// Standalone tests for the Design View park surface's pure decisions — no REAPER, no
// test framework.
//
// The properties under test: the four flags a park drives address exactly the four
// REAPER parameters the tool owns (never mute, never solo), and one mode apply leaves
// at most ONE undo point — none at all when a reapply found everything already where
// it wanted it.

#include "../src/shell/view/view_park.h"
#include "../src/shell/view/view.h"  // applyMintsUndoPoint — the apply's undo-point fold

#include "core/view/view_mode_model.h"  // makeParkPlan — the park flags' only producer

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

using namespace reasampler;

static int g_fail = 0;
#define CHECK(cond) do { if(!(cond)) { \
    std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)

// -- what a park is allowed to address ----------------------------------------
//
// trackFlagParm is the ONE mapping the park's pre-park read, the restore's write and
// the reconcile's repair all share; a mistyped parameter there is silent at compile
// time and drives the wrong track property forever.

static void testEachDrivenFlagAddressesItsOwnReaperParameter() {
    const std::set<std::string> parms{trackFlagParm(Flag::ShowInTcp),
                                      trackFlagParm(Flag::ShowInMixer),
                                      trackFlagParm(Flag::MainSend),
                                      trackFlagParm(Flag::FxEnable)};
    CHECK(parms.size() == 4);  // no two flags collapse onto one parameter
    CHECK(parms.count("B_SHOWINTCP") == 1);
    CHECK(parms.count("B_SHOWINMIXER") == 1);
    CHECK(parms.count("B_MAINSEND") == 1);
    CHECK(parms.count("I_FXEN") == 1);
}

static void testNoDrivenFlagCanEverAddressMuteOrSolo() {
    // The never-touch-mute invariant, held at the one place a Flag becomes a REAPER
    // parameter name.
    for (const Flag f : {Flag::ShowInTcp, Flag::ShowInMixer, Flag::MainSend, Flag::FxEnable}) {
        const std::string parm = trackFlagParm(f);
        CHECK(parm != "B_MUTE");
        CHECK(parm != "I_SOLO");
    }
}

static void testAParkPlanDrivesEveryDrivenFlagToZero() {
    // The four zeros are what a parked track's driven flags actually read; if
    // makeParkPlan ever writes something else, this is the test that says so.
    const TrackPlan park = makeParkPlan("{A}");

    CHECK(park.flags.size() == 4);
    std::set<std::string> parms;
    for (const TrackFlagOp& op : park.flags) {
        CHECK(op.guid == "{A}");
        CHECK(op.value == 0);
        parms.insert(trackFlagParm(op.flag));
    }
    CHECK(parms.size() == 4);
}

// -- the apply's one undo point ----------------------------------------------
//
// These pin applyMintsUndoPoint's fold only. The `wroteAnything` verdict it consumes
// — writeIfChanged / parkTrack / restoreTrack, all running against live REAPER calls
// — cannot be pinned here; docs/VERIFICATION.md §"Mode switching" is the sole cover
// for that plumbing being wired correctly.

static void testARealSwitchAlwaysLeavesAPointEvenWithNothingToWrite() {
    // An explicitly fired action stays undoable even when the plan found nothing to
    // write — the discard form is for reapplies only.
    CHECK(applyMintsUndoPoint(/*realSwitch=*/true, /*wroteAnything=*/false));
    CHECK(applyMintsUndoPoint(/*realSwitch=*/true, /*wroteAnything=*/true));
}

static void testAReapplyThatWroteSomethingLeavesAPoint() {
    // A tag/untag reapply that actually parked a track: real project state moved.
    CHECK(applyMintsUndoPoint(/*realSwitch=*/false, /*wroteAnything=*/true));
}

static void testAReapplyThatWroteNothingLeavesNoPointAtAll() {
    // The project-load reapply over a project saved fully parked: every flag already
    // sits where the plan wants it. Opening a project must not cost the user an undo
    // step.
    CHECK(!applyMintsUndoPoint(/*realSwitch=*/false, /*wroteAnything=*/false));
}

// -- the re-park union: a plugin added between a restore and the next park --------
//
// Sequence under test: park -> restore -> user adds plugin P -> re-park. Without the
// union, the record's prior verbatim-keep would drop P silently -- the reclaimer
// offlines it with everything else, and no snapshot ever names it to bring it back.

static void testAPluginAddedWhileRestoredJoinsTheUnionRatherThanBeingDropped() {
    const std::vector<FxOfflineState> prior{
        FxOfflineState{"{FX-A}", 1}, FxOfflineState{"{FX-B}", 0}};
    const std::vector<FxOfflineState> live{
        FxOfflineState{"{FX-A}", 0}, FxOfflineState{"{FX-B}", 0}, FxOfflineState{"{FX-P}", 0}};

    const std::vector<FxOfflineState> merged = unionFxOfflineOnRepark(prior, live);

    CHECK(merged.size() == 3);
    bool foundA = false, foundB = false, foundP = false;
    for (const FxOfflineState& fx : merged) {
        if (fx.fxGuid == "{FX-A}") { foundA = true; CHECK(fx.offline == 1); }  // record wins
        if (fx.fxGuid == "{FX-B}") { foundB = true; CHECK(fx.offline == 0); }  // record wins
        if (fx.fxGuid == "{FX-P}") { foundP = true; CHECK(fx.offline == 0); }  // added from live
    }
    CHECK(foundA && foundB && foundP);
}

static void testAPluginRemovedWhileRestoredStaysInTheUnionForResolveFxRestoreToDrop() {
    // The union is not where a removed plugin's entry disappears -- resolveFxRestore
    // owns that at restore time (missingIdentity, reported), so the merge must keep
    // naming it rather than quietly forgetting it here.
    const std::vector<FxOfflineState> prior{
        FxOfflineState{"{FX-A}", 1}, FxOfflineState{"{FX-REMOVED}", 1}};
    const std::vector<FxOfflineState> live{FxOfflineState{"{FX-A}", 0}};

    const std::vector<FxOfflineState> merged = unionFxOfflineOnRepark(prior, live);

    CHECK(merged.size() == 2);
    bool foundRemoved = false;
    for (const FxOfflineState& fx : merged)
        if (fx.fxGuid == "{FX-REMOVED}") foundRemoved = true;
    CHECK(foundRemoved);
}

int main() {
    testEachDrivenFlagAddressesItsOwnReaperParameter();
    testNoDrivenFlagCanEverAddressMuteOrSolo();
    testAParkPlanDrivesEveryDrivenFlagToZero();

    testARealSwitchAlwaysLeavesAPointEvenWithNothingToWrite();
    testAReapplyThatWroteSomethingLeavesAPoint();
    testAReapplyThatWroteNothingLeavesNoPointAtAll();

    testAPluginAddedWhileRestoredJoinsTheUnionRatherThanBeingDropped();
    testAPluginRemovedWhileRestoredStaysInTheUnionForResolveFxRestoreToDrop();

    if (g_fail == 0) std::printf("All tests passed.\n");
    return g_fail ? 1 : 0;
}