#!/usr/bin/env python3
#
# src_stat.py --- Source Location Statistics
#                 See HYSPLIT Tutorial Sec. 13.5
#
# Change history:
# 18 Oct 2025 (BB) - standard-aligned, cross-platform version
# 12 Feb 2026 (SZ) - minor edits for style consistency
#                  - 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
# 01 Jul 2026 (SZ) - correct sumstat.txt

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 "src_stats.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")


# -------------------------------------------------------------------
# constants
# -------------------------------------------------------------------
wrk = TTR
met_dir = wrk / "captex"
met_file = "RP198309.gbl"
inp = "srm.bin"

lvl = 10.0
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}'  directory of files\n"
    )

# -------------------------------------------------------------------
# CONTROL
# -------------------------------------------------------------------
with open("CONTROL", "w", encoding="ascii") as f:
    f.write("83 09 01 00\n")
    f.write("3\n")
    f.write(f"40.0 -78.0 {lvl}\n")
    f.write(f"45.0 -70.0 {lvl}\n")
    f.write(f"40.5 -77.5 {lvl}\n")
    f.write("60\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("PMCH\n")
    f.write("1.0\n")
    f.write("60.0\n")
    f.write("83 09 01 00 00\n")
    f.write("1\n")
    f.write("41.0 -73.0\n")
    f.write("0.25 0.25\n")
    f.write("15.0 25.0\n")
    f.write(f".{os.sep}\n")
    f.write(f"{inp}\n")
    f.write("1\n")
    f.write("100\n")
    f.write("83 09 01 00 00\n")
    f.write("83 09 03 12 00\n")
    f.write("00 03 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(" ichem = 1,\n")
    f.write(" khmax = 30,\n")
    f.write(" numpar = 500000,\n")
    f.write(" maxpar = 300000,\n")
    f.write("/\n")

# -------------------------------------------------------------------
# run base model
# -------------------------------------------------------------------
run_cmd([str(PGM / "exec" / "latlon")], "Running latlon")

if not Path(inp).exists():
    run_cmd([str(PGM / "exec" / f"hycs_std{exe_suffix}")], "Running hycs_std")

# -------------------------------------------------------------------
# source location statistics loop
# -------------------------------------------------------------------
Path("sumstat.txt").unlink(missing_ok=True)

with open("CONTROL", "r", encoding="ascii") as f:
    lines = f.readlines()

max_count = int(lines[1])
print(f"Number of sources {max_count}")
for k in range(max_count):
    ln = lines[k + 1]
    parts = ln.split()
    if len(parts) >= 2:
        lat_pt = parts[0]
        lon_pt = parts[1]
        print(lat_pt, lon_pt)
        run_cmd([
            str(PGM / "exec" / "matrix"),
            f"-i{inp}",
            "-oSRM_cdump",
            f"-y{lat_pt}",
            f"-x{lon_pt}",
            "-ms"
        ])
        run_cmd([
            str(PGM / "exec" / "c2datem"),
            "-iSRM_cdump",
            "-ohysplit.txt",
            "-c1.0E+15",
            f"-m{met_dir}{os.sep}hypo_meas.txt",
            "-xi",
            "-s"
        ])
        run_cmd([
            str(PGM / "exec" / "statmain"),
            "-t0",
            "-rhysplit.txt",
            f"-d{met_dir}{os.sep}hypo_meas.txt",
            "-o1",
            "-ssumstat.txt"
        ])

# -------------------------------------------------------------------
# grid statistics
# -------------------------------------------------------------------
run_cmd([
    str(PGM / "exec" / "stat2grid"),
    "-isumstat.txt",
    "-ostatmap.bin",
    "-v3"
])

with open("LABELS.CFG", "w", encoding="ascii") as f:
    f.write("'TITLE&','### src_stat: spatial statistics for CC ### &'\n")
    f.write("'UNITS&',' &'\n")
    f.write("'VOLUM&',' &'\n")

Path("gridplot.html").unlink(missing_ok=True)

run_cmd([
    str(PGM / "exec" / "gridplot"),
    "+g1",
    "-istatmap.bin",
    f"-j{PGM}{os.sep}graphics{os.sep}arlmap",
    "-ogridplot.html",
    "-l0.0",
    "-d0.05",
    "-a0",
    "-c1.0"
])

html = Path("gridplot.html")
if html.exists():
    if DSP.upper() == "YES":
        try:
            webbrowser.open(html.resolve().as_uri())
        except Exception as e:
            print(f"WARNING: could not open {html} in web browser: {e}")
    else:
        convert_html_to_img(str(html), [("srs003.png",1)])

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

with open("sumstat.txt", "r", encoding="ascii", errors="ignore") as f:
    print(f.read())

# -------------------------------------------------------------------
# single-point diagnostics
# -------------------------------------------------------------------
run_cmd([
    str(PGM / "exec" / "matrix"),
    f"-i{inp}",
    "-oSRM_cdump",
    "-y43.0",
    "-x-75.0",
    "-ms"
])

run_cmd([
    str(PGM / "exec" / "c2datem"),
    "-iSRM_cdump",
    "-ohysplit.txt",
    "-c1.0E+15",
    f"-m{met_dir}{os.sep}hypo_meas.txt",
    "-xi"
])

run_cmd([
    str(PGM / "exec" / "statmain"),
    "-t0",
    "-rhysplit.txt",
    f"-d{met_dir}{os.sep}hypo_meas.txt",
    "-o1"
])

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

with open("statA.txt", "r", encoding="ascii", errors="ignore") as f:
    print(f.read())

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

run_cmd([
    str(PGM / "exec" / "scatter"),
    "+g1",
    "-idataA.txt",
    "-p10.0"
])

html = Path("scatter.html")
if html.exists():
    if DSP.upper() == "YES":
        try:
            webbrowser.open(html.resolve().as_uri())
        except Exception as e:
            print(f"WARNING: could not open {html} in web browser: {e}")
    else:
        convert_html_to_img(str(html), [("srs007.png",1)])