import { describe, expect, it } from 'vitest';
import { RestorePreflightError } from '../src/webui/backup';
import { describeRestoreFailure } from '../src/webui/server';
import { RestoreTransactionError } from '../src/webui/restore';

function failure(
    phase: RestoreTransactionError['phase'],
    options: Partial<{
        cause: unknown;
        rollbackSucceeded: boolean;
        snapshotDir: string;
        committed: boolean;
        failedFiles: string[];
    }> = {},
): RestoreTransactionError {
    return new RestoreTransactionError({
        phase,
        transactionId: `tx-${phase}`,
        message: `restore ${phase} failed`,
        cause: options.cause ?? new Error(`${phase} root cause`),
        rollbackSucceeded: options.rollbackSucceeded,
        snapshotDir: options.snapshotDir,
        committed: options.committed,
        failedFiles: options.failedFiles,
    });
}

describe('describeRestoreFailure', () => {
    it('returns a client error with the semantic preflight detail', () => {
        const error = failure('preflight', {
            cause: new RestorePreflightError('runtime.json', '$.webuiPort must be 1-65535'),
            failedFiles: ['runtime.json'],
        });

        expect(describeRestoreFailure(error)).toEqual({
            status: 400,
            body: {
                success: false,
                message: '备份校验失败：runtime.json: $.webuiPort must be 1-65535',
                transactionId: 'tx-preflight',
                phase: 'preflight',
                committed: false,
                failedFiles: ['runtime.json'],
            },
        });
    });

    it('says the live config was rolled back after a commit failure', () => {
        const error = failure('commit', {
            rollbackSucceeded: true,
            failedFiles: ['notifications.json'],
        });

        expect(describeRestoreFailure(error)).toEqual({
            status: 500,
            body: {
                success: false,
                message: '恢复失败，当前配置已自动回滚。事务 ID：tx-commit。请检查服务器日志。',
                transactionId: 'tx-commit',
                phase: 'commit',
                committed: false,
                rollbackSucceeded: true,
                failedFiles: ['notifications.json'],
            },
        });
    });

    it('keeps recovery coordinates visible when rollback is incomplete', () => {
        const error = failure('rollback', {
            rollbackSucceeded: false,
            committed: true,
            snapshotDir: '/srv/snowluma/config/.restore-transaction-tx-rollback',
            failedFiles: ['runtime.json'],
        });

        const response = describeRestoreFailure(error);
        expect(response.status).toBe(500);
        expect(response.body).toEqual(
            expect.objectContaining({
                success: false,
                transactionId: 'tx-rollback',
                phase: 'rollback',
                committed: true,
                rollbackSucceeded: false,
                snapshotDir: '/srv/snowluma/config/.restore-transaction-tx-rollback',
                failedFiles: ['runtime.json'],
            }),
        );
        expect(response.body.message).toContain('自动回滚不完整');
        expect(response.body.message).toContain('请勿重启或继续修改配置');
        expect(response.body.message).toContain(
            '/srv/snowluma/config/.restore-transaction-tx-rollback',
        );
    });

    it('distinguishes a committed restore from a failed restore when only cleanup fails', () => {
        const error = failure('cleanup', {
            committed: true,
            snapshotDir: '/srv/snowluma/config/.restore-transaction-tx-cleanup',
        });

        const response = describeRestoreFailure(error);
        expect(response.status).toBe(500);
        expect(response.body).toEqual(
            expect.objectContaining({
                success: false,
                transactionId: 'tx-cleanup',
                phase: 'cleanup',
                committed: true,
                snapshotDir: '/srv/snowluma/config/.restore-transaction-tx-cleanup',
            }),
        );
        expect(response.body.message).toContain('配置已恢复');
        expect(response.body.message).toContain('重启后配置仍会生效');
        expect(response.body.message).toContain(
            '/srv/snowluma/config/.restore-transaction-tx-cleanup',
        );
    });

    it('surfaces retained transaction files when pre-commit cleanup fails', () => {
        const error = failure('cleanup', {
            snapshotDir: '/srv/snowluma/config/.restore-transaction-tx-cleanup',
            failedFiles: ['notifications.json'],
        });

        const response = describeRestoreFailure(error);
        expect(response.body.message).toContain('当前配置未改动');
        expect(response.body.message).toContain('临时事务目录清理失败');
        expect(response.body.message).toContain(
            '/srv/snowluma/config/.restore-transaction-tx-cleanup',
        );
    });

    it('surfaces retained transaction files after rollback cleanup fails', () => {
        const error = failure('cleanup', {
            rollbackSucceeded: true,
            snapshotDir: '/srv/snowluma/config/.restore-transaction-tx-cleanup',
            failedFiles: ['notifications.json'],
        });

        const response = describeRestoreFailure(error);
        expect(response.body.message).toContain('当前配置已自动回滚');
        expect(response.body.message).toContain('临时事务目录清理失败');
        expect(response.body.message).toContain(
            '/srv/snowluma/config/.restore-transaction-tx-cleanup',
        );
    });
});