"""Session recording API endpoints."""

from __future__ import annotations

import json
from pathlib import Path

from flask import Blueprint, request, send_file

from utils.recording import RECORDING_ROOT, get_recording_manager
from utils.responses import api_error, api_success

recordings_bp = Blueprint("recordings", __name__, url_prefix="/recordings")


@recordings_bp.route("/start", methods=["POST"])
def start_recording():
    data = request.get_json() or {}
    mode = (data.get("mode") or "").strip()
    if not mode:
        return api_error("mode is required", 400)

    label = data.get("label")
    metadata = data.get("metadata") if isinstance(data.get("metadata"), dict) else {}

    manager = get_recording_manager()
    session = manager.start_recording(mode=mode, label=label, metadata=metadata)

    return api_success(
        data={
            "session": {
                "id": session.id,
                "mode": session.mode,
                "label": session.label,
                "started_at": session.started_at.isoformat(),
                "file_path": str(session.file_path),
            }
        }
    )


@recordings_bp.route("/stop", methods=["POST"])
def stop_recording():
    data = request.get_json() or {}
    mode = data.get("mode")
    session_id = data.get("id")

    manager = get_recording_manager()
    session = manager.stop_recording(mode=mode, session_id=session_id)
    if not session:
        return api_error("No active recording found", 404)

    return api_success(
        data={
            "session": {
                "id": session.id,
                "mode": session.mode,
                "label": session.label,
                "started_at": session.started_at.isoformat(),
                "stopped_at": session.stopped_at.isoformat() if session.stopped_at else None,
                "event_count": session.event_count,
                "size_bytes": session.size_bytes,
                "file_path": str(session.file_path),
            }
        }
    )


@recordings_bp.route("", methods=["GET"])
def list_recordings():
    manager = get_recording_manager()
    limit = request.args.get("limit", default=50, type=int)
    return api_success(
        data={
            "recordings": manager.list_recordings(limit=limit),
            "active": manager.get_active(),
        }
    )


@recordings_bp.route("/<session_id>", methods=["GET"])
def get_recording(session_id: str):
    manager = get_recording_manager()
    rec = manager.get_recording(session_id)
    if not rec:
        return api_error("Recording not found", 404)
    return api_success(data={"recording": rec})


@recordings_bp.route("/<session_id>/download", methods=["GET"])
def download_recording(session_id: str):
    manager = get_recording_manager()
    rec = manager.get_recording(session_id)
    if not rec:
        return api_error("Recording not found", 404)

    file_path = Path(rec["file_path"])
    try:
        resolved_root = RECORDING_ROOT.resolve()
        resolved_file = file_path.resolve()
        if resolved_root not in resolved_file.parents:
            return api_error("Invalid recording path", 400)
    except Exception:
        return api_error("Invalid recording path", 400)

    if not file_path.exists():
        return api_error("Recording file missing", 404)

    return send_file(
        file_path,
        mimetype="application/x-ndjson",
        as_attachment=True,
        download_name=file_path.name,
    )


@recordings_bp.route("/<session_id>/events", methods=["GET"])
def get_recording_events(session_id: str):
    """Return parsed events from a recording for in-app replay."""
    manager = get_recording_manager()
    rec = manager.get_recording(session_id)
    if not rec:
        return api_error("Recording not found", 404)

    file_path = Path(rec["file_path"])
    try:
        resolved_root = RECORDING_ROOT.resolve()
        resolved_file = file_path.resolve()
        if resolved_root not in resolved_file.parents:
            return api_error("Invalid recording path", 400)
    except Exception:
        return api_error("Invalid recording path", 400)

    if not file_path.exists():
        return api_error("Recording file missing", 404)

    limit = max(1, min(5000, request.args.get("limit", default=500, type=int)))
    offset = max(0, request.args.get("offset", default=0, type=int))

    events: list[dict] = []
    seen = 0
    with file_path.open("r", encoding="utf-8", errors="replace") as fh:
        for idx, line in enumerate(fh):
            if idx < offset:
                continue
            if seen >= limit:
                break
            line = line.strip()
            if not line:
                continue
            try:
                events.append(json.loads(line))
                seen += 1
            except json.JSONDecodeError:
                continue

    return api_success(
        data={
            "recording": {
                "id": rec["id"],
                "mode": rec["mode"],
                "started_at": rec["started_at"],
                "stopped_at": rec["stopped_at"],
                "event_count": rec["event_count"],
            },
            "offset": offset,
            "limit": limit,
            "returned": len(events),
            "events": events,
        }
    )