#!/usr/bin/env python3
"""Drive one real transfer through the test HTTP adapter."""

from __future__ import annotations

import argparse
import json
import sys
import time
import urllib.parse
import urllib.request


CONTROL = "http://127.0.0.1:18081/test/v1"
INFO_HASH = "330be0cb7c2201135a2de63b28e77993745ff688"
LOGICAL_BYTES = 31


def get_json(url: str):
    with urllib.request.urlopen(url, timeout=5) as response:
        return json.load(response)


def post_json(url: str, value: object):
    encoded = json.dumps(value, separators=(",", ":")).encode()
    request = urllib.request.Request(
        url,
        data=encoded,
        method="POST",
        headers={"Content-Type": "application/json"},
    )
    with urllib.request.urlopen(request, timeout=5) as response:
        return json.load(response)


def qb_json(endpoint: str, path: str, **parameters: str):
    query = urllib.parse.urlencode(parameters)
    suffix = f"?{query}" if query else ""
    return get_json(f"{endpoint}{path}{suffix}")


def wait_for(predicate, timeout: float, detail: str):
    deadline = time.monotonic() + timeout
    last = None
    while time.monotonic() < deadline:
        try:
            last = predicate()
            if last:
                return last
        except (OSError, ValueError, KeyError, IndexError) as exc:
            last = f"{type(exc).__name__}: {exc}"
        time.sleep(0.5)
    raise RuntimeError(f"timed out waiting for {detail}; last={last!r}")


def qb_resource_is_complete(endpoint: str):
    records = qb_json(endpoint, "/torrents/info", hashes=INFO_HASH)
    if len(records) != 1 or float(records[0].get("progress", 0)) < 1:
        return None
    files = qb_json(endpoint, "/torrents/files", hash=INFO_HASH)
    if (
        len(files) != 1
        or float(files[0].get("progress", 0)) < 1
        or int(files[0].get("priority", 0)) <= 0
    ):
        return None
    return records[0]


def ready_route(cache_client: str, archive_client: str):
    for route in get_json(f"{CONTROL}/routes"):
        if (
            route["cache_client_id"] == cache_client
            and route["archive_client_id"] == archive_client
            and route["state"] == "ready"
        ):
            return route
    return None


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--operation", choices=("archive", "unarchive"), required=True
    )
    parser.add_argument("--source-client", required=True)
    parser.add_argument("--target-client", required=True)
    parser.add_argument("--source-qb", required=True)
    parser.add_argument("--target-qb", required=True)
    parser.add_argument("--cache-client", required=True)
    parser.add_argument("--archive-client", required=True)
    args = parser.parse_args()

    wait_for(
        lambda: qb_resource_is_complete(args.source_qb),
        60,
        "source qBittorrent verification",
    )
    route = wait_for(
        lambda: ready_route(args.cache_client, args.archive_client),
        60,
        f"{args.cache_client}/{args.archive_client} route",
    )
    preview = post_json(f"{CONTROL}/jobs/preview", {
        "operation": args.operation,
        "source_client_id": args.source_client,
        "target_client_id": args.target_client,
        "resource_id": {"info_hash_v1_hex": INFO_HASH},
    })
    definition = preview["definition"]
    job_id = definition["job_id"]
    created = post_json(f"{CONTROL}/jobs", {
        "preview_revision": preview["preview_revision"],
        "definition": definition,
    })
    if created["job_id"] != job_id:
        raise RuntimeError("control returned the wrong job")

    def finished_job():
        job = get_json(f"{CONTROL}/jobs/{job_id}")
        if job["state"] == "JOB_STATE_FAILED":
            raise RuntimeError(f"{args.operation} job failed: {job}")
        if job["state"] == "JOB_STATE_SUCCEEDED" and job["committed"]:
            return job
        return None

    job = wait_for(finished_job, 180, f"committed {args.operation} job")
    wait_for(
        lambda: qb_resource_is_complete(args.target_qb),
        30,
        "target qBittorrent placement",
    )
    if qb_resource_is_complete(args.source_qb) is None:
        raise RuntimeError(
            f"{args.operation} transfer did not retain its source placement"
        )
    print(json.dumps({
        "operation": args.operation,
        "job_id": job_id,
        "state": job["state"],
        "committed": job["committed"],
        "route_id": route["route_id"],
        "source_retained": True,
        "target_verified": True,
    }, sort_keys=True))
    return 0


if __name__ == "__main__":
    try:
        raise SystemExit(main())
    except Exception as exc:
        print(f"transfer happy-path failed: {exc}", file=sys.stderr)
        raise