class DiagnosisEngine:
    def __init__(self):
        self.signals = {}

    def add(self, key, value):
        self.signals[key] = value

    def evaluate(self):
        results = []

        lms = self.signals.get("lms")
        ha_logs_client_error = self.signals.get("ha_logs_client_connector_error")
        ha_container = self.signals.get("ha_container")
        ha_dependency_failure = (
            lms == "000"
            and ha_logs_client_error
            and ha_container == "running"
        )

        # LMS
        if lms == "000" and not ha_dependency_failure:
            results.append("[info] LMS is not reachable")
        elif lms == "200":
            results.append("[info] LMS: OK")

        # Dependency failures
        if ha_dependency_failure:
            results.append("[warning] HA dependency failure: LMS unreachable")

        # HA local
        ha_local = self.signals.get("ha_local")
        if ha_local == "000":
            options = [
                {
                    "label": "Restart HA",
                    "command": "restart_ha",
                    "confidence": 0.85,
                },
                {
                    "label": "Check network",
                    "command": "check_network",
                    "confidence": 0.6,
                }
            ]
            ignore_option = {
                "label": "Ignore",
                "command": "ignore",
                "is_ignore": True,
            }
            results.append("[error] HA is not working locally")
            results.append(
                {
                    "type": "proposal",
                    "message": "Home Assistant is not working",
                    "confidence": 0.85,
                    "options": sorted(
                        options,
                        key=lambda option: option["confidence"],
                        reverse=True,
                    ) + [ignore_option],
                }
            )
        elif ha_local == "200":
            results.append("[info] HA local: OK")

        # HA proxy
        ha_proxy = self.signals.get("ha_proxy")
        if ha_proxy == "dns_error":
            results.append("[error] HA proxy: DNS failure")
            results.append("[error] external access issue: DNS or routing failure")
        elif ha_proxy == "000":
            results.append("[error] HA proxy: not reachable")
        elif ha_proxy == "200":
            results.append("[info] HA proxy: OK")

        diagnosis_count = sum(1 for result in results if isinstance(result, str))
        if diagnosis_count > 1:
            results.append("[info] multiple issues detected")

        return results