from pathlib import Path
import importlib.util
import subprocess
import sys
import time

SCRIPT_DIR = Path(__file__).resolve().parent
DOWNLOADER = "src.geo_mask.downloader"
GENERATOR = "src.geo_mask.raster_tile_generator"

STEP_DEPENDENCIES = {
    "Geo Mask Downloader": ("requests",),
    "Geo Mask Raster Generator": ("mercantile", "shapely", "numpy"),
}


def check_dependencies():
    missing = []
    for step_name, modules in STEP_DEPENDENCIES.items():
        missing_modules = [module for module in modules if importlib.util.find_spec(module) is None]
        if missing_modules:
            missing.append(f"{step_name}: {', '.join(missing_modules)}")
    return missing


def run_step(name, module_name):
    print("\n==========================")
    print("Running:", name)
    print("==========================\n")

    start = time.time()
    command = [sys.executable, "-u", "-m", module_name]
    process = subprocess.Popen(
        command,
        cwd=str(SCRIPT_DIR.parent.parent),
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
        text=True,
        bufsize=1,
    )

    assert process.stdout is not None
    for line in process.stdout:
        print(line, end="")

    return_code = process.wait()
    if return_code != 0:
        raise RuntimeError(f"{name} failed with exit code {return_code}")

    print("\nFinished:", name)
    print("Time:", round(time.time() - start, 2), "seconds")


def main():
    print("Geo Mask Pipeline Starting...")
    print("Date:", time.strftime("%Y-%m-%d %H:%M:%S"))

    missing_dependencies = check_dependencies()
    if missing_dependencies:
        print("\n" + "!" * 50)
        print("Pipeline Failed: missing runtime dependencies")
        for item in missing_dependencies:
            print("-", item)
        print("!" * 50)
        raise SystemExit(1)

    run_step("Geo Mask Downloader", DOWNLOADER)
    run_step("Geo Mask Raster Generator", GENERATOR)
    print("\nGeo Mask Pipeline Completed Successfully!")


if __name__ == "__main__":
    main()