import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { defineStreamAction } from '../src/action-kit';
import {
    currentRequestId,
    getLogLevel,
    nextRequestId,
    runWithRequestId,
    setLogLevel,
    subscribeLogs,
    type LogEntry,
} from '@snowluma/common/logger';
import { StreamTransportClosedError, StreamStatus } from '../src/streaming';
import type { JsonObject } from '../src/types';
import { createCompiledTestHandler, testAction } from './helpers/compiled-action-handler';

function emptyContext(): any {
    return {};
}

function actionEntries(entries: LogEntry[], action: string): LogEntry[] {
    return entries.filter(
        (entry) =>
            entry.scope === 'Bridge.Action' &&
            entry.level === 'trace' &&
            entry.message.includes(`action=${action}`),
    );
}

describe('ApiHandler TRACE lifecycle', () => {
    let previousLevel: string;
    let entries: LogEntry[];
    let unsubscribe: () => void;

    beforeEach(() => {
        previousLevel = getLogLevel();
        setLogLevel('trace');
        entries = [];
        unsubscribe = subscribeLogs((entry) => entries.push(entry));
    });

    afterEach(() => {
        unsubscribe();
        setLogLevel(previousLevel);
    });

    it('records complete input and returned response with one terminal', async () => {
        const secret = 'trace-secret-' + 'x'.repeat(200);
        const handler = createCompiledTestHandler(emptyContext(), [
            testAction('trace_ok', async () => ({
                status: 'ok',
                retcode: 0,
                data: { nested: { secret, values: [1, 2, 3] } },
            })),
        ]);

        await handler.handle('trace_ok', { nested: { access_token: secret } });

        const lifecycle = actionEntries(entries, 'trace_ok');
        expect(lifecycle.filter((entry) => entry.message.startsWith('action_input'))).toHaveLength(
            1,
        );
        expect(
            lifecycle.filter((entry) => entry.message.startsWith('action_terminal')),
        ).toHaveLength(1);
        expect(lifecycle[0]?.message).toContain(secret);
        expect(lifecycle.at(-1)?.message).toContain(secret);
        expect(lifecycle.at(-1)?.message).toContain('outcome=ok');
        expect(lifecycle.at(-1)?.message).toContain('reason=response_returned');
        expect(new Set(lifecycle.map((entry) => entry.req)).size).toBe(1);
        expect(lifecycle[0]?.req).toBeTypeOf('number');
    });

    it('distinguishes returned failure, handler throw, unknown action, and quiesce', async () => {
        const handler = createCompiledTestHandler(emptyContext(), [
            testAction('returned_failure', async () => ({
                status: 'failed',
                retcode: 1400,
                data: null,
                wording: 'invalid input',
            })),
            testAction('thrown_failure', async () => {
                throw new Error('exploded');
            }),
        ]);

        await handler.handle('returned_failure', {});
        await handler.handle('thrown_failure', {});
        await handler.handle('unknown_trace_action', {});
        handler.quiesce();
        await handler.handle('returned_failure', {});

        const returned = actionEntries(entries, 'returned_failure').filter((entry) =>
            entry.message.startsWith('action_terminal'),
        );
        expect(returned[0]?.message).toContain('outcome=failed reason=response_returned');
        expect(returned[0]?.message).toContain('wording:"invalid input"');
        expect(returned[1]?.message).toContain('outcome=failed reason=quiesced');

        const thrown = actionEntries(entries, 'thrown_failure').filter((entry) =>
            entry.message.startsWith('action_terminal'),
        );
        expect(thrown).toHaveLength(1);
        expect(thrown[0]?.message).toContain('outcome=failed reason=handler_threw');
        expect(thrown[0]?.message).toContain('wording:"exploded"');

        const unknown = actionEntries(entries, 'unknown_trace_action').filter((entry) =>
            entry.message.startsWith('action_terminal'),
        );
        expect(unknown).toHaveLength(1);
        expect(unknown[0]?.message).toContain('outcome=failed reason=unknown_action');
    });

    it('records parsed transport rejections without executing actions or observers', () => {
        const run = vi.fn(async () => ({ status: 'ok' as const, retcode: 0, data: null }));
        const observer = vi.fn();
        const handler = createCompiledTestHandler(emptyContext(), [
            testAction('transport_quiesced', run),
        ]);
        handler.setObserver(observer);
        handler.quiesce();

        handler.traceQuiescedStreamRequest(
            JSON.stringify({
                action: 'transport_quiesced',
                params: { access_token: 'complete-secret' },
                echo: 'not-part-of-params',
            }),
        );
        handler.traceQuiescedStreamRequest('not json');
        handler.traceQuiescedStreamRequest(JSON.stringify({ params: {} }));

        const lifecycle = actionEntries(entries, 'transport_quiesced');
        expect(lifecycle).toHaveLength(2);
        expect(lifecycle[0]?.message).toContain('action_input');
        expect(lifecycle[0]?.message).toContain('complete-secret');
        expect(lifecycle[0]?.message).not.toContain('not-part-of-params');
        expect(lifecycle[1]?.message).toContain('outcome=failed reason=quiesced');
        expect(new Set(lifecycle.map((entry) => entry.req)).size).toBe(1);
        expect(run).not.toHaveBeenCalled();
        expect(observer).not.toHaveBeenCalled();
    });

    it('ignores transport-rejection tracing while actions are still accepted', () => {
        const handler = createCompiledTestHandler(emptyContext(), [
            testAction('still_accepting', async () => ({ status: 'ok', retcode: 0, data: null })),
        ]);

        handler.traceQuiescedStreamRequest(
            JSON.stringify({
                action: 'still_accepting',
                params: {},
            }),
        );

        expect(actionEntries(entries, 'still_accepting')).toHaveLength(0);
    });

    it('records successful stream frames and classifies transport closure only', async () => {
        const stream = defineStreamAction({
            name: 'trace_stream',
            params: {},
            run: async (_params, _ctx, sink) => {
                await sink.send({ type: StreamStatus.Stream, chunk: 'complete-frame' });
                return {
                    status: 'ok',
                    retcode: 0,
                    data: { type: StreamStatus.Response },
                };
            },
        });
        const handler = createCompiledTestHandler(emptyContext(), [stream]);

        await handler.handle('trace_stream', {}, { send: async () => {} });
        const frames = actionEntries(entries, 'trace_stream').filter((entry) =>
            entry.message.startsWith('action_stream_frame'),
        );
        expect(frames).toHaveLength(1);
        expect(frames[0]?.message).toContain('complete-frame');

        entries = [];
        await handler.handle(
            'trace_stream',
            {},
            {
                send: async () => {
                    throw new StreamTransportClosedError();
                },
            },
        );
        const cancelled = actionEntries(entries, 'trace_stream').filter((entry) =>
            entry.message.startsWith('action_terminal'),
        );
        expect(cancelled).toHaveLength(1);
        expect(cancelled[0]?.message).toContain('outcome=cancelled reason=transport_closed');
        expect(
            actionEntries(entries, 'trace_stream').filter((entry) =>
                entry.message.startsWith('action_stream_frame'),
            ),
        ).toHaveLength(1);

        entries = [];
        await handler.handle(
            'trace_stream',
            {},
            {
                send: async () => {
                    throw new Error('arbitrary sink failure');
                },
            },
        );
        const failed = actionEntries(entries, 'trace_stream').filter((entry) =>
            entry.message.startsWith('action_terminal'),
        );
        expect(failed).toHaveLength(1);
        expect(failed[0]?.message).toContain('outcome=failed reason=handler_threw');
    });

    it('reuses an ambient request and gives separate top-level actions separate ids', async () => {
        let handler: ReturnType<typeof createCompiledTestHandler>;
        handler = createCompiledTestHandler(emptyContext(), [
            testAction('inner_trace', async () => ({ status: 'ok', retcode: 0, data: null })),
            testAction('outer_trace', async () => {
                await handler.handle('inner_trace', {});
                return { status: 'ok', retcode: 0, data: null };
            }),
        ]);

        await handler.handle('outer_trace', {});
        const nested = [
            ...actionEntries(entries, 'outer_trace'),
            ...actionEntries(entries, 'inner_trace'),
        ];
        expect(new Set(nested.map((entry) => entry.req)).size).toBe(1);

        entries = [];
        await handler.handle('inner_trace', {});
        await handler.handle('inner_trace', {});
        const topLevelInputs = actionEntries(entries, 'inner_trace').filter((entry) =>
            entry.message.startsWith('action_input'),
        );
        expect(topLevelInputs).toHaveLength(2);
        expect(topLevelInputs[0]?.req).not.toBe(topLevelInputs[1]?.req);

        entries = [];
        await runWithRequestId(424242, () => handler.handle('inner_trace', {}));
        expect(actionEntries(entries, 'inner_trace').every((entry) => entry.req === 424242)).toBe(
            true,
        );
    });

    it('does not allocate a request or render the complete object while TRACE is disabled', async () => {
        setLogLevel('info');
        const nested: JsonObject = {};
        Object.defineProperty(nested, 'danger', {
            enumerable: true,
            get: () => {
                throw new Error('verbose renderer ran');
            },
        });
        const handler = createCompiledTestHandler(emptyContext(), [
            testAction('trace_off', async () => ({ status: 'ok', retcode: 0, data: null })),
        ]);
        const before = nextRequestId();

        await expect(handler.handle('trace_off', { nested })).resolves.toMatchObject({
            status: 'ok',
        });

        const after = nextRequestId();
        expect(after).toBe(before + 1);
        expect(currentRequestId()).toBeUndefined();
        expect(actionEntries(entries, 'trace_off')).toHaveLength(0);
    });
});