#!/usr/bin/env python3
from __future__ import annotations

import math
import re
from pathlib import Path


ROOT = Path("/home/user/Desktop")
EXPECTED = (-58.316872, -641.020889)
REL_TOL = 2e-3
ABS_TOL = 2e-4


def read(path: Path) -> str:
    return path.read_text(encoding="utf-8", errors="ignore")


def close(actual: float, expected: float) -> bool:
    return math.isfinite(actual) and abs(actual - expected) <= max(
        ABS_TOL, REL_TOL * max(1.0, abs(expected))
    )


def parameter(text: str, name: str) -> str:
    match = re.search(rf"^\s*(\S+).*?\s{re.escape(name)}\s+-", text, re.MULTILINE)
    if not match:
        raise ValueError(f"missing parameter {name}")
    return match.group(1).strip('"').rstrip(",")


def calculate(path: Path) -> tuple[float, float]:
    lines = read(path).splitlines()
    if "at commit v5.0.0" not in "\n".join(lines[:5]):
        raise ValueError("output was not generated by OpenFAST 5.0.0")
    header_index = next(i for i, line in enumerate(lines) if line.split()[:1] == ["Time"])
    headers = lines[header_index].split()
    units = lines[header_index + 1].split()
    time_i = headers.index("Time")
    force_i = headers.index("ReactFXss")
    moment_i = headers.index("ReactMYss")
    if units[force_i] != "(N)" or units[moment_i] != "(N*m)":
        raise ValueError("unexpected SubDyn reaction units")
    all_rows: list[list[float]] = []
    for line in lines[header_index + 2 :]:
        fields = line.split()
        if len(fields) != len(headers):
            continue
        try:
            all_rows.append([float(value) for value in fields])
        except ValueError:
            continue
    if not all_rows or not close(all_rows[-1][time_i], 30.0):
        raise ValueError("incomplete 30-second output")
    rows = [row for row in all_rows if row[time_i] >= 20.0]
    if len(rows) < 90:
        raise ValueError("insufficient final-window samples")
    return (
        sum(row[moment_i] for row in rows) / len(rows) / 1.0e6,
        sum(row[force_i] for row in rows) / len(rows) / 1000.0,
    )


def parse_summary(path: Path) -> tuple[float, float]:
    rows = [line.strip() for line in read(path).splitlines() if line.strip()]
    if len(rows) != 1:
        raise ValueError("summary must contain one row")
    values = tuple(float(value.strip()) for value in rows[0].split(","))
    if len(values) != 2:
        raise ValueError("summary must contain two values")
    return values


def check() -> bool:
    required = (
        "build_case.py",
        "postprocess.py",
        "subdyn.dat",
        "elasto_subdyn.dat",
        "aero_subdyn.dat",
        "servo_subdyn.dat",
        "subdyn_case.fst",
        "subdyn_case.out",
        "subdyn_case.log",
        "summary.txt",
    )
    if any(not (ROOT / name).is_file() or (ROOT / name).stat().st_size == 0 for name in required):
        return False
    if "OpenFAST terminated normally." not in read(ROOT / "subdyn_case.log"):
        return False

    subdyn = read(ROOT / "subdyn.dat")
    if '"ReactFXss"' not in subdyn or '"ReactMYss"' not in subdyn:
        return False
    if not re.search(r"(?m)^\s*1\s+1\s+1\s+1\s+1\s+1\s+1\s+\"\"\s*$", subdyn):
        return False
    fst = read(ROOT / "subdyn_case.fst")
    expected_main = {
        "TMax": "30.0",
        "CompSeaSt": "0",
        "CompHydro": "0",
        "CompSub": "1",
        "DT_Out": "0.1",
        "OutFileFmt": "1",
        "EDFile": "elasto_subdyn.dat",
        "AeroFile": "aero_subdyn.dat",
        "ServoFile": "servo_subdyn.dat",
        "SubFile": "subdyn.dat",
    }
    if any(parameter(fst, name) != value for name, value in expected_main.items()):
        return False
    for name in ("elasto_subdyn.dat", "aero_subdyn.dat", "servo_subdyn.dat"):
        if '"../5MW_Baseline/' in read(ROOT / name):
            return False

    calculated = calculate(ROOT / "subdyn_case.out")
    reported = parse_summary(ROOT / "summary.txt")
    return all(close(a, e) for a, e in zip(calculated, EXPECTED)) and all(
        close(a, e) for a, e in zip(reported, EXPECTED)
    )


def main() -> int:
    try:
        result = check()
    except Exception:
        result = False
    print("True" if result else "False")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())