git-vet 0.2.0

use std::path::PathBuf;
use std::process::ExitCode;

use clap::{Parser, Subcommand};

use crate::channel::{ChannelError, DEFAULT_REVIEW_CHANNEL, ReviewChannel};
use crate::commands::{
    DiffTarget, DirtyPathHandling, Gate, MarkOptions, StatusMode, StatusTarget, diff_path,
    mark_paths, status, sync_notes, unmark_paths,
};
use crate::error::AppError;
use crate::git::Git;
use crate::notes::{GitNotesStore, NotesStore};
use crate::sync_progress::SyncProgressReporter;

#[derive(Parser, Debug)]
#[command(
    name = "git-vet",
    version,
    about = "Track human review state for Git-tracked file contents"
)]
pub struct Cli {
    /// Review channel/pipeline to read or write.
    #[arg(long, global = true)]
    channel: Option<String>,
    #[command(subcommand)]
    command: CommandKind,
}

#[derive(Subcommand, Debug)]
enum CommandKind {
    /// Sign off the current HEAD content of tracked files.
    Mark {
        /// Proceed even if target paths have uncommitted working-tree changes.
        #[arg(long)]
        allow_dirty: bool,
        #[arg(required = true)]
        paths: Vec<PathBuf>,
    },
    /// Remove sign-off for the current HEAD content of tracked files.
    Unmark {
        #[arg(required = true)]
        paths: Vec<PathBuf>,
    },
    /// Show review state for tracked files.
    Status {
        /// Emit stable machine-readable JSON.
        #[arg(long)]
        json: bool,
        /// Include files that are already vetted in human-readable output.
        #[arg(long)]
        all: bool,
        /// Exit 1 when any in-scope tracked file is unreviewed.
        #[arg(long)]
        check: bool,
        /// Classify local working-tree contents instead of committed HEAD contents.
        #[arg(long)]
        workspace: bool,
    },
    /// Show the diff that still needs review for a tracked file.
    Diff {
        /// Compare the latest vetted content with the working tree instead of HEAD.
        #[arg(long)]
        worktree: bool,
        path: PathBuf,
    },
    /// Fetch, merge, and push review notes for the selected channel.
    Sync {
        /// Remote to sync with. Overrides vet.syncRemote and origin fallback.
        #[arg(long)]
        remote: Option<String>,
    },
    /// Prune notes for objects that are no longer present.
    Prune,
}

pub fn run_cli() -> Result<ExitCode, AppError> {
    let cli = Cli::parse();
    let git = Git::discover()?;
    let channel = review_channel_from_selection(cli.channel.as_deref(), &git)?;
    let notes = GitNotesStore::new(&git, channel.notes_ref().clone());

    match cli.command {
        CommandKind::Mark { paths, allow_dirty } => {
            let dirty_paths = if allow_dirty {
                DirtyPathHandling::Allow
            } else {
                DirtyPathHandling::Prompt
            };
            mark_paths(&git, &notes, &paths, MarkOptions { dirty_paths })?;
            Ok(ExitCode::SUCCESS)
        }
        CommandKind::Unmark { paths } => {
            unmark_paths(&git, &notes, &paths)?;
            Ok(ExitCode::SUCCESS)
        }
        CommandKind::Status {
            json,
            all,
            check,
            workspace,
        } => {
            let target = if workspace {
                StatusTarget::Workspace
            } else {
                StatusTarget::Head
            };
            match status(
                &git,
                &notes,
                &channel,
                StatusMode {
                    json,
                    all,
                    check,
                    target,
                },
            )? {
                Gate::Open => Ok(ExitCode::SUCCESS),
                Gate::Closed => Ok(ExitCode::from(1)),
            }
        }
        CommandKind::Diff { path, worktree } => {
            let target = if worktree {
                DiffTarget::Worktree
            } else {
                DiffTarget::Head
            };
            diff_path(&git, &notes, &path, target)?;
            Ok(ExitCode::SUCCESS)
        }
        CommandKind::Sync { remote } => {
            let remote = git.select_sync_remote(remote.as_deref())?;
            let mut progress = SyncProgressReporter::from_environment();
            sync_notes(&notes, &channel, &remote, &mut progress)?;
            Ok(ExitCode::SUCCESS)
        }
        CommandKind::Prune => {
            notes.prune()?;
            Ok(ExitCode::SUCCESS)
        }
    }
}

fn review_channel_from_selection(
    explicit: Option<&str>,
    git: &Git,
) -> Result<ReviewChannel, AppError> {
    match explicit {
        Some(input) => review_channel_from_input(input, ReviewChannelSource::Cli),
        None => git.configured_review_channel()?.map_or_else(
            || {
                review_channel_from_input(
                    DEFAULT_REVIEW_CHANNEL,
                    ReviewChannelSource::BuiltInDefault,
                )
            },
            |input| review_channel_from_input(&input, ReviewChannelSource::Config),
        ),
    }
}

#[derive(Clone, Copy, Debug)]
enum ReviewChannelSource {
    Cli,
    Config,
    BuiltInDefault,
}

fn review_channel_from_input(
    input: &str,
    source: ReviewChannelSource,
) -> Result<ReviewChannel, AppError> {
    ReviewChannel::new(input).map_err(|error| channel_error_from_source(input, &error, source))
}

fn channel_error_from_source(
    input: &str,
    error: &ChannelError,
    source: ReviewChannelSource,
) -> AppError {
    AppError::InvalidChannel {
        channel: input.to_owned(),
        details: details_from_source(error.to_string(), source),
    }
}

fn details_from_source(details: String, source: ReviewChannelSource) -> String {
    match source {
        ReviewChannelSource::Config => format!("from git config vet.channel: {details}"),
        ReviewChannelSource::Cli | ReviewChannelSource::BuiltInDefault => details,
    }
}