import { describe, expect, it } from 'bun:test';

import { parseOpenAPI, traverse } from '@gitbook/openapi-parser';
import serverPrecedenceSpec from './fixtures/spec-server-precedence.json';
import { resolveOpenAPIOperation } from './resolveOpenAPIOperation';

async function loadFixture(spec: object) {
    const { filesystem } = await parseOpenAPI({
        value: JSON.stringify(spec),
        rootURL: 'memory://spec.json',
    });
    return filesystem;
}

async function fetchFilesystem(url: string) {
    const response = await fetch(url);
    const text = await response.text();
    const { filesystem } = await parseOpenAPI({ value: text, rootURL: url });
    const transformedFs = await traverse(filesystem, async (node) => {
        if ('description' in node && typeof node.description === 'string' && node.description) {
            node['x-gitbook-description-html'] = node.description;
        }
        return node;
    });
    return transformedFs;
}

describe('#resolveOpenAPIOperation', () => {
    it('should resolve refs', async () => {
        const filesystem = await fetchFilesystem(
            'https://petstore3.swagger.io/api/v3/openapi.json'
        );
        const resolved = await resolveOpenAPIOperation(filesystem, { method: 'put', path: '/pet' });

        expect(resolved).toMatchObject({
            servers: [
                {
                    url: '/api/v3',
                },
            ],
            operation: {
                tags: ['pet'],
                summary: 'Update an existing pet.',
                description: 'Update an existing pet by Id.',
                requestBody: {
                    content: {
                        'application/json': {
                            schema: {
                                type: 'object',
                                required: ['name', 'photoUrls'],
                            },
                        },
                    },
                },
            },
        });
    });

    it('should support yaml', async () => {
        const filesystem = await fetchFilesystem(
            'https://petstore3.swagger.io/api/v3/openapi.yaml'
        );
        const resolved = await resolveOpenAPIOperation(filesystem, { method: 'put', path: '/pet' });

        expect(resolved).toMatchObject({
            servers: [
                {
                    url: '/api/v3',
                },
            ],
            operation: {
                tags: ['pet'],
                summary: 'Update an existing pet.',
                description: 'Update an existing pet by Id.',
                requestBody: {
                    content: {
                        'application/json': {
                            schema: {
                                type: 'object',
                                required: ['name', 'photoUrls'],
                            },
                        },
                    },
                },
            },
        });
    });

    it('should resolve circular refs', async () => {
        const filesystem = await fetchFilesystem('https://api.gitbook.com/openapi.json');
        const resolved = await resolveOpenAPIOperation(filesystem, {
            method: 'get',
            path: '/spaces/{spaceId}/content/page/{pageId}',
        });

        expect(resolved).toMatchObject({
            servers: [
                {
                    url: '{host}/v1',
                },
            ],
            operation: {
                operationId: 'getPageById',
            },
        });
    });

    it('should resolve to null if the method is not supported', async () => {
        const filesystem = await fetchFilesystem(
            'https://petstore3.swagger.io/api/v3/openapi.json'
        );
        const resolved = await resolveOpenAPIOperation(filesystem, {
            method: 'dontexist',
            path: '/pet',
        });

        expect(resolved).toBe(null);
    });

    it('should parse Swagger 2.0', async () => {
        const filesystem = await fetchFilesystem('https://petstore.swagger.io/v2/swagger.json');
        const resolved = await resolveOpenAPIOperation(filesystem, {
            method: 'put',
            path: '/pet',
        });

        expect(resolved).toMatchObject({
            servers: [
                {
                    url: 'https://petstore.swagger.io/v2',
                },
                {
                    url: 'http://petstore.swagger.io/v2',
                },
            ],
            operation: {
                tags: ['pet'],
                summary: 'Update an existing pet',
                description: '',
                requestBody: {
                    content: {
                        'application/json': {
                            schema: {
                                type: 'object',
                                required: ['name', 'photoUrls'],
                            },
                        },
                    },
                },
            },
        });
    });

    it('should resolve a ref with whitespace', async () => {
        const filesystem = await fetchFilesystem(
            ' https://petstore3.swagger.io/api/v3/openapi.json'
        );
        const resolved = await resolveOpenAPIOperation(filesystem, {
            method: 'put',
            path: '/pet',
        });

        expect(resolved).toMatchObject({
            servers: [
                {
                    url: '/api/v3',
                },
            ],
            operation: {
                tags: ['pet'],
                summary: 'Update an existing pet.',
                description: 'Update an existing pet by Id.',
                requestBody: {
                    content: {
                        'application/json': {
                            schema: {
                                type: 'object',
                                required: ['name', 'photoUrls'],
                            },
                        },
                    },
                },
            },
        });
    });

    describe('x-enable-proxy', () => {
        it('should extract x-enable-proxy when set to true', async () => {
            const filesystem = await loadFixture({
                openapi: '3.1.0',
                info: { title: 'Test', version: '1.0' },
                'x-enable-proxy': true,
                paths: {
                    '/test': {
                        get: { responses: { '200': { description: 'OK' } } },
                    },
                },
            });
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/test',
            });

            expect(resolved?.['x-enable-proxy']).toBe(true);
        });

        it('should extract x-enable-proxy when set to false', async () => {
            const filesystem = await loadFixture({
                openapi: '3.1.0',
                info: { title: 'Test', version: '1.0' },
                'x-enable-proxy': false,
                paths: {
                    '/test': {
                        get: { responses: { '200': { description: 'OK' } } },
                    },
                },
            });
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/test',
            });

            expect(resolved?.['x-enable-proxy']).toBe(false);
        });

        it('should return undefined when x-enable-proxy is not set', async () => {
            const filesystem = await loadFixture({
                openapi: '3.1.0',
                info: { title: 'Test', version: '1.0' },
                paths: {
                    '/test': {
                        get: { responses: { '200': { description: 'OK' } } },
                    },
                },
            });
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/test',
            });

            expect(resolved?.['x-enable-proxy']).toBeUndefined();
        });

        it('should ignore x-enable-proxy when not a boolean', async () => {
            const filesystem = await loadFixture({
                openapi: '3.1.0',
                info: { title: 'Test', version: '1.0' },
                'x-enable-proxy': 'yes',
                paths: {
                    '/test': {
                        get: { responses: { '200': { description: 'OK' } } },
                    },
                },
            });
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/test',
            });

            expect(resolved?.['x-enable-proxy']).toBeUndefined();
        });

        it('should be available at the operation level', async () => {
            const filesystem = await loadFixture({
                openapi: '3.1.0',
                info: { title: 'Test', version: '1.0' },
                paths: {
                    '/test': {
                        get: {
                            'x-enable-proxy': true,
                            responses: { '200': { description: 'OK' } },
                        },
                    },
                },
            });
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/test',
            });

            expect(resolved?.operation['x-enable-proxy']).toBe(true);
        });

        it('should allow operation-level to override spec-level', async () => {
            const filesystem = await loadFixture({
                openapi: '3.1.0',
                info: { title: 'Test', version: '1.0' },
                'x-enable-proxy': true,
                paths: {
                    '/test': {
                        get: {
                            'x-enable-proxy': false,
                            responses: { '200': { description: 'OK' } },
                        },
                    },
                },
            });
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/test',
            });

            expect(resolved?.['x-enable-proxy']).toBe(true);
            expect(resolved?.operation['x-enable-proxy']).toBe(false);
        });

        it('should allow operation-level true to override spec-level false', async () => {
            const filesystem = await loadFixture({
                openapi: '3.1.0',
                info: { title: 'Test', version: '1.0' },
                'x-enable-proxy': false,
                paths: {
                    '/test': {
                        get: {
                            'x-enable-proxy': true,
                            responses: { '200': { description: 'OK' } },
                        },
                    },
                },
            });
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/test',
            });

            expect(resolved?.['x-enable-proxy']).toBe(false);
            expect(resolved?.operation['x-enable-proxy']).toBe(true);
        });
    });

    describe('server precedence', () => {
        it('should use root-level servers when no path or operation servers are defined', async () => {
            const filesystem = await loadFixture(serverPrecedenceSpec);
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/root-only',
            });

            expect(resolved?.servers).toEqual([{ url: 'https://root.example.com' }]);
        });

        it('should use path-level servers over root-level servers', async () => {
            const filesystem = await loadFixture(serverPrecedenceSpec);
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/path-override',
            });

            expect(resolved?.servers).toEqual([{ url: 'https://path.example.com' }]);
        });

        it('should use operation-level servers over path and root-level servers', async () => {
            const filesystem = await loadFixture(serverPrecedenceSpec);
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/operation-override',
            });

            expect(resolved?.servers).toEqual([{ url: 'https://operation.example.com' }]);
        });

        it('should use operation-level servers over root-level when no path servers exist', async () => {
            const filesystem = await loadFixture(serverPrecedenceSpec);
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/operation-skip-path',
            });

            expect(resolved?.servers).toEqual([{ url: 'https://operation.example.com' }]);
        });

        it('should fallback to root-level servers for endpoints without overrides', async () => {
            const filesystem = await loadFixture(serverPrecedenceSpec);
            const resolved = await resolveOpenAPIOperation(filesystem, {
                method: 'get',
                path: '/no-servers',
            });

            expect(resolved?.servers).toEqual([{ url: 'https://root.example.com' }]);
        });
    });
});