#!/usr/bin/env python3
#
# cust_smoke.py ---  Smoke Example with Emissions File
#                    See HYSPLIT Tutorial Sec. 14.1
#
# Change history:
# 24 Feb 2026 (BB) - standard-aligned, cross-platform version
# 15 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_smoke.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)

OUT.mkdir(parents=True, exist_ok=True)
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")


# constants
wrk = TTR
met_dir = wrk / "smoke"
emit_file = met_dir / "EMITIMES.txt"

# robust met file discovery
preferred_met = met_dir / "WRF200704.bin"
if preferred_met.exists():
    met_file = preferred_met.name
else:
    candidates = sorted(met_dir.glob("*.bin"))
    if not candidates:
        print(f"ERROR: No .bin meteorology files found in {met_dir}")
        print("Check your tutorial folder. Expected something like WRF200704.bin")
        sys.exit(1)
    met_file = candidates[0].name
    print(f"WARNING: WRF200704.bin not found. Using {met_file} instead.")

# input file checks
if not met_dir.exists():
    print(f"ERROR: Smoke tutorial directory not found: {met_dir}")
    sys.exit(1)

if not emit_file.exists():
    print(f"ERROR: EMITIMES file not found: {emit_file}")
    sys.exit(1)

if not (met_dir / "mayo_pm25.txt").exists():
    print(f"ERROR: Observation file not found: {met_dir / 'mayo_pm25.txt'}")
    sys.exit(1)

syr, smo, sda, shr = "07", "04", "16", "00"
lat, lon, lvl = 31.15, -82.40, 100.0
run_hours = 96
top = 10000.0

# ASCDATA.CFG
with open("ASCDATA.CFG", "w", encoding="ascii") as f:
    f.write(
        "-90.0   -180.0\n"
        "1.0     1.0\n"
        "180     360\n"
        "2\n"
        "0.2\n"
        f"'{PGM / 'bdyfiles'}{os.sep}'\n"
    )

# CONTROL
with open("CONTROL", "w", encoding="ascii") as f:
    f.write(f"{syr} {smo} {sda} {shr}\n")
    f.write("1\n")
    f.write(f"{lat} {lon} {lvl}\n")
    f.write(f"{run_hours}\n")
    f.write("0\n")
    f.write(f"{top}\n")
    f.write("1\n")
    f.write(f"{met_dir}{os.sep}\n")
    f.write(f"{met_file}\n")
    f.write("1\n")
    f.write("PM25\n")
    f.write("1.0\n")
    f.write("72.0\n")
    f.write("00 00 00 18 00\n")
    f.write("1\n")
    f.write("0.0 0.0\n")
    f.write("0.10 0.10\n")
    f.write("20.0 20.0\n")
    f.write(f".{os.sep}\n")
    f.write("smoke.bin\n")
    f.write("1\n")
    f.write("100\n")
    f.write("00 00 00 00 00\n")
    f.write("00 00 00 00 00\n")
    f.write("00 01 00\n")
    f.write("1\n")
    f.write("0.0 0.0 0.0\n")
    f.write("0.0 0.0 0.0 0.0 0.0\n")
    f.write("0.0 0.0 0.0\n")
    f.write("0.0\n")
    f.write("0.0\n")

# SETUP.CFG
with open("SETUP.CFG", "w", encoding="ascii") as f:
    f.write("&SETUP\n")
    f.write(" initd = 3,\n")
    f.write(" khmax = 24,\n")
    f.write(" numpar = 10000,\n")
    f.write(" maxpar = 50000,\n")
    f.write(f" efile = '{emit_file}',\n")
    f.write("/\n")

# run model
Path("smoke.bin").unlink(missing_ok=True)

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

# concplot
Path("concplot.html").unlink(missing_ok=True)

with open("LABELS.CFG", "w", encoding="ascii") as f:
    f.write("'TITLE&','### cust_smoke ### &'\n")

run_cmd([
    str(PGM / "exec" / f"concplot{exe_suffix}"),
    "+g1",
    "-ismoke.bin",
    f"-j{PGM / 'graphics' / 'arlmap'}",
    "-c4",
    "-z80",
    "-uug",
    "-n40:40",
    "-v500+200+100+50+20+10"
], "Generating concentration plot")

html_file = OUT / "concplot.html"
if html_file.exists():
    if DSP == "YES":
        webbrowser.open(str(html_file.resolve()))
    else:
        convert_html_to_img(str(html_file), [("smoke_plot.png",1)])

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

# station extraction
with open("samplers.txt", "w", encoding="ascii") as f:
    f.write("Mayo 30.2556 -81.4533\n")

run_cmd([
    str(PGM / "exec" / f"con2stn{exe_suffix}"),
    "-ismoke.bin",
    "-ocon2stn.txt",
    "-r1",
    "-ssamplers.txt"
], "Extracting station concentrations")

if Path("con2stn.txt").exists():
    print(Path("con2stn.txt").read_text(encoding="ascii"))

# timeplot
Path("timeplot.html").unlink(missing_ok=True)

run_cmd([
    str(PGM / "exec" / f"timeplot{exe_suffix}"),
    "+g1",
    "-icon2stn.txt",
    f"-s{met_dir / 'mayo_pm25.txt'}"
], "Generating time series plot", allow_fail=True)

# display
html_file = OUT / "timeplot.html"
if html_file.exists():
    if DSP == "YES":
        webbrowser.open(str(html_file.resolve()))
    else:
        convert_html_to_img(str(html_file), [("smoke_times.png",1)])