#pragma once
// What the FX chains SHOULD be, derived from view state: an ordered per-track
// work list plus its resolution against a live chain. Derived, never persisted
// and never in an undo record — the park record's captured FX half is the only
// persisted half. Pure: FX identities are opaque strings the shell reads from
// REAPER (TrackFX_GetFXGUID) and hands in.

#include <set>
#include <string>
#include <vector>

#include "core/view/fx_offline.h"
#include "core/view/view_mode_model.h"

namespace reasampler::view {

enum class FxWorkKind {
    Online,   // back to the park record's captured per-FX state, verbatim
    Offline,  // reclaim: every live FX offline
};

// One track's whole FX move, and the ATOMIC unit of work: a drain may stop
// between items, never inside one, so an item is either untouched or complete
// and no partial state survives a tick boundary. Do not reintroduce a
// within-track resume cursor — carrying one across ticks meant reconciling it
// against a chain the user may have edited in between, and the case an FX with
// no reported identity forced (a cursor that reads as "nothing done yet" and
// re-walks the item forever) was a live non-termination hazard.
struct FxTrackWork {
    std::string trackGuid;
    FxWorkKind  kind = FxWorkKind::Offline;

    // Online: the captured targets, verbatim — never a blanket "online", which is
    // exactly what would lose the plugins the USER had offline before the park.
    // Offline: empty. The live chain is the target set, and only the shell can
    // read it, so resolveFxWork synthesises the targets from what it is handed.
    std::vector<FxOfflineOp> targets;

    bool operator==(const FxTrackWork& o) const {
        return trackGuid == o.trackGuid && kind == o.kind && targets == o.targets;
    }
};

// The whole project's FX work, from view state alone — no folder tree, because a
// park record is only ever written for a track the planner already decided to
// park (parents and show-both leaves never get one).
//
// ONLINE WORK SORTS FIRST: onlining restores state the user owns, offlining is
// opportunistic reclaim that may be deferred indefinitely without losing
// anything. Within a kind, GUID order — deterministic, so a drain's position in
// the list survives a re-derivation.
//
// `targetMode` is explicit, mirroring planToggle, rather than read from
// `model.activeModeId()`: applyMode sets the active mode LAST, after its park
// and restore loops, so a caller reading it from inside or before that block
// would classify every track against the OUTGOING mode instead.
std::vector<FxTrackWork> desiredFxState(const ViewModeModel& model,
                                        const std::string& targetMode,
                                        const std::set<std::string>& liveTrackGuids);

// One track's Online targets from its park record's FX half; empty when the
// record holds none. Each target carries the record's keying, so a snapshot
// lifted from a pre-identity project still restores by slot.
std::vector<FxOfflineOp> fxRestoreTargets(const ViewModeModel& model,
                                          const std::string& trackGuid);

// Resolves one work item against the chain as it stands, where `liveFxGuids[i]`
// is the identity of the FX at slot `i` right now (empty when REAPER reported
// none) — the item's WHOLE move, matched by identity: an identity that is not
// live is DROPPED, never re-pointed at a slot.
FxRestoreResolution resolveFxWork(const FxTrackWork& work,
                                  const std::vector<std::string>& liveFxGuids);

}  // namespace reasampler::view