git-vet 0.3.0

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

use clap::{Parser, Subcommand};

use crate::channel::{
    ChannelError, ChannelTransfer, ChannelTransferKind, DEFAULT_REVIEW_CHANNEL, ReviewChannel,
};
use crate::commands::{
    DiffTarget, DirtyPathHandling, Gate, MarkOptions, StatusMode, StatusTarget, diff_path,
    mark_paths, status, sync_notes, transfer_channel_notes, unmark_paths,
};
use crate::error::AppError;
use crate::git::Git;
use crate::notes::{GitNotesChannelStore, 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 for commands that operate on one selected channel.
    #[arg(long, global = true)]
    channel: Option<String>,
    #[command(subcommand)]
    command: CommandKind,
}

#[derive(Subcommand, Debug)]
enum CommandKind {
    /// Manage local review notes across channels.
    Channel {
        #[command(subcommand)]
        command: ChannelCommand,
    },
    /// 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,
        /// Limit status to tracked files matching these file or directory pathspecs.
        #[arg(value_name = "PATHSPEC")]
        paths: Vec<PathBuf>,
    },
    /// Show the diff that still needs review for a tracked file.
    Diff {
        /// Compare the latest vetted content with the workspace instead of HEAD.
        #[arg(long)]
        workspace: 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,
}

#[derive(Subcommand, Debug)]
enum ChannelCommand {
    /// Copy all local review notes into a new channel.
    Copy {
        /// Channel whose local review notes are copied.
        #[arg(value_name = "SOURCE")]
        source: String,
        /// New channel that receives the copied review notes.
        #[arg(value_name = "DESTINATION")]
        destination: String,
    },
    /// Move all local review notes into a new channel.
    Move {
        /// Channel whose local review notes are moved.
        #[arg(value_name = "SOURCE")]
        source: String,
        /// New channel that receives the moved review notes.
        #[arg(value_name = "DESTINATION")]
        destination: String,
    },
}

pub fn run_cli() -> Result<ExitCode, AppError> {
    let Cli { channel, command } = Cli::parse();
    let git = Git::discover()?;

    match command {
        CommandKind::Channel { command } => run_channel_command(&git, channel.as_deref(), command),
        CommandKind::Mark { paths, allow_dirty } => {
            with_selected_channel(&git, channel.as_deref(), |_, notes| {
                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 } => {
            with_selected_channel(&git, channel.as_deref(), |_, notes| {
                unmark_paths(&git, notes, &paths)?;
                Ok(ExitCode::SUCCESS)
            })
        }
        CommandKind::Status {
            json,
            all,
            check,
            workspace,
            paths,
        } => with_selected_channel(&git, channel.as_deref(), |channel, notes| {
            let target = if workspace {
                StatusTarget::Workspace
            } else {
                StatusTarget::Head
            };
            match status(
                &git,
                notes,
                channel,
                StatusMode {
                    json,
                    all: all || !paths.is_empty(),
                    check,
                    target,
                },
                &paths,
            )? {
                Gate::Open => Ok(ExitCode::SUCCESS),
                Gate::Closed => Ok(ExitCode::from(1)),
            }
        }),
        CommandKind::Diff { path, workspace } => {
            with_selected_channel(&git, channel.as_deref(), |_, notes| {
                let target = if workspace {
                    DiffTarget::Workspace
                } else {
                    DiffTarget::Head
                };
                diff_path(&git, notes, &path, target)?;
                Ok(ExitCode::SUCCESS)
            })
        }
        CommandKind::Sync { remote } => {
            with_selected_channel(&git, channel.as_deref(), |channel, notes| {
                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 => with_selected_channel(&git, channel.as_deref(), |_, notes| {
            notes.prune()?;
            Ok(ExitCode::SUCCESS)
        }),
    }
}

fn run_channel_command(
    git: &Git,
    explicit_channel: Option<&str>,
    command: ChannelCommand,
) -> Result<ExitCode, AppError> {
    let (command_name, kind, source, destination) = match command {
        ChannelCommand::Copy {
            source,
            destination,
        } => (
            "channel copy",
            ChannelTransferKind::Copy,
            source,
            destination,
        ),
        ChannelCommand::Move {
            source,
            destination,
        } => (
            "channel move",
            ChannelTransferKind::Move,
            source,
            destination,
        ),
    };

    if explicit_channel.is_some() {
        return Err(AppError::ChannelOptionNotAllowed {
            command: command_name,
        });
    }

    let source = review_channel_from_input(&source, ReviewChannelSource::TransferSource)?;
    let destination =
        review_channel_from_input(&destination, ReviewChannelSource::TransferDestination)?;
    let transfer = ChannelTransfer::new(kind, source, destination)?;
    let channels = GitNotesChannelStore::new(git);
    transfer_channel_notes(git, &channels, &transfer)?;
    Ok(ExitCode::SUCCESS)
}

fn with_selected_channel<T>(
    git: &Git,
    explicit_channel: Option<&str>,
    operation: impl FnOnce(&ReviewChannel, &GitNotesStore<'_>) -> Result<T, AppError>,
) -> Result<T, AppError> {
    let channel = review_channel_from_selection(explicit_channel, git)?;
    let notes = GitNotesStore::new(git, channel.notes_ref().clone());
    operation(&channel, &notes)
}

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,
    TransferSource,
    TransferDestination,
}

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::TransferSource => format!("from SOURCE argument: {details}"),
        ReviewChannelSource::TransferDestination => {
            format!("from DESTINATION argument: {details}")
        }
        ReviewChannelSource::Cli | ReviewChannelSource::BuiltInDefault => details,
    }
}