"""CRUD operations for user-tagged incidents and received log bundles."""
from __future__ import annotations

import json
import sqlite3
import uuid
from pathlib import Path

from app.glean.base import now_iso
from app.services.models import Incident, ReceivedBundle
from app.services.search import SearchResult, entries_in_window, search


def _row_to_incident(row: sqlite3.Row) -> Incident:
    return Incident(
        id=row["id"],
        label=row["label"],
        issue_type=row["issue_type"] if "issue_type" in row.keys() else "",
        started_at=row["started_at"],
        ended_at=row["ended_at"],
        notes=row["notes"],
        created_at=row["created_at"],
        severity=row["severity"],
    )


def _row_to_bundle(row: sqlite3.Row) -> ReceivedBundle:
    return ReceivedBundle(
        id=row["id"],
        source_host=row["source_host"],
        issue_type=row["issue_type"],
        label=row["label"],
        severity=row["severity"],
        started_at=row["started_at"],
        bundled_at=row["bundled_at"],
        entry_count=row["entry_count"],
        bundle_json=row["bundle_json"],
    )


def create_incident(
    db_path: Path,
    label: str,
    issue_type: str = "",
    started_at: str | None = None,
    ended_at: str | None = None,
    notes: str = "",
    severity: str = "medium",
) -> Incident:
    incident = Incident(
        id=str(uuid.uuid4()),
        label=label,
        issue_type=issue_type,
        started_at=started_at,
        ended_at=ended_at,
        notes=notes,
        created_at=now_iso(),
        severity=severity,
    )
    conn = sqlite3.connect(str(db_path), timeout=30.0)
    conn.execute("PRAGMA journal_mode=WAL")
    conn.execute(
        "INSERT INTO incidents (id, label, issue_type, started_at, ended_at, notes, created_at, severity) "
        "VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
        (incident.id, incident.label, incident.issue_type, incident.started_at,
         incident.ended_at, incident.notes, incident.created_at, incident.severity),
    )
    conn.commit()
    conn.close()
    return incident


def list_incidents(db_path: Path) -> list[Incident]:
    conn = sqlite3.connect(str(db_path), timeout=30.0)
    conn.execute("PRAGMA journal_mode=WAL")
    conn.row_factory = sqlite3.Row
    rows = conn.execute(
        "SELECT * FROM incidents ORDER BY created_at DESC"
    ).fetchall()
    conn.close()
    return [_row_to_incident(r) for r in rows]


def get_incident(db_path: Path, incident_id: str) -> Incident | None:
    conn = sqlite3.connect(str(db_path), timeout=30.0)
    conn.execute("PRAGMA journal_mode=WAL")
    conn.row_factory = sqlite3.Row
    row = conn.execute(
        "SELECT * FROM incidents WHERE id = ?", (incident_id,)
    ).fetchone()
    conn.close()
    return _row_to_incident(row) if row else None


def delete_incident(db_path: Path, incident_id: str) -> bool:
    conn = sqlite3.connect(str(db_path), timeout=30.0)
    conn.execute("PRAGMA journal_mode=WAL")
    cur = conn.execute("DELETE FROM incidents WHERE id = ?", (incident_id,))
    conn.commit()
    conn.close()
    return cur.rowcount > 0


def get_incident_entries(
    db_path: Path,
    incident: Incident,
    limit: int = 100,
) -> list[SearchResult]:
    """Return log entries associated with an incident's time window."""
    half = limit // 2
    common: dict = dict(since=incident.started_at, until=incident.ended_at, limit=half)

    keyword_hits = search(db_path, query=incident.label, include_repeats=False, **common)
    error_hits = search(db_path, query=incident.label, severity="ERROR", include_repeats=False, **common)
    critical_hits = search(db_path, query=incident.label, severity="CRITICAL", include_repeats=False, **common)

    seen: set[str] = set()
    combined: list[SearchResult] = []
    for entry in keyword_hits + critical_hits + error_hits:
        if entry.entry_id not in seen:
            seen.add(entry.entry_id)
            combined.append(entry)

    if len(combined) < limit:
        for entry in entries_in_window(db_path, incident.started_at, incident.ended_at, severity="ERROR", limit=half):
            if entry.entry_id not in seen:
                seen.add(entry.entry_id)
                combined.append(entry)

    if len(combined) < limit:
        for entry in entries_in_window(db_path, incident.started_at, incident.ended_at, limit=limit - len(combined)):
            if entry.entry_id not in seen:
                seen.add(entry.entry_id)
                combined.append(entry)

    combined.sort(key=lambda e: (e.timestamp_iso or "\xff", e.sequence))
    return combined[:limit]


def build_bundle(
    db_path: Path,
    incident: Incident,
    source_host: str,
    limit: int = 200,
) -> dict:
    """Assemble a labeled bundle: incident metadata + related log entries."""
    entries = get_incident_entries(db_path, incident, limit=limit)
    return {
        "bundle_version": 1,
        "source_host": source_host,
        "bundled_at": now_iso(),
        "incident": {
            "id": incident.id,
            "label": incident.label,
            "issue_type": incident.issue_type,
            "started_at": incident.started_at,
            "ended_at": incident.ended_at,
            "severity": incident.severity,
            "notes": incident.notes,
        },
        "log_entries": [
            {
                "entry_id": e.entry_id,
                "source_id": e.source_id,
                "timestamp_iso": e.timestamp_iso,
                "severity": e.severity,
                "text": e.text,
                "matched_patterns": list(e.matched_patterns),
            }
            for e in entries
        ],
    }


def store_bundle(db_path: Path, bundle: dict) -> ReceivedBundle:
    """Store an incoming bundle from a remote Turnstone instance."""
    inc = bundle.get("incident", {})
    record = ReceivedBundle(
        id=str(uuid.uuid4()),
        source_host=bundle.get("source_host", "unknown"),
        issue_type=inc.get("issue_type", ""),
        label=inc.get("label", ""),
        severity=inc.get("severity", "medium"),
        started_at=inc.get("started_at"),
        bundled_at=bundle.get("bundled_at", now_iso()),
        entry_count=len(bundle.get("log_entries", [])),
        bundle_json=json.dumps(bundle),
    )
    conn = sqlite3.connect(str(db_path), timeout=30.0)
    conn.execute("PRAGMA journal_mode=WAL")
    conn.execute(
        "INSERT INTO received_bundles "
        "(id, source_host, issue_type, label, severity, started_at, bundled_at, entry_count, bundle_json) "
        "VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)",
        (record.id, record.source_host, record.issue_type, record.label,
         record.severity, record.started_at, record.bundled_at, record.entry_count, record.bundle_json),
    )
    conn.commit()
    conn.close()
    return record


def list_bundles(db_path: Path) -> list[ReceivedBundle]:
    conn = sqlite3.connect(str(db_path), timeout=30.0)
    conn.execute("PRAGMA journal_mode=WAL")
    conn.row_factory = sqlite3.Row
    rows = conn.execute(
        "SELECT id, source_host, issue_type, label, severity, started_at, bundled_at, entry_count, bundle_json "
        "FROM received_bundles ORDER BY bundled_at DESC"
    ).fetchall()
    conn.close()
    return [_row_to_bundle(r) for r in rows]


def get_bundle(db_path: Path, bundle_id: str) -> ReceivedBundle | None:
    conn = sqlite3.connect(str(db_path), timeout=30.0)
    conn.execute("PRAGMA journal_mode=WAL")
    conn.row_factory = sqlite3.Row
    row = conn.execute(
        "SELECT * FROM received_bundles WHERE id = ?", (bundle_id,)
    ).fetchone()
    conn.close()
    return _row_to_bundle(row) if row else None