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use crate::core::compiler::{BuildConfig, CompileMode, TargetInfo};
use crate::core::{PackageSet, Resolve, Workspace};
use crate::ops;
use crate::util::CargoResult;
use crate::util::Config;
use std::collections::HashSet;

pub struct FetchOptions<'a> {
    pub config: &'a Config,
    /// The target arch triple to fetch dependencies for
    pub target: Option<String>,
}

/// Executes `cargo fetch`.
pub fn fetch<'a>(
    ws: &Workspace<'a>,
    options: &FetchOptions<'a>,
) -> CargoResult<(Resolve, PackageSet<'a>)> {
    ws.emit_warnings()?;
    let (packages, resolve) = ops::resolve_ws(ws)?;

    let jobs = Some(1);
    let config = ws.config();
    let build_config = BuildConfig::new(config, jobs, &options.target, CompileMode::Build)?;
    let rustc = config.load_global_rustc(Some(ws))?;
    let target_info = TargetInfo::new(
        config,
        build_config.requested_kind,
        &rustc,
        build_config.requested_kind,
    )?;
    let mut fetched_packages = HashSet::new();
    let mut deps_to_fetch = ws.members().map(|p| p.package_id()).collect::<Vec<_>>();
    let mut to_download = Vec::new();

    while let Some(id) = deps_to_fetch.pop() {
        if !fetched_packages.insert(id) {
            continue;
        }

        to_download.push(id);
        let deps = resolve
            .deps(id)
            .filter(|&(_id, deps)| {
                deps.iter().any(|d| {
                    // If no target was specified then all dependencies can
                    // be fetched.
                    let target = match options.target {
                        Some(ref t) => t,
                        None => return true,
                    };
                    // If this dependency is only available for certain
                    // platforms, make sure we're only fetching it for that
                    // platform.
                    let platform = match d.platform() {
                        Some(p) => p,
                        None => return true,
                    };
                    platform.matches(target, target_info.cfg())
                })
            })
            .map(|(id, _deps)| id);
        deps_to_fetch.extend(deps);
    }
    packages.get_many(to_download)?;

    Ok((resolve, packages))
}