//! Command-line definitions and dispatch.

mod format;

mod identity;

mod sync;

pub mod ui;

mod workspace;

use anyhow::{Context, Result};

use clap::{Parser, Subcommand};

use oxy_core::repo::Repo;

use std::path::PathBuf;

#[derive(Parser)]

#[command(name = "oxy", version, about = "Oxygen: breathing fresh air into version control")]

struct Cli {

    /// Plain output: no colour, no spinner (also implied by NO_COLOR or a non-terminal)

    #[arg(long, global = true)]

    plain: bool,

    #[command(subcommand)]

    cmd: Cmd,

}

#[derive(Subcommand)]

enum Cmd {

    /// Create a repository in PATH (default: current directory)

    Init { path: Option<PathBuf> },

    /// Clone a repository from a local path or an http(s) URL

    Clone {

        url: String,

        dest: Option<PathBuf>,

        /// Leave blobs larger than this (e.g. 1M) to be fetched on first read

        #[arg(long)]

        max_blob: Option<String>,

        /// Materialize only these paths (repeatable); implies lazy blobs

        #[arg(long = "sparse")]

        sparse: Vec<String>,

        /// Shallow clone: fetch only this many levels of history below the heads

        #[arg(long)]

        depth: Option<u32>,

    },

    /// Fetch more history below a shallow clone's boundary

    Deepen {

        #[arg(default_value_t = 10)]

        depth: u32,

        #[arg(long, default_value = "origin")]

        remote: String,

    },

    /// Show or set the sparse filter (paths to materialize); re-checks out the bookmark

    Sparse { paths: Vec<String> },

    /// Show the working copy: changed paths and conflicts

    Status,

    /// One-line summary for shell prompts; fast and records nothing

    Prompt {

        /// Placeholders: %b bookmark, %c change id, %h heads, %d dirty (*), %x conflict (!), %A/%D ahead/behind (+n/-n), %a/%B raw counts

        #[arg(long, default_value = oxy_core::repo::DEFAULT_PROMPT_FORMAT)]

        format: String,

    },

    /// Record the working copy as a change on the current bookmark

    Commit {

        #[arg(short, long)]

        message: String,

        /// Extra explicit dependencies (ChangeId prefix, #hash prefix)

        #[arg(long = "depends-on")]

        depends_on: Vec<String>,

    },

    /// List changes reachable from the bookmark and the working copy

    Log,

    /// Show what the working copy changes against its base

    Diff,

    /// Change the message of a head (default: the head the working copy sits on)

    Describe {

        #[arg(short, long)]

        message: String,

        change: Option<String>,

    },

    /// Fold the working copy into the head it sits on

    Amend {

        #[arg(short, long)]

        message: Option<String>,

    },

    /// Drop a head from the bookmark; its content stays on disk as uncommitted work

    Abandon { change: String },

    /// Show one change (ChangeId prefix, #hash prefix, or @)

    Show { change: String },

    /// Move the working copy to the state formed by CHANGE... (default: the bookmark heads)

    Checkout {

        changes: Vec<String>,

        /// Throw away uncommitted working-copy changes

        #[arg(long)]

        discard: bool,

    },

    /// Report which conflicts of the working copy's base are resolved by the current files

    Resolve,

    /// Undo the last operation

    Undo,

    /// Write a checkpoint of the current bookmark's state now

    Checkpoint,

    /// Pack loose objects and prune unreachable ones older than the grace period

    Gc {

        /// Ignore the grace period (core.gc-grace) and prune immediately

        #[arg(long)]

        now: bool,

    },

    /// List operations

    #[command(name = "op")]

    Op {

        #[command(subcommand)]

        cmd: OpCmd,

    },

    /// Workspaces: extra checkout directories sharing this repository

    Workspace {

        #[command(subcommand)]

        cmd: WorkspaceCmd,

    },

    /// Tags: immutable named states

    Tag {

        #[command(subcommand)]

        cmd: TagCmd,

    },

    /// Manage remotes

    Remote {

        #[command(subcommand)]

        cmd: RemoteCmd,

    },

    /// Fetch every bookmark of a remote into its tracking references

    Fetch { remote: Option<String> },

    /// Fetch, then union the remote bookmark into the local one (no merge change)

    Pull { remote: Option<String> },

    /// Push the current bookmark to a remote

    Push {

        remote: Option<String>,

        /// Allow dropping heads the remote has

        #[arg(long)]

        force: bool,

    },

    /// Serve repositories under ROOT over HTTPS (with --tls-cert/--tls-key) or plain HTTP

    Serve {

        /// Directory with one repository per subdirectory

        #[arg(long, default_value = ".")]

        root: PathBuf,

        #[arg(long, default_value = "127.0.0.1:8890")]

        bind: String,

        /// Bearer token allowed to push (repeatable); none means open

        #[arg(long = "token")]

        tokens: Vec<String>,

        /// PEM certificate chain; enables HTTPS together with --tls-key

        #[arg(long, requires = "tls_key")]

        tls_cert: Option<PathBuf>,

        /// PEM private key

        #[arg(long, requires = "tls_cert")]

        tls_key: Option<PathBuf>,

    },

    /// Manage the signing identity

    Identity {

        #[command(subcommand)]

        cmd: IdentityCmd,

    },

    /// Verify the signatures on a change (default: every change in the log)

    Verify { change: Option<String> },

    /// Git interoperability

    Git {

        #[command(subcommand)]

        cmd: GitCmd,

    },

    /// Manage the trust policy (who may update which bookmarks)

    Policy {

        #[command(subcommand)]

        cmd: PolicyCmd,

    },

    /// Set a configuration key (author.*, core.sign, core.op-retention, core.gc-grace, core.checkpoint-interval, filter.max-blob, filter.paths, workspace.bookmark, remote.<name>.url|token|ca)

    Config {

        key: String,

        value: String,

        /// Write to the user file (~/.config/oxy/config.toml) instead of this repository

        #[arg(long)]

        user: bool,

    },

}

#[derive(Subcommand)]

enum OpCmd {

    Log,

}

#[derive(Subcommand)]

enum WorkspaceCmd {

    /// Create a workspace at PATH checked out on CHANGE... (default: the bookmark heads)

    Add { path: PathBuf, changes: Vec<String> },

    List,

    /// Stop tracking a workspace (by id prefix or path); its files stay

    Forget { workspace: String },

}

#[derive(Subcommand)]

enum TagCmd {

    /// Tag the state of CHANGE... (default: the bookmark heads)

    Create {

        name: String,

        changes: Vec<String>,

        #[arg(short, long, default_value = "")]

        message: String,

    },

    List,

}

#[derive(Subcommand)]

enum RemoteCmd {

    Add { name: String, url: String },

    Remove { name: String },

    List,

}

#[derive(Subcommand)]

enum IdentityCmd {

    /// Generate a composite Ed25519 + ML-DSA-65 key pair and make it your author identity

    Create {

        #[arg(long)]

        name: Option<String>,

        #[arg(long)]

        email: Option<String>,

        /// Record the author in this repository only, not in the user config

        #[arg(long)]

        local: bool,

    },

    /// Show the configured identity

    Show,

    /// Write your identity object to a file, to hand to a policy holder

    Export { path: Option<PathBuf> },

}

#[derive(Subcommand)]

enum GitCmd {

    /// Export the current bookmark to a Git repository (created bare if absent)

    Export { git_dir: PathBuf },

    /// Import a Git branch into a new Oxygen repository at DEST

    Import {

        git_dir: PathBuf,

        dest: PathBuf,

        #[arg(long, default_value = "main")]

        branch: String,

    },

}

#[derive(Subcommand)]

enum PolicyCmd {

    /// Create the initial policy with your identity as the only root

    Init,

    /// Show the current policy

    Show,

    /// Allow an identity (from `oxy identity export`) to update bookmarks

    Grant {

        identity_file: PathBuf,

        /// Reference pattern the grant applies to (default: every bookmark)

        #[arg(long)]

        pattern: Option<String>,

    },

    /// Revoke a key (KeyId prefix of an identity in the policy)

    Revoke { key: String },

}

/// Open the repository containing the current directory.

fn open() -> Result<Repo> {

    Repo::open(&std::env::current_dir()?).context("opening repository")

}

/// Parse arguments and run; returns the process exit code.

pub fn run() -> Result<i32> {

    let cli = Cli::parse();

    ui::init(cli.plain);

    match cli.cmd {

        Cmd::Init { path } => workspace::init(path),

        Cmd::Status => workspace::status(),

        Cmd::Prompt { format } => workspace::prompt(&format),

        Cmd::Commit { message, depends_on } => workspace::commit(&message, &depends_on),

        Cmd::Log => workspace::log(),

        Cmd::Diff => workspace::diff(),

        Cmd::Describe { message, change } => workspace::describe(&message, change.as_deref()),

        Cmd::Amend { message } => workspace::amend(message.as_deref()),

        Cmd::Abandon { change } => workspace::abandon(&change),

        Cmd::Show { change } => workspace::show(&change),

        Cmd::Checkout { changes, discard } => workspace::checkout(&changes, discard),

        Cmd::Resolve => workspace::resolve(),

        Cmd::Undo => workspace::undo(),

        Cmd::Gc { now } => workspace::gc(now),

        Cmd::Checkpoint => workspace::checkpoint(),

        Cmd::Op { cmd: OpCmd::Log } => workspace::op_log(),

        Cmd::Clone { url, dest, max_blob, sparse, depth } => sync::clone(&url, dest, max_blob.as_deref(), &sparse, depth),

        Cmd::Deepen { depth, remote } => sync::deepen(&remote, depth),

        Cmd::Sparse { paths } => workspace::sparse(&paths),

        Cmd::Workspace { cmd } => match cmd {

            WorkspaceCmd::Add { path, changes } => workspace::workspace_add(&path, &changes),

            WorkspaceCmd::List => workspace::workspace_list(),

            WorkspaceCmd::Forget { workspace } => workspace::workspace_forget(&workspace),

        },

        Cmd::Tag { cmd } => match cmd {

            TagCmd::Create { name, changes, message } => workspace::tag_create(&name, &changes, &message),

            TagCmd::List => workspace::tag_list(),

        },

        Cmd::Remote { cmd } => match cmd {

            RemoteCmd::Add { name, url } => sync::remote_add(&name, &url),

            RemoteCmd::Remove { name } => sync::remote_remove(&name),

            RemoteCmd::List => sync::remote_list(),

        },

        Cmd::Fetch { remote } => sync::fetch(remote.as_deref()),

        Cmd::Pull { remote } => sync::pull(remote.as_deref()),

        Cmd::Push { remote, force } => sync::push(remote.as_deref(), force),

        Cmd::Serve { root, bind, tokens, tls_cert, tls_key } => sync::serve(root, &bind, tokens, tls_cert.zip(tls_key)),

        Cmd::Identity { cmd } => match cmd {

            IdentityCmd::Create { name, email, local } => identity::create(name, email, local),

            IdentityCmd::Show => identity::show(),

            IdentityCmd::Export { path } => identity::export(path),

        },

        Cmd::Git { cmd: GitCmd::Export { git_dir } } => sync::git_export(&git_dir),

        Cmd::Git { cmd: GitCmd::Import { git_dir, dest, branch } } => sync::git_import(&git_dir, &dest, &branch),

        Cmd::Policy { cmd } => match cmd {

            PolicyCmd::Init => identity::policy_init(),

            PolicyCmd::Show => identity::policy_show(),

            PolicyCmd::Grant { identity_file, pattern } => identity::policy_grant(&identity_file, pattern.as_deref()),

            PolicyCmd::Revoke { key } => identity::policy_revoke(&key),

        },

        Cmd::Verify { change } => identity::verify(change.as_deref()),

        Cmd::Config { key, value, user } => identity::config(&key, &value, user),

    }

}