#!/usr/bin/env python3
#
# cust_decay.py --- Radioactive Decay and Dose
#                   See HYSPLIT Tutorial Sec. 15.1
#
# Change history:
# 18 Apr 2026 (BB) - standard-aligned, cross-platform version
# 16 Jun 2026 (SZ) - create image files when DSP=NO
# 18 Jun 2026 (SZ) - standardize code for run_cmd(), convert_html_to_img(),
#                    etc. across Python scripts
#                  - ensure encoding is specified when opening files

import os
import sys
import platform
from pathlib import Path
import subprocess
import webbrowser

if sys.version_info < (3, 8):
    print("Please use Python 3.8 or higher.")
    sys.exit(1)

system = platform.system().lower()
if system == "windows":
    PGM = Path(sys.argv[1]) if len(sys.argv) > 1 else Path("C:\\hysplit")
    OUT = Path(sys.argv[2]) if len(sys.argv) > 2 else PGM / "working"
    DSP = sys.argv[3] if len(sys.argv) > 3 else "YES"
    TTR = Path(os.environ.get("TTR", "C:\\Tutorial"))
    exe_suffix = ".exe"
else:
    PGM = Path(sys.argv[1]) if len(sys.argv) > 1 else Path.home() / "hysplit"
    OUT = Path(sys.argv[2]) if len(sys.argv) > 2 else PGM / "working"
    DSP = sys.argv[3] if len(sys.argv) > 3 else "YES"
    TTR = Path(os.environ.get("TTR", Path.home() / "tutorial"))
    exe_suffix = ""

if not PGM.exists():
    script = Path(__file__).name if "__file__" in globals() else "cust_decay.py"
    print(f"ERROR: HYSPLIT not found at {PGM}")
    print(f"""
Please specify the path to your HYSPLIT installation using a command-line argument:

python {script} YOUR_HYSPLIT_DIRECTORY [OUT] [DSP (YES|NO)]

Example:
    python {script} C:\\hysplit C:\\hysplit\\working YES
""")
    sys.exit(1)

if not TTR.exists():
    print(f"ERROR: HYSPLIT tutorial not found at {TTR}")
    print("""
Please set the TTR environment variable to point to your HYSPLIT tutorial directory.

For Windows users (Command Prompt):
   SET TTR=YOUR_HYSPLIT_TUTORIAL_DIRECTORY

For Linux users (bash shell):
   export TTR='YOUR_HYSPLIT_TUTORIAL_DIRECTORY'

For Linux users (csh or tcsh shell):
   setenv TTR 'YOUR_HYSPLIT_TUTORIAL_DIRECTORY'""")
    sys.exit(1)

os.chdir(OUT)


# ------------------------------------------------------------------
# Helper functions
# ------------------------------------------------------------------

def run_cmd(cmd, desc="", allow_fail=False, stdout_file=None, append=False):
    if desc:
        print(f"{desc}...")

    exitcode = 0
    with subprocess.Popen(cmd,
                         stdout=subprocess.PIPE,
                         stderr=subprocess.STDOUT,
                         text=True) as p:
        if stdout_file:
            mode="a" if append else "w"
            with open(stdout_file, mode, encoding="utf-8") as f_out:
                for ln in p.stdout:
                    print(ln, end="")
                    f_out.write(ln)
        else:
            with p.stdout as f:
                for ln in iter(f.readline, b'\n'):
                    if len(ln) == 0:
                        break
                    print(ln.rstrip())

        done = False
        while not done:
            try:
                exitcode = p.wait(timeout=1)
                done = True
            except subprocess.TimeoutExpired:
                print("WARN: subprocess timed out.")

    if exitcode != 0:
        if allow_fail:
            print(f"WARN: command failed with exit code {exitcode} -> {' '.join(cmd)}")
        else:
            print(f"ERROR: command failed with exit code {exitcode} -> {' '.join(cmd)}")
            sys.exit(1)


def convert_html_to_img(html_file, img_name_frame_nums):
    # Split SVG into Linux-consistent naming: F00-sec71_001.svg, etc.
    temp_img_name = "temp"
    run_cmd([str(PGM / "exec" / f"splitsvg{exe_suffix}"),
             f"-i{html_file}", f"-o{temp_img_name}.svg"])

    # Locate ImageMagick for cross-platform conversion
    if system == "windows":
        convert_exe = None
        imgk_dir = next(
            (k for k in os.environ.get('PATH', '').split(os.pathsep)
             if "ImageMagick" in k),
            None
        )
        if imgk_dir:
            # Use magick.exe for ImageMagick 7.x and later. Use convert.exe for earlier versions.
            for cmd in ('magick', 'convert'):
                candidate = os.path.join(imgk_dir, f'{cmd}{exe_suffix}')
                if os.path.exists(candidate):
                    convert_exe = candidate
                    break
    else:
        convert_exe = "convert"

    if convert_exe:
        # Match Linux naming for DSP=NO mode exactly
        for img_name, frame_num in img_name_frame_nums:
            svg = Path(f"F{frame_num:02d}-{temp_img_name}.svg")
            run_cmd([convert_exe, str(svg), img_name])
            print(f"Converted {svg} -> {img_name}")
            svg.unlink()
    else:
        print("ImageMagick not found — skipping .svg conversion")


def find_met_dir(dat_name: str):
    env_override = os.environ.get("METDIR")
    candidates = []

    if env_override:
        candidates.append(Path(env_override))

    candidates += [
        wrk / "captex",
        TTR / "captex",
        TTR,
        PGM / "tutorial" / "captex",
        PGM / "tutorial",
        OUT / "captex",
        PGM / "met",
        PGM / "meteorology",
    ]

    for base in candidates:
        if base and (base / dat_name).exists():
            return base

    for root in [TTR, wrk, PGM]:
        try:
            for p in Path(root).rglob(dat_name):
                return p.parent
        except Exception:
            pass

    return None


# ---------- Mirror BAT variables ----------
wrk = OUT.parent

syr, smo, sda, shr = 83, 9, 25, 17
lat, lon, lvl = 39.90, -84.22, 10.0
run, top = 25, 10000.0
dat = "captex2_wrf27uw.bin"

met = find_met_dir(dat)
if met is None:
    print(f"ERROR: Meteorological file not found: {dat}")
    print("Set METDIR to the directory containing the file.")
    print("Example Windows: SET METDIR=C:\\Tutorial\\captex")
    sys.exit(1)

# Clean working directory
for fname in [
    "ASCDATA.CFG",
    "LABELS.CFG",
    "SETUP.CFG",
    "CONTROL",
    "c137.bin",
    "dosedaily.html",
    "doseyear.html",
]:
    p = OUT / fname
    if p.exists():
        p.unlink()

# ASCDATA.CFG
with open(OUT / "ASCDATA.CFG", "w", encoding="ascii") as f:
    f.write("-90.0   -180.0  lat/lon of lower left corner  \n")
    f.write("1.0     1.0     lat/lon spacing in degrees    \n")
    f.write("180     360     lat/lon number of data points \n")
    f.write("2               default land use category     \n")
    f.write("0.2             default roughness length (m)  \n")
    f.write(f"'{PGM / 'bdyfiles'}{os.sep}'  directory of files       \n")

# CONTROL
odir = f".{os.sep}"
with open(OUT / "CONTROL", "w", encoding="ascii") as f:
    f.write(f"{syr:02d} {smo:02d} {sda:02d} {shr:02d}\n")
    f.write("1\n")
    f.write(f"{lat:.2f} {lon:.2f} {lvl:.1f}\n")
    f.write(f"{run}\n")
    f.write("0\n")
    f.write(f"{top:.1f}\n")
    f.write("1\n")
    f.write(f"{met}{os.sep}\n")
    f.write(f"{dat}\n")
    f.write("1\n")
    f.write("C137\n")
    f.write("1.0E+16\n")
    f.write("1.0\n")
    f.write("00 00 00 00 00\n")
    f.write("1\n")
    f.write("42.0 -78.0\n")
    f.write("0.25 0.25\n")
    f.write("15.0 25.0\n")
    f.write(f"{odir}\n")
    f.write("c137.bin\n")
    f.write("2\n")
    f.write("0 100\n")
    f.write("83 09 25 18 00\n")
    f.write("83 09 28 15 00\n")
    f.write("00 03 00\n")
    f.write("1\n")
    f.write("1.0 1.0 1.0\n")
    f.write("0.001 0.0 0.0 0.0 0.0\n")
    f.write("0.0 8.0E-05 8.0E-05\n")
    f.write("10960.0\n")
    f.write("0.0\n")

# SETUP.CFG
with open(OUT / "SETUP.CFG", "w", encoding="ascii") as f:
    f.write("&SETUP\n")
    f.write("numpar = 50000,\n")
    f.write("maxpar = 100000,\n")
    f.write("/\n")

# Run model
run_cmd([str(PGM / "exec" / f"hycs_std{exe_suffix}")], "Running hycs_std")

def write_labels(mapid):
    with open(OUT / "LABELS.CFG", "w", encoding="ascii") as f:
        f.write(f"'TITLE&','### {Path(sys.argv[0]).name} ### &'\n")
        f.write("'UNITS&','REM&'\n")
        f.write("'VOLUM&','   &'\n")
        f.write(f"'MAPID&','{mapid}&'\n")

# Daily dose plot
write_labels("24-h Dose Equivalent")
run_cmd([
    str(PGM / "exec" / f"concplot{exe_suffix}"),
    "+g1",
    "-ic137.bin",
    "-z80",
    "-x1.0E-10",
    "-y2.6E-11",
    "-b0",
    "-t100",
    "-r3",
    f"-j{PGM / 'graphics' / 'arlmap'}",
    "-odosedaily",
], "Plotting daily dose")

html_file = OUT / "dosedaily.html"
if html_file.exists():
    if DSP == "YES":
        webbrowser.open(str(html_file.resolve()))
    else:
        convert_html_to_img(str(html_file), [("rad007.png",9)])

if DSP == "YES":
    input("Press Enter to continue...")


# Yearly dose plot
write_labels("1-yr Dose Equivalent")
run_cmd([
    str(PGM / "exec" / f"concplot{exe_suffix}"),
    "+g1",
    "-ic137.bin",
    "-z80",
    "-x1.0E-10",
    "-y9.6E-9",
    "-b0",
    "-t100",
    "-r3",
    f"-j{PGM / 'graphics' / 'arlmap'}",
    "-odoseyear",
], "Plotting yearly dose")

html_file = OUT / "doseyear.html"
if html_file.exists():
    if DSP == "YES":
        webbrowser.open(str(html_file.resolve()))
    else:
        convert_html_to_img(str(html_file), [("rad008.png",9)])

print("\nScript completed successfully!")