"""Tests for Chronicle event emission."""

import json
from io import StringIO
from unittest.mock import patch

from substrate_sdk.chronicle import LAYER_APPLICATION, ShardEmitter, emit_event
from substrate_sdk.context import ShardContext


class TestEmitEvent:

    def test_writes_to_stdout(self, capsys):
        emit_event("TEST_EVENT", 3, {"key": "val"})
        out = capsys.readouterr().out.strip()
        data = json.loads(out)
        assert data["substrate_event"] is True

    def test_kind_in_output(self, capsys):
        emit_event("APP_SHARD_STARTED", 3, {})
        data = json.loads(capsys.readouterr().out.strip())
        assert data["kind"] == "APP_SHARD_STARTED"

    def test_layer_in_output(self, capsys):
        emit_event("X", 2, {})
        data = json.loads(capsys.readouterr().out.strip())
        assert data["layer"] == 2

    def test_non_fatal_on_error(self):
        with patch("builtins.print", side_effect=Exception("boom")):
            result = emit_event("TEST", 3, {})
        assert result is False


class TestShardEmitter:

    def test_carries_context(self, capsys):
        ctx = ShardContext(shard_name="test", shard_id="abc-123", accord_hash="xyz-456")
        emitter = ShardEmitter(ctx)
        emitter.emit("TEST", 3, {})
        data = json.loads(capsys.readouterr().out.strip())
        assert data["accord_hash"] == "xyz-456"
        assert data["shard_id"] == "abc-123"

    def test_request_helper(self, capsys):
        ctx = ShardContext(shard_name="test", shard_id="s1")
        emitter = ShardEmitter(ctx)
        emitter.request("GET", "/api/", 200, 42.0)
        data = json.loads(capsys.readouterr().out.strip())
        assert data["kind"] == "APP_DJANGO_REQUEST"
        assert data["payload"]["method"] == "GET"
        assert data["payload"]["status"] == 200