// Copyright 2019-2024 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

use std::{
  fs::create_dir_all,
  path::{Path, PathBuf},
};
use ureq::ResponseExt;

use crate::utils::http_utils::{base_ureq_agent, download};

pub const WEBVIEW2_BOOTSTRAPPER_URL: &str = "https://go.microsoft.com/fwlink/p/?LinkId=2124703";
pub const WEBVIEW2_OFFLINE_INSTALLER_X86_URL: &str =
  "https://go.microsoft.com/fwlink/?linkid=2099617";
pub const WEBVIEW2_OFFLINE_INSTALLER_X64_URL: &str =
  "https://go.microsoft.com/fwlink/?linkid=2124701";
pub const WEBVIEW2_URL_PREFIX: &str =
  "https://msedge.sf.dl.delivery.mp.microsoft.com/filestreamingservice/files/";
pub const NSIS_OUTPUT_FOLDER_NAME: &str = "nsis";
pub const NSIS_UPDATER_OUTPUT_FOLDER_NAME: &str = "nsis-updater";
pub const WIX_OUTPUT_FOLDER_NAME: &str = "msi";
pub const WIX_UPDATER_OUTPUT_FOLDER_NAME: &str = "msi-updater";

pub fn webview2_guid_path(url: &str) -> crate::Result<(String, String)> {
  let agent = base_ureq_agent();
  let response = agent.head(url).call().map_err(Box::new)?;
  let final_url = response.get_uri().to_string();
  let remaining_url = final_url.strip_prefix(WEBVIEW2_URL_PREFIX).ok_or_else(|| {
    crate::Error::GenericError(format!(
      "WebView2 URL prefix mismatch. Expected `{WEBVIEW2_URL_PREFIX}`, found `{final_url}`."
    ))
  })?;
  let (guid, filename) = remaining_url.split_once('/').ok_or_else(|| {
    crate::Error::GenericError(format!(
      "WebView2 URL format mismatch. Expected `<GUID>/<FILENAME>`, found `{remaining_url}`."
    ))
  })?;
  Ok((guid.into(), filename.into()))
}

pub fn download_webview2_bootstrapper(base_path: &Path) -> crate::Result<PathBuf> {
  let file_path = base_path.join("MicrosoftEdgeWebview2Setup.exe");
  if !file_path.exists() {
    std::fs::write(&file_path, download(WEBVIEW2_BOOTSTRAPPER_URL)?)?;
  }
  Ok(file_path)
}

pub fn download_webview2_offline_installer(base_path: &Path, arch: &str) -> crate::Result<PathBuf> {
  let url = if arch == "x64" {
    WEBVIEW2_OFFLINE_INSTALLER_X64_URL
  } else {
    WEBVIEW2_OFFLINE_INSTALLER_X86_URL
  };
  let (guid, filename) = webview2_guid_path(url)?;
  let dir_path = base_path.join(guid);
  let file_path = dir_path.join(filename);
  if !file_path.exists() {
    create_dir_all(dir_path)?;
    std::fs::write(&file_path, download(url)?)?;
  }
  Ok(file_path)
}

#[cfg(target_os = "windows")]
pub fn os_bitness<'a>() -> Option<&'a str> {
  use windows_sys::Win32::System::SystemInformation::{
    GetNativeSystemInfo, PROCESSOR_ARCHITECTURE_AMD64, PROCESSOR_ARCHITECTURE_INTEL, SYSTEM_INFO,
  };

  let mut system_info: SYSTEM_INFO = unsafe { std::mem::zeroed() };
  unsafe { GetNativeSystemInfo(&mut system_info) };
  match unsafe { system_info.Anonymous.Anonymous.wProcessorArchitecture } {
    PROCESSOR_ARCHITECTURE_INTEL => Some("x86"),
    PROCESSOR_ARCHITECTURE_AMD64 => Some("x64"),
    _ => None,
  }
}
