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

import math
import re
from pathlib import Path


ROOT = Path("/home/user/Desktop")
EXPECTED = (1749.944881, 362.987969)
REL_TOL = 2.0e-3
ABS_TOL = 2.0e-5


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


def close(
    actual: float,
    expected: float,
    rel_tol: float = REL_TOL,
    abs_tol: float = ABS_TOL,
) -> 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 output_metrics(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(
        index
        for index, 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")
    wind_i = headers.index("Wind1VelX")
    speed_i = headers.index("RotSpeed")
    power_i = headers.index("RtAeroPwr")
    thrust_i = headers.index("RtAeroFxh")
    if (
        units[time_i] != "(s)"
        or units[wind_i] != "(m/s)"
        or units[speed_i] != "(rpm)"
        or units[power_i] != "(W)"
        or units[thrust_i] != "(N)"
    ):
        raise ValueError("unexpected native OpenFAST units")

    rows: list[list[float]] = []
    for line in lines[header_index + 2 :]:
        fields = line.split()
        if len(fields) != len(headers):
            continue
        try:
            rows.append([float(value) for value in fields])
        except ValueError:
            continue
    if len(rows) != 301:
        raise ValueError("incorrect output sample count")
    for index, row in enumerate(rows):
        if not close(
            row[time_i],
            index / 10.0,
            rel_tol=0.0,
            abs_tol=2.0e-8,
        ):
            raise ValueError("output timestamps are not 0.1-second samples")
        if not close(row[wind_i], 8.0, rel_tol=0.0, abs_tol=2.0e-6):
            raise ValueError("output wind speed is not fixed at 8 m/s")
        if not close(row[speed_i], 9.0, rel_tol=0.0, abs_tol=2.0e-6):
            raise ValueError("rotor speed is not fixed at 9 rpm")

    final_rows = rows[200:]
    if len(final_rows) != 101:
        raise ValueError("incorrect final-window sample count")
    return (
        sum(row[power_i] for row in final_rows)
        / len(final_rows)
        / 1000.0,
        max(abs(row[thrust_i]) for row in final_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 exactly one row")
    values = tuple(float(field.strip()) for field in rows[0].split(","))
    if len(values) != 2 or not all(math.isfinite(value) for value in values):
        raise ValueError("summary must contain two finite values")
    return values


def check() -> bool:
    required = (
        "build_case.py",
        "postprocess.py",
        "minimal_elasto.dat",
        "minimal_aero.dat",
        "minimal.fst",
        "minimal.out",
        "minimal.log",
        "summary.txt",
        "5MW_Baseline/NRELOffshrBsline5MW_InflowWind_Steady8mps.dat",
    )
    if any(
        not (ROOT / name).is_file() or (ROOT / name).stat().st_size == 0
        for name in required
    ):
        return False

    inflow = read(
        ROOT
        / "5MW_Baseline/NRELOffshrBsline5MW_InflowWind_Steady8mps.dat"
    )
    if (
        parameter(inflow, "WindType") != "1"
        or parameter(inflow, "HWindSpeed") != "8"
    ):
        return False

    elasto = read(ROOT / "minimal_elasto.dat")
    expected_elasto = {
        "DrTrDOF": "False",
        "GenDOF": "False",
        "RotSpeed": "9.0",
    }
    if any(
        parameter(elasto, name) != value
        for name, value in expected_elasto.items()
    ):
        return False
    if '"../5MW_Baseline/' in elasto:
        return False

    aero = read(ROOT / "minimal_aero.dat")
    if parameter(aero, "Wake_Mod") != "1":
        return False
    if '"../5MW_Baseline/' in aero:
        return False
    if any(
        f'"{channel}"' not in aero
        for channel in ("RtAeroPwr", "RtAeroFxh")
    ):
        return False

    main = read(ROOT / "minimal.fst")
    expected_main = {
        "TMax": "30.0",
        "DT": "0.0125",
        "DT_Out": "0.1",
        "OutFileFmt": "1",
        "CompInflow": "1",
        "CompAero": "2",
        "CompServo": "0",
        "EDFile": "minimal_elasto.dat",
        "InflowFile": (
            "5MW_Baseline/"
            "NRELOffshrBsline5MW_InflowWind_Steady8mps.dat"
        ),
        "AeroFile": "minimal_aero.dat",
    }
    if any(
        parameter(main, name) != value
        for name, value in expected_main.items()
    ):
        return False

    log = read(ROOT / "minimal.log")
    if (
        "OpenFAST-v5.0.0" not in log
        or "OpenFAST terminated normally." not in log
        or "Simulated Time:        30 seconds" not in log
        or "FATAL ERROR" in log
    ):
        return False

    calculated = output_metrics(ROOT / "minimal.out")
    reported = parse_summary(ROOT / "summary.txt")
    return (
        all(
            close(actual, expected)
            for actual, expected in zip(calculated, EXPECTED)
        )
        and all(
            close(actual, expected)
            for actual, expected in zip(reported, EXPECTED)
        )
        and all(
            close(
                actual,
                calculated_value,
                rel_tol=0.0,
                abs_tol=2.0e-6,
            )
            for actual, calculated_value in zip(reported, calculated)
        )
    )


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


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