"""A readable dump of a state store, for bring-up runs and debugging.

    python -m nisse_dev.dump STATE_DB [--full]

Opens the store read-only (SQLite `mode=ro`), so it is safe to run against a
live agent's database: it never migrates, writes or locks it. Prints the work
items and which is active, pending intents, and the canonical log, one event
per line with its work item and actor; long texts are shortened unless
`--full` is given.
"""

import argparse
import json
import sqlite3
import sys
from pathlib import Path
from typing import Any

SHORT = 160  # characters of each text shown without --full


def _connect(path: Path) -> sqlite3.Connection:
    conn = sqlite3.connect(f"file:{path}?mode=ro", uri=True)
    conn.row_factory = sqlite3.Row
    return conn


def _clip(text: str, full: bool) -> str:
    text = text.replace("\n", " ⏎ ") if not full else text
    if full or len(text) <= SHORT:
        return text
    return text[:SHORT] + f" … [{len(text) - SHORT} more]"


def _event_line(kind: str, payload: dict[str, Any], full: bool) -> str:
    match kind:
        case "user_message":
            return f"USER [{payload.get('source', '')}]: {_clip(payload['text'], full)}"
        case "assistant_text":
            return f"ASSISTANT ({payload.get('model', '')}): {_clip(payload['text'], full)}"
        case "tool_call":
            args = json.dumps(payload.get("arguments", {}), ensure_ascii=False)
            return f"CALL {payload['tool']} {_clip(args, full)}"
        case "tool_result":
            mark = "ok" if payload.get("success") else "FAILED"
            return f"  result ({mark}): {_clip(str(payload.get('result', '')), full)}"
        case "plan_submitted":
            plan = payload["plan"]
            return f"PLAN ({payload.get('model', '')}, {len(plan)} chars): {_clip(plan, full)}"
        case "fact":
            return f"FACT: {_clip(payload['text'], full)}"
        case "action_verdict":
            return (
                f"  VERDICT {payload.get('effect', '')} ({payload.get('rule', '')}), "
                f"{payload.get('decision', '')}: {payload.get('reason', '')}"
            )
        case "gate_opened":
            return f"GATE {payload.get('gate', '')}: {payload.get('reason', '')}"
        case _:
            return f"{kind.upper()}: {_clip(json.dumps(payload, ensure_ascii=False), full)}"


def render(path: Path, *, full: bool = False) -> str:
    conn = _connect(path)
    lines: list[str] = []
    agent = conn.execute("SELECT * FROM agent WHERE id = 1").fetchone()
    active = agent["active_item"] if agent else None
    lines.append(f"active work item: {active or '(none: idle)'}")
    for item in conn.execute("SELECT * FROM work_items ORDER BY opened_at"):
        loop = json.loads(item["data"]).get("loop") or {}
        status = item["status"] + (f" ({item['outcome']})" if item["outcome"] else "")
        waiting = (
            f"  waits for: {loop['wait']}" if item["position"] == "WAITING" else ""
        )
        lines.append(
            f"  {item['id']}  {status}  position: {item['position']}  "
            f"scope: {item['scope']}  rev-{loop.get('rev', 0)}{waiting}"
        )
    pending = conn.execute(
        "SELECT id, kind, payload, work_item FROM intent_log WHERE status = 'pending'"
    ).fetchall()
    for row in pending:
        lines.append(
            f"pending intent #{row['id']} {row['kind']} "
            f"[{row['work_item'] or 'agent'}]: {row['payload']}"
        )
    lines.append("")
    for row in conn.execute("SELECT * FROM canonical_events ORDER BY id"):
        payload = json.loads(row["payload"])
        time = row["ts"][11:19]
        where = f"[{row['work_item'] or 'agent'}/{row['actor']}]"
        lines.append(
            f"#{row['id']} {time} {where} {_event_line(row['type'], payload, full)}"
        )
    conn.close()
    return "\n".join(lines)


def main(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
    parser.add_argument("state_db", type=Path)
    parser.add_argument("--full", action="store_true", help="don't shorten texts")
    args = parser.parse_args(argv)
    if not args.state_db.exists():
        print(f"no state store at {args.state_db}", file=sys.stderr)
        return 1
    print(render(args.state_db, full=args.full))
    return 0


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