#!/usr/bin/env python3
"""Materialize and validate the bounded context packet for one Web task."""

from __future__ import annotations

import argparse
import json
import sys
from pathlib import Path

from web_context import CURRENT, context_manifest, write_context_manifest, write_context_summary


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("task_id", nargs="?", help="task card id; defaults to active_task")
    parser.add_argument("--output", type=Path, help="optional manifest path")
    args = parser.parse_args()
    if args.task_id:
        task_id = args.task_id
    else:
        state = json.loads((CURRENT / "task-state.json").read_text(encoding="utf-8"))
        task_id = state.get("active_task")
    if not task_id:
        parser.error("no active task; pass a task id")
    try:
        manifest = context_manifest(task_id)
    except (KeyError, FileNotFoundError, json.JSONDecodeError) as exc:
        print(f"CONTEXT PACKET FAILED: {exc}")
        return 1
    output = write_context_manifest(task_id, args.output, manifest=manifest)
    summary = write_context_summary(task_id, manifest=manifest)
    limits = manifest["budget"]
    totals = manifest["totals"]
    over = []
    if totals["bytes"] > limits["total_bytes_limit"]:
        over.append("total bytes")
    if totals["evidence_bytes"] > limits["evidence_bytes_limit"]:
        over.append("evidence bytes")
    if totals["evidence_files"] > limits["evidence_file_limit"]:
        over.append("evidence file count")
    print(
        f"CONTEXT PACKET {'FAILED' if over else 'READY'}: {task_id}; "
        f"{totals['bytes']}B/{limits['total_bytes_limit']}B, "
        f"~{totals['estimated_tokens']} tokens, "
        f"{totals['evidence_files']} evidence files; manifest={output}; summary={summary}"
    )
    if over:
        print("- exceeds: " + ", ".join(over))
        return 1
    for item in manifest["excluded"]:
        print(f"- excluded: {item['path']} ({item['reason']})")
    return 0


if __name__ == "__main__":
    sys.exit(main())