pitboard-core 0.1.3

//! pitboard's operations, each run the way every front end must run it: a change settles any
//! interrupted switch first and is recorded in the audit log, and what went wrong on the way
//! is reported alongside the result, whether or not the change then succeeds.

use crate::context::Context;
use crate::doctor::{self, Diagnosis};
use crate::error::{Error, Result};
use crate::state::{self, Account};
use crate::switch::{self, Enrolled, Outcome, Recovered, Renewal, Settled, SignIn};
use crate::{audit, status, statusline};
use std::fmt;

/// Something to know about that did not stop the operation.
#[derive(Debug)]
pub enum Warning {
    /// An earlier switch had been interrupted; this run found what it did and recorded it.
    Recovered(Recovered),
    /// The login moved, but Claude Code's config still names the previous account.
    ConfigNotUpdated(Error),
    /// Parked logins no longer in use that could not be deleted yet.
    ParksPendingRemoval(usize),
    /// Anthropic refuses a parked login for good, so it was dropped.
    ParkedLoginRefused {
        label: String,
    },
    RenewalFailed(Error),
}

impl Warning {
    /// Stable, for a program to branch on.
    pub fn code(&self) -> &'static str {
        match self {
            Warning::Recovered(r) => r.code(),
            Warning::ConfigNotUpdated(e) | Warning::RenewalFailed(e) => e.code(),
            Warning::ParksPendingRemoval(_) => "parks_pending_removal",
            Warning::ParkedLoginRefused { .. } => "parked_login_refused",
        }
    }
}

impl fmt::Display for Warning {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Warning::Recovered(r) => write!(f, "{r}"),
            Warning::ConfigNotUpdated(e) | Warning::RenewalFailed(e) => write!(f, "{e}"),
            Warning::ParksPendingRemoval(count) => write!(
                f,
                "{count} parked login(s) no longer in use could not be removed yet; pitboard \
                 tries again on its next change"
            ),
            Warning::ParkedLoginRefused { label } => write!(
                f,
                "Anthropic no longer accepts the parked login for `{label}`. Run `pitboard \
                 enroll {label} --sign-in` to sign in to it again."
            ),
        }
    }
}

#[derive(Debug)]
pub struct Done<T> {
    pub value: T,
    pub warnings: Vec<Warning>,
}

/// A change that failed, with what was found on the way: recovering an interrupted switch
/// is reported even when the change that followed it fails.
#[derive(Debug)]
pub struct Failed {
    pub error: Error,
    pub warnings: Vec<Warning>,
}

pub type Changing<T> = std::result::Result<Done<T>, Failed>;

pub struct Pitboard {
    ctx: Context,
}

impl Pitboard {
    pub fn new(ctx: Context) -> Pitboard {
        Pitboard { ctx }
    }

    /// Who is signed in and what every account has left. Parked logins whose access has
    /// lapsed are renewed first, so every account is asked live.
    pub fn status(&self) -> Result<Done<status::Report>> {
        let mut warnings = Vec::new();
        for (label, outcome) in switch::renew_parked(&self.ctx) {
            audit::record(&self.ctx, "renew", &label, outcome.code());
            match outcome {
                Renewal::Refused => warnings.push(Warning::ParkedLoginRefused { label }),
                Renewal::Failed(e) => warnings.push(Warning::RenewalFailed(e)),
                Renewal::Renewed | Renewal::Deferred => {}
            }
        }
        // Unreadable is not the same as empty: reporting it as empty would say the enrolled
        // logins are gone.
        let state = state::load(&self.ctx)?;
        Ok(Done {
            value: status::gather(&self.ctx, &state),
            warnings,
        })
    }

    pub fn doctor(&self) -> Diagnosis {
        doctor::run(&self.ctx)
    }

    /// The status line for Claude Code's session JSON. Reads only files.
    pub fn statusline(&self, session: &str) -> statusline::StatusLine {
        statusline::read(&self.ctx, session)
    }

    /// The enrolled account under `label`, if any, read without taking the lock.
    pub fn account(&self, label: &str) -> Option<Account> {
        state::load(&self.ctx).ok()?.get(label).cloned()
    }

    pub fn switch_to(&self, label: &str) -> Changing<Outcome> {
        self.changing("use", label, |settled| switch::switch(settled, label))
    }

    pub fn enroll_current(&self, label: &str) -> Changing<Enrolled> {
        self.changing("enroll", label, |settled| {
            switch::enroll(settled, label, None).map(|e| (e, Vec::new()))
        })
    }

    /// Claude Code's own sign-in in a private directory. It takes no lock but its own, so a
    /// person taking their time in a browser never holds up a switch.
    pub fn sign_in(&self, label: &str) -> Result<SignIn> {
        switch::sign_in(&self.ctx)
            .inspect_err(|e| audit::record(&self.ctx, "enroll", label, e.code()))
    }

    pub fn enroll_signed_in(&self, label: &str, login: SignIn) -> Changing<Enrolled> {
        self.changing("enroll", label, |settled| {
            switch::enroll(settled, label, Some(login)).map(|e| (e, Vec::new()))
        })
    }

    /// Returns the account's email.
    pub fn forget(&self, label: &str) -> Changing<String> {
        self.changing("forget", label, |settled| switch::forget(settled, label))
    }

    /// Returns the account's email.
    pub fn rename(&self, from: &str, to: &str) -> Changing<String> {
        self.changing("rename", &format!("{from} -> {to}"), |settled| {
            switch::rename(settled, from, to).map(|email| (email, Vec::new()))
        })
    }

    /// Settles, runs the change, and records it in the audit log.
    fn changing<T: Audited>(
        &self,
        verb: &str,
        subject: &str,
        run: impl FnOnce(Settled) -> Result<(T, Vec<Warning>)>,
    ) -> Changing<T> {
        let (settled, recovered) = switch::settle(&self.ctx).map_err(|error| {
            audit::record(&self.ctx, verb, subject, error.code());
            Failed {
                error,
                warnings: Vec::new(),
            }
        })?;
        let mut warnings = Vec::new();
        if let Some(r) = recovered {
            audit::record(&self.ctx, "recover", &r.to, r.code());
            warnings.push(Warning::Recovered(r));
        }
        match run(settled) {
            Ok((value, more)) => {
                audit::record(&self.ctx, verb, subject, value.audit_code());
                warnings.extend(more);
                Ok(Done { value, warnings })
            }
            Err(error) => {
                audit::record(&self.ctx, verb, subject, error.code());
                Err(Failed { error, warnings })
            }
        }
    }
}

/// How a successful change is written in the audit log.
trait Audited {
    fn audit_code(&self) -> &'static str {
        "ok"
    }
}

impl Audited for Outcome {
    fn audit_code(&self) -> &'static str {
        match self {
            Outcome::Switched { .. } => "ok",
            Outcome::AlreadyActive { .. } => "already_active",
        }
    }
}

impl Audited for Enrolled {}
impl Audited for String {}