"""Script generator module — renders PowerShell scripts from Jinja2 templates.

Provides render_install(), render_uninstall(), and render_detect() which produce
complete PowerShell scripts for Intune deployment:
- render_install: WOW64 guard, UAC self-elevation, pnputil two-step, idempotent setup
- render_uninstall: Ordered removal of printer, driver, and port
- render_detect: Intune detection contract (Write-Output + exit 0/1)
"""
from pathlib import Path

from jinja2 import Environment, FileSystemLoader

_SCRIPTS_DIR = Path(__file__).parent.parent / "templates" / "scripts"

_env = Environment(
    loader=FileSystemLoader(str(_SCRIPTS_DIR)),
    trim_blocks=True,
    lstrip_blocks=True,
    keep_trailing_newline=True,
)

_duplex_map = {
    "OneSided": "OneSided",
    "LongEdge": "TwoSidedLongEdge",
    "ShortEdge": "TwoSidedShortEdge",
}


def render_install(
    printer_name: str,
    ip_address: str,
    port_name: str,
    driver_name: str,
    inf_filename: str,
    duplex_mode: str,
    color_mode: bool,
    paper_size: str,
    collate: bool,
) -> str:
    """Render install.ps1.j2 with the given printer configuration.

    Args:
        printer_name: Display name of the printer.
        ip_address: IP address for the printer TCP/IP port.
        port_name: Port name (e.g. "IP_192.168.1.10").
        driver_name: Exact driver name as registered in Windows.
        inf_filename: INF filename inside the drivers/ subfolder.
        duplex_mode: One of "OneSided", "LongEdge", "ShortEdge" (model values).
        color_mode: True for color printing, False for mono.
        paper_size: Paper size string (e.g. "A4", "Letter").
        collate: True to enable collation.

    Returns:
        Rendered PowerShell script as a string.
    """
    tpl = _env.get_template("install.ps1.j2")
    return tpl.render(
        printer_name=printer_name,
        ip_address=ip_address,
        port_name=port_name,
        driver_name=driver_name,
        inf_filename=inf_filename,
        duplex_mode=_duplex_map.get(duplex_mode, duplex_mode),
        color=str(color_mode).lower(),
        paper_size=paper_size,
        collate=str(collate).lower(),
    )


def render_uninstall(printer_name: str, driver_name: str, port_name: str) -> str:
    """Render uninstall.ps1.j2 — removes printer, driver, and port in safe order.

    Removal order: Printer first (so driver is no longer referenced), then Driver,
    then Port. All operations use -ErrorAction SilentlyContinue for idempotency.

    Args:
        printer_name: Display name of the printer to remove.
        driver_name: Exact driver name as registered in Windows.
        port_name: Port name (e.g. "IP_192.168.1.10").

    Returns:
        Rendered PowerShell script as a string.
    """
    tpl = _env.get_template("uninstall.ps1.j2")
    return tpl.render(
        printer_name=printer_name,
        driver_name=driver_name,
        port_name=port_name,
    )


def render_detect(printer_name: str) -> str:
    """Render detect.ps1.j2 — Intune detection script.

    Follows the Intune detection contract: Write-Output + exit 0 when printer
    is found, exit 1 when absent. Intune considers exit 0 as "app installed".

    Args:
        printer_name: Display name of the printer to detect.

    Returns:
        Rendered PowerShell script as a string.
    """
    tpl = _env.get_template("detect.ps1.j2")
    return tpl.render(printer_name=printer_name)