#!/usr/bin/env -S uv run
"""Build the desktop GUI application and package it with Velopack.

Usage:
    uv run scripts/guibuild.py

This runs in the project environment where dependencies
are available via pyproject.toml.

This script:
    1. Reads the version from pyproject.toml
    2. Runs `uv build` to produce the wheel/sdist
    3. On Windows/macOS, downloads the ffmpeg binary for bundling
    4. Builds MediaHive using PyInstaller
    5. Packages with Velopack: Setup.exe (Windows), .pkg (macOS),
       .AppImage (Linux), plus the update feed in build/velopack/
       that release.py uploads for in-app auto-updates
    6. On Windows, also creates a portable ZIP (no auto-updates)
"""

import io
import os
import platform
import re
import shutil
import stat
import subprocess
import sys
import urllib.request
import zipfile
from pathlib import Path

import setuptools_scm

# BtbN automated builds always publish a 'latest' tag with this asset.
_FFMPEG_URL = (
    "https://github.com/BtbN/ffmpeg-builds/releases/download/latest"
    "/ffmpeg-master-latest-win64-gpl.zip"
)
_MACOS_ARM64_TOOL_URLS = {
    "ffmpeg": "https://www.osxexperts.net/ffmpeg81arm.zip",
}
_REPO_ROOT = Path(__file__).parent.parent
_ASSETS_DIR = _REPO_ROOT / "mediahive" / "assets"


def _build_cache_dir() -> Path:
    """Return the persistent cross-build cache dir for downloaded tools (CI wipes build/)."""
    if sys.platform == "win32":
        base = os.environ.get("LOCALAPPDATA") or (Path.home() / "AppData" / "Local")
        return Path(base) / "mediahive-build"
    base = os.environ.get("XDG_CACHE_HOME") or (Path.home() / ".cache")
    return Path(base) / "mediahive-build"


_FFMPEG_STAGING = _build_cache_dir() / "ffmpeg"

# Velopack CLI (dotnet tool package). Runs on the machine's .NET runtime; the
# produced Setup.exe/Update.exe are native and need no runtime on end-user
# machines. Pin a version whose tools target an installed .NET major.
_VPK_VERSION = "1.2.158"
_VPK_URL = (
    f"https://api.nuget.org/v3-flatcontainer/vpk/{_VPK_VERSION}"
    f"/vpk.{_VPK_VERSION}.nupkg"
)
_VPK_STAGING = _build_cache_dir() / f"vpk-{_VPK_VERSION}"


def _platform_zip_suffix() -> str:
    machine = platform.machine().lower()
    arch = {
        "x86_64": "x64",
        "amd64": "x64",
        "arm64": "arm64",
        "aarch64": "arm64",
    }.get(machine, machine or "unknown")

    if sys.platform == "win32":
        return "win64"
    if sys.platform == "darwin":
        return f"macos-{arch}"
    return f"linux-{arch}"


def fetch_ffmpeg() -> Path:
    """Download latest ffmpeg.exe from BtbN builds into the persistent build cache."""
    dest = _FFMPEG_STAGING / "ffmpeg.exe"
    if dest.exists():
        print(f"ffmpeg already staged at {dest}, skipping download.")
        return dest

    _FFMPEG_STAGING.mkdir(parents=True, exist_ok=True)
    print(f"Downloading ffmpeg from {_FFMPEG_URL} ...")
    with urllib.request.urlopen(_FFMPEG_URL) as resp:
        data = resp.read()

    print("Extracting ffmpeg.exe ...")
    with zipfile.ZipFile(io.BytesIO(data)) as zf:
        # The zip contains a top-level folder; ffmpeg.exe is under .../bin/
        ffmpeg_entry = next(
            name for name in zf.namelist() if name.endswith("/bin/ffmpeg.exe")
        )
        with zf.open(ffmpeg_entry) as src:
            Path(dest).write_bytes(src.read())

    print(f"ffmpeg staged at {dest} ({dest.stat().st_size // 1024 // 1024} MB)")
    return dest


def fetch_macos_arm64_binaries() -> dict[str, Path]:
    """Download prebuilt macOS arm64 ffmpeg binary into the persistent build cache."""
    if sys.platform != "darwin" or platform.machine().lower() not in {
        "arm64",
        "aarch64",
    }:
        raise RuntimeError("macOS bundling is only supported for arm64 builds")

    _FFMPEG_STAGING.mkdir(parents=True, exist_ok=True)
    staged: dict[str, Path] = {}

    for tool_name, url in _MACOS_ARM64_TOOL_URLS.items():
        dest = _FFMPEG_STAGING / tool_name
        if dest.exists():
            print(f"{tool_name} already staged at {dest}, skipping download.")
            staged[tool_name] = dest
            continue

        print(f"Downloading {tool_name} from {url} ...")
        with urllib.request.urlopen(url) as resp:
            data = resp.read()

        with zipfile.ZipFile(io.BytesIO(data)) as zf:
            entry_name = next(
                name
                for name in zf.namelist()
                if Path(name).name == tool_name and not name.endswith("/")
            )
            with zf.open(entry_name) as src:
                Path(dest).write_bytes(src.read())

        dest.chmod(dest.stat().st_mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)

        # Make the bundled binary runnable when copied out of the zip/app on macOS.
        subprocess.run(["xattr", "-cr", str(dest)], check=False)
        subprocess.run(["codesign", "-f", "-s", "-", str(dest)], check=True)

        staged[tool_name] = dest
        print(
            f"{tool_name} staged at {dest} ({dest.stat().st_size // 1024 // 1024} MB)"
        )

    return staged


def ensure_macos_icon() -> Path:
    """Create mediahive.icns from mediahive.ico when building on macOS."""
    icon_icns = _ASSETS_DIR / "mediahive.icns"
    if icon_icns.exists():
        return icon_icns

    icon_ico = _ASSETS_DIR / "mediahive.ico"
    if not icon_ico.exists():
        raise FileNotFoundError(f"Missing source icon: {icon_ico}")

    iconset_dir = _REPO_ROOT / "build" / "mediahive.iconset"
    iconset_dir.mkdir(parents=True, exist_ok=True)
    base_png = _REPO_ROOT / "build" / "mediahive-icon-1024.png"

    subprocess.run(
        ["sips", "-s", "format", "png", str(icon_ico), "--out", str(base_png)],
        check=True,
    )

    size_entries = [
        (16, "icon_16x16.png"),
        (32, "icon_16x16@2x.png"),
        (32, "icon_32x32.png"),
        (64, "icon_32x32@2x.png"),
        (128, "icon_128x128.png"),
        (256, "icon_128x128@2x.png"),
        (256, "icon_256x256.png"),
        (512, "icon_256x256@2x.png"),
        (512, "icon_512x512.png"),
        (1024, "icon_512x512@2x.png"),
    ]
    for pixels, name in size_entries:
        subprocess.run(
            [
                "sips",
                "-z",
                str(pixels),
                str(pixels),
                str(base_png),
                "--out",
                str(iconset_dir / name),
            ],
            check=True,
        )

    subprocess.run(
        ["iconutil", "-c", "icns", str(iconset_dir), "-o", str(icon_icns)],
        check=True,
    )
    print(f"macOS app icon generated: {icon_icns}")
    return icon_icns


def fetch_vpk() -> Path:
    """Download the Velopack CLI package into the persistent build cache.

    Returns the path to vpk.dll, runnable with `dotnet vpk.dll ...`.
    """
    vpk_dll = _VPK_STAGING / "tools" / "net10.0" / "any" / "vpk.dll"
    if vpk_dll.exists():
        print(f"vpk already staged at {_VPK_STAGING}, skipping download.")
        return vpk_dll

    _VPK_STAGING.mkdir(parents=True, exist_ok=True)
    print(f"Downloading vpk from {_VPK_URL} ...")
    with urllib.request.urlopen(_VPK_URL) as resp:
        data = resp.read()

    with zipfile.ZipFile(io.BytesIO(data)) as zf:
        zf.extractall(_VPK_STAGING)

    if not vpk_dll.exists():
        raise RuntimeError(f"vpk.dll not found in package at {vpk_dll}")
    print(f"vpk staged at {_VPK_STAGING}")
    return vpk_dll


def _dotnet_has_runtime(exe: Path) -> bool:
    """Check that `exe` runs and has Microsoft.NETCore.App >= 8."""
    try:
        result = subprocess.run(
            [str(exe), "--list-runtimes"], capture_output=True, text=True, timeout=30
        )
    except (OSError, subprocess.TimeoutExpired):
        return False
    if result.returncode != 0:
        return False
    for line in result.stdout.splitlines():
        parts = line.split()
        if len(parts) >= 2 and parts[0] == "Microsoft.NETCore.App":
            try:
                if int(parts[1].split(".")[0]) >= 8:
                    return True
            except ValueError:
                continue
    return False


def fetch_dotnet() -> str:
    """Resolve a dotnet host with a modern (>= 8) runtime from the system.

    The .NET SDK is a build prerequisite installed on the build machine —
    downloading a runtime per build is slow and flaky. A plain `dotnet` may
    resolve to a runtime-only installation, and long-running services (CI
    runners) may carry a stale environment without DOTNET_ROOT or scoop
    paths — so probe known locations explicitly.
    """
    exe_name = "dotnet.exe" if sys.platform == "win32" else "dotnet"
    candidates: list[Path] = []
    root = os.environ.get("DOTNET_ROOT")
    if root:
        candidates.append(Path(root) / exe_name)
    which = shutil.which("dotnet")
    if which:
        candidates.append(Path(which))
    if sys.platform == "win32":
        candidates += [
            Path(r"C:\ProgramData\scoop\apps\dotnet-sdk\current") / exe_name,
            Path(r"C:\Program Files\dotnet") / exe_name,
        ]
    elif sys.platform == "darwin":
        candidates += [
            Path("/opt/homebrew/bin") / exe_name,
            Path("/usr/local/share/dotnet") / exe_name,
        ]
    else:
        candidates += [
            Path("/usr/share/dotnet") / exe_name,
            Path("/usr/lib/dotnet") / exe_name,
            Path.home() / ".dotnet" / exe_name,
        ]

    for exe in candidates:
        if exe.exists() and _dotnet_has_runtime(exe):
            print(f"Using dotnet at {exe}")
            return str(exe)

    raise RuntimeError(
        "No dotnet with Microsoft.NETCore.App >= 8 found. "
        "Install the .NET SDK on this build machine "
        "(Windows: `scoop install dotnet-sdk`; macOS: `brew install dotnet-sdk`; "
        "Linux: distro `dotnet-sdk` package or the dotnet-install script)."
    )


def build_velopack(version: str) -> Path:
    """Build the Velopack installer/bundle for this platform.

    Windows: per-user Setup.exe. macOS: .pkg installer. Linux: .AppImage.
    Also produces the update feed (releases.<channel>.json, *.nupkg) in
    build/velopack/ for release.py to upload — in-app auto-updates read it
    from the Gitea release. Velopack installs carry no Mark-of-the-Web, so
    the .NET CLR loads pythonnet/pywebview assemblies that it refuses from
    a downloaded ZIP.
    """
    if sys.platform == "darwin":
        dist_folder = _REPO_ROOT / "build" / "MediaHive.app"
        icon = _ASSETS_DIR / "mediahive.icns"
        rid = "osx-arm64"
        main_exe = "MediaHive"
        artifact_ext = ".pkg"
    elif sys.platform == "win32":
        dist_folder = _REPO_ROOT / "build" / "MediaHive"
        icon = _ASSETS_DIR / "mediahive.ico"
        rid = "win-x64"
        main_exe = "MediaHive.exe"
        artifact_ext = ".exe"
    else:
        dist_folder = _REPO_ROOT / "build" / "MediaHive"
        icon = _ASSETS_DIR / "mediahive.png"
        rid = "linux-x64"
        main_exe = "MediaHive"
        artifact_ext = ".AppImage"
    if not dist_folder.exists():
        raise FileNotFoundError(f"Distribution folder not found: {dist_folder}")

    vpk_dll = fetch_vpk()
    releases_dir = _REPO_ROOT / "build" / "velopack"

    cmd = [
        fetch_dotnet(),
        str(vpk_dll),
        "pack",
        "--packId",
        "MediaHive",
        "--packVersion",
        version,
        "--packDir",
        str(dist_folder),
        "--mainExe",
        main_exe,
        "--packAuthors",
        "MediaHive",
        "--packTitle",
        "MediaHive",
        "--icon",
        str(icon),
        "--runtime",
        rid,
        "--outputDir",
        str(releases_dir),
    ]
    if sys.platform == "darwin":
        cmd += ["--instWelcome", str(_ASSETS_DIR / "macos-installer-welcome.txt")]
    print(f"Running: {' '.join(cmd)}")
    try:
        result = subprocess.run(cmd, cwd=_REPO_ROOT, capture_output=True, text=True)
    except OSError as exc:
        raise RuntimeError(f"vpk failed to start: {exc}") from exc
    if result.returncode != 0:
        raise RuntimeError(
            f"vpk pack failed with exit code {result.returncode}\n"
            f"stdout:\n{result.stdout}\nstderr:\n{result.stderr}"
        )

    setup = next(iter(sorted(releases_dir.glob(f"*Setup*{artifact_ext}"))), None)
    if setup is None:
        setup = next(iter(sorted(releases_dir.glob(f"*{artifact_ext}"))), None)
    if setup is None:
        raise RuntimeError(f"vpk produced no *{artifact_ext} in {releases_dir}")
    if sys.platform == "darwin":
        minimize_macos_installer(setup)
    artifact = (
        _REPO_ROOT
        / "build"
        / f"MediaHive-{version}-{_platform_zip_suffix()}-setup{artifact_ext}"
    )
    artifact.unlink(missing_ok=True)
    setup.rename(artifact)
    return artifact


def minimize_macos_installer(pkg: Path) -> None:
    """Strip the Destination Select page from the Velopack-generated pkg.

    Velopack hardcodes two install domains (currentUserHome + localSystem) in
    the distribution XML, which makes macOS Installer show a Destination
    Select page. With a single domain that page is skipped, leaving Apple's
    minimum: Introduction, Install, Summary. Installs go to /Applications as
    before (the component pkg is non-relocatable with a fixed location).
    """
    expanded = pkg.with_name(pkg.stem + "-expanded")
    shutil.rmtree(expanded, ignore_errors=True)
    subprocess.run(["pkgutil", "--expand", str(pkg), str(expanded)], check=True)
    dist_xml = expanded / "Distribution"
    xml = dist_xml.read_text()
    new_xml, count = re.subn(r"<domains [^>]*/>", '<domains enable_localSystem="true" />', xml)
    if count != 1:
        raise RuntimeError("Unexpected distribution.xml: <domains> not found")
    dist_xml.write_text(new_xml)
    subprocess.run(["pkgutil", "--flatten", str(expanded), str(pkg)], check=True)
    shutil.rmtree(expanded)


def read_version() -> str:
    """Read version via setuptools_scm (same logic as hatch-vcs)."""
    return setuptools_scm.get_version(root=str(_REPO_ROOT))


def build_wheel() -> None:
    """Run uv build to produce the wheel and sdist."""
    repo_root = _REPO_ROOT
    cmd = ["uv", "build"]
    print(f"Running: {' '.join(cmd)}")
    result = subprocess.run(cmd, cwd=repo_root)
    if result.returncode != 0:
        raise RuntimeError(f"uv build failed with exit code {result.returncode}")


def build_executable() -> None:
    """Run PyInstaller to build the desktop GUI app."""
    repo_root = _REPO_ROOT
    spec_file = Path(__file__).parent / "MediaHive.spec"
    cmd = [
        sys.executable,
        "-m",
        "PyInstaller",
        "--noconfirm",
        "--clean",
        "--distpath",
        str(repo_root / "build"),
        "--workpath",
        str(repo_root / "build" / ".pyinstaller-work"),
        str(spec_file),
    ]
    print(f"Running: {' '.join(cmd)}")
    result = subprocess.run(cmd, cwd=repo_root)
    if result.returncode != 0:
        raise RuntimeError(f"PyInstaller failed with exit code {result.returncode}")


def create_zip(version: str) -> Path:
    """Create a version-numbered ZIP file of the build/MediaHive folder."""
    repo_root = _REPO_ROOT
    dist_folder = repo_root / "build" / "MediaHive"

    if not dist_folder.exists():
        raise FileNotFoundError(f"Distribution folder not found: {dist_folder}")

    zip_name = f"MediaHive-{version}-{_platform_zip_suffix()}.zip"
    if sys.platform == "win32":
        # Distinguish from the Velopack installer (MediaHive-*-win64-setup.exe)
        zip_name = zip_name.replace("-win64.zip", "-win64-portable.zip")
    zip_path = repo_root / "build" / zip_name
    zip_path.parent.mkdir(parents=True, exist_ok=True)

    print(f"Creating {zip_path}...")
    shutil.make_archive(
        str(zip_path.with_suffix("")),  # removes .zip so make_archive can add it
        "zip",
        root_dir=str(dist_folder),  # zip contents of MediaHive/, not the folder itself
    )
    return zip_path


def main() -> None:
    # Windows consoles default to cp1252, which can't encode ✓/✗
    sys.stdout.reconfigure(errors="replace")
    sys.stderr.reconfigure(errors="replace")
    try:
        version = read_version()
        print(f"MediaHive version: {version}")

        if sys.platform == "win32":
            fetch_ffmpeg()
        elif sys.platform == "darwin":
            fetch_macos_arm64_binaries()
            ensure_macos_icon()
        else:
            print(
                "Skipping ffmpeg bundling on this platform "
                "(uses system ffmpeg if available)."
            )
        build_wheel()
        build_executable()

        artifacts = [build_velopack(version)]
        if sys.platform == "win32":
            # Velopack-less plain-folder distribution (with MOTW strip)
            artifacts.append(create_zip(version))

        for artifact_path in artifacts:
            print(f"✓ Built successfully: {artifact_path}")
            print(f"  Size: {artifact_path.stat().st_size / (1024 * 1024):.1f} MB")
    except (FileNotFoundError, OSError, RuntimeError, ValueError) as e:
        print(f"✗ Build failed: {e}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()