import { describe, it, expect } from 'vitest';
import { computeTools, callTool, parseMode } from '../src/tools';
import type {
    ActionClient,
    OneBotEnvelope,
    StreamCallOptions,
    StreamCallResult,
} from '../src/client';

type Res = Awaited<ReturnType<typeof callTool>>;

function text(res: Res): string {
    const block = res.content?.[0];
    return block && block.type === 'text' ? block.text : '';
}

function parsed(res: Res): any {
    return JSON.parse(text(res));
}

/** A fake ActionClient — no transport. Records the last call and returns a
 *  canned envelope (overridable per test). */
function fakeClient(
    impl?: (action: string, params: Record<string, unknown>) => OneBotEnvelope,
    streamImpl?: (
        action: string,
        params: Record<string, unknown>,
        options?: StreamCallOptions,
    ) => StreamCallResult,
): ActionClient {
    return {
        call: async (action, params) =>
            impl?.(action, params) ?? { status: 'ok', retcode: 0, data: { action, params } },
        callStream: async (action, params, options) =>
            streamImpl?.(action, params, options) ?? {
                frame_count: 1,
                frames: [],
                terminal: { status: 'ok', retcode: 0, data: { type: 'response', action, params } },
            },
    };
}

describe('computeTools — mode gating', () => {
    it('fails fast on an invalid SNOWLUMA_MCP_MODE', () => {
        expect(parseMode(undefined)).toBeUndefined();
        expect(parseMode('WRITE')).toBe('write');

        for (const invalid of ['', 'unsafe', 'reader']) {
            expect(() => parseMode(invalid), invalid).toThrow(/SNOWLUMA_MCP_MODE/);
        }
    });
    it('docs mode exposes catalog tools and local runtime information', () => {
        expect(computeTools('docs').map((t) => t.name)).toEqual([
            'list_actions',
            'get_action',
            'search_actions',
            'list_categories',
            'get_runtime_info',
        ]);
    });
    it('read mode adds query_action only (no invoke_action)', () => {
        const names = computeTools('read').map((t) => t.name);
        expect(names).toContain('query_action');
        expect(names).not.toContain('invoke_action');
    });
    it('write mode adds both query_action and invoke_action', () => {
        const names = computeTools('write').map((t) => t.name);
        expect(names).toContain('query_action');
        expect(names).toContain('invoke_action');
    });
    it('annotations are honest: query=readOnly, invoke=destructive', () => {
        const q = computeTools('write').find((t) => t.name === 'query_action');
        const inv = computeTools('write').find((t) => t.name === 'invoke_action');
        expect(q?.annotations?.readOnlyHint).toBe(true);
        expect(inv?.annotations?.readOnlyHint).toBe(false);
        expect(inv?.annotations?.destructiveHint).toBe(true);
    });
});

describe('callTool — docs tools (no client needed)', () => {
    it('list_actions returns entries that carry readOnly', async () => {
        const data = parsed(await callTool('list_actions', {}, { mode: 'docs' }));
        expect(data.count).toBeGreaterThan(100);
        expect(typeof data.actions[0].readOnly).toBe('boolean');
    });
    it('get_action resolves a known read-only action', async () => {
        const a = parsed(await callTool('get_action', { name: 'get_status' }, { mode: 'docs' }));
        expect(a.name).toBe('get_status');
        expect(a.readOnly).toBe(true);
    });
    it('get_action on a write action reports readOnly=false', async () => {
        expect(
            parsed(await callTool('get_action', { name: 'send_group_msg' }, { mode: 'docs' }))
                .readOnly,
        ).toBe(false);
    });
    it('get_action accepts an alias', async () => {
        // nc_get_rkey is an alias of get_rkey (read-only).
        const a = parsed(await callTool('get_action', { name: 'nc_get_rkey' }, { mode: 'docs' }));
        expect(a.name).toBe('get_rkey');
    });
});

describe('callTool — query_action (read)', () => {
    it.each([null, [], 'invalid', 42, false].map((params) => ({ params })))(
        'rejects invalid params without invoking the client ($params)',
        async ({ params }) => {
            let called = false;
            const client = fakeClient(() => {
                called = true;
                return { status: 'ok', retcode: 0, data: null };
            });
            const res = await callTool(
                'query_action',
                { action: 'get_status', params },
                { mode: 'read', client },
            );
            expect(res.isError).toBe(true);
            expect(text(res)).toContain('params');
            expect(called).toBe(false);
        },
    );

    it('executes a read-only action and passes the envelope through', async () => {
        const res = await callTool(
            'query_action',
            { action: 'get_status', params: {} },
            { mode: 'read', client: fakeClient() },
        );
        expect(res.isError).toBeFalsy();
        expect(parsed(res).retcode).toBe(0);
    });
    it('refuses a write action and points to invoke_action', async () => {
        const res = await callTool(
            'query_action',
            { action: 'send_group_msg', params: {} },
            { mode: 'read', client: fakeClient() },
        );
        expect(res.isError).toBe(true);
        expect(text(res)).toContain('invoke_action');
    });
    it('refuses an unknown action', async () => {
        const res = await callTool(
            'query_action',
            { action: 'no_such_action' },
            { mode: 'read', client: fakeClient() },
        );
        expect(res.isError).toBe(true);
        expect(text(res)).toContain('未知 action');
    });
    it('is blocked in docs mode even when called directly (defense in depth)', async () => {
        const res = await callTool('query_action', { action: 'get_status' }, { mode: 'docs' });
        expect(res.isError).toBe(true);
    });
    it('errors clearly when no client is wired', async () => {
        const res = await callTool('query_action', { action: 'get_status' }, { mode: 'read' });
        expect(res.isError).toBe(true);
        expect(text(res)).toContain('未配置');
    });
});

describe('callTool — invoke_action (write)', () => {
    it('executes a write action in write mode and forwards action+params', async () => {
        let seen: { action: string; params: Record<string, unknown> } | null = null;
        const client: ActionClient = {
            call: async (action, params) => {
                seen = { action, params };
                return { status: 'ok', retcode: 0, data: { message_id: 42 } };
            },
            callStream: async () => {
                throw new Error('unexpected stream call');
            },
        };
        const res = await callTool(
            'invoke_action',
            { action: 'send_group_msg', params: { group_id: 1, message: 'hi' } },
            { mode: 'write', client },
        );
        expect(res.isError).toBeFalsy();
        expect(seen!.action).toBe('send_group_msg');
        expect(seen!.params).toEqual({ group_id: 1, message: 'hi' });
        expect(parsed(res).data.message_id).toBe(42);
    });
    it('is blocked in read mode (write gate cannot be bypassed)', async () => {
        const res = await callTool(
            'invoke_action',
            { action: 'send_group_msg', params: {} },
            { mode: 'read', client: fakeClient() },
        );
        expect(res.isError).toBe(true);
        expect(text(res)).toContain('写操作未启用');
    });
    it('passes a retcode≠0 envelope through as data, NOT isError', async () => {
        const client = fakeClient(() => ({
            status: 'failed',
            retcode: 1404,
            message: 'not found',
            wording: '未找到',
        }));
        const res = await callTool(
            'invoke_action',
            { action: 'send_group_msg', params: {} },
            { mode: 'write', client },
        );
        expect(res.isError).toBeFalsy();
        expect(parsed(res).retcode).toBe(1404);
        expect(parsed(res).wording).toBe('未找到');
    });
    it('maps a transport-level throw to isError', async () => {
        const client: ActionClient = {
            call: async () => {
                throw new Error('connection refused');
            },
            callStream: async () => {
                throw new Error('unexpected stream call');
            },
        };
        const res = await callTool(
            'invoke_action',
            { action: 'send_group_msg', params: {} },
            { mode: 'write', client },
        );
        expect(res.isError).toBe(true);
        expect(text(res)).toContain('调用失败');
        expect(text(res)).toContain('connection refused');
    });
    it('accepts a read-only action too (invoke is a superset)', async () => {
        const res = await callTool(
            'invoke_action',
            { action: 'get_status', params: {} },
            { mode: 'write', client: fakeClient() },
        );
        expect(res.isError).toBeFalsy();
    });
    it('refuses an unknown action (typo safety)', async () => {
        const res = await callTool(
            'invoke_action',
            { action: 'frobnicate' },
            { mode: 'write', client: fakeClient() },
        );
        expect(res.isError).toBe(true);
        expect(text(res)).toContain('未知 action');
    });

    it('routes catalog Stream Actions through callStream and returns the bounded summary', async () => {
        let ordinaryCalls = 0;
        let streamCalls = 0;
        const terminal = {
            status: 'ok',
            retcode: 0,
            data: { type: 'response', data_type: 'data_complete' },
        };
        const client: ActionClient = {
            call: async () => {
                ordinaryCalls++;
                return { status: 'ok', retcode: 0 };
            },
            callStream: async (action, params) => {
                streamCalls++;
                expect(action).toBe('test_download_stream');
                expect(params).toEqual({ error: false });
                return { frame_count: 1, frames: [], terminal };
            },
        };

        const res = await callTool(
            'invoke_action',
            { action: 'test_download_stream', params: { error: false } },
            { mode: 'write', client },
        );

        expect(res.isError).toBeFalsy();
        expect(parsed(res)).toEqual({ frame_count: 1, frames: [], terminal });
        expect(streamCalls).toBe(1);
        expect(ordinaryCalls).toBe(0);
    });

    it('passes execution.input_file only as an MCP upload option, never as OneBot params', async () => {
        let seen: { params: Record<string, unknown>; inputFile?: string } | undefined;
        const client = fakeClient(undefined, (_action, params, options) => {
            seen = { params, inputFile: options?.inputFile };
            return {
                file_path: '/remote/local.txt',
                file_size: 5,
                sha256: 'abc',
                chunk_count: 1,
                stream_id: 'id',
                terminal: {
                    status: 'ok',
                    retcode: 0,
                    data: { type: 'response', status: 'file_complete' },
                },
            };
        });

        const res = await callTool(
            'invoke_action',
            {
                action: 'upload_file_stream',
                params: { file_retention: 0 },
                execution: { input_file: '/allowed/local.txt' },
            },
            { mode: 'write', client },
        );

        expect(res.isError).toBeFalsy();
        expect(seen).toEqual({ params: { file_retention: 0 }, inputFile: '/allowed/local.txt' });
    });

    it('forwards MCP request cancellation to Stream Action execution', async () => {
        const controller = new AbortController();
        let seenSignal: AbortSignal | undefined;
        const client = fakeClient(undefined, (_action, _params, options) => {
            seenSignal = options?.signal;
            return {
                frame_count: 1,
                frames: [],
                terminal: {
                    status: 'ok',
                    retcode: 0,
                    data: { type: 'response', data_type: 'data_complete' },
                },
            };
        });

        const res = await callTool(
            'invoke_action',
            { action: 'test_download_stream', params: {} },
            {
                mode: 'write',
                client,
                signal: controller.signal,
            },
        );

        expect(res.isError).toBeFalsy();
        expect(seenSignal).toBe(controller.signal);
    });
});