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// Copyright (c) The cargo-guppy Contributors
// SPDX-License-Identifier: MIT OR Apache-2.0

//! Add and remove dependencies.

use crate::{
    cli_ops::{WorkspaceOp, WorkspaceOps},
    hakari::DepFormatVersion,
    HakariBuilder,
};
use guppy::{
    graph::{DependencyDirection, PackageLink, PackageMetadata, PackageSet},
    VersionReq,
};

impl<'g> HakariBuilder<'g> {
    /// Returns the set of operations that need to be performed to add the workspace-hack
    /// dependency to the given set of workspace crates.
    ///
    /// Also includes remove operations for the workspace-hack dependency from excluded crates.
    ///
    /// Returns `None` if the hakari package wasn't specified at construction time.
    ///
    /// Requires the `cli-support` feature to be enabled.
    pub fn manage_dep_ops(&self, workspace_set: &PackageSet<'g>) -> Option<WorkspaceOps<'g, '_>> {
        let graph = self.graph();
        let hakari_package = self.hakari_package()?;

        let (add_to, remove_from) =
            workspace_set.filter_partition(DependencyDirection::Reverse, |package| {
                let link_opt = package
                    .link_to(hakari_package.id())
                    .expect("valid package ID");
                let should_be_included = !self.is_excluded(package.id()).expect("valid package ID");
                match (link_opt, should_be_included) {
                    (None, true) => Some(true),
                    (Some(_), false) => Some(false),
                    (Some(link), true) => match self.dep_format_version {
                        DepFormatVersion::V1 => None,
                        DepFormatVersion::V2 | DepFormatVersion::V3 | DepFormatVersion::V4 => {
                            needs_update_v2(hakari_package, link).then_some(true)
                        }
                    },
                    (None, false) => None,
                }
            });

        let mut ops = Vec::with_capacity(2);
        if !add_to.is_empty() {
            ops.push(WorkspaceOp::AddDependency {
                name: hakari_package.name(),
                crate_path: hakari_package
                    .source()
                    .workspace_path()
                    .expect("hakari package is in workspace"),
                version: hakari_package.version(),
                dep_format: self.dep_format_version,
                line_style: self.workspace_hack_line_style,
                add_to,
            });
        }
        if !remove_from.is_empty() {
            ops.push(WorkspaceOp::RemoveDependency {
                name: hakari_package.name(),
                remove_from,
            });
        }
        Some(WorkspaceOps::new(graph, ops))
    }

    /// Returns the set of operations that need to be performed to add the workspace-hack
    /// dependency to the given set of workspace crates.
    ///
    /// Returns `None` if the hakari package wasn't specified at construction time.
    ///
    /// Requires the `cli-support` feature to be enabled.
    pub fn add_dep_ops(
        &self,
        workspace_set: &PackageSet<'g>,
        force: bool,
    ) -> Option<WorkspaceOps<'g, '_>> {
        let graph = self.graph();
        let hakari_package = self.hakari_package()?;

        let add_to = if force {
            workspace_set.clone()
        } else {
            workspace_set.filter(DependencyDirection::Reverse, |package| {
                let link_opt = package
                    .link_to(hakari_package.id())
                    .expect("valid package ID");
                match link_opt {
                    Some(link) => needs_update_v2(hakari_package, link),
                    None => true,
                }
            })
        };

        let op = if !add_to.is_empty() {
            Some(WorkspaceOp::AddDependency {
                name: hakari_package.name(),
                version: hakari_package.version(),
                crate_path: hakari_package
                    .source()
                    .workspace_path()
                    .expect("hakari package is in workspace"),
                dep_format: self.dep_format_version,
                line_style: self.workspace_hack_line_style,
                add_to,
            })
        } else {
            None
        };
        Some(WorkspaceOps::new(graph, op))
    }

    /// Returns the set of operations that need to be performed to remove the workspace-hack
    /// dependency from the given set of workspace crates.
    ///
    /// Returns `None` if the hakari package wasn't specified at construction time.
    ///
    /// Requires the `cli-support` feature to be enabled.
    pub fn remove_dep_ops(
        &self,
        workspace_set: &PackageSet<'g>,
        force: bool,
    ) -> Option<WorkspaceOps<'g, '_>> {
        let graph = self.graph();
        let hakari_package = self.hakari_package()?;

        let remove_from = if force {
            workspace_set.clone()
        } else {
            workspace_set.filter(DependencyDirection::Reverse, |package| {
                graph
                    .directly_depends_on(package.id(), hakari_package.id())
                    .expect("valid package ID")
            })
        };

        let op = if !remove_from.is_empty() {
            Some(WorkspaceOp::RemoveDependency {
                name: hakari_package.name(),
                remove_from,
            })
        } else {
            None
        };
        Some(WorkspaceOps::new(graph, op))
    }
}

#[allow(clippy::if_same_then_else, clippy::needless_bool)]
fn needs_update_v2(hakari_package: &PackageMetadata<'_>, link: PackageLink<'_>) -> bool {
    if !link.version_req().matches(hakari_package.version()) {
        // The version number doesn't match: it must be updated.
        true
    } else if link.version_req() == &VersionReq::STAR {
        // The version number isn't specified and force_version is true.
        true
    } else {
        false
    }
}