import json
import subprocess
from pathlib import Path

import pytest

from src.views import login


ROOT = Path(__file__).resolve().parents[1]
LOGIN_JS = ROOT / "frontend" / "login.js"


def test_expired_session_reason_explains_preserved_private_work():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const status = {{ textContent: '' }};
const controller = createLoginController({{
  form: {{ reset: () => {{}} }}, status, button: {{ disabled: false }},
  fetchImpl: async () => new Response('{{}}', {{ status: 200 }}),
  location: {{ replace: () => {{}} }},
}});
controller.showReason('session-expired');
const expired = status.textContent;
controller.showReason('https://evil.example/redirect');
process.stdout.write(JSON.stringify({{ expired, ignored: status.textContent }}));
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )
    state = json.loads(result.stdout)

    assert state["expired"] == (
        "Your session expired. Private drafts remain on this device. "
        "Sign in to continue."
    )
    assert state["ignored"] == state["expired"]


def test_idle_session_reason_explains_that_saved_work_will_resume():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const status = {{ textContent: '' }};
const controller = createLoginController({{
  form: {{ reset: () => {{}} }}, status, button: {{ disabled: false }},
  fetchImpl: async () => new Response('{{}}', {{ status: 200 }}),
  location: {{ replace: () => {{}} }},
}});
controller.showReason('session-idle');
process.stdout.write(JSON.stringify({{ status: status.textContent }}));
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )

    assert json.loads(result.stdout)["status"] == (
        "Stackchain locked after inactivity. Your drafts and queued work are still "
        "on this device. Sign in to resume."
    )


def test_revoked_session_reason_clears_private_data_before_enabling_sign_in():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const state = {{cleared:false, snapshots:[]}};
const status = {{textContent:''}};
const button = {{disabled:false}};
const controller = createLoginController({{
  form:{{reset:()=>{{}}}}, status, button,
  fetchImpl:async()=>new Response('{{}}',{{status:200}}),
  location:{{replace:()=>{{}}}},
  clearPrivateDeviceData:async()=>{{
    state.snapshots.push({{status:status.textContent,disabled:button.disabled}});
    await new Promise(resolve=>setTimeout(resolve,10));
    state.cleared=true;
  }},
}});
(async()=>{{
  const pending=controller.showReason('session-revoked');
  state.snapshots.push({{status:status.textContent,disabled:button.disabled}});
  await pending;
  state.final={{status:status.textContent,disabled:button.disabled,cleared:state.cleared}};
  process.stdout.write(JSON.stringify(state));
}})().catch(error=>{{console.error(error);process.exit(1);}});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )
    state = json.loads(result.stdout)

    assert all(snapshot["disabled"] for snapshot in state["snapshots"])
    assert state["final"] == {
        "status": "This device was remotely signed out. Stackchain private data was cleared. Sign in to use it again.",
        "disabled": False,
        "cleared": True,
    }


@pytest.mark.anyio
async def test_login_loads_private_data_purger_before_controller():
    html = await login()

    assert '<script src="static/private-data-registry.js"></script>' in html
    assert '<script src="static/private-device-data.js"></script>' in html
    assert html.index('static/private-data-registry.js') < html.index('static/private-device-data.js')
    assert html.index('static/private-device-data.js') < html.index('static/login.js')


def test_revoked_session_does_not_claim_success_when_purger_is_unavailable():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const status={{textContent:''}};
const button={{disabled:false}};
const controller=createLoginController({{
  form:{{reset:()=>{{}}}},status,button,
  fetchImpl:async()=>new Response('{{}}',{{status:200}}),location:{{replace:()=>{{}}}},
}});
(async()=>{{
  await controller.showReason('session-revoked');
  process.stdout.write(JSON.stringify({{status:status.textContent,disabled:button.disabled}}));
}})();
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )

    assert json.loads(result.stdout) == {
        "status": "This device was remotely signed out, but private data could not be cleared. Close other Stackchain tabs and clear this site’s data before signing in.",
        "disabled": True,
    }


def test_rate_limited_login_disables_submit_and_counts_down():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const state = {{ reset: 0, interval: null }};
const status = {{ textContent: '' }};
const button = {{ disabled: false }};
const form = {{ reset: () => state.reset += 1 }};
const controller = createLoginController({{
  form, status, button,
  fetchImpl: async () => new Response(JSON.stringify({{ detail: 'Too many sign-in attempts' }}), {{ status: 429, headers: {{ 'Retry-After': '2' }} }}),
  location: {{ replace: () => {{}} }},
  setIntervalImpl: callback => {{ state.interval = callback; return 1; }},
  clearIntervalImpl: () => {{}},
}});
(async () => {{
  await controller.submit('never-store-this-token');
  state.initial = {{ disabled: button.disabled, status: status.textContent, reset: state.reset }};
  state.interval();
  state.afterTick = {{ disabled: button.disabled, status: status.textContent }};
  state.interval();
  state.finished = {{ disabled: button.disabled, status: status.textContent }};
  process.stdout.write(JSON.stringify(state));
}})().catch(error => {{ console.error(error); process.exit(1); }});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )
    state = json.loads(result.stdout)

    assert state["initial"] == {
        "disabled": True,
        "status": "Too many attempts. Try again in 2 seconds.",
        "reset": 1,
    }
    assert state["afterTick"]["disabled"] is True
    assert state["finished"] == {
        "disabled": False,
        "status": "You can try signing in again.",
    }


def test_stalled_token_login_aborts_once_and_restores_both_sign_in_controls():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const state = {{ requests: 0, timeout: null, aborted: false }};
const status = {{ textContent: '' }};
const button = {{ disabled: false }};
const passkeyButton = {{ disabled: false }};
const controller = createLoginController({{
  form: {{ reset: () => {{}} }}, status, button, passkeyButton,
  credentials: {{ get: async () => {{ throw new Error('unused'); }} }},
  fetchImpl: (_url, options) => {{
    state.requests += 1;
    options.signal.addEventListener('abort', () => state.aborted = true);
    return new Promise((_resolve, reject) => {{
      options.signal.addEventListener('abort', () => reject(options.signal.reason));
    }});
  }},
  location: {{ replace: () => {{}} }},
  requestTimeoutMs: 25,
  setTimeoutImpl: callback => {{ state.timeout = callback; return 7; }},
  clearTimeoutImpl: () => {{}},
}});
(async () => {{
  const first = controller.submit('operator-token');
  const duplicate = controller.submit('operator-token');
  state.during = {{ button: button.disabled, passkey: passkeyButton.disabled }};
  state.timeout();
  await Promise.all([first, duplicate]);
  state.after = {{
    button: button.disabled, passkey: passkeyButton.disabled,
    status: status.textContent,
  }};
  process.stdout.write(JSON.stringify(state));
}})().catch(error => {{ console.error(error); process.exit(1); }});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )
    state = json.loads(result.stdout)

    assert state["requests"] == 1
    assert state["during"] == {"button": True, "passkey": True}
    assert state["aborted"] is True
    assert state["after"] == {
        "button": False,
        "passkey": False,
        "status": "Sign-in timed out. Check your connection and try again.",
    }


def test_successful_login_resumes_valid_shared_capture_continuation():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const state = {{ replaced: null }};
const controller = createLoginController({{
  form: {{ reset: () => {{}} }}, status: {{ textContent: '' }}, button: {{ disabled: false }},
  fetchImpl: async () => new Response('{{}}', {{ status: 200 }}),
  location: {{ replace: value => state.replaced = value }},
  continuation: './?title=Production+crash&url=https%3A%2F%2Fexample.com',
}});
(async () => {{
  await controller.submit('operator-token');
  process.stdout.write(JSON.stringify(state));
}})().catch(error => {{ console.error(error); process.exit(1); }});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )

    assert json.loads(result.stdout)["replaced"] == (
        "./?title=Production+crash&url=https%3A%2F%2Fexample.com"
    )


def test_successful_login_resumes_only_valid_search_preview_continuation():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
async function destination(continuation) {{
  let replaced = null;
  const controller = createLoginController({{
    form: {{ reset: () => {{}} }}, status: {{ textContent: '' }}, button: {{ disabled: false }},
    fetchImpl: async () => new Response('{{}}', {{ status: 200 }}),
    location: {{ replace: value => replaced = value }}, continuation,
  }});
  await controller.submit('operator-token');
  return replaced;
}}
(async () => process.stdout.write(JSON.stringify({{
  valid:await destination('./?search=release+blocker&preview=pull%3Astackchain%2Fapi%3A9&search_kind=pull&search_state=open&search_repository=stackchain%2Fapi'),
  malformed:await destination('./?search=release&preview=issue%3Astackchain%2Fapi%3A0'),
  unknown:await destination('./?search=release&next=https%3A%2F%2Fevil.example'),
}})))().catch(error => {{ console.error(error); process.exit(1); }});
"""
    result = subprocess.run(["node", "-e", harness], capture_output=True, text=True)

    assert result.returncode == 0, result.stderr
    assert json.loads(result.stdout) == {
        "valid": "./?search=release+blocker&preview=pull%3Astackchain%2Fapi%3A9&search_kind=pull&search_state=open&search_repository=stackchain%2Fapi",
        "malformed": "./",
        "unknown": "./",
    }


def test_search_preview_login_explains_the_resumable_handoff():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const status = {{ textContent: '' }};
createLoginController({{
  form: {{ reset: () => {{}} }}, status, button: {{ disabled: false }},
  fetchImpl: async () => new Response('{{}}', {{ status: 200 }}),
  location: {{ replace: () => {{}} }},
  continuation: './?search=release&preview=issue%3Astackchain%2Fapi%3A42',
}});
process.stdout.write(status.textContent);
"""
    result = subprocess.run(["node", "-e", harness], capture_output=True, text=True)

    assert result.returncode == 0, result.stderr
    assert result.stdout == "Sign in to open the shared Search result."


def test_passkey_login_uses_web_authentication_without_sending_the_operator_token():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const requests = [];
const state = {{ replaced: null }};
const credential = {{
  id:'credential-id', type:'public-key', rawId:Uint8Array.from([1,2,3]).buffer,
  response:{{
    authenticatorData:Uint8Array.from([4]).buffer,
    clientDataJSON:Uint8Array.from([5]).buffer,
    signature:Uint8Array.from([6]).buffer,
    userHandle:null,
  }},
}};
const controller = createLoginController({{
  form:{{reset:()=>{{}}}}, status:{{textContent:''}}, button:{{disabled:false}},
  passkeyButton:{{disabled:false}},
  credentials:{{get:async options=>{{ state.publicKey=options.publicKey; return credential; }}}},
  fetchImpl:async (url, options={{}})=>{{
    requests.push({{url, body:options.body ? JSON.parse(options.body) : null}});
    if (url.endsWith('/options')) return new Response(JSON.stringify({{
      challenge:'AQID', rpId:'forge.example', userVerification:'required',
      allowCredentials:[{{type:'public-key',id:'BAUG'}}],
    }}),{{status:200,headers:{{'Content-Type':'application/json'}}}});
    return new Response('{{}}',{{status:200}});
  }},
  location:{{replace:value=>state.replaced=value}},
}});
(async()=>{{
  await controller.signInWithPasskey('Timmy’s Pixel');
  process.stdout.write(JSON.stringify({{requests,state}}));
}})().catch(error=>{{console.error(error);process.exit(1);}});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )
    output = json.loads(result.stdout)

    assert output["state"]["publicKey"]["challenge"] == {"0": 1, "1": 2, "2": 3}
    assert output["state"]["replaced"] == "./"
    assert output["requests"][1]["url"] == "api/v1/passkeys/authentication/verify"
    assert output["requests"][1]["body"] == {
        "challenge": "AQID",
        "credential": {
            "id": "credential-id",
            "type": "public-key",
            "rawId": "AQID",
            "response": {
                "authenticatorData": "BA",
                "clientDataJSON": "BQ",
                "signature": "Bg",
                "userHandle": None,
            },
        },
        "device_label": "Timmy’s Pixel",
        "action": "sign_in",
        "target": "dashboard",
    }
    assert "access_token" not in json.dumps(output)


def test_stalled_passkey_network_phases_time_out_without_timing_out_biometrics():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
async function scenario(stalledPhase) {{
  const state = {{ requests: [], timers: [], credentialCalls: 0 }};
  const status = {{textContent:''}};
  const button = {{disabled:false}};
  const passkeyButton = {{disabled:false}};
  const credential = {{
    id:'credential-id', type:'public-key', rawId:Uint8Array.from([1]).buffer,
    response:{{authenticatorData:Uint8Array.from([2]).buffer,
      clientDataJSON:Uint8Array.from([3]).buffer,
      signature:Uint8Array.from([4]).buffer,userHandle:null}},
  }};
  const controller=createLoginController({{
    form:{{reset:()=>{{}}}},status,button,passkeyButton,
    credentials:{{get:async()=>{{state.credentialCalls+=1;return credential;}}}},
    fetchImpl:(url,options)=>{{
      state.requests.push(url);
      const phase=url.endsWith('/options') ? 'options' : 'verify';
      if (phase === stalledPhase) return new Promise((_resolve,reject)=>{{
        options.signal.addEventListener('abort',()=>reject(options.signal.reason));
      }});
      return Promise.resolve(new Response(JSON.stringify({{
        challenge:'AQID',allowCredentials:[]
      }}),{{status:200,headers:{{'Content-Type':'application/json'}}}}));
    }},
    location:{{replace:()=>{{}}}},requestTimeoutMs:25,
    setTimeoutImpl:callback=>{{state.timers.push(callback);return state.timers.length;}},
    clearTimeoutImpl:()=>{{}},
  }});
  const pending=controller.signInWithPasskey('Phone');
  await new Promise(resolve=>setImmediate(resolve));
  if (stalledPhase === 'verify') await new Promise(resolve=>setImmediate(resolve));
  state.timers.at(-1)();
  state.result=await pending;
  state.final={{status:status.textContent,button:button.disabled,passkey:passkeyButton.disabled}};
  return state;
}}
(async()=>{{
  process.stdout.write(JSON.stringify({{
    options:await scenario('options'),verify:await scenario('verify'),
  }}));
}})().catch(error=>{{console.error(error);process.exit(1);}});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )
    state = json.loads(result.stdout)

    assert state["options"]["credentialCalls"] == 0
    assert state["verify"]["credentialCalls"] == 1
    assert state["verify"]["timers"] == [None, None]
    for phase in ("options", "verify"):
        assert state[phase]["result"] is False
        assert state[phase]["final"] == {
            "status": "Passkey sign-in timed out. Check your connection and try again.",
            "button": False,
            "passkey": False,
        }


def test_login_sends_a_bounded_device_label_with_the_access_token():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
let request = null;
const controller = createLoginController({{
  form: {{ reset: () => {{}} }}, status: {{ textContent: '' }}, button: {{ disabled: false }},
  fetchImpl: async (url, options) => {{ request = {{url, body: JSON.parse(options.body)}}; return new Response('{{}}', {{ status: 200 }}); }},
  location: {{ replace: () => {{}} }},
}});
(async () => {{
  await controller.submit('operator-token', 'Timmy’s Pixel');
  process.stdout.write(JSON.stringify(request));
}})().catch(error => {{ console.error(error); process.exit(1); }});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )

    assert json.loads(result.stdout) == {
        "url": "api/v1/session",
        "body": {"access_token": "operator-token", "device_label": "Timmy’s Pixel"},
    }


def test_shared_capture_login_explains_why_sign_in_is_required():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
const status = {{ textContent: '' }};
createLoginController({{
  form: {{ reset: () => {{}} }}, status, button: {{ disabled: false }},
  fetchImpl: async () => new Response('{{}}', {{ status: 200 }}),
  location: {{ replace: () => {{}} }}, continuation: './?title=Shared',
}});
process.stdout.write(status.textContent);
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )

    assert result.stdout == "Sign in to continue your shared capture."


def test_login_rejects_untrusted_or_non_share_continuations():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
async function destination(continuation) {{
  let replaced = null;
  const controller = createLoginController({{
    form: {{ reset: () => {{}} }}, status: {{ textContent: '' }}, button: {{ disabled: false }},
    fetchImpl: async () => new Response('{{}}', {{ status: 200 }}),
    location: {{ replace: value => replaced = value }}, continuation,
  }});
  await controller.submit('operator-token');
  return replaced;
}}
(async () => {{
  process.stdout.write(JSON.stringify({{
    crossOrigin: await destination('https://evil.example/steal'),
    otherRoute: await destination('./settings?title=Shared'),
    extraField: await destination('./?title=Shared&next=https%3A%2F%2Fevil.example'),
    prototypeField: await destination('./?toString=Shared'),
    oversized: await destination('./?title=' + 'x'.repeat(201)),
  }}));
}})().catch(error => {{ console.error(error); process.exit(1); }});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )

    assert json.loads(result.stdout) == {
        "crossOrigin": "./",
        "otherRoute": "./",
        "extraField": "./",
        "prototypeField": "./",
        "oversized": "./",
    }


def test_login_bootstrap_continues_shared_capture_after_submit():
    harness = f"""
const fs = require('fs');
const vm = require('vm');
const state = {{ replaced: null, submit: null }};
const elements = {{
  'sign-in': {{ reset: () => {{}}, addEventListener: (_name, handler) => state.submit = handler }},
  'status': {{ textContent: '' }},
  'submit-sign-in': {{ disabled: false }},
}};
const context = {{
  URLSearchParams, Response, AbortController, setInterval, clearInterval, setTimeout, clearTimeout,
  FormData: function () {{ return {{ get: () => 'operator-token' }}; }},
  fetch: async () => new Response('{{}}', {{ status: 200 }}),
  document: {{ getElementById: id => elements[id] }},
  window: {{ location: {{
    search: '?continue=.%2F%3Ftitle%3DShared%2Blink%26url%3Dhttps%253A%252F%252Fexample.com',
    replace: value => state.replaced = value,
  }} }},
}};
context.fetch.bind = Function.prototype.bind;
vm.createContext(context);
vm.runInContext(fs.readFileSync({json.dumps(str(LOGIN_JS))}, 'utf8'), context);
state.submit({{ preventDefault: () => {{}} }});
setTimeout(() => process.stdout.write(JSON.stringify({{
  replaced: state.replaced, status: elements.status.textContent,
}})), 0);
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )

    assert json.loads(result.stdout) == {
        "replaced": "./?title=Shared+link&url=https%3A%2F%2Fexample.com",
        "status": "Signing in…",
    }


def test_login_continues_only_bounded_shared_screenshot_capture():
    harness = f"""
const createLoginController = require({json.dumps(str(LOGIN_JS))});
async function destination(continuation) {{
  let replaced = null;
  const controller = createLoginController({{
    form: {{ reset: () => {{}} }}, status: {{ textContent: '' }}, button: {{ disabled: false }},
    fetchImpl: async () => new Response('{{}}', {{ status: 200 }}),
    location: {{ replace: value => replaced = value }}, continuation,
  }});
  await controller.submit('operator-token');
  return replaced;
}}
(async () => {{
  process.stdout.write(JSON.stringify({{
    valid: await destination('./?title=Broken&launch=new&shared=image'),
    wrongLaunch: await destination('./?launch=agenda&shared=image'),
    missingLaunch: await destination('./?shared=image'),
    wrongMarker: await destination('./?launch=new&shared=document'),
    duplicateMarker: await destination('./?launch=new&shared=image&shared=image'),
    launchWithoutMarker: await destination('./?launch=new'),
  }}));
}})().catch(error => {{ console.error(error); process.exit(1); }});
"""
    result = subprocess.run(
        ["node", "-e", harness], text=True, capture_output=True, check=True
    )

    assert json.loads(result.stdout) == {
        "valid": "./?title=Broken&launch=new&shared=image",
        "wrongLaunch": "./",
        "missingLaunch": "./",
        "wrongMarker": "./",
        "duplicateMarker": "./",
        "launchWithoutMarker": "./?launch=new",
    }


@pytest.mark.anyio
async def test_login_page_loads_rate_limit_controller():
    html = await login()

    assert '<script src="static/login.js"></script>' in html
    assert "main{box-sizing:border-box" in html
    assert '<p id="status" role="status" aria-live="polite"></p>' in html
    assert 'name="device_label"' in html
    assert 'maxlength="64"' in html