTS", "10"))
HF_TOKEN = os.environ.get("HF_TOKEN", None)

LOG_FILE = Path("run_logs.json")
MAX_LOG_ENTRIES = 100

# =============================================================================
# GLOBAL STATE
# =============================================================================
scheduler = BackgroundScheduler()
api = HfApi(token=HF_TOKEN) if HF_TOKEN else HfApi()
APP_START_TIME = datetime.now(timezone.utc)
log_lock = threading.Lock()


# =============================================================================
# LOGGING FUNCTIONS
# =============================================================================
def load_logs() -> list:
    with log_lock:
        if LOG_FILE.exists():
            try:
                with open(LOG_FILE, "r") as f:
                    return json.load(f)
            except Exception:
                return []
        return []


def save_logs(logs: list):
    with log_lock:
        logs = logs[-MAX_LOG_ENTRIES:]
        with open(LOG_FILE, "w") as f:
            json.dump(logs, f, indent=2)


# =============================================================================
# PING FUNCTIONS
# =============================================================================
def ping_space(space_id: str) -> dict:
    """Ping a single Space and return the result."""
    org, name = space_id.split("/")
    app_url = f"https://{org.lower()}-{name.lower()}.hf.space"
    hf_page_url = f"https://huggingface.co/spaces/{space_id}"
    
    try:
        response = requests.get(app_url, timeout=REQUEST_TIMEOUT)
        return {
            "space_id": space_id,
            "status": "success",
            "status_code": response.status_code,
            "url_pinged": app_url,
            "error": None
        }
    except requests.Timeout:
        return {
            "space_id": space_id,
            "status": "timeout",
            "status_code": None,
            "url_pinged": app_url,
            "error": f"Timed out after {REQUEST_TIMEOUT}s"
        }
    except Exception as e:
        try:
            response = requests.get(hf_page_url, timeout=REQUEST_TIMEOUT)
            return {
                "space_id": space_id,
                "status": "success",
                "status_code": response.status_code,
                "url_pinged": hf_page_url,
                "error": None
            }
        except Exception:
            return {
                "space_id": space_id,
                "status": "error",
                "status_code": None,
                "url_pinged": app_url,
                "error": str(e)
            }


def scheduled_job():
    """Wrapper for the scheduled job."""
    print(f"[{datetime.now(timezone.utc).isoformat()}] Running scheduled ping job...")
    
    start_time = datetime.now(timezone.utc)
    
    try:
        spaces = list(api.list_spaces(author=ORG_NAME))
    except Exception as e:
        run_result = {
            "timestamp": start_time.isoformat(),
            "triggered_by": "scheduler",
            "status": "error",
            "error": f"Failed to list Spaces: {str(e)}",
            "total_spaces": 0,
            "successful": 0,
            "failed": 0,
            "duration_seconds": 0,
            "private_spaces": [],
            "results": []
        }
        logs = load_logs()
        logs.append(run_result)
        save_logs(logs)
        return
    
    # Separate private and public spaces
    private_space_names = [s.id.split("/")[1] for s in spaces if getattr(s, 'private', False)]
    space_ids = [space.id for space in spaces]
    results = []
    
    with ThreadPoolExecutor(max_workers=PARALLEL_REQUESTS) as executor:
        future_to_space = {executor.submit(ping_space, sid): sid for sid in space_ids}
        for future in as_completed(future_to_space):
            results.append(future.result())
    
    end_time = datetime.now(timezone.utc)
    duration = (end_time - start_time).total_seconds()
    
    successful = sum(1 for r in results if r["status"] == "success")
    failed = len(results) - successful
    
    run_result = {
        "timestamp": start_time.isoformat(),
        "triggered_by": "scheduler",
        "status": "completed",
        "error": None,
        "total_spaces": len(results),
        "successful": successful,
        "failed": failed,
        "duration_seconds": round(duration, 2),
        "private_spaces": private_space_names,
        "results": results
    }
    
    logs = load_logs()
    logs.append(run_result)
    save_logs(logs)
    print(f"[{end_time.isoformat()}] Completed: {successful}/{len(results)} successful in {duration:.1f}s")


# =============================================================================
# UI HELPER FUNCTIONS
# =============================================================================
def get_uptime() -> str:
    delta = datetime.now(timezone.utc) - APP_START_TIME
    hours, remainder = divmod(int(delta.total_seconds()), 3600)
    minutes, seconds = divmod(remainder, 60)
    if hours > 0:
        return f"{hours}h {minutes}m"
    elif minutes > 0:
        return f"{minutes}m {seconds}s"
    return f"{seconds}s"


def get_next_run_time() -> str:
    jobs = scheduler.get_jobs()
    if jobs and jobs[0].next_run_time:
        return jobs[0].next_run_time.strftime('%Y-%m-%d %H:%M:%S UTC')
    return "Not scheduled"


def get_stats() -> dict:
    logs = load_logs()
    if not logs:
        return {"total_runs": 0, "last_run": "Never", "last_run_status": "N/A"}
    
    last_run = logs[-1]
    return {
        "total_runs": len(logs),
        "last_run": last_run["timestamp"],
        "last_run_status": "✅ Success" if last_run.get("failed", 0) == 0 else f"⚠️ {last_run.get('failed', 0)} failed",
        "last_run_spaces": last_run.get("total_spaces", 0)
    }


def format_status_panel() -> str:
    stats = get_stats()
    token_status = "✅ Set (can see private Spaces)" if HF_TOKEN else "❌ Not set (only public Spaces visible)"
    
    return f"""## ⚙️ Configuration

| Setting | Value |
|---------|-------|
| **Organization** | `{ORG_NAME}` |
| **Ping Interval** | Every {PING_INTERVAL_HOURS} hours |
| **Parallel Requests** | {PARALLEL_REQUESTS} at once |
| **Request Timeout** | {REQUEST_TIMEOUT}s |
| **HF Token** | {token_status} |

## 📊 Statistics

| Metric | Value |
|--------|-------|
| **App Uptime** | {get_uptime()} |
| **Total Runs** | {stats['total_runs']} |
| **Last Run** | {stats['last_run']} |

## ⏰ Next Scheduled Run
**{get_next_run_time()}**
"""


def format_logs_panel() -> str:
    logs = load_logs()
    
    if not logs:
        return "## 📜 Run History\n\n*No runs yet. Click **🚀 Run Now** to start!*"
    
    output = "## 📜 Run History (most recent first)\n\n"
    
    for run in reversed(logs[-15:]):
        ts = run["timestamp"]
        by = run["triggered_by"]
        
        if run["status"] == "error":
            output += f"❌ **{ts}** | {by} | Error: {run['error']}\n\n"
        else:
            emoji = "✅" if run["failed"] == 0 else "⚠️"
            private_count = len(run.get("private_spaces", []))
            private_info = f" | 🔒 {private_count} private" if private_count > 0 else ""
            
            output += f"{emoji} **{ts}** | {by} | "
            output += f"**{run['total_spaces']}** spaces | "
            output += f"{run['successful']} ok, {run['failed']} failed{private_info} | "
            output += f"{run['duration_seconds']}s\n"
            
            if run["failed"] > 0:
                failed_names = [r["space_id"].split("/")[1] for r in run.get("results", []) if r["status"] != "success"][:5]
                output += f"   ↳ Failed: `{'`, `'.join(failed_names)}`"
                if run["failed"] > 5:
                    output += f" +{run['failed']-5} more"
                output += "\n"
            output += "\n"
    
    return output


def format_private_spaces_accordion(private_spaces: list) -> str:
    """Format the private spaces list for the accordion."""
    if not private_spaces:
        return "*No private Spaces found in this run.*"
    
    output = f"**{len(private_spaces)} private Spaces** were pinged:\n\n"
    
    # Create columns for better readability
    for i, name in enumerate(sorted(private_spaces)):
        output += f"- `{name}`\n"
    
    return output


# =============================================================================
# MAIN RUN FUNCTION WITH LIVE PROGRESS
# =============================================================================
def manual_trigger_with_progress():
    """Manually trigger a ping run with live progress updates."""
    
    yield (
        "## 🔄 Starting...\n\nFetching Space list from HuggingFace API...", 
        format_status_panel(), 
        format_logs_panel(),
        "*Run in progress...*"
    )
    
    start_time = datetime.now(timezone.utc)
    
    # Get spaces from API
    try:
        spaces = list(api.list_spaces(author=ORG_NAME))
    except Exception as e:
        error_msg = f"## ❌ Failed\n\nCould not list Spaces: {str(e)}"
        run_result = {
            "timestamp": start_time.isoformat(),
            "triggered_by": "manual",
            "status": "error",
            "error": str(e),
            "total_spaces": 0,
            "successful": 0,
            "failed": 0,
            "duration_seconds": 0,
            "private_spaces": [],
            "results": []
        }
        logs = load_logs()
        logs.append(run_result)
        save_logs(logs)
        yield error_msg, format_status_panel(), format_logs_panel(), "*Error during run*"
        return
    
    # Separate private and public spaces
    private_spaces = []
    public_spaces = []
    for s in spaces:
        name = s.id.split("/")[1]
        if getattr(s, 'private', False):
            private_spaces.append(name)
        else:
            public_spaces.append(name)
    
    space_ids = [space.id for space in spaces]
    total = len(space_ids)
    
    info_msg = f"## 🔄 Running...\n\n"
    info_msg += f"**Found {total} Spaces** ({len(public_spaces)} public, {len(private_spaces)} private)\n\n"
    info_msg += f"Pinging {PARALLEL_REQUESTS} Spaces in parallel...\n\n"
    info_msg += f"`[0/{total}]` ░░░░░░░░░░ 0%"
    
    yield info_msg, format_status_panel(), format_logs_panel(), format_private_spaces_accordion(private_spaces)
    
    # Run pings
    results = []
    completed = 0
    successful = 0
    failed = 0
    
    with ThreadPoolExecutor(max_workers=PARALLEL_REQUESTS) as executor:
        future_to_space = {executor.submit(ping_space, sid): sid for sid in space_ids}
        
        for future in as_completed(future_to_space):
            result = future.result()
            results.append(result)
            completed += 1
            
            if result["status"] == "success":
                successful += 1
            else:
                failed += 1
            
            pct = int((completed / total) * 100)
            filled = int(pct / 10)
            bar = "█" * filled + "░" * (10 - filled)
            
            status_emoji = "✅" if result["status"] == "success" else "❌"
            space_name = result["space_id"].split("/")[1]
            
            live_status = f"""## 🔄 Running...

**Progress:** `[{completed}/{total}]` {bar} {pct}%

**Last:** {status_emoji} `{space_name}` {'— ' + result.get('error', '') if result['status'] != 'success' else ''}

**Running total:** ✅ {successful} successful, ❌ {failed} failed
"""
            
            if completed % 5 == 0 or completed == total:
                yield live_status, format_status_panel(), format_logs_panel(), format_private_spaces_accordion(private_spaces)
    
    # Save results
    end_time = datetime.now(timezone.utc)
    duration = (end_time - start_time).total_seconds()
    
    run_result = {
        "timestamp": start_time.isoformat(),
        "triggered_by": "manual",
        "status": "completed",
        "error": None,
        "total_spaces": total,
        "successful": successful,
        "failed": failed,
        "duration_seconds": round(duration, 2),
        "private_spaces": private_spaces,
        "results": results
    }
    
    logs = load_logs()
    logs.append(run_result)
    save_logs(logs)
    
    # Final summary
    if failed == 0:
        final = f"""## ✅ Completed Successfully!

**Pinged {total} Spaces** ({len(public_spaces)} public, {len(private_spaces)} private) in {duration:.1f}s

All Spaces responded! 🎉
"""
    else:
        failed_spaces = [r for r in results if r["status"] != "success"]
        failed_list = "\n".join([f"- `{r['space_id'].split('/')[1]}` — {r.get('error', 'Unknown error')}" for r in failed_spaces[:10]])
        if len(failed_spaces) > 10:
            failed_list += f"\n- ... and {len(failed_spaces) - 10} more"
        
        final = f"""## ⚠️ Completed with {failed} issue(s)

**Pinged {total} Spaces** ({len(public_spaces)} public, {len(private_spaces)} private) in {duration:.1f}s

✅ {successful} successful  
❌ {failed} failed

### Failed Spaces:
{failed_list}

---
*Failures usually mean the Space is paused, has an error, or uses a non-standard SDK.*
"""
    
    yield final, format_status_panel(), format_logs_panel(), format_private_spaces_accordion(private_spaces)


def refresh_all():
    # Get private spaces from last run if available
    logs = load_logs()
    private_spaces = []
    if logs:
        private_spaces = logs[-1].get("private_spaces", [])
    return format_status_panel(), format_logs_panel(), format_private_spaces_accordion(private_spaces)


# =============================================================================
# GRADIO UI
# =============================================================================
with gr.Blocks() as demo:
    gr.Markdown("""# 🔄 Space Keeper
Keeps HuggingFace Spaces alive by pinging them to prevent sleeping during hackathon evaluation.
""")
    
    with gr.Row():
        with gr.Column(scale=1):
            status_panel = gr.Markdown(format_status_panel())
            with gr.Row():
                run_btn = gr.Button("🚀 Run Now", variant="primary", size="lg")
                refresh_btn = gr.Button("🔄 Refresh", size="lg")
        
        with gr.Column(scale=1):
            live_output = gr.Markdown("## Ready\n\nClick **🚀 Run Now** to ping all Spaces.\n\nAuto-runs every 12 hours when this Space is awake.")
    
    gr.Markdown("---")
    
    with gr.Accordion("🔒 Private Spaces", open=False):
        private_spaces_display = gr.Markdown("*Run a ping to see private Spaces list.*")
    
    logs_panel = gr.Markdown(format_logs_panel())
    
    run_btn.click(
        fn=manual_trigger_with_progress, 
        outputs=[live_output, status_panel, logs_panel, private_spaces_display]
    )
    refresh_btn.click(
        fn=refresh_all, 
        outputs=[status_panel, logs_panel, private_spaces_display]
    )


# =============================================================================
# START SCHEDULER
# =============================================================================
scheduler.add_job(
    scheduled_job,
    trigger=IntervalTrigger(hours=PING_INTERVAL_HOURS),
    id="ping_job",
    name="Ping all Spaces",
    replace_existing=True
)
scheduler.start()

print(f"[{APP_START_TIME.isoformat()}] Space Keeper started for {ORG_NAME}")
print(f"  Ping interval: {PING_INTERVAL_HOURS}h | Next run: {get_next_run_time()}")

if __name__ == "__main__":
    demo.launch()