#!/usr/bin/env python3
"""Flask web application for managing a GE Aerospace PXE server."""

import copy
import os
import shutil
import subprocess
from pathlib import Path

from flask import (
    Flask,
    flash,
    jsonify,
    redirect,
    render_template,
    request,
    url_for,
)
from lxml import etree

app = Flask(__name__)
app.secret_key = os.environ.get("FLASK_SECRET_KEY", "pxe-manager-dev-key-change-in-prod")

# ---------------------------------------------------------------------------
# Configuration
# ---------------------------------------------------------------------------
SAMBA_SHARE = os.environ.get("SAMBA_SHARE", "/srv/samba/winpeapps")

IMAGE_TYPES = [
    "geastandardpbr",
    "geaengineerpbr",
    "geashopfloorpbr",
    "gestandardlegacy",
    "geengineerlegacy",
    "geshopfloorlegacy",
]

FRIENDLY_NAMES = {
    "geastandardpbr": "GEA Standard PBR",
    "geaengineerpbr": "GEA Engineer PBR",
    "geashopfloorpbr": "GEA Shop Floor PBR",
    "gestandardlegacy": "GE Standard Legacy",
    "geengineerlegacy": "GE Engineer Legacy",
    "geshopfloorlegacy": "GE Shop Floor Legacy",
}

NS = "urn:schemas-microsoft-com:unattend"
WCM = "http://schemas.microsoft.com/WMIConfig/2002/State"
NSMAP = {None: NS, "wcm": WCM}

# Convenience qualified-name helpers
def qn(tag):
    """Return a tag qualified with the default unattend namespace."""
    return f"{{{NS}}}{tag}"

def qwcm(attr):
    """Return an attribute qualified with the wcm namespace."""
    return f"{{{WCM}}}{attr}"


# ---------------------------------------------------------------------------
# Utility helpers
# ---------------------------------------------------------------------------

def deploy_path(image_type):
    """Return the Deploy directory for an image type."""
    return os.path.join(SAMBA_SHARE, image_type, "Deploy")


def unattend_path(image_type):
    """Return the unattend.xml path for an image type."""
    return os.path.join(deploy_path(image_type), "FlatUnattendW10.xml")


def image_status(image_type):
    """Return a dict describing the state of an image type."""
    dp = deploy_path(image_type)
    up = 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": FRIENDLY_NAMES.get(image_type, image_type),
        "deploy_path": dp,
        "has_content": has_content,
        "has_unattend": has_unattend,
    }


def service_status(service_name):
    """Check whether a systemd service is active."""
    try:
        result = subprocess.run(
            ["systemctl", "is-active", service_name],
            capture_output=True,
            text=True,
            timeout=5,
        )
        state = result.stdout.strip()
        return {"name": service_name, "active": state == "active", "state": state}
    except Exception as exc:
        return {"name": service_name, "active": False, "state": str(exc)}


def find_usb_mounts():
    """Return a list of mount-point paths that look like removable media."""
    mounts = []
    try:
        with open("/proc/mounts", "r") as fh:
            for line in fh:
                parts = line.split()
                if len(parts) >= 2:
                    mount_point = parts[1]
                    if mount_point.startswith(("/mnt/", "/media/")):
                        if os.path.isdir(mount_point):
                            mounts.append(mount_point)
    except OSError:
        pass
    return sorted(set(mounts))


# ---------------------------------------------------------------------------
# XML helpers — parse / build unattend.xml
# ---------------------------------------------------------------------------

UNATTEND_TEMPLATE = """\
<?xml version="1.0" encoding="utf-8"?>
<unattend xmlns="urn:schemas-microsoft-com:unattend"
          xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State">
  <settings pass="windowsPE" />
  <settings pass="offlineServicing" />
  <settings pass="specialize" />
  <settings pass="oobeSystem" />
</unattend>
"""


def _find_or_create(parent, tag):
    """Find the first child with *tag* or create it."""
    el = parent.find(tag, namespaces={"": NS})
    if el is None:
        el = etree.SubElement(parent, qn(tag.split("}")[-1]) if "}" not in tag else tag)
    return el


def _settings_pass(root, pass_name):
    """Return the <settings pass="..."> element, creating if needed."""
    for s in root.findall(qn("settings")):
        if s.get("pass") == pass_name:
            return s
    s = etree.SubElement(root, qn("settings"))
    s.set("pass", pass_name)
    return s


def parse_unattend(xml_path):
    """Parse an unattend.xml and return a dict of editable data."""
    data = {
        "driver_paths": [],
        "computer_name": "",
        "registered_organization": "",
        "registered_owner": "",
        "time_zone": "",
        "specialize_commands": [],
        "oobe": {
            "HideEULAPage": "true",
            "HideOEMRegistrationScreen": "true",
            "HideOnlineAccountScreens": "true",
            "HideWirelessSetupInOOBE": "true",
            "HideLocalAccountScreen": "true",
            "NetworkLocation": "Work",
            "ProtectYourPC": "3",
            "SkipUserOOBE": "true",
            "SkipMachineOOBE": "true",
        },
        "firstlogon_commands": [],
        "raw_xml": "",
    }

    if not os.path.isfile(xml_path):
        data["raw_xml"] = UNATTEND_TEMPLATE
        return data

    raw = open(xml_path, "r", encoding="utf-8").read()
    data["raw_xml"] = raw

    try:
        root = etree.fromstring(raw.encode("utf-8"))
    except etree.XMLSyntaxError:
        return data

    ns = {"u": NS}

    # --- offlineServicing: DriverPaths ---
    for dp_el in root.xpath(
        "u:settings[@pass='offlineServicing']//u:PathAndCredentials/u:Path",
        namespaces=ns,
    ):
        if dp_el.text:
            data["driver_paths"].append(dp_el.text.strip())

    # --- specialize: Shell-Setup ---
    for comp in root.xpath(
        "u:settings[@pass='specialize']/u:component",
        namespaces=ns,
    ):
        comp_name = comp.get("name", "")
        if "Shell-Setup" in comp_name:
            for tag, key in [
                ("ComputerName", "computer_name"),
                ("RegisteredOrganization", "registered_organization"),
                ("RegisteredOwner", "registered_owner"),
                ("TimeZone", "time_zone"),
            ]:
                el = comp.find(qn(tag))
                if el is not None and el.text:
                    data[key] = el.text.strip()

    # --- specialize: RunSynchronous commands ---
    for cmd in root.xpath(
        "u:settings[@pass='specialize']//u:RunSynchronousCommand",
        namespaces=ns,
    ):
        order_el = cmd.find(qn("Order"))
        path_el = cmd.find(qn("Path"))
        desc_el = cmd.find(qn("Description"))
        data["specialize_commands"].append({
            "order": order_el.text.strip() if order_el is not None and order_el.text else "",
            "path": path_el.text.strip() if path_el is not None and path_el.text else "",
            "description": desc_el.text.strip() if desc_el is not None and desc_el.text else "",
        })

    # --- oobeSystem ---
    for comp in root.xpath(
        "u:settings[@pass='oobeSystem']/u:component",
        namespaces=ns,
    ):
        comp_name = comp.get("name", "")
        if "OOBE" in comp_name or "Shell-Setup" in comp_name:
            oobe_el = comp.find(qn("OOBE"))
            if oobe_el is not None:
                for child in oobe_el:
                    local = etree.QName(child).localname
                    if local in data["oobe"] and child.text:
                        data["oobe"][local] = child.text.strip()

            # FirstLogonCommands
            flc = comp.find(qn("FirstLogonCommands"))
            if flc is not None:
                for sync in flc.findall(qn("SynchronousCommand")):
                    order_el = sync.find(qn("Order"))
                    cl_el = sync.find(qn("CommandLine"))
                    desc_el = sync.find(qn("Description"))
                    data["firstlogon_commands"].append({
                        "order": order_el.text.strip() if order_el is not None and order_el.text else "",
                        "commandline": cl_el.text.strip() if cl_el is not None and cl_el.text else "",
                        "description": desc_el.text.strip() if desc_el is not None and desc_el.text else "",
                    })

    return data


def build_unattend_xml(form_data):
    """Build a complete unattend.xml string from form data dict."""
    root = etree.Element(qn("unattend"), nsmap=NSMAP)

    # --- windowsPE (empty) ---
    _settings_pass(root, "windowsPE")

    # --- offlineServicing: DriverPaths ---
    offline = _settings_pass(root, "offlineServicing")
    driver_paths = form_data.get("driver_paths", [])
    if driver_paths:
        comp = etree.SubElement(offline, qn("component"))
        comp.set("name", "Microsoft-Windows-PnpCustomizationsNonWinPE")
        comp.set("processorArchitecture", "amd64")
        comp.set("publicKeyToken", "31bf3856ad364e35")
        comp.set("language", "neutral")
        comp.set("versionScope", "nonSxS")
        dp_container = etree.SubElement(comp, qn("DriverPaths"))
        for idx, dp in enumerate(driver_paths, start=1):
            if not dp.strip():
                continue
            pac = etree.SubElement(dp_container, qn("PathAndCredentials"))
            pac.set(qwcm("action"), "add")
            pac.set(qwcm("keyValue"), str(idx))
            path_el = etree.SubElement(pac, qn("Path"))
            path_el.text = dp.strip()

    # --- specialize ---
    spec = _settings_pass(root, "specialize")

    # Shell-Setup component
    shell_comp = etree.SubElement(spec, qn("component"))
    shell_comp.set("name", "Microsoft-Windows-Shell-Setup")
    shell_comp.set("processorArchitecture", "amd64")
    shell_comp.set("publicKeyToken", "31bf3856ad364e35")
    shell_comp.set("language", "neutral")
    shell_comp.set("versionScope", "nonSxS")

    for tag, key in [
        ("ComputerName", "computer_name"),
        ("RegisteredOrganization", "registered_organization"),
        ("RegisteredOwner", "registered_owner"),
        ("TimeZone", "time_zone"),
    ]:
        val = form_data.get(key, "").strip()
        if val:
            el = etree.SubElement(shell_comp, qn(tag))
            el.text = val

    # Deployment / RunSynchronous commands
    spec_cmds = form_data.get("specialize_commands", [])
    if spec_cmds:
        deploy_comp = etree.SubElement(spec, qn("component"))
        deploy_comp.set("name", "Microsoft-Windows-Deployment")
        deploy_comp.set("processorArchitecture", "amd64")
        deploy_comp.set("publicKeyToken", "31bf3856ad364e35")
        deploy_comp.set("language", "neutral")
        deploy_comp.set("versionScope", "nonSxS")
        rs = etree.SubElement(deploy_comp, qn("RunSynchronous"))
        for idx, cmd in enumerate(spec_cmds, start=1):
            if not cmd.get("path", "").strip():
                continue
            rsc = etree.SubElement(rs, qn("RunSynchronousCommand"))
            rsc.set(qwcm("action"), "add")
            order_el = etree.SubElement(rsc, qn("Order"))
            order_el.text = str(idx)
            path_el = etree.SubElement(rsc, qn("Path"))
            path_el.text = cmd["path"].strip()
            desc_el = etree.SubElement(rsc, qn("Description"))
            desc_el.text = cmd.get("description", "").strip()

    # --- oobeSystem ---
    oobe_settings = _settings_pass(root, "oobeSystem")
    oobe_comp = etree.SubElement(oobe_settings, qn("component"))
    oobe_comp.set("name", "Microsoft-Windows-Shell-Setup")
    oobe_comp.set("processorArchitecture", "amd64")
    oobe_comp.set("publicKeyToken", "31bf3856ad364e35")
    oobe_comp.set("language", "neutral")
    oobe_comp.set("versionScope", "nonSxS")

    oobe_el = etree.SubElement(oobe_comp, qn("OOBE"))
    oobe_data = form_data.get("oobe", {})
    for key in [
        "HideEULAPage",
        "HideOEMRegistrationScreen",
        "HideOnlineAccountScreens",
        "HideWirelessSetupInOOBE",
        "HideLocalAccountScreen",
        "NetworkLocation",
        "ProtectYourPC",
        "SkipUserOOBE",
        "SkipMachineOOBE",
    ]:
        val = oobe_data.get(key, "")
        if val:
            child = etree.SubElement(oobe_el, qn(key))
            child.text = str(val)

    # FirstLogonCommands
    fl_cmds = form_data.get("firstlogon_commands", [])
    if fl_cmds:
        flc = etree.SubElement(oobe_comp, qn("FirstLogonCommands"))
        for idx, cmd in enumerate(fl_cmds, start=1):
            if not cmd.get("commandline", "").strip():
                continue
            sc = etree.SubElement(flc, qn("SynchronousCommand"))
            sc.set(qwcm("action"), "add")
            order_el = etree.SubElement(sc, qn("Order"))
            order_el.text = str(idx)
            cl_el = etree.SubElement(sc, qn("CommandLine"))
            cl_el.text = cmd["commandline"].strip()
            desc_el = etree.SubElement(sc, qn("Description"))
            desc_el.text = cmd.get("description", "").strip()

    xml_bytes = etree.tostring(
        root,
        pretty_print=True,
        xml_declaration=True,
        encoding="utf-8",
    )
    return xml_bytes.decode("utf-8")


def _extract_form_data(form):
    """Pull structured data from the submitted form."""
    data = {}

    # Driver paths
    dp_list = form.getlist("driver_path[]")
    data["driver_paths"] = [p for p in dp_list if p.strip()]

    # Machine settings
    data["computer_name"] = form.get("computer_name", "")
    data["registered_organization"] = form.get("registered_organization", "")
    data["registered_owner"] = form.get("registered_owner", "")
    data["time_zone"] = form.get("time_zone", "")

    # Specialize commands
    spec_paths = form.getlist("spec_cmd_path[]")
    spec_descs = form.getlist("spec_cmd_desc[]")
    data["specialize_commands"] = []
    for i in range(len(spec_paths)):
        if spec_paths[i].strip():
            data["specialize_commands"].append({
                "path": spec_paths[i],
                "description": spec_descs[i] if i < len(spec_descs) else "",
            })

    # OOBE settings
    data["oobe"] = {}
    for key in [
        "HideEULAPage",
        "HideOEMRegistrationScreen",
        "HideOnlineAccountScreens",
        "HideWirelessSetupInOOBE",
        "HideLocalAccountScreen",
        "SkipUserOOBE",
        "SkipMachineOOBE",
    ]:
        data["oobe"][key] = form.get(f"oobe_{key}", "false")
    data["oobe"]["NetworkLocation"] = form.get("oobe_NetworkLocation", "Work")
    data["oobe"]["ProtectYourPC"] = form.get("oobe_ProtectYourPC", "3")

    # First logon commands
    fl_cls = form.getlist("fl_cmd_commandline[]")
    fl_descs = form.getlist("fl_cmd_desc[]")
    data["firstlogon_commands"] = []
    for i in range(len(fl_cls)):
        if fl_cls[i].strip():
            data["firstlogon_commands"].append({
                "commandline": fl_cls[i],
                "description": fl_descs[i] if i < len(fl_descs) else "",
            })

    return data


# ---------------------------------------------------------------------------
# Routes — pages
# ---------------------------------------------------------------------------

@app.route("/")
def dashboard():
    images = [image_status(it) for it in IMAGE_TYPES]
    services = [service_status(s) for s in ("dnsmasq", "apache2", "smbd")]
    return render_template(
        "dashboard.html",
        images=images,
        services=services,
        image_types=IMAGE_TYPES,
        friendly_names=FRIENDLY_NAMES,
    )


@app.route("/images/import", methods=["GET", "POST"])
def images_import():
    usb_mounts = find_usb_mounts()
    images = [image_status(it) for it in IMAGE_TYPES]

    if request.method == "POST":
        source = request.form.get("source", "")
        target = request.form.get("target", "")

        if not source or not target:
            flash("Please select both a source and a target image type.", "danger")
            return redirect(url_for("images_import"))

        if target not in IMAGE_TYPES:
            flash("Invalid target image type.", "danger")
            return redirect(url_for("images_import"))

        if not os.path.isdir(source):
            flash(f"Source path does not exist: {source}", "danger")
            return redirect(url_for("images_import"))

        dest = deploy_path(target)
        try:
            os.makedirs(dest, exist_ok=True)
            # Use rsync-style copy: copy contents of source into dest
            for item in os.listdir(source):
                src_item = os.path.join(source, item)
                dst_item = os.path.join(dest, item)
                if os.path.isdir(src_item):
                    if os.path.exists(dst_item):
                        shutil.rmtree(dst_item)
                    shutil.copytree(src_item, dst_item)
                else:
                    shutil.copy2(src_item, dst_item)
            flash(
                f"Successfully imported content from {source} to {FRIENDLY_NAMES.get(target, target)}.",
                "success",
            )
        except Exception as exc:
            flash(f"Import failed: {exc}", "danger")

        return redirect(url_for("images_import"))

    return render_template(
        "import.html",
        usb_mounts=usb_mounts,
        images=images,
        image_types=IMAGE_TYPES,
        friendly_names=FRIENDLY_NAMES,
    )


@app.route("/images/<image_type>/unattend", methods=["GET", "POST"])
def unattend_editor(image_type):
    if image_type not in IMAGE_TYPES:
        flash("Unknown image type.", "danger")
        return redirect(url_for("dashboard"))

    xml_file = unattend_path(image_type)

    if request.method == "POST":
        save_mode = request.form.get("save_mode", "form")

        if save_mode == "raw":
            raw_xml = request.form.get("raw_xml", "")
            # Validate the XML before saving
            try:
                etree.fromstring(raw_xml.encode("utf-8"))
            except etree.XMLSyntaxError as exc:
                flash(f"Invalid XML: {exc}", "danger")
                data = parse_unattend(xml_file)
                data["raw_xml"] = raw_xml
                return render_template(
                    "unattend_editor.html",
                    image_type=image_type,
                    friendly_name=FRIENDLY_NAMES.get(image_type, image_type),
                    data=data,
                    image_types=IMAGE_TYPES,
                    friendly_names=FRIENDLY_NAMES,
                )
            xml_content = raw_xml
        else:
            form_data = _extract_form_data(request.form)
            xml_content = build_unattend_xml(form_data)

        # Write to disk
        try:
            os.makedirs(os.path.dirname(xml_file), exist_ok=True)
            with open(xml_file, "w", encoding="utf-8") as fh:
                fh.write(xml_content)
            flash("unattend.xml saved successfully.", "success")
        except Exception as exc:
            flash(f"Failed to save: {exc}", "danger")

        return redirect(url_for("unattend_editor", image_type=image_type))

    data = parse_unattend(xml_file)
    return render_template(
        "unattend_editor.html",
        image_type=image_type,
        friendly_name=FRIENDLY_NAMES.get(image_type, image_type),
        data=data,
        image_types=IMAGE_TYPES,
        friendly_names=FRIENDLY_NAMES,
    )


# ---------------------------------------------------------------------------
# Routes — API
# ---------------------------------------------------------------------------

@app.route("/api/services")
def api_services():
    services = {s: service_status(s) for s in ("dnsmasq", "apache2", "smbd")}
    return jsonify(services)


@app.route("/api/images")
def api_images():
    images = [image_status(it) for it in IMAGE_TYPES]
    return jsonify(images)


@app.route("/api/images/<image_type>/unattend", methods=["POST"])
def api_save_unattend(image_type):
    if image_type not in IMAGE_TYPES:
        return jsonify({"error": "Unknown image type"}), 404

    xml_file = unattend_path(image_type)
    payload = request.get_json(silent=True)

    if not payload:
        return jsonify({"error": "No JSON body provided"}), 400

    if "raw_xml" in payload:
        raw_xml = payload["raw_xml"]
        try:
            etree.fromstring(raw_xml.encode("utf-8"))
        except etree.XMLSyntaxError as exc:
            return jsonify({"error": f"Invalid XML: {exc}"}), 400
        xml_content = raw_xml
    else:
        try:
            xml_content = build_unattend_xml(payload)
        except Exception as exc:
            return jsonify({"error": f"Failed to build XML: {exc}"}), 400

    try:
        os.makedirs(os.path.dirname(xml_file), exist_ok=True)
        with open(xml_file, "w", encoding="utf-8") as fh:
            fh.write(xml_content)
    except Exception as exc:
        return jsonify({"error": f"Failed to write file: {exc}"}), 500

    return jsonify({"status": "ok", "path": xml_file})


# ---------------------------------------------------------------------------
# Context processor — make data available to all templates
# ---------------------------------------------------------------------------

@app.context_processor
def inject_globals():
    return {
        "all_image_types": IMAGE_TYPES,
        "all_friendly_names": FRIENDLY_NAMES,
    }


# ---------------------------------------------------------------------------
# Main
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000, debug=True)