"""Per-image-type state probes: status + config (drivers / OS / packages / models)."""

import os
import re
import shutil

import config
from services import fs


# File-name sanitizer for uploads. Strips anything outside [A-Za-z0-9._-]
# so a malicious filename can't break out of the destination directory.
_SAFE_NAME = re.compile(r"[^A-Za-z0-9._-]")


def _safe_filename(name: str) -> str:
    base = os.path.basename(name or "")
    cleaned = _SAFE_NAME.sub("_", base)
    return cleaned or "upload.bin"


def image_status(image_type):
    """Return a dict describing the state of an image type."""
    dp = fs.deploy_path(image_type)
    up = fs.unattend_path(image_type)
    has_content = os.path.isdir(dp) and any(os.scandir(dp)) if os.path.isdir(dp) else False
    has_unattend = os.path.isfile(up)
    return {
        "image_type": image_type,
        "friendly_name": config.FRIENDLY_NAMES.get(image_type, image_type),
        "deploy_path": dp,
        "has_content": has_content,
        "has_unattend": has_unattend,
    }


def load_image_config(image_type):
    """Load all JSON configs for an image and check on-disk presence."""
    ctrl = fs.control_path(image_type)
    tools = fs.tools_path(image_type)

    # --- Drivers (merge HardwareDriver.json + hw_drivers.json) ---
    hw_driver_file = os.path.join(ctrl, "HardwareDriver.json")
    hw_drivers_extra = os.path.join(ctrl, "hw_drivers.json")
    drivers_raw = fs.load_json(hw_driver_file)
    extra_raw = fs.load_json(hw_drivers_extra)

    seen_files = set()
    drivers = []
    for d in drivers_raw + extra_raw:
        fname = (d.get("FileName") or d.get("fileName") or "").lower()
        if fname and fname in seen_files:
            continue
        if fname:
            seen_files.add(fname)
        drivers.append(d)

    for d in drivers:
        fname = d.get("FileName") or d.get("fileName") or ""
        dest = d.get("DestinationDir") or d.get("destinationDir") or ""
        resolved = fs.resolve_destination(dest, image_type)
        if resolved and fname:
            d["_on_disk"] = os.path.isfile(os.path.join(resolved, fname))
        else:
            d["_on_disk"] = False

    # --- Operating Systems ---
    os_file = os.path.join(ctrl, "OperatingSystem.json")
    operating_systems = fs.load_json(os_file)
    for entry in operating_systems:
        osv = entry.get("operatingSystemVersion", {})
        wim = osv.get("wim", {})
        dest = wim.get("DestinationDir") or wim.get("destinationDir") or ""
        resolved = fs.resolve_destination(dest, image_type)
        if resolved:
            entry["_on_disk"] = os.path.isfile(os.path.join(resolved, "install.wim"))
        else:
            entry["_on_disk"] = False

    # --- Packages ---
    pkg_file = os.path.join(ctrl, "packages.json")
    packages = fs.load_json(pkg_file)
    for p in packages:
        fname = p.get("fileName") or p.get("FileName") or ""
        dest = p.get("destinationDir") or p.get("DestinationDir") or ""
        resolved = fs.resolve_destination(dest, image_type)
        if resolved and fname:
            p["_on_disk"] = os.path.isfile(os.path.join(resolved, fname))
        else:
            p["_on_disk"] = False

    # --- Hardware Models (user_selections.json) ---
    us_file = os.path.join(tools, "user_selections.json")
    us_raw = fs.load_json(us_file)
    us_data = us_raw[0] if us_raw and isinstance(us_raw, list) else {}
    hardware_models = us_data.get("HardwareModelSelection", [])
    os_selection = str(us_data.get("OperatingSystemSelection", ""))

    family_lookup = {}
    for d in drivers:
        family = d.get("family", "")
        if family:
            family_lookup[family] = d

    for hm in hardware_models:
        family_id = hm.get("Id", "")
        matched = family_lookup.get(family_id)
        hm["_on_disk"] = matched["_on_disk"] if matched else False

    # --- Orphan drivers: zip files on disk not referenced in any JSON ---
    orphan_drivers = []
    oob_dir = os.path.join(fs.deploy_path(image_type), "Out-of-box Drivers")
    try:
        oob_dir = os.path.realpath(oob_dir)
    except OSError:
        pass
    registered_files = set()
    for d in drivers:
        fname = d.get("FileName") or d.get("fileName") or ""
        if fname:
            registered_files.add(fname.lower())
    if os.path.isdir(oob_dir):
        for dirpath, _dirnames, filenames in os.walk(oob_dir):
            for fn in filenames:
                if fn.lower().endswith(".zip") and fn.lower() not in registered_files:
                    rel = os.path.relpath(os.path.join(dirpath, fn), oob_dir)
                    orphan_drivers.append({"fileName": fn, "relPath": rel})

    return {
        "hardware_models": hardware_models,
        "drivers": drivers,
        "operating_systems": operating_systems,
        "packages": packages,
        "orphan_drivers": orphan_drivers,
        "os_selection": os_selection,
    }


# ---------------------------------------------------------------------------
# Driver / package upload + orphan adoption
# ---------------------------------------------------------------------------

DRIVERS_SUBDIR = "Out-of-box Drivers"
PACKAGES_SUBDIR = "Packages"


def _drivers_dir(image_type: str) -> str:
    return os.path.join(fs.deploy_path(image_type), DRIVERS_SUBDIR)


def _packages_dir(image_type: str) -> str:
    return os.path.join(fs.deploy_path(image_type), PACKAGES_SUBDIR)


def upload_driver(image_type: str, uploaded_file, family: str = "",
                  destination_dir: str = "", overwrite: bool = False) -> dict:
    """Save an uploaded driver .zip into the image's Out-of-box Drivers dir.
    When family + destination_dir are provided, also append a HardwareDriver
    .json entry so the driver is recognized at deploy time. Returns a dict
    describing what landed on disk + whether an entry was registered."""
    fname = _safe_filename(uploaded_file.filename)
    if not fname.lower().endswith(".zip"):
        raise ValueError("Driver upload must be a .zip file")
    dst_dir = _drivers_dir(image_type)
    os.makedirs(dst_dir, exist_ok=True)
    dst_path = os.path.join(dst_dir, fname)
    if os.path.exists(dst_path) and not overwrite:
        raise FileExistsError(f"{fname} already exists in {DRIVERS_SUBDIR}/")
    uploaded_file.save(dst_path)
    registered = False
    if family and destination_dir:
        adopt_orphan(image_type, fname, family, destination_dir)
        registered = True
    return {
        "filename": fname,
        "path": dst_path,
        "registered": registered,
    }


def adopt_orphan(image_type: str, filename: str, family: str,
                 destination_dir: str) -> dict:
    """Append a HardwareDriver.json entry for an existing .zip in the image's
    Out-of-box Drivers dir, so it stops showing up as an orphan + gets
    deployed for the named hardware family. Idempotent: a second adopt with
    the same filename is a no-op."""
    safe_name = _safe_filename(filename)
    drivers_path = _drivers_dir(image_type)
    if not os.path.isfile(os.path.join(drivers_path, safe_name)):
        raise FileNotFoundError(f"{safe_name} not found in {DRIVERS_SUBDIR}/")
    if not family:
        raise ValueError("family is required (matches HardwareModelSelection.Id)")
    if not destination_dir:
        raise ValueError("destination_dir is required")

    ctrl = fs.control_path(image_type)
    hw_file = os.path.join(ctrl, "HardwareDriver.json")
    entries = fs.load_json(hw_file)
    for e in entries:
        if (e.get("FileName") or e.get("fileName") or "").lower() == safe_name.lower():
            return {"filename": safe_name, "already_registered": True}
    entries.append({
        "FileName": safe_name,
        "DestinationDir": destination_dir,
        "family": family,
    })
    fs.save_json(hw_file, entries)
    return {"filename": safe_name, "already_registered": False}


def remove_orphans(image_type: str, filenames: list[str]) -> dict:
    """Delete the named files from Out-of-box Drivers/. Caller is
    responsible for confirming this is what the user wants (orphan files
    have no JSON entry, so deleting them is safe in the sense that nothing
    references them; but they may be stash for future adoption)."""
    drivers_path = _drivers_dir(image_type)
    removed, missing = [], []
    for fn in filenames:
        safe = _safe_filename(fn)
        path = os.path.join(drivers_path, safe)
        if not os.path.isfile(path):
            missing.append(safe)
            continue
        try:
            os.unlink(path)
            removed.append(safe)
        except OSError:
            missing.append(safe)
    return {"removed": removed, "missing": missing}


def upload_package(image_type: str, uploaded_file, destination_dir: str = "",
                   overwrite: bool = False) -> dict:
    """Save an uploaded package (any extension) into the image's Packages
    dir, and append an entry to packages.json when destination_dir is set
    so it deploys at imaging time."""
    fname = _safe_filename(uploaded_file.filename)
    dst_dir = _packages_dir(image_type)
    os.makedirs(dst_dir, exist_ok=True)
    dst_path = os.path.join(dst_dir, fname)
    if os.path.exists(dst_path) and not overwrite:
        raise FileExistsError(f"{fname} already exists in {PACKAGES_SUBDIR}/")
    uploaded_file.save(dst_path)
    registered = False
    if destination_dir:
        ctrl = fs.control_path(image_type)
        pkg_file = os.path.join(ctrl, "packages.json")
        entries = fs.load_json(pkg_file)
        already = any(
            (e.get("fileName") or e.get("FileName") or "").lower() == fname.lower()
            for e in entries
        )
        if not already:
            entries.append({
                "fileName": fname,
                "destinationDir": destination_dir,
            })
            fs.save_json(pkg_file, entries)
            registered = True
    return {
        "filename": fname,
        "path": dst_path,
        "registered": registered,
    }