// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

//! Ensure the OpenVMM repo is `clippy` clean.

use crate::download_lxutil::LxutilArch;
use crate::init_openvmm_magicpath_openhcl_sysroot::OpenvmmSysrootArch;
use crate::run_cargo_build::common::CommonArch;
use crate::run_cargo_build::common::CommonPlatform;
use crate::run_cargo_build::common::CommonProfile;
use crate::run_cargo_build::common::CommonTriple;
use flowey::node::prelude::*;
use flowey_lib_common::run_cargo_build::CargoBuildProfile;
use flowey_lib_common::run_cargo_clippy::CargoPackage;

flowey_request! {
    pub struct Request {
        pub target: target_lexicon::Triple,
        pub profile: CommonProfile,
        pub done: WriteVar<SideEffect>,
        pub also_check_misc_nostd_crates: bool,
    }
}

new_simple_flow_node!(struct Node);

impl SimpleFlowNode for Node {
    type Request = Request;

    fn imports(ctx: &mut ImportCtx<'_>) {
        ctx.import::<crate::build_xtask::Node>();
        ctx.import::<crate::git_checkout_openvmm_repo::Node>();
        ctx.import::<crate::init_openvmm_magicpath_openhcl_sysroot::Node>();
        ctx.import::<crate::init_openvmm_magicpath_lxutil::Node>();
        ctx.import::<crate::install_openvmm_rust_build_essential::Node>();
        ctx.import::<crate::init_cross_build::Node>();
        ctx.import::<flowey_lib_common::install_rust::Node>();
        ctx.import::<flowey_lib_common::install_dist_pkg::Node>();
        ctx.import::<flowey_lib_common::run_cargo_clippy::Node>();
    }

    fn process_request(request: Self::Request, ctx: &mut NodeCtx<'_>) -> anyhow::Result<()> {
        let Request {
            target,
            profile,
            done,
            also_check_misc_nostd_crates,
        } = request;

        let flowey_platform = ctx.platform();
        let flowey_arch = ctx.arch();

        let (boot_target, uefi_target, sysroot_arch, lxutil_arch) = match target.architecture {
            target_lexicon::Architecture::X86_64 => (
                "x86_64-unknown-none",
                "x86_64-unknown-uefi",
                OpenvmmSysrootArch::X64,
                LxutilArch::X86_64,
            ),
            target_lexicon::Architecture::Aarch64(_) => (
                "aarch64-unknown-linux-musl",
                "aarch64-unknown-uefi",
                OpenvmmSysrootArch::Aarch64,
                LxutilArch::Aarch64,
            ),
            arch => anyhow::bail!("unsupported arch {arch}"),
        };

        let mut pre_build_deps = Vec::new();

        // FIXME: this will go away once we have a dedicated cargo .config.toml
        // for the openhcl _bin_. until we have that, we are building _every_
        // musl target using the openhcl toolchain...

        if matches!(target.environment, target_lexicon::Environment::Musl) {
            pre_build_deps.push(
                ctx.reqv(|v| crate::init_openvmm_magicpath_openhcl_sysroot::Request {
                    arch: sysroot_arch,
                    path: v,
                })
                .into_side_effect(),
            );
        }

        // required due to build-scripts in the openvmm repo
        pre_build_deps.push(ctx.reqv(|v| crate::init_openvmm_magicpath_lxutil::Request {
            arch: lxutil_arch,
            done: v,
        }));

        ctx.req(flowey_lib_common::install_rust::Request::InstallTargetTriple(target.clone()));
        if also_check_misc_nostd_crates {
            ctx.req(
                flowey_lib_common::install_rust::Request::InstallTargetTriple(
                    target_lexicon::triple!(uefi_target),
                ),
            );
            ctx.req(
                flowey_lib_common::install_rust::Request::InstallTargetTriple(
                    target_lexicon::triple!(boot_target),
                ),
            );
        }

        pre_build_deps.push(
            ctx.reqv(|v| flowey_lib_common::install_dist_pkg::Request::Install {
                package_names: vec!["libssl-dev".into()],
                done: v,
            }),
        );

        pre_build_deps.push(ctx.reqv(crate::install_openvmm_rust_build_essential::Request));

        // Cross compiling for MacOS isn't supported, but clippy still works
        // with no additional dependencies
        if !matches!(
            target.operating_system,
            target_lexicon::OperatingSystem::Darwin(_)
        ) {
            pre_build_deps.push(
                ctx.reqv(|v| crate::init_cross_build::Request {
                    target: target.clone(),
                    injected_env: v,
                })
                .into_side_effect(),
            );
        }

        let xtask_target = CommonTriple::Common {
            arch: match flowey_arch {
                FlowArch::X86_64 => CommonArch::X86_64,
                FlowArch::Aarch64 => CommonArch::Aarch64,
                arch => anyhow::bail!("unsupported arch {arch}"),
            },
            platform: match flowey_platform {
                FlowPlatform::Windows => CommonPlatform::WindowsMsvc,
                FlowPlatform::Linux(_) => CommonPlatform::LinuxGnu,
                FlowPlatform::MacOs => CommonPlatform::MacOs,
                platform => anyhow::bail!("unsupported platform {platform}"),
            },
        };

        let xtask = ctx.reqv(|v| crate::build_xtask::Request {
            target: xtask_target,
            xtask: v,
        });

        let profile = match profile {
            CommonProfile::Release => CargoBuildProfile::Release,
            CommonProfile::Debug => CargoBuildProfile::Debug,
        };

        let openvmm_repo_path = ctx.reqv(crate::git_checkout_openvmm_repo::req::GetRepoDir);

        let exclude = ctx.emit_rust_stepv("determine clippy exclusions", |ctx| {
            let xtask = xtask.claim(ctx);
            let repo_path = openvmm_repo_path.clone().claim(ctx);
            move |rt| {
                let xtask = rt.read(xtask);
                let repo_path = rt.read(repo_path);

                let mut exclude = vec!["guest_test_uefi".into()];

                // packages depending on libfuzzer-sys are currently x86 only
                if !(matches!(target.architecture, target_lexicon::Architecture::X86_64)
                    && matches!(flowey_arch, FlowArch::X86_64))
                {
                    let xtask_bin = match xtask {
                        crate::build_xtask::XtaskOutput::LinuxBin { bin, dbg: _ } => bin,
                        crate::build_xtask::XtaskOutput::WindowsBin { exe, pdb: _ } => exe,
                    };

                    let sh = xshell::Shell::new()?;
                    sh.change_dir(repo_path);
                    let output = xshell::cmd!(sh, "{xtask_bin} fuzz list --crates").output()?;
                    let output = String::from_utf8(output.stdout)?;

                    let fuzz_crates = output.trim().split('\n').map(|s| s.to_owned());
                    exclude.extend(fuzz_crates);

                    exclude.push("chipset_device_fuzz".into());
                    exclude.push("xtask_fuzz".into());
                }

                // packages requiring openssl-sys won't cross compile for macos
                if matches!(
                    target.operating_system,
                    target_lexicon::OperatingSystem::Darwin(_)
                ) {
                    exclude.extend(
                        ["openssl_kdf", "vmgs_lib", "block_crypto", "disk_crypt"].map(|x| x.into()),
                    );
                }

                Ok(Some(exclude))
            }
        });

        let extra_env = if matches!(
            target.operating_system,
            target_lexicon::OperatingSystem::Darwin(_)
        ) {
            Some(vec![("SPARSE_MMAP_NO_BUILD".into(), "1".into())])
        } else {
            None
        };

        let mut reqs = vec![ctx.reqv(|v| flowey_lib_common::run_cargo_clippy::Request {
            in_folder: openvmm_repo_path.clone(),
            package: CargoPackage::Workspace,
            profile: profile.clone(),
            features: Some(vec!["ci".into()]),
            target,
            extra_env,
            exclude,
            keep_going: true,
            all_targets: true,
            pre_build_deps: pre_build_deps.clone(),
            done: v,
        })];

        if also_check_misc_nostd_crates {
            reqs.push(ctx.reqv(|v| flowey_lib_common::run_cargo_clippy::Request {
                in_folder: openvmm_repo_path.clone(),
                package: CargoPackage::Crate("openhcl_boot".into()),
                profile: profile.clone(),
                features: None,
                target: target_lexicon::triple!(boot_target),
                extra_env: Some(vec![("MINIMAL_RT_BUILD".into(), "1".into())]),
                exclude: ReadVar::from_static(None),
                keep_going: true,
                all_targets: false,
                pre_build_deps: pre_build_deps.clone(),
                done: v,
            }));

            // don't pass --all-targets, since that pulls in a std dependency
            reqs.push(ctx.reqv(|v| flowey_lib_common::run_cargo_clippy::Request {
                in_folder: openvmm_repo_path.clone(),
                package: CargoPackage::Crate("guest_test_uefi".into()),
                profile: profile.clone(),
                features: None,
                target: target_lexicon::triple!(uefi_target),
                extra_env: None,
                exclude: ReadVar::from_static(None),
                keep_going: true,
                all_targets: false,
                pre_build_deps: pre_build_deps.clone(),
                done: v,
            }));
        }

        ctx.emit_side_effect_step(reqs, [done]);

        Ok(())
    }
}
