// Step 1929: CrossLanguageStepIntoHandler
//
//  t1: stepInto at non-boundary returns switched=false
//  t2: stepInto at boundary with different next language switches adapter
//  t3: stepInto returns correct targetFrameId
//  t4: stepInto at boundary where next frame is same language: no switch
//  t5: stepInto at last frame (no next): no switch

#include "CrossLanguageStepIntoHandler.h"
#include "PolyglotStackTraceDecoder.h"
#include "DebugAdapterRouter.h"
#include <iostream>

namespace ws = whetstone;
static int p=0,f=0;
#define T(n) { std::cout<<"  "<<#n<<"... "; }
#define P() { std::cout<<"PASS\n"; ++p; }
#define F(m) { std::cout<<"FAIL: "<<m<<"\n"; ++f; }
#define C(c,m) if(!(c)){F(m);return;}

static ws::DebugAdapterRouter makeRouter() {
    ws::DebugAdapterRouter r;
    r.registerAdapter("Python", {"stackTrace","stepIn"});
    r.registerAdapter("Rust",   {"stackTrace"});
    r.setActiveLanguage("Python");
    return r;
}

static std::vector<ws::StackFrame> makeStack() {
    ws::PolyglotStackTraceDecoder dec;
    return dec.decode({
        {1,"run",       "main.py", 10},
        {2,"generate",  "gen.py",  20},  // boundary
        {3,"sort_array","sort.rs",  5},  // boundary
        {4,"partition", "sort.rs", 15},
    });
}

void t1(){
    T(non_boundary_no_switch);
    ws::CrossLanguageStepIntoHandler h;
    auto router = makeRouter();
    auto frames = makeStack();
    auto r = h.stepInto(frames[0], router, frames, 0);
    C(!r.switched,                        "not switched");
    C(r.targetFrameId == -1,              "no target frame");
    C(router.getActiveLanguage() == "Python", "router unchanged");
    P();
}

void t2(){
    T(boundary_with_different_next_switches_adapter);
    ws::CrossLanguageStepIntoHandler h;
    auto router = makeRouter();
    auto frames = makeStack();
    // frames[1] is Python boundary, frames[2] is Rust
    auto r = h.stepInto(frames[1], router, frames, 1);
    C( r.switched,                        "switched");
    C( r.previousLanguage == "Python",    "previous Python");
    C( r.newLanguage == "Rust",           "new Rust");
    C( router.getActiveLanguage() == "Rust", "router now Rust");
    P();
}

void t3(){
    T(returns_correct_targetFrameId);
    ws::CrossLanguageStepIntoHandler h;
    auto router = makeRouter();
    auto frames = makeStack();
    auto r = h.stepInto(frames[1], router, frames, 1);
    C(r.targetFrameId == frames[2].id, "targetFrameId == frames[2].id");
    C(r.targetFrameId == 3,            "targetFrameId == 3");
    P();
}

void t4(){
    T(boundary_but_same_language_next_no_switch);
    ws::CrossLanguageStepIntoHandler h;
    // frames[2] is Rust boundary, frames[3] is also Rust → no switch
    auto router = makeRouter();
    auto frames = makeStack();
    auto r = h.stepInto(frames[2], router, frames, 2);
    C(!r.switched,          "not switched (same language)");
    C(r.targetFrameId == -1,"no target");
    P();
}

void t5(){
    T(last_frame_no_next_no_switch);
    ws::CrossLanguageStepIntoHandler h;
    auto router = makeRouter();
    auto frames = makeStack();
    int last = static_cast<int>(frames.size()) - 1;
    auto r = h.stepInto(frames[last], router, frames, last);
    C(!r.switched,          "no switch at last frame");
    C(r.targetFrameId == -1,"no target frame");
    P();
}

int main(){
    std::cout << "Step 1929: CrossLanguageStepIntoHandler\n";
    t1(); t2(); t3(); t4(); t5();
    std::cout << "\n" << p << "/" << (p+f) << " passed\n";
    return f > 0 ? 1 : 0;
}