#!/usr/bin/env python3
"""
job-dispatch.py: Dispatch a job by sending a DM to an agent.

Usage:
    job-dispatch.py <job_name> [--dry-run]

Reads /home/super/Projects/NetVM/jobs/<job_name>.json,
renders the prompt template, sends DM via dm.py, logs to job-log.jsonl.

Part of the JOB system (see docs/JOB-SPEC.md).
"""

import sys
import os
import json
import subprocess
import uuid
from datetime import datetime, timezone
from pathlib import Path

# Paths
NETVM_ROOT = Path("/home/super/Projects/NetVM")
JOBS_DIR = NETVM_ROOT / "jobs"
DM_PY = NETVM_ROOT / "bin" / "dm.py"
JOB_LOG = NETVM_ROOT / "job-log.jsonl"

# Add bin to path for rate_limiter
sys.path.insert(0, str(NETVM_ROOT / "bin"))
try:
    from rate_limiter import rate_limit_wait
    HAS_RATE_LIMITER = True
except ImportError:
    HAS_RATE_LIMITER = False

def log_event(event_type, data):
    """Append event to job-log.jsonl"""
    entry = {
        "ts": datetime.now(timezone.utc).isoformat(),
        "type": event_type,
        **data
    }
    with open(JOB_LOG, "a") as f:
        f.write(json.dumps(entry) + "\n")

def load_job(job_name):
    """Load job JSON definition"""
    # Try .json first, then .yaml (for compatibility)
    job_file = JOBS_DIR / f"{job_name}.json"
    if not job_file.exists():
        job_file = JOBS_DIR / f"{job_name}.yaml"
        if not job_file.exists():
            print(f"Error: Job '{job_name}' not found in {JOBS_DIR}", file=sys.stderr)
            sys.exit(1)
        print(f"Warning: YAML not supported (no PyYAML). Convert {job_file} to JSON.", file=sys.stderr)
        sys.exit(1)
    
    with open(job_file) as f:
        return json.load(f)

def render_prompt(template, variables):
    """Render prompt template with variables"""
    # Simple {var} substitution
    result = template
    for key, value in variables.items():
        result = result.replace(f"{{{key}}}", str(value))
    return result

def send_dm(agent, target, message, dry_run=False):
    """Send DM via dm.py"""
    if dry_run:
        print(f"[DRY RUN] Would send to {agent} ({target}):")
        print(message[:200] + "..." if len(message) > 200 else message)
        return "dry-run-id"
    
    # Rate limit
    if HAS_RATE_LIMITER:
        rate_limit_wait(agent)
    
    cmd = [str(DM_PY), "send", "--agent", "opm", "--to", agent, 
           "--target", target, message]
    result = subprocess.run(cmd, capture_output=True, text=True, timeout=60)
    
    if result.returncode != 0:
        print(f"DM send failed: {result.stderr}", file=sys.stderr)
        return None
    
    # Extract message ID from output (format: SENT [id])
    # dm.py prints the ID on success
    output = result.stdout.strip()
    # Try to parse ID from output
    return output

def main():
    if len(sys.argv) < 2:
        print(f"Usage: {sys.argv[0]} <job_name> [--dry-run]", file=sys.stderr)
        sys.exit(1)
    
    job_name = sys.argv[1]
    dry_run = "--dry-run" in sys.argv
    
    # Load job
    job = load_job(job_name)
    
    # Generate job_id
    job_id = f"{job_name}-{datetime.now(timezone.utc).strftime('%Y%m%d-%H%M%S')}-{uuid.uuid4().hex[:8]}"
    
    # Variables for template
    variables = {
        "job_id": job_id,
        "job_name": job_name,
        "date": datetime.now(timezone.utc).strftime("%Y-%m-%d"),
        "datetime": datetime.now(timezone.utc).isoformat(),
    }
    
    # Render prompt
    prompt_template = job.get("prompt_template", "")
    if not prompt_template:
        print(f"Error: Job '{job_name}' has no prompt_template", file=sys.stderr)
        sys.exit(1)
    
    rendered = render_prompt(prompt_template, variables)
    
    # Format as JOB DM
    dm_message = f"[JOB {job_id}] {rendered}"
    
    # Get target
    agent = job.get("agent", "muse")
    sidechat_cfg = job.get("sidechat", {})
    
    if sidechat_cfg.get("create", False):
        # TODO: Create sidechat and get name
        # For now, just note it in the DM
        target = "main"
        dm_message += f"\n\n[Sidechat: {sidechat_cfg.get('name_template', 'job-'+job_name)}]"
    else:
        target = "main"
    
    # Log job_sent
    log_event("job_sent", {
        "job_id": job_id,
        "job_name": job_name,
        "agent": agent,
        "target": target,
        "dry_run": dry_run,
    })
    
    # Send DM
    msg_id = send_dm(agent, target, dm_message, dry_run=dry_run)
    
    if msg_id and not dry_run:
        print(f"Dispatched job {job_id} to {agent} (DM: {msg_id})")
        log_event("job_dispatched", {
            "job_id": job_id,
            "dm_id": msg_id,
        })
    elif dry_run:
        print(f"[DRY RUN] Job {job_id} would be dispatched to {agent}")
    else:
        print(f"Failed to dispatch job {job_id}", file=sys.stderr)
        log_event("job_failed", {
            "job_id": job_id,
            "error": "dm_send_failed",
        })
        sys.exit(1)

if __name__ == "__main__":
    main()