use dioxus_cli_config::CrateConfig;

use crate::{
    cfg::{ConfigOptsBuild, ConfigOptsServe},
    Result,
};

use super::{desktop, Platform};

static CLIENT_RUST_FLAGS: &str = "-C debuginfo=none -C strip=debuginfo";
// The `opt-level=2` increases build times, but can noticeably decrease time
// between saving changes and being able to interact with an app. The "overall"
// time difference (between having and not having the optimization) can be
// almost imperceptible (~1 s) but also can be very noticeable (~6 s) — depends
// on setup (hardware, OS, browser, idle load).
static SERVER_RUST_FLAGS: &str = "-C opt-level=2";
static DEBUG_RUST_FLAG: &str = "-C debug-assertions";

fn rust_flags(build: &ConfigOptsBuild, base_flags: &str) -> String {
    let mut rust_flags = base_flags.to_string();
    if !build.release {
        rust_flags += " ";
        rust_flags += DEBUG_RUST_FLAG;
    };
    rust_flags
}

pub fn client_rust_flags(build: &ConfigOptsBuild) -> String {
    rust_flags(build, CLIENT_RUST_FLAGS)
}

pub fn server_rust_flags(build: &ConfigOptsBuild) -> String {
    rust_flags(build, SERVER_RUST_FLAGS)
}

pub async fn startup(config: CrateConfig, serve: &ConfigOptsServe) -> Result<()> {
    desktop::startup_with_platform::<FullstackPlatform>(config, serve).await
}

fn start_web_build_thread(
    config: &CrateConfig,
    serve: &ConfigOptsServe,
) -> std::thread::JoinHandle<Result<()>> {
    let serve = serve.clone();
    let target_directory = config.client_target_dir();
    std::fs::create_dir_all(&target_directory).unwrap();
    std::thread::spawn(move || build_web(serve, &target_directory))
}

fn make_desktop_config(config: &CrateConfig, serve: &ConfigOptsServe) -> CrateConfig {
    let mut desktop_config = config.clone();
    desktop_config.target_dir = config.server_target_dir();
    let desktop_feature = serve.server_feature.clone();
    let features = &mut desktop_config.features;
    match features {
        Some(features) => {
            features.push(desktop_feature);
        }
        None => desktop_config.features = Some(vec![desktop_feature]),
    };
    desktop_config
}

struct FullstackPlatform {
    serve: ConfigOptsServe,
    desktop: desktop::DesktopPlatform,
    server_rust_flags: String,
}

impl Platform for FullstackPlatform {
    fn start(config: &CrateConfig, serve: &ConfigOptsServe) -> Result<Self>
    where
        Self: Sized,
    {
        let thread_handle = start_web_build_thread(config, serve);

        let desktop_config = make_desktop_config(config, serve);
        let server_rust_flags = server_rust_flags(&serve.clone().into());
        let desktop = desktop::DesktopPlatform::start_with_options(
            &desktop_config,
            serve,
            Some(server_rust_flags.clone()),
        )?;
        thread_handle
            .join()
            .map_err(|_| anyhow::anyhow!("Failed to join thread"))??;

        Ok(Self {
            desktop,
            serve: serve.clone(),
            server_rust_flags,
        })
    }

    fn rebuild(&mut self, crate_config: &CrateConfig) -> Result<crate::BuildResult> {
        let thread_handle = start_web_build_thread(crate_config, &self.serve);
        let desktop_config = make_desktop_config(crate_config, &self.serve);
        let result = self
            .desktop
            .rebuild_with_options(&desktop_config, Some(self.server_rust_flags.clone()));
        thread_handle
            .join()
            .map_err(|_| anyhow::anyhow!("Failed to join thread"))??;
        result
    }
}

fn build_web(serve: ConfigOptsServe, target_directory: &std::path::Path) -> Result<()> {
    let mut web_config: ConfigOptsBuild = serve.into();
    let web_feature = web_config.client_feature.clone();
    let features = &mut web_config.features;
    match features {
        Some(features) => {
            features.push(web_feature);
        }
        None => web_config.features = Some(vec![web_feature]),
    };
    web_config.platform = Some(dioxus_cli_config::Platform::Web);

    crate::cli::build::Build {
        build: web_config.clone(),
    }
    .build(
        None,
        Some(target_directory),
        Some(client_rust_flags(&web_config)),
    )
}