import { currentRequestId, runWithRequestId, subscribeLogs } from '@snowluma/common/logger';
import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import path from 'node:path';
import { describe, expect, it, vi } from 'vitest';
import type { AdapterStatus } from '../src/network';
import type { OneBotInstance } from '../src/instance';
import {
    OneBotManager,
    parseSessionReleaseDeadlineMs,
    resolveSessionReleaseDeadlineMs,
    type DatabaseMigrationCallbacks,
    type DatabaseMigrationTask,
} from '../src/manager';
import { makeDefaultOneBotConfig } from '../src/config';
import { estimateRemainingSeconds } from '../src/message-store-migration-task';

function fakeBridge(warmup?: Promise<{ friendsLoaded: boolean; groupsLoaded: boolean }>) {
    return {
        activePid: null,
        identity: { nickname: 'test' },
        whenRosterWarmupSettled: () =>
            warmup ?? Promise.resolve({ friendsLoaded: false, groupsLoaded: false }),
    };
}

function fakeInstance(
    uin: string,
    dispose: () => Promise<unknown>,
    statuses: AdapterStatus[] = [],
    quiesce: () => void = () => {},
): OneBotInstance {
    return {
        uin,
        nickname: `retiring-${uin}`,
        quiesce,
        dispose,
        emitBotStatus: vi.fn(async () => undefined),
        getConnectionStatuses: () => statuses,
    } as unknown as OneBotInstance;
}

describe('session release deadline', () => {
    it('keeps 10 seconds when nothing overrides it', () => {
        expect(resolveSessionReleaseDeadlineMs(undefined, undefined)).toBe(10_000);
        expect(resolveSessionReleaseDeadlineMs(undefined, '   ')).toBe(10_000);
    });

    it('lets SNOWLUMA_SESSION_RELEASE_DEADLINE_MS override a configured deadline', () => {
        expect(resolveSessionReleaseDeadlineMs(30, '2500')).toBe(2500);
        expect(parseSessionReleaseDeadlineMs('0')).toBeUndefined();
        expect(parseSessionReleaseDeadlineMs('-5')).toBeUndefined();
        expect(parseSessionReleaseDeadlineMs('1.5')).toBeUndefined();
        expect(parseSessionReleaseDeadlineMs('nope')).toBeUndefined();
    });

    it('ignores an unusable environment value and keeps the configured deadline', () => {
        expect(resolveSessionReleaseDeadlineMs(30, 'nope')).toBe(30);
        expect(resolveSessionReleaseDeadlineMs(undefined, 'nope')).toBe(10_000);
    });
});

describe('database migration estimates', () => {
    it('waits for measured throughput and reaches zero on completion', () => {
        expect(
            estimateRemainingSeconds({ phase: 'migrating', processed: 200, total: 1_000 }, null),
        ).toBeNull();
        expect(
            estimateRemainingSeconds({ phase: 'migrating', processed: 200, total: 1_000 }, 125),
        ).toBe(7);
        expect(
            estimateRemainingSeconds({ phase: 'complete', processed: 1_000, total: 1_000 }, null),
        ).toBe(0);
    });
});

describe('OneBotManager database preparation', () => {
    it('releases its session subscription before shutdown and cannot bind after disposal', async () => {
        const first = vi.fn();
        const second = vi.fn();
        const source = {
            subscribeSessions: vi.fn().mockReturnValueOnce(first).mockReturnValueOnce(second),
        };
        const manager = new OneBotManager();
        manager.bind(source);
        manager.bind(source);
        expect(first).toHaveBeenCalledOnce();
        expect(second).not.toHaveBeenCalled();

        const disposed = manager.dispose();
        expect(second).toHaveBeenCalledOnce();
        await disposed;
        await manager.dispose();
        manager.bind(source);

        expect(second).toHaveBeenCalledOnce();
        expect(source.subscribeSessions).toHaveBeenCalledTimes(2);
    });

    it.each(['logout', 'dispose'] as const)(
        'invalidates migration callbacks before cancelling the task on %s',
        async (reason) => {
            vi.useFakeTimers();
            let callbacks!: DatabaseMigrationCallbacks;
            const cancel = vi.fn(() => {
                callbacks.onFailed(new Error('cancelled task'));
                callbacks.onProgress({ phase: 'complete', processed: 1, total: 1 }, 100);
            });
            const createTask = vi.fn(() => ({
                start: (next: DatabaseMigrationCallbacks) => {
                    callbacks = next;
                },
                beginMigration: vi.fn(),
                cancel,
            }));
            const manager = new OneBotManager({ createDatabaseMigrationTask: createTask });
            const lifecycle = manager as unknown as {
                onSessionStarted(uin: string, bridge: never): void;
                onSessionClosed(uin: string): void;
            };

            try {
                lifecycle.onSessionStarted('10001', fakeBridge() as never);

                if (reason === 'logout') {
                    lifecycle.onSessionClosed('10001');
                } else {
                    await manager.dispose();
                }

                expect(manager.getConnectionStatuses()).toEqual([]);
                expect(cancel).toHaveBeenCalledOnce();
                vi.advanceTimersByTime(10_000);
                expect(createTask).toHaveBeenCalledOnce();
            } finally {
                await manager.dispose();
                vi.useRealTimers();
            }
        },
    );

    it('detaches migration and network startup from the login operation', () => {
        let callbacks!: DatabaseMigrationCallbacks;
        const observedRequestIds: Array<number | undefined> = [];
        const task: DatabaseMigrationTask = {
            beginMigration: vi.fn(() => observedRequestIds.push(currentRequestId())),
            cancel: vi.fn(),
            start: vi.fn((next) => {
                observedRequestIds.push(currentRequestId());
                callbacks = next;
            }),
        };
        const instance = {
            ...fakeInstance('10001', async () => undefined),
            waitUntilNetworkReady: vi.fn(() => {
                observedRequestIds.push(currentRequestId());
                return new Promise(() => undefined);
            }),
            startLoginHistorySync: vi.fn(),
        } as unknown as OneBotInstance;
        const manager = new OneBotManager({
            createDatabaseMigrationTask: () => task,
            createInstance: () => {
                observedRequestIds.push(currentRequestId());
                return instance;
            },
        });
        let startListener!: (uin: string, bridge: never) => void;
        manager.bind({
            subscribeSessions: (listener) => {
                startListener = listener.started!;
                return vi.fn();
            },
        });
        const bridge = fakeBridge(new Promise(() => undefined));

        runWithRequestId(5201, () => startListener('10001', bridge as never));
        callbacks.onReady();

        expect(observedRequestIds).toEqual([undefined, undefined, undefined, undefined]);
    });

    it('surfaces preparation as unavailable and ignores a stale completion after logout', async () => {
        let callbacks!: DatabaseMigrationCallbacks;
        const cancel = vi.fn();
        const task: DatabaseMigrationTask = {
            beginMigration: vi.fn(),
            cancel,
            start: vi.fn((next) => {
                callbacks = next;
            }),
        };
        const manager = new OneBotManager({
            createDatabaseMigrationTask: () => task,
            createInstance: () => {
                throw new Error('stale preparation started an account');
            },
        });
        const internals = manager as unknown as {
            onSessionStarted(uin: string, bridge: never): void;
            onSessionClosed(uin: string): void;
        };

        internals.onSessionStarted('10001', {} as never);
        expect(manager.getConnectionStatuses()).toEqual([
            {
                uin: '10001',
                nickname: '10001',
                adapters: [],
                databaseMigration: {
                    phase: 'preparing',
                    usable: false,
                    processed: 0,
                    total: null,
                    progress: null,
                    estimatedRemainingSeconds: null,
                },
            },
        ]);

        internals.onSessionClosed('10001');
        callbacks.onReady();
        await Promise.resolve();

        expect(cancel).toHaveBeenCalledOnce();
        expect(manager.getInstance('10001')).toBeNull();
        expect(manager.getConnectionStatuses()).toEqual([]);
    });

    it('starts migration only after the account instance is available', async () => {
        const originalCwd = process.cwd();
        const root = mkdtempSync(path.join(tmpdir(), 'snowluma-manager-lifecycle-'));
        process.chdir(root);
        let callbacks!: DatabaseMigrationCallbacks;
        let instanceCreated = false;
        const beginMigration = vi.fn(() => {
            expect(instanceCreated).toBe(true);
        });
        const instance = {
            ...fakeInstance('10001', async () => undefined),
            waitUntilNetworkReady: vi.fn(async () => ({
                applied: true,
                statuses: [],
                errors: [],
            })),
            startLoginHistorySync: vi.fn(),
        } as unknown as OneBotInstance;
        const manager = new OneBotManager({
            createDatabaseMigrationTask: () => ({
                beginMigration,
                cancel: vi.fn(),
                start: (next) => {
                    callbacks = next;
                },
            }),
            createInstance: (_uin, _bridge, _config, _globalSettings) => {
                instanceCreated = true;
                return instance;
            },
        });

        try {
            const bridge = fakeBridge();
            (
                manager as unknown as { onSessionStarted(uin: string, bridge: never): void }
            ).onSessionStarted('10001', bridge as never);
            callbacks.onReady();

            expect(beginMigration).toHaveBeenCalledOnce();
            expect(manager.getInstance('10001')).not.toBeNull();
            await vi.waitFor(() => {
                expect(instance.emitBotStatus).toHaveBeenCalledWith('online');
            });
        } finally {
            await manager.dispose();
            process.chdir(originalCwd);
            rmSync(root, { recursive: true, force: true });
        }
    });

    it('retries when starting the database task fails synchronously', () => {
        vi.useFakeTimers();

        try {
            const tasks: DatabaseMigrationTask[] = [];
            const manager = new OneBotManager({
                createDatabaseMigrationTask: () => {
                    const task: DatabaseMigrationTask = {
                        beginMigration: vi.fn(),
                        cancel: vi.fn(),
                        start: vi.fn(() => {
                            throw new Error('private worker detail');
                        }),
                    };
                    tasks.push(task);
                    return task;
                },
            });
            const internals = manager as unknown as {
                onSessionStarted(uin: string, bridge: never): void;
                onSessionClosed(uin: string): void;
            };
            const bridge = fakeBridge();

            expect(() => internals.onSessionStarted('10001', bridge as never)).not.toThrow();
            expect(tasks[0].cancel).toHaveBeenCalledOnce();
            expect(manager.getConnectionStatuses()[0].databaseMigration).toMatchObject({
                phase: 'failed',
                usable: false,
                error: '数据库迁移失败：private worker detail；将自动重试',
            });

            vi.advanceTimersByTime(5_000);
            expect(tasks).toHaveLength(2);
            expect(tasks[1].start).toHaveBeenCalledOnce();
            internals.onSessionClosed('10001');
        } finally {
            vi.useRealTimers();
        }
    });

    it('keeps the account usable when beginning migration fails', () => {
        vi.useFakeTimers();

        try {
            let callbacks!: DatabaseMigrationCallbacks;
            const tasks: DatabaseMigrationTask[] = [];
            const instance = {
                ...fakeInstance('10001', async () => undefined),
                waitUntilNetworkReady: vi.fn(async () => ({
                    applied: true,
                    statuses: [],
                    errors: [],
                })),
                startLoginHistorySync: vi.fn(),
            } as unknown as OneBotInstance;
            const manager = new OneBotManager({
                createDatabaseMigrationTask: () => {
                    const task: DatabaseMigrationTask = {
                        beginMigration: vi.fn(() => {
                            throw new Error('private signal detail');
                        }),
                        cancel: vi.fn(),
                        start: vi.fn((next) => {
                            callbacks = next;
                        }),
                    };
                    tasks.push(task);
                    return task;
                },
                createInstance: () => instance,
            });
            const internals = manager as unknown as {
                onSessionStarted(uin: string, bridge: never): void;
                onSessionClosed(uin: string): void;
            };
            const bridge = fakeBridge();

            internals.onSessionStarted('10001', bridge as never);
            expect(() => callbacks.onReady()).not.toThrow();
            expect(tasks[0].cancel).toHaveBeenCalledOnce();
            expect(manager.getInstance('10001')).toBe(instance);
            expect(manager.getConnectionStatuses()[0].databaseMigration).toMatchObject({
                phase: 'failed',
                usable: true,
                error: '数据库迁移失败：private signal detail；将自动重试',
            });

            vi.advanceTimersByTime(5_000);
            expect(tasks).toHaveLength(2);
            internals.onSessionClosed('10001');
        } finally {
            vi.useRealTimers();
        }
    });

    it('retries when account startup fails after database preparation', () => {
        vi.useFakeTimers();

        try {
            const callbacks: DatabaseMigrationCallbacks[] = [];
            const tasks: DatabaseMigrationTask[] = [];
            const manager = new OneBotManager({
                createDatabaseMigrationTask: () => {
                    const task: DatabaseMigrationTask = {
                        beginMigration: vi.fn(),
                        cancel: vi.fn(),
                        start: vi.fn((next) => {
                            callbacks.push(next);
                        }),
                    };
                    tasks.push(task);
                    return task;
                },
                createInstance: () => {
                    throw new Error('private startup detail');
                },
            });
            const internals = manager as unknown as {
                onSessionStarted(uin: string, bridge: never): void;
                onSessionClosed(uin: string): void;
            };
            const bridge = fakeBridge();

            internals.onSessionStarted('10001', bridge as never);
            expect(() => callbacks[0].onReady()).not.toThrow();
            expect(tasks[0].cancel).toHaveBeenCalledOnce();
            expect(tasks[0].beginMigration).not.toHaveBeenCalled();
            expect(manager.getInstance('10001')).toBeNull();
            expect(manager.getConnectionStatuses()[0].databaseMigration).toMatchObject({
                phase: 'failed',
                usable: false,
                error: '账号启动失败：private startup detail；将自动重试',
            });

            vi.advanceTimersByTime(5_000);
            expect(tasks).toHaveLength(2);
            expect(tasks[1].start).toHaveBeenCalledOnce();
            internals.onSessionClosed('10001');
        } finally {
            vi.useRealTimers();
        }
    });

    it('reports invalid account configuration and stops retrying after database readiness', async () => {
        const originalCwd = process.cwd();
        const root = mkdtempSync(path.join(tmpdir(), 'snowluma-invalid-startup-'));
        const entries: string[] = [];
        const unsubscribe = subscribeLogs((entry) => entries.push(entry.message));
        let callbacks!: DatabaseMigrationCallbacks;
        const cancel = vi.fn();
        const beginMigration = vi.fn();
        const createTask = vi.fn(() => ({
            start: (next: DatabaseMigrationCallbacks) => {
                callbacks = next;
            },
            cancel,
            beginMigration,
        }));
        const createInstance = vi.fn();
        const manager = new OneBotManager({
            createDatabaseMigrationTask: createTask,
            createInstance,
        });
        vi.useFakeTimers();

        try {
            process.chdir(root);
            mkdirSync('config');
            const config = makeDefaultOneBotConfig();
            config.networks.wsServers[0].port = config.networks.httpServers[0].port;
            config.networks.wsServers[0].host = config.networks.httpServers[0].host;
            writeFileSync('config/onebot_10001.json', JSON.stringify(config));
            (
                manager as unknown as { onSessionStarted(uin: string, bridge: never): void }
            ).onSessionStarted('10001', fakeBridge() as never);
            callbacks.onReady();
            const state = manager.getConnectionStatuses()[0].databaseMigration!;
            expect(state).toMatchObject({ phase: 'failed', usable: false });
            expect(state.error).toContain('账号启动失败');
            expect(state.error).toContain('conflicts with');
            expect(
                entries.some(
                    (message) =>
                        message.includes('session startup failed') &&
                        message.includes('OneBotConfigValidationError') &&
                        message.includes('conflicts with'),
                ),
            ).toBe(true);
            expect(createInstance).not.toHaveBeenCalled();
            expect(beginMigration).not.toHaveBeenCalled();
            expect(cancel).toHaveBeenCalledOnce();
            vi.advanceTimersByTime(60_000);
            expect(createTask).toHaveBeenCalledOnce();
        } finally {
            await manager.dispose();
            unsubscribe();
            vi.useRealTimers();
            process.chdir(originalCwd);
            rmSync(root, { recursive: true, force: true });
        }
    });

    it('retries a failed database task while the session remains present', async () => {
        vi.useFakeTimers();

        try {
            const callbacks: DatabaseMigrationCallbacks[] = [];
            const tasks: DatabaseMigrationTask[] = [];
            const manager = new OneBotManager({
                createDatabaseMigrationTask: () => {
                    const task: DatabaseMigrationTask = {
                        beginMigration: vi.fn(),
                        cancel: vi.fn(),
                        start: vi.fn((next) => {
                            callbacks.push(next);
                        }),
                    };
                    tasks.push(task);
                    return task;
                },
            });
            const internals = manager as unknown as {
                onSessionStarted(uin: string, bridge: never): void;
                onSessionClosed(uin: string): void;
            };

            internals.onSessionStarted('10001', {} as never);
            callbacks[0].onFailed(new Error('private detail'));
            expect(manager.getConnectionStatuses()[0].databaseMigration).toMatchObject({
                phase: 'failed',
                usable: false,
                error: '数据库迁移失败：private detail；将自动重试',
            });
            const failed = manager.getConnectionStatuses()[0].databaseMigration;
            callbacks[0].onProgress({ phase: 'complete', processed: 10, total: 10 }, 100);
            callbacks[0].onFailed(new Error('duplicate failure'));
            expect(manager.getConnectionStatuses()[0].databaseMigration).toBe(failed);
            expect(tasks[0].cancel).toHaveBeenCalledOnce();

            vi.advanceTimersByTime(5_000);
            expect(tasks).toHaveLength(2);
            expect(tasks[1].start).toHaveBeenCalledOnce();
            const preparing = manager.getConnectionStatuses()[0].databaseMigration;
            callbacks[0].onProgress({ phase: 'complete', processed: 10, total: 10 }, 100);
            callbacks[0].onFailed(new Error('obsolete task failure'));
            expect(manager.getConnectionStatuses()[0].databaseMigration).toBe(preparing);
            expect(tasks[1].cancel).not.toHaveBeenCalled();

            internals.onSessionClosed('10001');
            callbacks[1].onFailed(new Error('late failure'));
            vi.advanceTimersByTime(5_000);
            expect(tasks).toHaveLength(2);
        } finally {
            vi.useRealTimers();
        }
    });
});

describe('OneBotManager login history sync', () => {
    async function withTempCwd(run: () => Promise<void>): Promise<void> {
        const originalCwd = process.cwd();
        const root = mkdtempSync(path.join(tmpdir(), 'snowluma-manager-history-'));
        process.chdir(root);

        try {
            await run();
        } finally {
            process.chdir(originalCwd);
            rmSync(root, { recursive: true, force: true });
        }
    }

    function preparingManager(instance: OneBotInstance) {
        let callbacks!: DatabaseMigrationCallbacks;
        const manager = new OneBotManager({
            createDatabaseMigrationTask: () => ({
                beginMigration: vi.fn(),
                cancel: vi.fn(),
                start: (next) => {
                    callbacks = next;
                },
            }),
            createInstance: () => instance,
        });
        return {
            manager,
            ready: () => callbacks.onReady(),
        };
    }

    it('does not start history sync when roster warmup is incomplete', async () => {
        await withTempCwd(async () => {
            const instance = {
                ...fakeInstance('10001', async () => undefined),
                waitUntilNetworkReady: vi.fn(async () => ({
                    applied: true,
                    statuses: [],
                    errors: [],
                })),
                startLoginHistorySync: vi.fn(),
            } as unknown as OneBotInstance;
            const { manager, ready } = preparingManager(instance);

            try {
                (
                    manager as unknown as { onSessionStarted(uin: string, bridge: never): void }
                ).onSessionStarted('10001', fakeBridge() as never);
                ready();
                await Promise.resolve();
                await Promise.resolve();
                expect(instance.startLoginHistorySync).not.toHaveBeenCalled();
            } finally {
                await manager.dispose();
            }
        });
    });

    it('starts history sync only after the instance is usable and warmup has both lists', async () => {
        await withTempCwd(async () => {
            let settleWarmup!: (result: { friendsLoaded: boolean; groupsLoaded: boolean }) => void;
            const warmup = new Promise<{ friendsLoaded: boolean; groupsLoaded: boolean }>(
                (resolve) => {
                    settleWarmup = resolve;
                },
            );
            const instance = {
                ...fakeInstance('10001', async () => undefined),
                waitUntilNetworkReady: vi.fn(async () => ({
                    applied: true,
                    statuses: [],
                    errors: [],
                })),
                startLoginHistorySync: vi.fn(),
            } as unknown as OneBotInstance;
            const { manager, ready } = preparingManager(instance);

            try {
                (
                    manager as unknown as { onSessionStarted(uin: string, bridge: never): void }
                ).onSessionStarted('10001', fakeBridge(warmup) as never);
                ready();
                await Promise.resolve();
                expect(instance.startLoginHistorySync).not.toHaveBeenCalled();
                settleWarmup({ friendsLoaded: true, groupsLoaded: true });
                await vi.waitFor(() => {
                    expect(instance.startLoginHistorySync).toHaveBeenCalledOnce();
                });
            } finally {
                await manager.dispose();
            }
        });
    });

    it('starts history sync when warmup finished before the instance became usable', async () => {
        await withTempCwd(async () => {
            const instance = {
                ...fakeInstance('10001', async () => undefined),
                waitUntilNetworkReady: vi.fn(async () => ({
                    applied: true,
                    statuses: [],
                    errors: [],
                })),
                startLoginHistorySync: vi.fn(),
            } as unknown as OneBotInstance;
            const { manager, ready } = preparingManager(instance);

            try {
                (
                    manager as unknown as { onSessionStarted(uin: string, bridge: never): void }
                ).onSessionStarted(
                    '10001',
                    fakeBridge(
                        Promise.resolve({
                            friendsLoaded: true,
                            groupsLoaded: true,
                        }),
                    ) as never,
                );
                expect(instance.startLoginHistorySync).not.toHaveBeenCalled();
                ready();
                await vi.waitFor(() => {
                    expect(instance.startLoginHistorySync).toHaveBeenCalledOnce();
                });
            } finally {
                await manager.dispose();
            }
        });
    });
});

describe('OneBotManager lifecycle failure accounting', () => {
    it('quiesces active instances before waiting for pending lifecycle work', async () => {
        const manager = new OneBotManager();
        let finishLifecycle!: () => void;
        const lifecycleGate = new Promise<void>((resolve) => {
            finishLifecycle = resolve;
        });
        const quiesce = vi.fn();
        const dispose = vi.fn(async () => ({ closed: true, errors: [] }));
        const instance = fakeInstance('10001', dispose, [], quiesce);
        const internals = manager as unknown as {
            instances: Map<string, OneBotInstance>;
            trackLifecycle(label: string, operation: Promise<unknown>): void;
        };
        internals.instances.set('10001', instance);
        internals.trackLifecycle('deferred startup', lifecycleGate);

        const disposing = manager.dispose();
        expect(quiesce).toHaveBeenCalledOnce();
        expect(dispose).not.toHaveBeenCalled();

        finishLifecycle();
        await disposing;
        expect(dispose).toHaveBeenCalledOnce();
    });

    it('retains a tracked rejection until final dispose reports it', async () => {
        const manager = new OneBotManager();
        (
            manager as unknown as {
                trackLifecycle(label: string, operation: Promise<unknown>): void;
            }
        ).trackLifecycle('probe shutdown', Promise.reject(new Error('release failed')));

        await expect(manager.dispose()).rejects.toThrow(/failed to dispose OneBot manager cleanly/);
    });

    it('keeps a failed retire visible and blocks a conflicting same-UIN generation', async () => {
        const manager = new OneBotManager();
        const degraded: AdapterStatus = {
            name: 'old-http',
            kind: 'httpServer',
            status: 'degraded',
            detail: 'release failed',
            lastError: 'release failed',
            lastErrorAt: Date.now(),
        };
        const old = fakeInstance(
            '10001',
            async () => {
                throw new Error('release failed');
            },
            [degraded],
        );
        (manager as unknown as { retiringInstances: Set<OneBotInstance> }).retiringInstances.add(
            old,
        );
        const bridge = {} as never;

        (
            manager as unknown as { onSessionStarted(uin: string, bridge: never): void }
        ).onSessionStarted('10001', bridge);
        await Promise.resolve();
        await Promise.resolve();
        await Promise.resolve();

        expect(manager.getInstance('10001')).toBeNull();
        expect(manager.getConnectionStatuses()).toEqual([
            {
                uin: '10001',
                nickname: 'retiring-10001',
                adapters: [degraded],
            },
        ]);
        expect(
            (manager as unknown as { pendingStarts: Map<string, unknown> }).pendingStarts.has(
                '10001',
            ),
        ).toBe(false);
    });

    it('starts the replacement account when release never finishes', async () => {
        const originalCwd = process.cwd();
        const savedDeadline = process.env.SNOWLUMA_SESSION_RELEASE_DEADLINE_MS;
        delete process.env.SNOWLUMA_SESSION_RELEASE_DEADLINE_MS;
        const root = mkdtempSync(path.join(tmpdir(), 'snowluma-manager-release-'));
        process.chdir(root);
        const forceRelease = vi.fn();
        const old = {
            ...fakeInstance('10001', () => new Promise(() => undefined)),
            forceRelease,
        } as unknown as OneBotInstance;
        const replacement = {
            ...fakeInstance('10001', async () => undefined),
            waitUntilNetworkReady: vi.fn(async () => ({ applied: true, statuses: [], errors: [] })),
            startLoginHistorySync: vi.fn(),
        } as unknown as OneBotInstance;
        let created = false;
        const manager = new OneBotManager({
            sessionReleaseDeadlineMs: 30,
            createDatabaseMigrationTask: () => ({
                beginMigration: vi.fn(),
                cancel: vi.fn(),
                start: (next) => {
                    next.onReady();
                },
            }),
            createInstance: () => {
                created = true;
                return replacement;
            },
        });
        const internals = manager as unknown as {
            retiringInstances: Set<OneBotInstance>;
            onSessionStarted(uin: string, bridge: never): void;
            pendingStarts: Map<string, unknown>;
        };

        try {
            internals.retiringInstances.add(old);
            internals.onSessionStarted('10001', fakeBridge() as never);
            await vi.waitFor(() => {
                expect(created).toBe(true);
            });
            expect(forceRelease).toHaveBeenCalledOnce();
            expect(manager.getInstance('10001')).toBe(replacement);
            expect(internals.pendingStarts.has('10001')).toBe(false);
            expect(internals.retiringInstances.has(old)).toBe(false);
        } finally {
            if (savedDeadline === undefined) {
                delete process.env.SNOWLUMA_SESSION_RELEASE_DEADLINE_MS;
            } else {
                process.env.SNOWLUMA_SESSION_RELEASE_DEADLINE_MS = savedDeadline;
            }

            process.chdir(originalCwd);
            rmSync(root, { recursive: true, force: true });
        }
    });

    it('uses SNOWLUMA_SESSION_RELEASE_DEADLINE_MS instead of a longer configured deadline', async () => {
        const originalCwd = process.cwd();
        const savedDeadline = process.env.SNOWLUMA_SESSION_RELEASE_DEADLINE_MS;
        process.env.SNOWLUMA_SESSION_RELEASE_DEADLINE_MS = '40';
        const root = mkdtempSync(path.join(tmpdir(), 'snowluma-manager-release-env-'));
        process.chdir(root);
        const forceRelease = vi.fn();
        const old = {
            ...fakeInstance('10001', () => new Promise(() => undefined)),
            forceRelease,
        } as unknown as OneBotInstance;
        let created = false;
        const replacement = {
            ...fakeInstance('10001', async () => undefined),
            waitUntilNetworkReady: vi.fn(async () => ({ applied: true, statuses: [], errors: [] })),
            startLoginHistorySync: vi.fn(),
        } as unknown as OneBotInstance;
        const manager = new OneBotManager({
            sessionReleaseDeadlineMs: 60_000,
            createDatabaseMigrationTask: () => ({
                beginMigration: vi.fn(),
                cancel: vi.fn(),
                start: (next) => {
                    next.onReady();
                },
            }),
            createInstance: () => {
                created = true;
                return replacement;
            },
        });
        const internals = manager as unknown as {
            retiringInstances: Set<OneBotInstance>;
            onSessionStarted(uin: string, bridge: never): void;
        };

        try {
            internals.retiringInstances.add(old);
            internals.onSessionStarted('10001', fakeBridge() as never);
            await vi.waitFor(() => {
                expect(created).toBe(true);
            });
            expect(forceRelease).toHaveBeenCalledOnce();
        } finally {
            if (savedDeadline === undefined) {
                delete process.env.SNOWLUMA_SESSION_RELEASE_DEADLINE_MS;
            } else {
                process.env.SNOWLUMA_SESSION_RELEASE_DEADLINE_MS = savedDeadline;
            }

            process.chdir(originalCwd);
            rmSync(root, { recursive: true, force: true });
        }
    });

    it('allows a later same-UIN start observation to retry a failed handoff', async () => {
        const manager = new OneBotManager();
        let attempts = 0;
        let finishRetry!: () => void;
        const retryGate = new Promise<void>((resolve) => {
            finishRetry = resolve;
        });
        const old = fakeInstance('10001', async () => {
            attempts += 1;

            if (attempts === 1) {
                throw new Error('first release failed');
            }

            await retryGate;
            return { closed: true, errors: [] };
        });
        const internals = manager as unknown as {
            retiringInstances: Set<OneBotInstance>;
            onSessionStarted(uin: string, bridge: never): void;
            onSessionClosed(uin: string): void;
            pendingStarts: Map<string, unknown>;
        };
        internals.retiringInstances.add(old);
        internals.onSessionStarted('10001', {} as never);
        await Promise.resolve();
        await Promise.resolve();
        await Promise.resolve();
        expect(internals.pendingStarts.has('10001')).toBe(false);

        internals.onSessionStarted('10001', {} as never);
        expect(internals.pendingStarts.has('10001')).toBe(true);
        // The replacement session disappears while the retry is pending; cancel
        // creation so the test never needs a concrete Bridge.
        internals.onSessionClosed('10001');
        finishRetry();
        await Promise.resolve();
        await Promise.resolve();
        expect(attempts).toBe(2);
        expect(manager.getInstance('10001')).toBeNull();
        await expect(manager.dispose()).resolves.toBeUndefined();
    });

    it('binds a multi-generation handoff failure only to the generation that failed', async () => {
        const manager = new OneBotManager();
        const a = fakeInstance('10001', async () => ({ closed: true, errors: [] }));
        let bAttempts = 0;
        const b = fakeInstance('10001', async () => {
            bAttempts += 1;

            if (bAttempts === 1) {
                throw new Error('B release failed');
            }

            return { closed: true, errors: [] };
        });
        const internals = manager as unknown as {
            retiringInstances: Set<OneBotInstance>;
            onSessionStarted(uin: string, bridge: never): void;
        };
        internals.retiringInstances.add(a);
        internals.retiringInstances.add(b);
        internals.onSessionStarted('10001', {} as never);
        await Promise.resolve();
        await Promise.resolve();
        await Promise.resolve();
        await Promise.resolve();

        expect(internals.retiringInstances.has(a)).toBe(false);
        expect(internals.retiringInstances.has(b)).toBe(true);
        await expect(manager.dispose()).resolves.toBeUndefined();
        expect(bAttempts).toBe(2);
    });

    it('does not let a successful same-UIN generation clear another generation failure', async () => {
        const manager = new OneBotManager();
        const a = fakeInstance('10001', async () => {
            throw new Error('A still owns port');
        });
        const b = fakeInstance('10001', async () => undefined);
        const internals = manager as unknown as {
            retiringInstances: Set<OneBotInstance>;
            trackLifecycle(
                label: string,
                operation: Promise<unknown>,
                instances?: OneBotInstance[],
            ): void;
        };
        internals.retiringInstances.add(a);
        internals.retiringInstances.add(b);
        internals.trackLifecycle(
            'network shutdown UIN=10001',
            Promise.reject(new Error('A previous failure')),
            [a],
        );

        await expect(manager.dispose()).rejects.toThrow(/failed to dispose OneBot manager cleanly/);
    });

    it('ignores session-closed after dispose so process-exit closed does not retire again', async () => {
        const manager = new OneBotManager();
        const dispose = vi.fn(async () => ({ closed: true, errors: [] }));
        const instance = fakeInstance('10001', dispose);
        const internals = manager as unknown as {
            instances: Map<string, OneBotInstance>;
            retiringInstances: Set<OneBotInstance>;
            onSessionClosed(uin: string): void;
        };
        internals.instances.set('10001', instance);

        await manager.dispose();
        expect(dispose).toHaveBeenCalledOnce();

        const lateDispose = vi.fn(async () => ({ closed: true, errors: [] }));
        const late = fakeInstance('10001', lateDispose);
        internals.instances.set('10001', late);
        internals.onSessionClosed('10001');

        expect(lateDispose).not.toHaveBeenCalled();
        expect(internals.retiringInstances.has(late)).toBe(false);
        expect(manager.getInstance('10001')).toBe(late);
    });
});