#![doc = docs_self!()]

use async_trait::async_trait;
use indoc::indoc;
use once_cell::sync::Lazy;
use tap::prelude::*;

use super::{DryRunStrategy, NoCacheStrategy, Pm, PmHelper, PmMode, PromptStrategy, Strategy};
use crate::{config::Config, error::Result, exec::Cmd};

macro_rules! docs_self {
    () => {
        indoc! {"
            The [Homebrew Package Manager](https://brew.sh/).
        "}
    };
}

#[doc = docs_self!()]
#[derive(Debug)]
pub struct Brew {
    cfg: Config,
}

static STRAT_PROMPT: Lazy<Strategy> = Lazy::new(|| Strategy {
    prompt: PromptStrategy::CustomPrompt,
    ..Strategy::default()
});

static STRAT_INSTALL: Lazy<Strategy> = Lazy::new(|| Strategy {
    prompt: PromptStrategy::CustomPrompt,
    no_cache: NoCacheStrategy::Scc,
    ..Strategy::default()
});

impl Brew {
    #[must_use]
    #[allow(missing_docs)]
    pub const fn new(cfg: Config) -> Self {
        Self { cfg }
    }
}

#[async_trait]
impl Pm for Brew {
    /// Gets the name of the package manager.
    fn name(&self) -> &str {
        "brew"
    }

    fn cfg(&self) -> &Config {
        &self.cfg
    }

    /// Q generates a list of installed packages.
    async fn q(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        if kws.is_empty() {
            self.run(Cmd::new(["brew", "list"]).flags(flags)).await
        } else {
            self.qs(kws, flags).await
        }
    }

    /// Qc shows the changelog of a package.
    async fn qc(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.run(Cmd::new(["brew", "log"]).kws(kws).flags(flags))
            .await
    }

    /// Qi displays local package information: name, version, description, etc.
    async fn qi(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.si(kws, flags).await
    }

    /// Qii displays local packages which require X to be installed, aka local
    /// reverse dependencies.
    async fn qii(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        Cmd::new(["brew", "uses", "--installed"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run(cmd))
            .await
    }

    /// Ql displays files provided by local package.
    async fn ql(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        // TODO: it seems that the output of `brew list python` in fish has a mechanism
        // against duplication: /usr/local/Cellar/python/3.6.0/Frameworks/
        // Python.framework/ (1234 files)
        self.run(Cmd::new(["brew", "list"]).kws(kws).flags(flags))
            .await
    }

    /// Qs searches locally installed package for names or descriptions.
    // According to https://www.archlinux.org/pacman/pacman.8.html#_query_options_apply_to_em_q_em_a_id_qo_a,
    // when including multiple search terms, only packages with descriptions
    // matching ALL of those terms are returned.
    async fn qs(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        // ! `brew list` lists all formulae and casks only when using tty.
        self.search_regex(Cmd::new(["brew", "list", "--formula"]).flags(flags), kws)
            .await?;
        if cfg!(target_os = "macos") {
            self.search_regex(Cmd::new(["brew", "list", "--cask"]).flags(flags), kws)
                .await?;
        }

        Ok(())
    }

    /// Qu lists packages which have an update available.
    async fn qu(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.run(Cmd::new(["brew", "outdated"]).kws(kws).flags(flags))
            .await
    }

    /// R removes a single package, leaving all of its dependencies installed.
    async fn r(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        Cmd::new(["brew", "uninstall"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &STRAT_PROMPT))
            .await
    }

    /// Rn removes a package and skips the generation of configuration backup
    /// files.
    async fn rn(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        Cmd::new(["brew", "uninstall", "--zap", "-f"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &STRAT_PROMPT))
            .await
    }

    /// Rns removes a package and its dependencies which are not required by any
    /// other installed package, and skips the generation of configuration
    /// backup files.
    async fn rns(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.rn(kws, flags).await?;
        Cmd::new(["brew", "autoremove"])
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &STRAT_PROMPT))
            .await
    }

    /// Rs removes a package and its dependencies which are not required by any
    /// other installed package, and not explicitly installed by the user.
    async fn rs(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.r(kws, flags).await?;
        Cmd::new(["brew", "autoremove"])
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &STRAT_PROMPT))
            .await
    }

    /// S installs one or more packages by name.
    async fn s(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        Cmd::new(if self.cfg.needed {
            ["brew", "install"]
        } else {
            // If the package is not installed, `brew reinstall` behaves just like `brew
            // install`, so `brew reinstall` matches perfectly the behavior of
            // `pacman -S`.
            ["brew", "reinstall"]
        })
        .kws(kws)
        .flags(flags)
        .pipe(|cmd| self.run_with(cmd, PmMode::default(), &STRAT_INSTALL))
        .await
    }

    /// Sc removes all the cached packages that are not currently installed, and
    /// the unused sync database.
    async fn sc(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        let strat = Strategy {
            dry_run: DryRunStrategy::with_flags(["--dry-run"]),
            prompt: PromptStrategy::CustomPrompt,
            ..Strategy::default()
        };
        Cmd::new(["brew", "cleanup"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &strat))
            .await
    }

    /// Scc removes all files from the cache.
    async fn scc(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        let strat = Strategy {
            dry_run: DryRunStrategy::with_flags(["--dry-run"]),
            prompt: PromptStrategy::CustomPrompt,
            ..Strategy::default()
        };
        Cmd::new(["brew", "cleanup", "-s"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &strat))
            .await
    }

    /// Sccc performs a deeper cleaning of the cache than `Scc` (if applicable).
    async fn sccc(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        let strat = Strategy {
            dry_run: DryRunStrategy::with_flags(["--dry-run"]),
            prompt: PromptStrategy::CustomPrompt,
            ..Strategy::default()
        };
        Cmd::new(["brew", "cleanup", "--prune=all"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &strat))
            .await
    }

    /// Si displays remote package information: name, version, description, etc.
    async fn si(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.run(Cmd::new(["brew", "info"]).kws(kws).flags(flags))
            .await
    }

    /// Sii displays packages which require X to be installed, aka reverse
    /// dependencies.
    async fn sii(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        Cmd::new(["brew", "uses", "--eval-all"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run(cmd))
            .await
    }

    /// Ss searches for package(s) by searching the expression in name,
    /// description, short description.
    async fn ss(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.run(Cmd::new(["brew", "search"]).kws(kws).flags(flags))
            .await
    }

    /// Su updates outdated packages.
    async fn su(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        Cmd::new(["brew", "upgrade"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &STRAT_INSTALL))
            .await
    }

    /// Suy refreshes the local package database, then updates outdated
    /// packages.
    async fn suy(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.sy(&[], flags).await?;
        self.su(kws, flags).await
    }

    /// Sw retrieves all packages from the server, but does not install/upgrade
    /// anything.
    async fn sw(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        Cmd::new(["brew", "fetch"])
            .kws(kws)
            .flags(flags)
            .pipe(|cmd| self.run_with(cmd, PmMode::default(), &STRAT_PROMPT))
            .await
    }

    /// Sy refreshes the local package database.
    async fn sy(&self, kws: &[&str], flags: &[&str]) -> Result<()> {
        self.run(Cmd::new(["brew", "update"]).flags(flags)).await?;
        if !kws.is_empty() {
            self.s(kws, flags).await?;
        }
        Ok(())
    }
}