// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright (C) 2025 - 2026, Patrick Schurig / ETM PowerSync

#include "etmvariableloadadapter.h"
#include "plugininfo.h"

#include <QDateTime>
#include <algorithm>
#include <integrations/thingmanager.h>
#include <integrations/thing.h>
#include <types/action.h>
#include <types/param.h>
#include <integrations/thingactioninfo.h>

EtmVariableLoadAdapter::EtmVariableLoadAdapter(ThingManager *thingManager,
                                               const QString &id,
                                               const QString &label,
                                               const QList<int> &powerLevels,
                                               int maxPowerW,
                                               int priority,
                                               const LoadNeeds &needs,
                                               QObject *parent)
    : QObject(parent)
    , m_thingManager(thingManager)
    , m_id(id)
    , m_label(label)
    , m_powerLevels(powerLevels)
    , m_maxPowerW(maxPowerW)
    , m_priority(priority)
    , m_needs(needs)
{
    // Re-tri par sécurité : l'UI émet trié, l'energymanager re-trie (contrat §6 cas limites).
    std::sort(m_powerLevels.begin(), m_powerLevels.end());
    // Contrat §2 : les paliers incluent 0. En *fixed* (liste non vide), 0 doit être présent.
    Q_ASSERT(m_powerLevels.isEmpty() || m_powerLevels.first() == 0);
}

LoadDescriptor EtmVariableLoadAdapter::descriptor() const
{
    LoadDescriptor d;
    d.id       = m_id;
    d.label    = m_label;
    d.adapter  = QStringLiteral("etmvariableload");
    d.priority = m_priority;

    d.declared.powerLevels = m_powerLevels;
    d.declared.maxPowerW   = m_maxPowerW;
    d.needs                = m_needs;

    d.supportedKinds = { LoadAction::Setpoint };
    return d;
}

LoadTelemetry EtmVariableLoadAdapter::telemetry() const
{
    LoadTelemetry t;
    Thing *thing  = m_thingManager->findConfiguredThing(ThingId(m_id));
    t.available    = (thing != nullptr) && !m_faulted;
    t.currentPowerW = readCurrentPowerW();   // juge runtime (contrat §4)
    // ECS-414 — INDÉTERMINATION : écriture en vol, on annonce la plus HAUTE des deux
    // consignes possibles si le thing ne mesure pas. Jamais moins que ce qui peut couler.
    if (m_pending > 0 && t.currentPowerW <= 0)
        t.currentPowerW = qMax(m_setpointPrev, m_setpointTarget);
    t.lastActionAt = m_lastActionAt;
    return t;
}

LoadContext EtmVariableLoadAdapter::toLoadContext(const QDateTime &now) const
{
    Q_UNUSED(now)   // aucune fenêtre de verrou côté moteur : l'anti-rebond vit dans le thing.

    LoadContext ctx;
    ctx.id       = m_id;
    ctx.adapter  = QStringLiteral("etmvariableload");
    ctx.label    = m_label;
    ctx.priority = m_priority;
    ctx.declared = descriptor().declared;

    ctx.telemetry.currentPowerW = telemetry().currentPowerW;
    ctx.telemetry.available     = telemetry().available;
    if (m_faulted) {
        // Charge FIGÉE : plancher == plafond == puissance crue engagée.
        ctx.telemetry.lockMinPowerW = ctx.telemetry.currentPowerW;
        ctx.telemetry.lockMaxPowerW = ctx.telemetry.currentPowerW;
    }
    return ctx;
}

LoadAction EtmVariableLoadAdapter::applyAction(const LoadAction &action, const QDateTime &now)
{
    if (action.kind != LoadAction::Setpoint)
        return action;

    if (action.reason.isEmpty()) {
        qCWarning(dcNymeaEnergy()) << "[EtmVariableLoadAdapter]" << m_label
                                   << "— LoadAction sans reason rejetée.";
        return action;
    }

    // ECS-414 — en défaut, plus aucune consigne écrite, y compris forcée.
    if (m_faulted) {
        LoadAction refused = action;
        refused.powerW = refused.estimatedPowerW = m_currentSetpointW;
        return refused;
    }

    // Second filet (invariant ILoadAdapter) : borner la consigne au plafond physique.
    // L'arrondi au powerLevels (mode *fixed*) est fait par le scheduler (contrat §4, T3).
    const double setpointW = qBound(0.0, action.powerW, static_cast<double>(m_maxPowerW));

    qCInfo(dcNymeaEnergy()) << "[EtmVariableLoadAdapter]" << m_label
                            << "→ setpoint" << qRound(setpointW) << "W"
                            << (action.force ? "(force)" : "")
                            << "|" << action.reason;

    m_setpointPrev   = m_currentSetpointW;
    m_setpointTarget = setpointW;
    m_writeFailed    = false;
    writeSetpoint(setpointW);

    m_currentSetpointW = setpointW;
    m_lastActionAt     = now;

    LoadAction applied = action;
    applied.powerW          = setpointW;
    applied.estimatedPowerW = setpointW;
    return applied;
}

void EtmVariableLoadAdapter::applySafeState(const QDateTime &now)
{
    LoadAction sur;
    sur.loadId = m_id;
    sur.kind   = LoadAction::Setpoint;
    sur.powerW = 0;
    sur.force  = true;
    sur.reason = QStringLiteral("Charge désactivée — mise en état sûr (0 W) avant retrait (ECS-413)");
    applyAction(sur, now);
}

// ---- privé ---------------------------------------------------------------

double EtmVariableLoadAdapter::readCurrentPowerW() const
{
    Thing *thing = m_thingManager->findConfiguredThing(ThingId(m_id));
    if (!thing)
        return 0.0;
    if (thing->thingClass().stateTypes().findByName("currentPowerW").id().isNull())
        return 0.0;
    return thing->stateValue("currentPowerW").toDouble();
}

void EtmVariableLoadAdapter::writeSetpoint(double powerW)
{
    Thing *thing = m_thingManager ? m_thingManager->findConfiguredThing(ThingId(m_id)) : nullptr;
    if (!thing) {
        qCWarning(dcNymeaEnergy()) << "[EtmVariableLoadAdapter]" << m_label
                                   << "— thing non trouvé:" << m_id;
        m_writeFailed = true;
        settleTransition();
        return;
    }

    StateType setpointStateType = thing->thingClass().stateTypes().findByName("powerSetpoint");
    if (setpointStateType.id().isNull()) {
        thing->setStateValue("powerSetpoint", powerW);  // repli mock : synchrone
        return;
    }

    Action setpointAction(setpointStateType.id(), thing->id(), Action::TriggeredByRule);
    setpointAction.setParams(ParamList() << Param(setpointStateType.id(), powerW));
    ThingActionInfo *info = m_thingManager->executeAction(setpointAction);
    if (!info) {
        m_writeFailed = true;
        settleTransition();
        return;
    }
    // ECS-414 — même modèle qu'ECS-410 : aucune attente, verdict par signal, `this` en contexte.
    ++m_pending;
    connect(info, &ThingActionInfo::finished, this, [this, info]() {
        if (info->status() != Thing::ThingErrorNoError) {
            m_writeFailed = true;
            qCWarning(dcNymeaEnergy()) << "[EtmVariableLoadAdapter]" << m_label
                                       << "— écriture consigne en échec, status" << info->status();
        }
        if (--m_pending == 0)
            settleTransition();
    });
}

void EtmVariableLoadAdapter::settleTransition()
{
    if (!m_writeFailed) {
        m_setpointPrev = m_setpointTarget = m_currentSetpointW;
        return;
    }
    m_writeFailed = false;

    switch (m_phase) {
    case PhaseNominale:
        qCWarning(dcNymeaEnergy()) << "[EtmVariableLoadAdapter]" << m_label
                                   << "— échec d'écriture : retour à" << m_setpointPrev << "W.";
        m_phase = PhaseRepli;
        m_currentSetpointW = m_setpointPrev;
        writeSetpoint(m_setpointPrev);
        break;
    case PhaseRepli:
        qCWarning(dcNymeaEnergy()) << "[EtmVariableLoadAdapter]" << m_label
                                   << "— retour arrière en échec : consigne 0 W.";
        m_phase = PhasePlancher;
        m_currentSetpointW = 0;
        m_setpointTarget   = 0;
        writeSetpoint(0);
        break;
    case PhasePlancher:
    case PhaseDefaut:
        qCCritical(dcNymeaEnergy()) << "[EtmVariableLoadAdapter]" << m_label
                                    << "— consigne 0 W en échec : charge EN DÉFAUT, plus aucune"
                                    << "commande. Levée par NymeaEnergy.ClearLoadFault.";
        m_phase   = PhaseDefaut;
        m_faulted = true;
        break;
    }
}

void EtmVariableLoadAdapter::clearFault()
{
    if (!m_faulted)
        return;
    qCInfo(dcNymeaEnergy()) << "[EtmVariableLoadAdapter]" << m_label
                            << "— défaut levé par l'opérateur (ClearLoadFault).";
    m_faulted = false;
    m_phase   = PhaseNominale;
    m_writeFailed = false;
    m_currentSetpointW = readCurrentPowerW();   // relu, pas supposé
    m_setpointPrev = m_setpointTarget = m_currentSetpointW;
}