// status.rs

//

// Copyright 2020, Georges Racinet <georges.racinets@octobus.net>

//

// This software may be used and distributed according to the terms of the

// GNU General Public License version 2 or any later version.

use crate::error::CommandError;

use crate::ui::Ui;

use crate::utils::path_utils::RelativizePaths;

use clap::{Arg, SubCommand};

use format_bytes::format_bytes;

use hg::config::Config;

use hg::dirstate::has_exec_bit;

use hg::dirstate::status::StatusPath;

use hg::dirstate::TruncatedTimestamp;

use hg::errors::{HgError, IoResultExt};

use hg::lock::LockError;

use hg::manifest::Manifest;

use hg::matchers::{AlwaysMatcher, IntersectionMatcher};

use hg::repo::Repo;

use hg::utils::files::get_bytes_from_os_string;

use hg::utils::files::get_bytes_from_path;

use hg::utils::files::get_path_from_bytes;

use hg::utils::hg_path::{hg_path_to_path_buf, HgPath};

use hg::DirstateStatus;

use hg::PatternFileWarning;

use hg::StatusError;

use hg::StatusOptions;

use hg::{self, narrow, sparse};

use log::info;

use rayon::prelude::*;

use std::io;

use std::path::PathBuf;

pub const HELP_TEXT: &str = "

Show changed files in the working directory

This is a pure Rust version of `hg status`.

Some options might be missing, check the list below.

";

pub fn args() -> clap::App<'static, 'static> {

    SubCommand::with_name("status")

        .alias("st")

        .about(HELP_TEXT)

        .arg(

            Arg::with_name("all")

                .help("show status of all files")

                .short("-A")

                .long("--all"),

        )

        .arg(

            Arg::with_name("modified")

                .help("show only modified files")

                .short("-m")

                .long("--modified"),

        )

        .arg(

            Arg::with_name("added")

                .help("show only added files")

                .short("-a")

                .long("--added"),

        )

        .arg(

            Arg::with_name("removed")

                .help("show only removed files")

                .short("-r")

                .long("--removed"),

        )

        .arg(

            Arg::with_name("clean")

                .help("show only clean files")

                .short("-c")

                .long("--clean"),

        )

        .arg(

            Arg::with_name("deleted")

                .help("show only deleted files")

                .short("-d")

                .long("--deleted"),

        )

        .arg(

            Arg::with_name("unknown")

                .help("show only unknown (not tracked) files")

                .short("-u")

                .long("--unknown"),

        )

        .arg(

            Arg::with_name("ignored")

                .help("show only ignored files")

                .short("-i")

                .long("--ignored"),

        )

        .arg(

            Arg::with_name("copies")

                .help("show source of copied files (DEFAULT: ui.statuscopies)")

                .short("-C")

                .long("--copies"),

        )

        .arg(

            Arg::with_name("no-status")

                .help("hide status prefix")

                .short("-n")

                .long("--no-status"),

        )

        .arg(

            Arg::with_name("verbose")

                .help("enable additional output")

                .short("-v")

                .long("--verbose"),

        )

}

/// Pure data type allowing the caller to specify file states to display

#[derive(Copy, Clone, Debug)]

pub struct DisplayStates {

    pub modified: bool,

    pub added: bool,

    pub removed: bool,

    pub clean: bool,

    pub deleted: bool,

    pub unknown: bool,

    pub ignored: bool,

}

pub const DEFAULT_DISPLAY_STATES: DisplayStates = DisplayStates {

    modified: true,

    added: true,

    removed: true,

    clean: false,

    deleted: true,

    unknown: true,

    ignored: false,

};

pub const ALL_DISPLAY_STATES: DisplayStates = DisplayStates {

    modified: true,

    added: true,

    removed: true,

    clean: true,

    deleted: true,

    unknown: true,

    ignored: true,

};

impl DisplayStates {

    pub fn is_empty(&self) -> bool {

        !(self.modified

            || self.added

            || self.removed

            || self.clean

            || self.deleted

            || self.unknown

            || self.ignored)

    }

}

fn has_unfinished_merge(repo: &Repo) -> Result<bool, CommandError> {

    return Ok(repo.dirstate_parents()?.is_merge());

}

fn has_unfinished_state(repo: &Repo) -> Result<bool, CommandError> {

    // These are all the known values for the [fname] argument of

    // [addunfinished] function in [state.py]

    let known_state_files: &[&str] = &[

        "bisect.state",

        "graftstate",

        "histedit-state",

        "rebasestate",

        "shelvedstate",

        "transplant/journal",

        "updatestate",

    ];

    if has_unfinished_merge(repo)? {

        return Ok(true);

    };

    for f in known_state_files {

        if repo.hg_vfs().join(f).exists() {

            return Ok(true);

        }

    }

    return Ok(false);

}

pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {

    // TODO: lift these limitations

    if invocation

        .config

        .get(b"commands", b"status.terse")

        .is_some()

    {

        return Err(CommandError::unsupported(

            "status.terse is not yet supported with rhg status",

        ));

    }

    let ui = invocation.ui;

    let config = invocation.config;

    let args = invocation.subcommand_args;

    let verbose = !args.is_present("print0")

        && (args.is_present("verbose")

            || config.get_bool(b"ui", b"verbose")?

            || config.get_bool(b"commands", b"status.verbose")?);

    let all = args.is_present("all");

    let display_states = if all {

        // TODO when implementing `--quiet`: it excludes clean files

        // from `--all`

        ALL_DISPLAY_STATES

    } else {

        let requested = DisplayStates {

            modified: args.is_present("modified"),

            added: args.is_present("added"),

            removed: args.is_present("removed"),

            clean: args.is_present("clean"),

            deleted: args.is_present("deleted"),

            unknown: args.is_present("unknown"),

            ignored: args.is_present("ignored"),

        };

        if requested.is_empty() {

            DEFAULT_DISPLAY_STATES

        } else {

            requested

        }

    };

    let no_status = args.is_present("no-status");

    let list_copies = all

        || args.is_present("copies")

        || config.get_bool(b"ui", b"statuscopies")?;

    let repo = invocation.repo?;

    if verbose {

        if has_unfinished_state(repo)? {

            return Err(CommandError::unsupported(

                "verbose status output is not supported by rhg (and is needed because we're in an unfinished operation)",

            ));

        };

    }

    let mut dmap = repo.dirstate_map_mut()?;

    let options = StatusOptions {

        // we're currently supporting file systems with exec flags only

        // anyway

        check_exec: true,

        list_clean: display_states.clean,

        list_unknown: display_states.unknown,

        list_ignored: display_states.ignored,

        list_copies,

        collect_traversed_dirs: false,

    };

    type StatusResult<'a> =

        Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError>;

    let after_status = |res: StatusResult| -> Result<_, CommandError> {

        let (mut ds_status, pattern_warnings) = res?;

        for warning in pattern_warnings {

            ui.write_stderr(&print_pattern_file_warning(&warning, &repo))?;

        }

        for (path, error) in ds_status.bad {

            let error = match error {

                hg::BadMatch::OsError(code) => {

                    std::io::Error::from_raw_os_error(code).to_string()

                }

                hg::BadMatch::BadType(ty) => {

                    format!("unsupported file type (type is {})", ty)

                }

            };

            ui.write_stderr(&format_bytes!(

                b"{}: {}\n",

                path.as_bytes(),

                error.as_bytes()

            ))?

        }

        if !ds_status.unsure.is_empty() {

            info!(

                "Files to be rechecked by retrieval from filelog: {:?}",

                ds_status.unsure.iter().map(|s| &s.path).collect::<Vec<_>>()

            );

        }

        let mut fixup = Vec::new();

        if !ds_status.unsure.is_empty()

            && (display_states.modified || display_states.clean)

        {

            let p1 = repo.dirstate_parents()?.p1;

            let manifest = repo.manifest_for_node(p1).map_err(|e| {

                CommandError::from((e, &*format!("{:x}", p1.short())))

            })?;

            let working_directory_vfs = repo.working_directory_vfs();

            let store_vfs = repo.store_vfs();

            let res: Vec<_> = ds_status

                .unsure

                .into_par_iter()

                .map(|to_check| {

                    unsure_is_modified(

                        working_directory_vfs,

                        store_vfs,

                        &manifest,

                        &to_check.path,

                    )

                    .map(|modified| (to_check, modified))

                })

                .collect::<Result<_, _>>()?;

            for (status_path, is_modified) in res.into_iter() {

                if is_modified {

                    if display_states.modified {

                        ds_status.modified.push(status_path);

                    }

                } else {

                    if display_states.clean {

                        ds_status.clean.push(status_path.clone());

                    }

                    fixup.push(status_path.path.into_owned())

                }

            }

        }

        let relative_paths = config

            .get_option(b"commands", b"status.relative")?

            .unwrap_or(config.get_bool(b"ui", b"relative-paths")?);

        let output = DisplayStatusPaths {

            ui,

            no_status,

            relativize: if relative_paths {

                Some(RelativizePaths::new(repo)?)

            } else {

                None

            },

        };

        if display_states.modified {

            output.display(b"M ", "status.modified", ds_status.modified)?;

        }

        if display_states.added {

            output.display(b"A ", "status.added", ds_status.added)?;

        }

        if display_states.removed {

            output.display(b"R ", "status.removed", ds_status.removed)?;

        }

        if display_states.deleted {

            output.display(b"! ", "status.deleted", ds_status.deleted)?;

        }

        if display_states.unknown {

            output.display(b"? ", "status.unknown", ds_status.unknown)?;

        }

        if display_states.ignored {

            output.display(b"I ", "status.ignored", ds_status.ignored)?;