// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

use super::{get_app, Target};
use crate::helpers::{config::get as get_tauri_config, template::JsonMap};
use crate::Result;
use handlebars::{Context, Handlebars, Helper, HelperResult, Output, RenderContext, RenderError};
use tauri_mobile::{
  android::{
    config::Config as AndroidConfig, env::Env as AndroidEnv, target::Target as AndroidTarget,
  },
  config::app::App,
  dot_cargo,
  target::TargetTrait as _,
  util::{
    self,
    cli::{Report, TextWrapper},
  },
};

use std::{
  env::{current_dir, var, var_os},
  path::PathBuf,
};

pub fn command(
  target: Target,
  ci: bool,
  reinstall_deps: bool,
  skip_targets_install: bool,
) -> Result<()> {
  let wrapper = TextWrapper::with_splitter(textwrap::termwidth(), textwrap::NoHyphenation);
  exec(
    target,
    &wrapper,
    ci || var_os("CI").is_some(),
    reinstall_deps,
    skip_targets_install,
  )
  .map_err(|e| anyhow::anyhow!("{:#}", e))?;
  Ok(())
}

pub fn configure_cargo(
  app: &App,
  android: Option<(&mut AndroidEnv, &AndroidConfig)>,
) -> Result<()> {
  if let Some((env, config)) = android {
    for target in AndroidTarget::all().values() {
      let config = target.generate_cargo_config(config, env)?;
      let target_var_name = target.triple.replace('-', "_").to_uppercase();
      if let Some(linker) = config.linker {
        env.base.insert_env_var(
          format!("CARGO_TARGET_{target_var_name}_LINKER"),
          linker.into(),
        );
      }
      env.base.insert_env_var(
        format!("CARGO_TARGET_{target_var_name}_RUSTFLAGS"),
        config.rustflags.join(" ").into(),
      );
    }
  }

  let mut dot_cargo = dot_cargo::DotCargo::load(app)?;
  // Mysteriously, builds that don't specify `--target` seem to fight over
  // the build cache with builds that use `--target`! This means that
  // alternating between i.e. `cargo run` and `cargo apple run` would
  // result in clean builds being made each time you switched... which is
  // pretty nightmarish. Specifying `build.target` in `.cargo/config`
  // fortunately has the same effect as specifying `--target`, so now we can
  // `cargo run` with peace of mind!
  //
  // This behavior could be explained here:
  // https://doc.rust-lang.org/cargo/reference/config.html#buildrustflags
  dot_cargo.set_default_target(util::host_target_triple()?);

  dot_cargo.write(app).map_err(Into::into)
}

pub fn exec(
  target: Target,
  wrapper: &TextWrapper,
  #[allow(unused_variables)] non_interactive: bool,
  #[allow(unused_variables)] reinstall_deps: bool,
  skip_targets_install: bool,
) -> Result<App> {
  let tauri_config = get_tauri_config(None)?;
  let tauri_config_guard = tauri_config.lock().unwrap();
  let tauri_config_ = tauri_config_guard.as_ref().unwrap();

  let app = get_app(tauri_config_);

  let (handlebars, mut map) = handlebars(&app);

  let mut args = std::env::args_os();
  let mut binary = args
    .next()
    .map(|bin| {
      let path = PathBuf::from(&bin);
      if path.exists() {
        if let Ok(dir) = current_dir() {
          let absolute_path = util::prefix_path(dir, path);
          return absolute_path.into();
        }
      }
      bin
    })
    .unwrap_or_else(|| std::ffi::OsString::from("cargo"));
  let mut build_args = Vec::new();
  for arg in args {
    let path = PathBuf::from(&arg);
    if path.exists() {
      if let Ok(dir) = current_dir() {
        let absolute_path = util::prefix_path(dir, path);
        build_args.push(absolute_path.to_string_lossy().into_owned());
        continue;
      }
    }
    build_args.push(arg.to_string_lossy().into_owned());
    if arg == "android" || arg == "ios" {
      break;
    }
  }
  build_args.push(target.ide_build_script_name().into());

  let binary_path = PathBuf::from(&binary);
  let bin_stem = binary_path.file_stem().unwrap().to_string_lossy();
  let r = regex::Regex::new("(nodejs|node)\\-?([1-9]*)*$").unwrap();
  if r.is_match(&bin_stem) {
    if let Some(npm_execpath) = var_os("npm_execpath").map(PathBuf::from) {
      let manager_stem = npm_execpath.file_stem().unwrap().to_os_string();
      binary = if manager_stem == "npm-cli" {
        "npm".into()
      } else {
        manager_stem
      };
      if !build_args.is_empty() {
        // remove script path, we'll use `npm_lifecycle_event` instead
        build_args.remove(0);
      }
      if binary == "npm" {
        build_args.insert(0, "--".into());
      }
      build_args.insert(0, var("npm_lifecycle_event").unwrap());
      if binary == "npm" {
        build_args.insert(0, "run".into());
      }
    }
  }

  map.insert("tauri-binary", binary.to_string_lossy());
  map.insert("tauri-binary-args", &build_args);
  map.insert("tauri-binary-args-str", build_args.join(" "));

  let app = match target {
    // Generate Android Studio project
    Target::Android => match AndroidEnv::new() {
      Ok(_env) => {
        let (app, config, metadata) =
          super::android::get_config(Some(app), tauri_config_, &Default::default());
        map.insert("android", &config);
        super::android::project::gen(
          &config,
          &metadata,
          (handlebars, map),
          wrapper,
          skip_targets_install,
        )?;
        app
      }
      Err(err) => {
        if err.sdk_or_ndk_issue() {
          Report::action_request(
            " to initialize Android environment; Android support won't be usable until you fix the issue below and re-run `tauri android init`!",
            err,
          )
          .print(wrapper);
          app
        } else {
          return Err(err.into());
        }
      }
    },
    #[cfg(target_os = "macos")]
    // Generate Xcode project
    Target::Ios => {
      let (app, config, metadata) =
        super::ios::get_config(Some(app), tauri_config_, &Default::default());
      map.insert("apple", &config);
      super::ios::project::gen(
        &config,
        &metadata,
        (handlebars, map),
        wrapper,
        non_interactive,
        reinstall_deps,
        skip_targets_install,
      )?;
      app
    }
  };

  Report::victory(
    "Project generated successfully!",
    "Make cool apps! 🌻 🐕 🎉",
  )
  .print(wrapper);
  Ok(app)
}

fn handlebars(app: &App) -> (Handlebars<'static>, JsonMap) {
  let mut h = Handlebars::new();
  h.register_escape_fn(handlebars::no_escape);

  h.register_helper("html-escape", Box::new(html_escape));
  h.register_helper("join", Box::new(join));
  h.register_helper("quote-and-join", Box::new(quote_and_join));
  h.register_helper(
    "quote-and-join-colon-prefix",
    Box::new(quote_and_join_colon_prefix),
  );
  h.register_helper("snake-case", Box::new(snake_case));
  h.register_helper("reverse-domain", Box::new(reverse_domain));
  h.register_helper(
    "reverse-domain-snake-case",
    Box::new(reverse_domain_snake_case),
  );
  // don't mix these up or very bad things will happen to all of us
  h.register_helper("prefix-path", Box::new(prefix_path));
  h.register_helper("unprefix-path", Box::new(unprefix_path));

  let mut map = JsonMap::default();
  map.insert("app", app);

  (h, map)
}

fn get_str<'a>(helper: &'a Helper) -> &'a str {
  helper
    .param(0)
    .and_then(|v| v.value().as_str())
    .unwrap_or("")
}

fn get_str_array(helper: &Helper, formatter: impl Fn(&str) -> String) -> Option<Vec<String>> {
  helper.param(0).and_then(|v| {
    v.value().as_array().and_then(|arr| {
      arr
        .iter()
        .map(|val| {
          val.as_str().map(
            #[allow(clippy::redundant_closure)]
            |s| formatter(s),
          )
        })
        .collect()
    })
  })
}

fn html_escape(
  helper: &Helper,
  _: &Handlebars,
  _ctx: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  out
    .write(&handlebars::html_escape(get_str(helper)))
    .map_err(Into::into)
}

fn join(
  helper: &Helper,
  _: &Handlebars,
  _: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  out
    .write(
      &get_str_array(helper, |s| s.to_string())
        .ok_or_else(|| RenderError::new("`join` helper wasn't given an array"))?
        .join(", "),
    )
    .map_err(Into::into)
}

fn quote_and_join(
  helper: &Helper,
  _: &Handlebars,
  _: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  out
    .write(
      &get_str_array(helper, |s| format!("{s:?}"))
        .ok_or_else(|| RenderError::new("`quote-and-join` helper wasn't given an array"))?
        .join(", "),
    )
    .map_err(Into::into)
}

fn quote_and_join_colon_prefix(
  helper: &Helper,
  _: &Handlebars,
  _: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  out
    .write(
      &get_str_array(helper, |s| format!("{:?}", format!(":{s}")))
        .ok_or_else(|| {
          RenderError::new("`quote-and-join-colon-prefix` helper wasn't given an array")
        })?
        .join(", "),
    )
    .map_err(Into::into)
}

fn snake_case(
  helper: &Helper,
  _: &Handlebars,
  _: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  use heck::ToSnekCase as _;
  out
    .write(&get_str(helper).to_snek_case())
    .map_err(Into::into)
}

fn reverse_domain(
  helper: &Helper,
  _: &Handlebars,
  _: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  out
    .write(&util::reverse_domain(get_str(helper)))
    .map_err(Into::into)
}

fn reverse_domain_snake_case(
  helper: &Helper,
  _: &Handlebars,
  _: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  use heck::ToSnekCase as _;
  out
    .write(&util::reverse_domain(get_str(helper)).to_snek_case())
    .map_err(Into::into)
}

fn app_root(ctx: &Context) -> Result<&str, RenderError> {
  let app_root = ctx
    .data()
    .get("app")
    .ok_or_else(|| RenderError::new("`app` missing from template data."))?
    .get("root-dir")
    .ok_or_else(|| RenderError::new("`app.root-dir` missing from template data."))?;
  app_root
    .as_str()
    .ok_or_else(|| RenderError::new("`app.root-dir` contained invalid UTF-8."))
}

fn prefix_path(
  helper: &Helper,
  _: &Handlebars,
  ctx: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  out
    .write(
      util::prefix_path(app_root(ctx)?, get_str(helper))
        .to_str()
        .ok_or_else(|| {
          RenderError::new(
            "Either the `app.root-dir` or the specified path contained invalid UTF-8.",
          )
        })?,
    )
    .map_err(Into::into)
}

fn unprefix_path(
  helper: &Helper,
  _: &Handlebars,
  ctx: &Context,
  _: &mut RenderContext,
  out: &mut dyn Output,
) -> HelperResult {
  out
    .write(
      util::unprefix_path(app_root(ctx)?, get_str(helper))
        .map_err(|_| {
          RenderError::new("Attempted to unprefix a path that wasn't in the app root dir.")
        })?
        .to_str()
        .ok_or_else(|| {
          RenderError::new(
            "Either the `app.root-dir` or the specified path contained invalid UTF-8.",
          )
        })?,
    )
    .map_err(Into::into)
}