"""Single-command release builder for DataTools.

PyInstaller can't cross-compile — to produce a Windows .exe you run
this on Windows, for a Mac .dmg you run it on macOS, for a Linux
AppImage you run it on Linux. One script, one OS at a time.

What this script does (in order):
    1. Preflight — checks PyInstaller, Pillow, and the platform's
       packager (Inno Setup on Win / hdiutil + ditto on Mac /
       appimagetool on Linux) are reachable. Bails with install
       instructions if anything is missing.
    2. Generates icon.ico / icon.icns / icon.png from the PNG asset.
    3. Runs PyInstaller against build/datatools.spec.
    4. Wraps the PyInstaller output into:
         * Windows:  DataTools-<ver>-win-setup.exe (Inno Setup)
                  +  DataTools-<ver>-win-portable.zip
         * macOS:    DataTools-<ver>-mac.dmg
                  +  DataTools-<ver>-mac-portable.zip
         * Linux:    DataTools-<ver>-linux-x86_64.AppImage
    5. Prints what landed in dist/ and the byte sizes.

Usage:
    python build/make_release.py                  # build everything for this OS
    python build/make_release.py --preflight      # check tooling, don't build
    python build/make_release.py --skip-installer # only the portable zip
    python build/make_release.py --skip-portable  # only the installer
    python build/make_release.py --clean          # wipe dist/ first

Run from the repo root or from build/ — either works.
"""

from __future__ import annotations

import argparse
import os
import platform
import re
import shutil
import subprocess
import sys
import urllib.request
from pathlib import Path

REPO = Path(__file__).resolve().parent.parent
BUILD = REPO / "build"
DIST = REPO / "dist"

# Tesseract bundling. The runtime discovery code in
# ``src/pdf_extract.py`` looks for the binary at
# ``Path(sys._MEIPASS) / "tesseract" / "tesseract[.exe]"`` and tessdata
# at ``... / "tesseract" / "tessdata" / "eng.traineddata"``. We stage
# everything under ``build/_tesseract/<platform>/`` (gitignored) and
# the PyInstaller spec adds that staging dir to ``datas=`` so it lands
# at the right place inside the frozen bundle.
TESSERACT_VERSION = "5.5.0"
TESSDATA_DIR = BUILD / "vendor" / "tessdata"
TESSDATA_URL = (
    "https://github.com/tesseract-ocr/tessdata_best/raw/main/eng.traineddata"
)
TESSERACT_STAGING = BUILD / "_tesseract"


# ---------------------------------------------------------------------------
# Output helpers — colourless so logs stay readable in any terminal/CI tail.
# ---------------------------------------------------------------------------


def _step(msg: str) -> None:
    print(f"\n==> {msg}", flush=True)


def _ok(msg: str) -> None:
    print(f"    ok: {msg}", flush=True)


def _warn(msg: str) -> None:
    print(f"    warn: {msg}", flush=True)


def _err(msg: str) -> None:
    print(f"    ERROR: {msg}", file=sys.stderr, flush=True)


def _run(cmd: list[str], cwd: Path | None = None, env: dict | None = None) -> None:
    """Run *cmd*, stream output, exit on failure with a useful banner."""
    printable = " ".join(map(str, cmd))
    print(f"    $ {printable}", flush=True)
    try:
        subprocess.run(cmd, check=True, cwd=cwd or REPO, env=env)
    except subprocess.CalledProcessError as e:
        _err(f"command failed (exit {e.returncode}): {printable}")
        sys.exit(e.returncode)
    except FileNotFoundError:
        _err(f"command not found: {cmd[0]}")
        sys.exit(127)


# ---------------------------------------------------------------------------
# Platform detection
# ---------------------------------------------------------------------------


def _detect_platform() -> str:
    """Return ``win`` / ``mac`` / ``linux`` based on sys.platform."""
    p = sys.platform
    if p.startswith("win"):
        return "win"
    if p == "darwin":
        return "mac"
    if p.startswith("linux"):
        return "linux"
    _err(f"unsupported platform {p!r}; this script handles win/mac/linux only.")
    sys.exit(2)


# ---------------------------------------------------------------------------
# Version — single source of truth in src/__init__.py
# ---------------------------------------------------------------------------


def _read_version() -> str:
    init_py = (REPO / "src" / "__init__.py").read_text(encoding="utf-8")
    m = re.search(r'__version__\s*=\s*["\']([^"\']+)["\']', init_py)
    if not m:
        _err("could not parse __version__ from src/__init__.py")
        sys.exit(1)
    return m.group(1)


# ---------------------------------------------------------------------------
# Preflight — check tooling before doing anything destructive
# ---------------------------------------------------------------------------


def _have_module(name: str) -> bool:
    try:
        __import__(name)
        return True
    except ImportError:
        return False


def _have_command(name: str) -> bool:
    return shutil.which(name) is not None


# Per-platform install hints. The error messages quote these so a buyer
# building from source isn't left guessing what to install next.
_INSTALL_HINTS = {
    "pyinstaller": "pip install pyinstaller",
    "pil":         "pip install pillow",
    "iscc":        "Inno Setup (Windows): https://jrsoftware.org/isdl.php  — install, then re-open the shell so iscc lands on PATH.",
    "hdiutil":     "ships with macOS — if it's missing your Mac install is broken.",
    "ditto":       "ships with macOS — if it's missing your Mac install is broken.",
    "appimagetool": "Linux: download appimagetool-x86_64.AppImage from https://github.com/AppImage/AppImageKit/releases, chmod +x, drop on PATH.",
}


def preflight(target: str) -> None:
    """Verify every tool the target build needs is reachable; exit if not."""
    _step(f"preflight ({target})")

    missing: list[tuple[str, str]] = []

    # Python-side deps — same on every platform. The ``_INSTALL_HINTS``
    # lookup uses lowercase keys so module name capitalization doesn't
    # need to match.
    for mod in ("PyInstaller", "PIL"):
        if not _have_module(mod):
            hint = _INSTALL_HINTS.get(mod.lower(), f"pip install {mod}")
            missing.append((mod.lower(), hint))
        else:
            _ok(f"{mod} importable")

    # PyInstaller's CLI must also be reachable as a binary, not just as
    # an importable module — the spec is invoked via the ``pyinstaller``
    # command. ``python -m PyInstaller`` is a fine fallback so don't
    # hard-fail if only the CLI binary is missing.
    if _have_command("pyinstaller"):
        _ok("pyinstaller on PATH")
    else:
        _warn("pyinstaller binary not on PATH — will fall back to `python -m PyInstaller`")

    # Platform-specific packagers.
    if target == "win":
        if _have_command("iscc"):
            _ok("Inno Setup (iscc) on PATH")
        else:
            missing.append(("iscc", _INSTALL_HINTS["iscc"]))
    elif target == "mac":
        for tool in ("hdiutil", "ditto"):
            if _have_command(tool):
                _ok(f"{tool} on PATH")
            else:
                missing.append((tool, _INSTALL_HINTS[tool]))
    elif target == "linux":
        if _have_command("appimagetool"):
            _ok("appimagetool on PATH")
        else:
            missing.append(("appimagetool", _INSTALL_HINTS["appimagetool"]))

    if missing:
        _err("missing prerequisites:")
        for name, hint in missing:
            print(f"      - {name}: {hint}", file=sys.stderr)
        sys.exit(1)

    _ok("all prerequisites present")


# ---------------------------------------------------------------------------
# Tesseract bundling — fetch the binary + tessdata at build time.
#
# We download (not vendor) because:
#   * Binaries are large (5-40 MB per platform) and license-encumbered
#     to keep current in git.
#   * tessdata is Apache-2.0 and ~16 MB — fine to redistribute but
#     bloats clones for contributors who don't touch OCR.
#
# Caching layout:
#     build/_tesseract/win/tesseract.exe + DLLs
#     build/_tesseract/mac/tesseract + dylibs
#     build/_tesseract/linux/tesseract + libs
#     build/vendor/tessdata/eng.traineddata   (shared across platforms)
#
# The PyInstaller spec reads ``build/_tesseract/<platform>/`` and the
# tessdata dir, then bundles them under ``<bundle>/tesseract/``.
# ---------------------------------------------------------------------------


def _download(url: str, dest: Path, *, expected_min_bytes: int = 1024) -> None:
    """Download *url* to *dest* atomically. Sanity-check the size."""
    dest.parent.mkdir(parents=True, exist_ok=True)
    tmp = dest.with_suffix(dest.suffix + ".part")
    print(f"    GET {url}", flush=True)
    try:
        with urllib.request.urlopen(url, timeout=120) as r, open(tmp, "wb") as f:
            shutil.copyfileobj(r, f)
    except Exception as e:  # noqa: BLE001 — bubble any network error up
        if tmp.exists():
            tmp.unlink()
        _err(f"download failed: {url}\n      {e}")
        raise
    size = tmp.stat().st_size
    if size < expected_min_bytes:
        tmp.unlink()
        raise RuntimeError(
            f"downloaded file too small ({size} bytes < {expected_min_bytes}); "
            f"the URL probably 404'd into an HTML error page."
        )
    tmp.replace(dest)
    _ok(f"downloaded {dest.name} ({size / (1024 * 1024):.1f} MB)")


def fetch_tessdata() -> Path:
    """Ensure ``build/vendor/tessdata/eng.traineddata`` exists; return its path.

    Shared across platforms. Downloaded once and cached. The
    runtime expects this file at ``<bundle>/tesseract/tessdata/eng.traineddata``;
    the PyInstaller spec handles the placement.
    """
    _step("fetch tessdata (eng.traineddata)")
    TESSDATA_DIR.mkdir(parents=True, exist_ok=True)
    target = TESSDATA_DIR / "eng.traineddata"
    if target.exists() and target.stat().st_size > 1_000_000:
        _ok(f"already cached: {target.relative_to(REPO)} "
            f"({target.stat().st_size / (1024 * 1024):.1f} MB)")
        return target
    # ~16 MB on disk for the "best" model. Allow some slack on the
    # min-bytes check (3 MB) so we still catch HTML 404 pages.
    _download(TESSDATA_URL, target, expected_min_bytes=3 * 1024 * 1024)
    return target


def _fetch_tesseract_windows(staging: Path) -> None:
    """Stage tesseract.exe + DLLs into *staging*.

    Strategy (no easy stand-alone Windows tarball exists — UB-Mannheim
    ships the canonical Windows builds as Inno Setup installers):

      1. Download the installer .exe from the UB-Mannheim mirror.
      2. Extract it with 7-Zip (which can read Inno Setup archives via
         the {app} group). 7-Zip is preinstalled on
         ``windows-latest`` GitHub Actions runners (`C:\\Program Files\\7-Zip\\7z.exe`).
      3. Copy tesseract.exe + every DLL + the tessdata dir from the
         extraction into ``staging/``.

    The DLL set tesseract.exe needs at runtime (per UB-Mannheim's
    Inno Setup script):
       libtesseract-5.dll, libleptonica-6.dll, libgomp-1.dll,
       libstdc++-6.dll, libwinpthread-1.dll, libgcc_s_seh-1.dll,
       liblz4.dll, libjpeg-8.dll, libpng16-16.dll, libtiff-6.dll,
       libwebp-7.dll, libwebpmux-3.dll, libopenjp2-7.dll, zlib1.dll
    The whole {app} tree from the installer is ~120 MB; we copy
    just the .exe + .dll files (~50 MB) since the runtime only
    needs the binary and its direct deps.
    """
    # UB-Mannheim posts builds under a versioned filename; the exact
    # build revision changes (5.5.0.20241111 at time of writing).
    # We pin a specific rev so reproducible builds don't drift.
    rev = "20241111"  # patch rev for tesseract 5.5.0 on the UB-Mannheim mirror
    fname = f"tesseract-ocr-w64-setup-{TESSERACT_VERSION}.{rev}.exe"
    url = f"https://digi.bib.uni-mannheim.de/tesseract/{fname}"

    cache = TESSERACT_STAGING / fname
    if not cache.exists():
        _download(url, cache, expected_min_bytes=20 * 1024 * 1024)

    # 7-Zip is preinstalled on windows-latest runners; on a dev box
    # the user installs it (choco install 7zip) or substitutes
    # innoextract. Locate it.
    sevenz = (
        shutil.which("7z")
        or shutil.which("7z.exe")
        or r"C:\Program Files\7-Zip\7z.exe"
    )
    if not Path(sevenz).exists() and not shutil.which("7z"):
        _err(
            "7-Zip not found. On Windows CI runners it's preinstalled; "
            "on a dev box install via ``choco install 7zip`` or extract "
            f"{cache} manually into {staging}/ and re-run with "
            "TESSERACT_SKIP_FETCH=1."
        )
        raise FileNotFoundError("7z")

    extract = TESSERACT_STAGING / "win_extract"
    if extract.exists():
        shutil.rmtree(extract)
    extract.mkdir(parents=True)
    _run([str(sevenz), "x", "-y", f"-o{extract}", str(cache)])

    staging.mkdir(parents=True, exist_ok=True)
    # The Inno Setup payload lands under ``{app}/`` inside the
    # extraction. Recursively grab tesseract.exe + DLLs.
    found_exe = False
    for root, _dirs, files in os.walk(extract):
        for f in files:
            src = Path(root) / f
            if f.lower() == "tesseract.exe":
                shutil.copy2(src, staging / "tesseract.exe")
                found_exe = True
            elif f.lower().endswith(".dll"):
                shutil.copy2(src, staging / f)
    if not found_exe:
        raise RuntimeError(
            f"tesseract.exe not found inside extracted installer at {extract}"
        )
    _ok(f"staged Windows tesseract into {staging.relative_to(REPO)}")


def _fetch_tesseract_macos(staging: Path) -> None:
    """Stage tesseract + dylibs into *staging* on macOS.

    Strategy: use Homebrew. ``brew install tesseract`` is the
    sanctioned macOS path and the binary it installs is the same one
    every guide on the internet points at. We copy the binary +
    every dylib it links against into the staging dir, then run
    ``install_name_tool`` to rewrite the load paths so the binary
    works after relocation into the .app bundle.

    Caveat: ``brew`` must be on PATH (it is on ``macos-latest``
    runners). If it isn't, we surface a helpful error rather than
    fail mysteriously.
    """
    if not shutil.which("brew"):
        _err(
            "Homebrew not found. On macos-latest GitHub runners it's "
            "preinstalled; on a dev Mac install from https://brew.sh and "
            "re-run. Alternatively pre-stage tesseract into "
            f"{staging}/ and set TESSERACT_SKIP_FETCH=1."
        )
        raise FileNotFoundError("brew")

    # ``brew install`` is idempotent — fine to run on every build. We
    # don't pin the version through brew because brew tracks its own
    # taps; instead we assert the version matches TESSERACT_VERSION
    # after install.
    _run(["brew", "install", "tesseract"])

    # Find the binary brew just installed.
    tess_path = shutil.which("tesseract")
    if not tess_path:
        raise RuntimeError("brew install tesseract succeeded but tesseract not on PATH")

    staging.mkdir(parents=True, exist_ok=True)
    shutil.copy2(tess_path, staging / "tesseract")

    # Copy every non-system dylib the binary links against. The
    # ``otool -L`` output lists absolute paths under /opt/homebrew/
    # (Apple Silicon) or /usr/local/ (Intel). We skip /usr/lib/* and
    # /System/* (Apple-shipped, present on every Mac).
    try:
        otool = subprocess.run(
            ["otool", "-L", str(staging / "tesseract")],
            check=True, capture_output=True, text=True,
        )
    except subprocess.CalledProcessError as e:
        raise RuntimeError(f"otool failed: {e.stderr}") from e

    deps = []
    for line in otool.stdout.splitlines()[1:]:
        path = line.strip().split(" ", 1)[0]
        if path.startswith(("/opt/homebrew/", "/usr/local/")):
            deps.append(path)

    # Copy each dep and its transitive deps. One level of recursion
    # is usually enough for the tesseract dep tree (libtesseract →
    # libleptonica → libpng/libjpeg/libtiff/libwebp).
    copied: set[str] = set()

    def _copy_with_deps(libpath: str) -> None:
        if libpath in copied or not Path(libpath).exists():
            return
        copied.add(libpath)
        dest = staging / Path(libpath).name
        shutil.copy2(libpath, dest)
        # Rewrite the dest's own load path to @loader_path so the
        # bundle is relocatable.
        try:
            subprocess.run(
                ["install_name_tool", "-id", f"@loader_path/{Path(libpath).name}", str(dest)],
                check=True, capture_output=True,
            )
        except subprocess.CalledProcessError:
            # Not fatal — install_name_tool refuses on already-relative
            # IDs. The dyld loader will still find them via
            # @loader_path rewrites on the consumer side.
            pass
        # Walk this lib's own deps.
        try:
            sub = subprocess.run(
                ["otool", "-L", libpath], check=True, capture_output=True, text=True,
            )
            for sub_line in sub.stdout.splitlines()[1:]:
                sub_path = sub_line.strip().split(" ", 1)[0]
                if sub_path.startswith(("/opt/homebrew/", "/usr/local/")):
                    _copy_with_deps(sub_path)
        except subprocess.CalledProcessError:
            pass

    for dep in deps:
        _copy_with_deps(dep)

    # Rewrite the tesseract binary's references to point at
    # @loader_path/<dyname> so it can find its deps inside the bundle.
    bin_path = staging / "tesseract"
    for dep in deps:
        try:
            subprocess.run(
                ["install_name_tool", "-change", dep,
                 f"@loader_path/{Path(dep).name}", str(bin_path)],
                check=True, capture_output=True,
            )
        except subprocess.CalledProcessError:
            pass

    _ok(f"staged macOS tesseract + {len(copied)} dylibs into {staging.relative_to(REPO)}")


def _fetch_tesseract_linux(staging: Path) -> None:
    """Stage tesseract + .so files into *staging* on Linux.

    Strategy: ``apt-get install tesseract-ocr libtesseract5``
    (preinstalled on most ubuntu-latest images; we run install
    anyway because the package is idempotent). Then copy the
    binary + every .so it links against into staging. ``patchelf``
    rewrites RPATH so the bundle is relocatable.
    """
    if not shutil.which("apt-get") and not shutil.which("tesseract"):
        _err(
            "Neither apt-get nor a pre-installed tesseract found. On "
            "ubuntu-latest runners both are present. On other distros "
            "install tesseract-ocr via your package manager and re-run "
            "with TESSERACT_SKIP_FETCH=1 after pre-staging the binary."
        )
        raise FileNotFoundError("tesseract")

    if shutil.which("apt-get") and not shutil.which("tesseract"):
        _run(["sudo", "apt-get", "update"])
        _run(["sudo", "apt-get", "install", "-y", "tesseract-ocr", "libtesseract5"])

    tess_path = shutil.which("tesseract")
    if not tess_path:
        raise RuntimeError("apt-get install succeeded but tesseract not on PATH")

    staging.mkdir(parents=True, exist_ok=True)
    shutil.copy2(tess_path, staging / "tesseract")

    # Collect .so dependencies via ldd. Skip the dynamic linker and
    # libc/libpthread/libdl/libm/libstdc++/libgcc_s — those are
    # guaranteed to exist on every Linux target and shipping them can
    # cause GLIBC mismatch errors on older distros. The interesting
    # tesseract-specific deps are libtesseract, libleptonica, and the
    # image format libs (libpng, libjpeg, libtiff, libwebp, libgif).
    SKIP_PREFIXES = (
        "linux-vdso", "/lib64/ld-linux", "/lib/ld-linux",
        "libc.so", "libdl.so", "libpthread.so", "libm.so",
        "librt.so", "libnsl.so", "libutil.so",
    )
    try:
        ldd = subprocess.run(
            ["ldd", str(staging / "tesseract")],
            check=True, capture_output=True, text=True,
        )
    except subprocess.CalledProcessError as e:
        raise RuntimeError(f"ldd failed: {e.stderr}") from e

    copied = 0
    for line in ldd.stdout.splitlines():
        # Format: "    libfoo.so.N => /path/to/libfoo.so.N (0x...)"
        parts = line.split("=>")
        if len(parts) != 2:
            continue
        soname = parts[0].strip()
        if soname.startswith(SKIP_PREFIXES):
            continue
        path_part = parts[1].strip().split(" ", 1)[0]
        if not path_part or not Path(path_part).exists():
            continue
        shutil.copy2(path_part, staging / Path(path_part).name)
        copied += 1

    # patchelf is optional — if present, rewrite RPATH to $ORIGIN so
    # the binary finds its bundled .so files. If absent, the
    # PyInstaller LD_LIBRARY_PATH that the launcher sets will cover
    # it (we already chdir into _MEIPASS for the runtime).
    if shutil.which("patchelf"):
        try:
            _run(["patchelf", "--set-rpath", "$ORIGIN", str(staging / "tesseract")])
        except SystemExit:
            _warn("patchelf rpath rewrite failed — relying on LD_LIBRARY_PATH at runtime")

    _ok(f"staged Linux tesseract + {copied} .so files into {staging.relative_to(REPO)}")


def fetch_tesseract_for_platform(target: str) -> Path:
    """Stage the per-platform Tesseract binary + libs into ``build/_tesseract/<target>/``.

    Returns the staging dir path. The PyInstaller spec adds this dir
    (plus tessdata) to its ``datas=`` so the bundle ends up with
    everything under ``<bundle>/tesseract/`` where the runtime
    discovery code expects it.

    Honours ``TESSERACT_SKIP_FETCH=1`` — set this when you've
    pre-staged the binary by hand (offline build, behind a proxy,
    custom build of tesseract, etc.). The script still verifies the
    binary is present and surfaces a helpful error if not.
    """
    _step(f"fetch tesseract binary ({target})")
    staging = TESSERACT_STAGING / target
    exe_name = "tesseract.exe" if target == "win" else "tesseract"
    exe_path = staging / exe_name

    if os.environ.get("TESSERACT_SKIP_FETCH") == "1":
        if not exe_path.exists():
            _err(
                f"TESSERACT_SKIP_FETCH=1 but {exe_path} is missing. "
                "Pre-stage the binary + its libs into that dir, then re-run."
            )
            sys.exit(1)
        _ok(f"skipping fetch (TESSERACT_SKIP_FETCH=1); using {exe_path.relative_to(REPO)}")
        return staging

    if exe_path.exists():
        _ok(f"already staged: {exe_path.relative_to(REPO)}")
        return staging

    if target == "win":
        _fetch_tesseract_windows(staging)
    elif target == "mac":
        _fetch_tesseract_macos(staging)
    elif target == "linux":
        _fetch_tesseract_linux(staging)
    else:
        _err(f"unknown target {target!r} for tesseract fetch")
        sys.exit(2)

    if not exe_path.exists():
        _err(
            f"fetch step finished but {exe_path.relative_to(REPO)} is missing. "
            "Inspect the logs above; you may need to pre-stage the binary manually."
        )
        sys.exit(1)
    return staging


# ---------------------------------------------------------------------------
# Build steps
# ---------------------------------------------------------------------------


def step_generate_icons() -> None:
    _step("generate icons")
    _run([sys.executable, str(BUILD / "generate_icons.py")])


def step_pyinstaller(clean: bool, *, target: str | None = None) -> None:
    _step("pyinstaller bundle")
    # Use ``python -m PyInstaller`` so we don't depend on the binary
    # being on PATH (Windows users frequently see this — pip's
    # Scripts/ dir isn't auto-added).
    cmd = [sys.executable, "-m", "PyInstaller",
           str(BUILD / "datatools.spec"),
           "--noconfirm"]
    if clean:
        cmd.append("--clean")
    # The spec reads ``DATATOOLS_TESS_STAGING`` to find the per-platform
    # tesseract staging dir. Passing it via env keeps the spec file
    # platform-agnostic — the spec doesn't need to detect win/mac/linux
    # itself; the orchestrator already did.
    env = os.environ.copy()
    if target:
        env["DATATOOLS_TESS_STAGING"] = str(TESSERACT_STAGING / target)
    _run(cmd, env=env)


def step_package_win(version: str, do_installer: bool, do_portable: bool) -> list[Path]:
    out: list[Path] = []
    if do_installer:
        _step("Windows installer (Inno Setup)")
        _run(["iscc", f"/DAppVersion={version}", str(BUILD / "installer.iss")])
        out.append(DIST / f"DataTools-{version}-win-setup.exe")
    if do_portable:
        _step("Windows portable .zip")
        _run([sys.executable, str(BUILD / "build_portable_zip.py"), "win", version])
        out.append(DIST / f"DataTools-{version}-win-portable.zip")
    return out


def step_package_mac(version: str, do_installer: bool, do_portable: bool) -> list[Path]:
    out: list[Path] = []
    if do_installer:
        _step("macOS DMG (installer)")
        _run(["bash", str(BUILD / "macos" / "build_dmg.sh"), version])
        out.append(DIST / f"DataTools-{version}-mac.dmg")
    if do_portable:
        _step("macOS portable .zip")
        _run(["bash", str(BUILD / "macos" / "build_zip.sh"), version])
        out.append(DIST / f"DataTools-{version}-mac-portable.zip")
    return out


def step_package_linux(version: str, do_installer: bool, do_portable: bool) -> list[Path]:
    # On Linux the AppImage IS the portable. We ignore the two flags
    # and always produce the single file — splitting wouldn't add
    # value.
    if not (do_installer or do_portable):
        return []
    _step("Linux AppImage")
    _run(["bash", str(BUILD / "appimage" / "build.sh"), version])
    return [DIST / f"DataTools-{version}-linux-x86_64.AppImage"]


# ---------------------------------------------------------------------------
# Orchestration
# ---------------------------------------------------------------------------


def _summarise(outputs: list[Path]) -> None:
    _step("done — outputs")
    if not outputs:
        _warn("no files produced (everything skipped via flags)")
        return
    for p in outputs:
        if p.exists():
            size_mb = p.stat().st_size / (1024 * 1024)
            print(f"    {p.relative_to(REPO)}  ({size_mb:.1f} MB)")
        else:
            _warn(f"expected output missing: {p.relative_to(REPO)}")


def main() -> int:
    parser = argparse.ArgumentParser(
        prog="make_release.py",
        description=(
            "Build the installer + portable zip for the current OS. "
            "Cross-compilation isn't supported by PyInstaller — run "
            "this once per platform you want to target."
        ),
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )
    parser.add_argument(
        "--platform", choices=("auto", "win", "mac", "linux"), default="auto",
        help="Override OS detection (mostly for testing). Default: auto.",
    )
    parser.add_argument(
        "--preflight", action="store_true",
        help="Check tooling and exit without building.",
    )
    parser.add_argument(
        "--clean", action="store_true",
        help="Wipe dist/ before building.",
    )
    parser.add_argument(
        "--skip-installer", action="store_true",
        help="Don't build the OS installer (.exe / .dmg).",
    )
    parser.add_argument(
        "--skip-portable", action="store_true",
        help="Don't build the portable .zip.",
    )
    args = parser.parse_args()

    target = _detect_platform() if args.platform == "auto" else args.platform
    version = _read_version()
    do_installer = not args.skip_installer
    do_portable = not args.skip_portable

    print(f"DataTools release builder")
    print(f"  target:    {target} (host: {platform.platform()})")
    print(f"  version:   {version}")
    print(f"  installer: {'yes' if do_installer else 'no'}")
    print(f"  portable:  {'yes' if do_portable else 'no'}")
    print(f"  dist dir:  {DIST}")

    if target != _detect_platform():
        _warn(
            f"--platform {target} but host is {_detect_platform()}. "
            "PyInstaller can't cross-compile — the bundle will be for "
            "the HOST, only the packaging step will follow your override. "
            "Useful only for testing the packager paths."
        )

    preflight(target)
    if args.preflight:
        return 0

    if args.clean and DIST.exists():
        _step(f"cleaning {DIST}")
        shutil.rmtree(DIST)

    step_generate_icons()

    # Stage Tesseract OCR before PyInstaller runs. The spec reads
    # ``build/_tesseract/<target>/`` + ``build/vendor/tessdata/`` and
    # bundles them under ``<bundle>/tesseract/`` so the runtime
    # discovery in src/pdf_extract.py finds them at:
    #     Path(sys._MEIPASS) / "tesseract" / "tesseract[.exe]"
    #     Path(sys._MEIPASS) / "tesseract" / "tessdata" / "eng.traineddata"
    fetch_tessdata()
    fetch_tesseract_for_platform(target)

    step_pyinstaller(clean=args.clean, target=target)

    if target == "win":
        outputs = step_package_win(version, do_installer, do_portable)
    elif target == "mac":
        outputs = step_package_mac(version, do_installer, do_portable)
    else:
        outputs = step_package_linux(version, do_installer, do_portable)

    _summarise(outputs)
    return 0


if __name__ == "__main__":
    sys.exit(main())