import hashlib
import json
import re
import subprocess
from pathlib import Path

ROOT = Path("/app/vendor/project")
EXPECTED = json.loads(Path("/tests/fixtures/expected.json").read_text())

def source(path):
    return re.sub(r"\s+", " ", (ROOT / path).read_text())

def test_gate_artifact_schema_and_status():
    artifact = Path("/app/output.json")
    assert artifact.is_file()
    data = json.loads(artifact.read_text())
    assert data["output_schema_version"] == EXPECTED["output_schema_version"]
    assert data["status"] == "PASS"
    assert set(data["source_checks"]) == set(EXPECTED["required_checks"])
    assert all(data["source_checks"].values())

def test_core_trace_digest_independent_recompute():
    data = json.loads(Path("/app/output.json").read_text())
    trace = data["trace"]
    assert hashlib.sha256(json.dumps(trace, sort_keys=True).encode()).hexdigest() == EXPECTED["trace_digest"]
    assert [item["cycle"] for item in trace] == [0, 1, 2, 3, 4]

def test_core_redirect_drops_abandoned_instruction():
    data = json.loads(Path("/app/output.json").read_text())
    redirect = next(item for item in data["trace"] if item["redirect"])
    assert redirect["state"] == "CmIdle"
    assert redirect["retire"] == "none"
    assert data["retired_after_redirect"] == EXPECTED["retired_after_redirect"]

def test_core_source_contract_is_wired():
    decoder = source("rtl/ibex_compressed_decoder.sv")
    if_stage = source("rtl/ibex_if_stage.sv")
    assert "input logic flush_expanded_i" in decoder
    assert ".flush_expanded_i(flush_expanded)" in if_stage
    assert "assign flush_expanded = pc_set_i && (pc_mux_i == PC_EXC)" in if_stage

def test_edge_normal_zcmp_path_remains_present():
    decoder = (ROOT / "rtl/ibex_compressed_decoder.sv").read_text()
    assert "cm_state_d = CmPushStoreReg" in decoder
    assert "cm_state_d = CmPopLoadReg" in decoder
    assert "parameter ibex_pkg::rv32zc_e RV32ZC" in decoder

def test_edge_real_workspace_and_regression_entrypoint():
    assert (ROOT / "rtl/ibex_core.f").is_file()
    assert (ROOT / "examples/simple_system/rtl/ibex_simple_system.sv").is_file()
    completed = subprocess.run(["python3", str(ROOT / "rtl_regression.py"), "--output", "/tmp/recomputed.json"], check=False)
    assert completed.returncode == 0
    assert json.loads(Path("/tmp/recomputed.json").read_text())["trace_digest"] == EXPECTED["trace_digest"]