import json
import subprocess
from pathlib import Path

import pytest

from src.views import dashboard


ROOT = Path(__file__).parents[1]
COORDINATOR = ROOT / "frontend" / "outbox-coordinator.js"
ISSUE_OUTBOX = ROOT / "frontend" / "issue-outbox.js"
AUTHORED_OUTBOX = ROOT / "frontend" / "authored-outbox.js"


def run_node(script: str):
    result = subprocess.run(["node", "-e", script], check=True, capture_output=True, text=True)
    return json.loads(result.stdout)


def test_two_tabs_share_one_flush_lease_for_each_outbox():
    script = f"""
const createCoordinator = require({json.dumps(str(COORDINATOR))});
const createIssueOutbox = require({json.dumps(str(ISSUE_OUTBOX))});
const createAuthoredOutbox = require({json.dumps(str(AUTHORED_OUTBOX))});
const values = new Map();
const storage = {{getItem:k=>values.get(k)||null,setItem:(k,v)=>values.set(k,v),removeItem:k=>values.delete(k)}};
const held = new Set();
const locks = {{request: async (name, options, work) => {{
  if (held.has(name)) return work(null);
  held.add(name);
  try {{ return await work({{name}}); }} finally {{ held.delete(name); }}
}}}};
let releaseIssue, releaseMessage;
const issueGate = new Promise(resolve => releaseIssue = resolve);
const messageGate = new Promise(resolve => releaseMessage = resolve);
let issueCalls = 0, messageCalls = 0;
const issueA = createIssueOutbox({{storage,getOwnerLogin:()=> 'timmy',createOperationId:()=> 'issue-1',
  coordinator:createCoordinator({{storage,locks,channelFactory:null,tabId:'a'}}),fetchJson:async()=>{{issueCalls++;await issueGate;return {{number:1}};}}}});
const issueB = createIssueOutbox({{storage,getOwnerLogin:()=> 'timmy',
  coordinator:createCoordinator({{storage,locks,channelFactory:null,tabId:'b'}}),fetchJson:async()=>{{issueCalls++;return {{number:1}};}}}});
issueA.enqueue({{repository:'o/r',title:'One'}});
const messageA = createAuthoredOutbox({{storage,getOwnerLogin:()=> 'timmy',
  coordinator:createCoordinator({{storage,locks,channelFactory:null,tabId:'a'}}),fetchJson:async()=>{{messageCalls++;await messageGate;return {{id:1}};}}}});
const messageB = createAuthoredOutbox({{storage,getOwnerLogin:()=> 'timmy',
  coordinator:createCoordinator({{storage,locks,channelFactory:null,tabId:'b'}}),fetchJson:async()=>{{messageCalls++;return {{id:1}};}}}});
messageA.enqueue({{kind:'issue-comment',repository:'o/r',number:1,body:'Reply',operationId:'message-1'}});
(async()=>{{
  const issueFirst=issueA.flush('timmy'); const issueSecond=issueB.retry('issue-1', 'timmy');
  const messageFirst=messageA.flush('timmy'); const messageSecond=messageB.retry('message-1', 'timmy');
  await Promise.resolve();
  releaseIssue(); releaseMessage();
  const results=await Promise.all([issueFirst,issueSecond,messageFirst,messageSecond]);
  process.stdout.write(JSON.stringify({{issueCalls,messageCalls,results,issueRemaining:issueA.list(),messageRemaining:messageA.list()}}));
}})();
"""
    output = run_node(script)

    assert output["issueCalls"] == 1
    assert output["messageCalls"] == 1
    assert output["issueRemaining"] == []
    assert output["messageRemaining"] == []
    assert sum(result.get("lease_skipped", False) for result in output["results"]) == 2


def test_fallback_lease_expires_and_stale_owner_cannot_release_successor():
    script = f"""
const createCoordinator = require({json.dumps(str(COORDINATOR))});
const values = new Map();
const storage = {{getItem:k=>values.get(k)||null,setItem:(k,v)=>values.set(k,v),removeItem:k=>values.delete(k)}};
let clock=100;
let releaseFirst;
const firstGate=new Promise(resolve=>releaseFirst=resolve);
const first=createCoordinator({{storage,locks:null,channelFactory:null,tabId:'first',now:()=>clock,leaseMs:50}});
const second=createCoordinator({{storage,locks:null,channelFactory:null,tabId:'second',now:()=>clock,leaseMs:50}});
(async()=>{{
  const running=first.runExclusive('issue', async()=>{{await firstGate;return 'first-done';}});
  await Promise.resolve();
  const blocked=await second.runExclusive('issue', async()=> 'too-early');
  clock=151;
  const takeover=await second.runExclusive('issue', async()=> 'taken-over');
  releaseFirst();
  const original=await running;
  const after=await second.runExclusive('issue', async()=> 'after-release');
  process.stdout.write(JSON.stringify({{blocked,takeover,original,after,lease:storage.getItem('stackchain.outbox-lease.issue.v1')}}));
}})();
"""
    output = run_node(script)

    assert output["blocked"]["lease_skipped"] is True
    assert output["takeover"] == "taken-over"
    assert output["original"] == "first-done"
    assert output["after"] == "after-release"
    assert output["lease"] is None


def test_queue_change_notifications_cross_tabs_and_can_unsubscribe():
    script = f"""
const createCoordinator = require({json.dumps(str(COORDINATOR))});
const values = new Map();
const storage = {{getItem:k=>values.get(k)||null,setItem:(k,v)=>values.set(k,v),removeItem:k=>values.delete(k)}};
const channels=[];
function channelFactory() {{
  const channel={{onmessage:null,postMessage(message){{channels.filter(x=>x!==channel).forEach(x=>x.onmessage?.({{data:message}}));}},close(){{}}}};
  channels.push(channel); return channel;
}}
const first=createCoordinator({{storage,channelFactory,tabId:'first'}});
const second=createCoordinator({{storage,channelFactory,tabId:'second'}});
const seen=[];
const unsubscribe=second.subscribe(change=>seen.push(change));
first.notify('issue');
first.notify('authored');
unsubscribe();
first.notify('issue');
process.stdout.write(JSON.stringify({{seen,signal:JSON.parse(storage.getItem('stackchain.outbox-change.v1'))}}));
"""
    output = run_node(script)

    assert [change["queue"] for change in output["seen"]] == ["issue", "authored"]
    assert output["signal"]["queue"] == "issue"
    assert output["signal"]["tabId"] == "first"


@pytest.mark.anyio
async def test_dashboard_wires_cross_tab_draft_refresh_and_precaches_coordinator():
    html = await dashboard()
    worker = (ROOT / "frontend" / "service-worker.js").read_text()

    assert '<script src="static/outbox-coordinator.js"></script>' in html
    assert "const outboxCoordinator = createOutboxCoordinator" in html
    assert "coordinator: outboxCoordinator" in html
    assert "outboxCoordinator.subscribe" in html
    assert "refreshMyWorkView()" in html
    assert "BASE + 'static/outbox-coordinator.js'" in worker