//! Install a reviewed local package onto the bound Computer and bind it to a bot.
use axum::extract::{Path, State};
use axum::http::StatusCode;
use axum::routing::{get, post};
use axum::{Json, Router};
use lazyboy_contracts::ComputerMode;
use lazyboy_control::{
    AdapterContext, CommandRequest, ComputerRef, ReadyBinding, ReadyBindingChange, RollbackChange,
    SandboxProvider, ToolManifest, artifact_digest, package_gc_allowed, pin_running_jobs,
    plan_version_switch, previous_version, rollback_one_ready_binding, upsert_one_ready_binding,
    validate_manifest,
};
use serde::Deserialize;
use serde_json::{Value, json};
use sqlx::PgPool;
use uuid::Uuid;

use crate::computer::{self, adapter_context};
use crate::db::{Actor, parse_mode};
use crate::state::AppState;

const ECHO_SOURCE: &str = include_str!("../../../scripts/sample-mcp/echo_server.py");
pub const ECHO_ID: &str = "lazyboy.example.echo";
pub const ECHO_VERSION: &str = "0.0.1";
pub const ECHO_VERSION_NEXT: &str = "0.0.2";

type ApiError = (StatusCode, Json<Value>);

pub fn router() -> Router<AppState> {
    Router::new()
        .route("/api/bots/{id}/tools", get(list_tools).post(install_sample))
        .route("/api/bots/{id}/tools/call", post(call_installed))
        .route(
            "/api/bots/{id}/tools/{binding_id}/switch",
            post(crate::package_transitions::switch),
        )
        .route(
            "/api/bots/{id}/tools/{binding_id}/call",
            post(crate::installed_mcp::invoke),
        )
        .route(
            "/api/bots/{id}/tools/{binding_id}/discover",
            post(crate::installed_mcp::discover),
        )
        .route(
            "/api/bots/{id}/tools/install",
            post(crate::installed_mcp::install),
        )
        .route(
            "/api/bots/{id}/tools/{binding_id}/revoke",
            post(revoke_binding),
        )
        .route(
            "/api/bots/{id}/tools/{binding_id}/rollback",
            post(rollback_binding),
        )
        .route(
            "/api/bots/{id}/tools/{binding_id}/remove",
            post(remove_binding),
        )
}

#[derive(Deserialize)]
struct InstallBody {
    #[serde(default, rename = "packageId", alias = "package_id")]
    pub package_id: Option<String>,
    #[serde(default)]
    pub version: Option<String>,
}

/// Immutable packages live on the Computer, not in the bot workspace folder.
pub fn echo_relative_path(mode: ComputerMode, version: &str) -> String {
    match mode {
        ComputerMode::Team => format!("shared/tools/{ECHO_ID}/{version}/echo_server.py"),
        ComputerMode::Dedicated => format!("tools/{ECHO_ID}/{version}/echo_server.py"),
    }
}

fn echo_version(requested: Option<&str>) -> Result<&str, ApiError> {
    match requested.unwrap_or(ECHO_VERSION) {
        ECHO_VERSION => Ok(ECHO_VERSION),
        ECHO_VERSION_NEXT => Ok(ECHO_VERSION_NEXT),
        other => Err((
            StatusCode::BAD_REQUEST,
            Json(json!({"message": format!("unsupported echo version {other}")})),
        )),
    }
}

pub fn tool_install_enabled() -> bool {
    std::env::var("LAZYBOY_TOOL_INSTALL_ENABLED")
        .map(|value| value != "false" && value != "0")
        .unwrap_or(true)
}

async fn list_tools(
    State(state): State<AppState>,
    actor: Actor,
    Path(bot_id): Path<String>,
) -> Result<Json<Value>, ApiError> {
    binding_list(state.pool(), &actor, &bot_id).await.map(Json)
}

#[derive(sqlx::FromRow)]
struct ListedBinding {
    id: String,
    package_id: String,
    version: String,
    sha256: String,
    install_status: String,
    binding_status: String,
    archive: bool,
    transition: Option<Value>,
}

async fn binding_list(pool: &sqlx::PgPool, actor: &Actor, bot_id: &str) -> Result<Value, ApiError> {
    let rows: Vec<ListedBinding> = sqlx::query_as(
        "SELECT b.id, p.package_id, p.version, p.sha256, p.status AS install_status, b.status AS binding_status, p.manifest IS NOT NULL AS archive, (SELECT jsonb_build_object('operationId',t.id,'version',target.version,'status',t.status) FROM package_transitions t JOIN tool_packages target ON target.id=t.target_id WHERE t.binding_id=b.id AND t.status IN ('pending','cancelling')) AS transition
         FROM tool_bindings b
         JOIN tool_packages p ON p.id=b.package_row_id
         JOIN bots bot ON bot.id=b.bot_id
         WHERE b.bot_id=$1 AND bot.space_id=$2 AND bot.user_id=$3 AND p.computer_id=bot.computer_id
         ORDER BY b.created_at",
    )
    .bind(bot_id)
    .bind(&actor.space_id)
    .bind(&actor.user_id)
    .fetch_all(pool)
    .await
    .map_err(internal)?;
    Ok(json!({
        "tools": rows.into_iter().map(|row| json!({
            "bindingId": row.id,
            "archivePackage": row.archive,
            "transition": row.transition,
            "packageId": row.package_id,
            "version": row.version,
            "sha256": row.sha256,
            "installStatus": row.install_status,
            "bindingStatus": row.binding_status,
            "ready": row.install_status == "installed" && row.binding_status == "ready",
            "executionLocation": "assigned_computer",
        })).collect::<Vec<_>>()
    }))
}

async fn install_sample(
    State(state): State<AppState>,
    actor: Actor,
    Path(bot_id): Path<String>,
    Json(body): Json<InstallBody>,
) -> Result<Json<Value>, ApiError> {
    if !tool_install_enabled() {
        return Err((
            StatusCode::FORBIDDEN,
            Json(json!({"message":"tool install is disabled"})),
        ));
    }
    let package_id = body.package_id.unwrap_or_else(|| ECHO_ID.into());
    if package_id != ECHO_ID {
        return Err((
            StatusCode::BAD_REQUEST,
            Json(
                json!({"message":"only lazyboy.example.echo is installable without a reviewed artifact"}),
            ),
        ));
    }
    let version = echo_version(body.version.as_deref())?.to_string();
    let digest = artifact_digest(ECHO_SOURCE.as_bytes());
    let manifest = ToolManifest {
        id: ECHO_ID.into(),
        version: version.clone(),
        sha256: digest.clone(),
        entrypoint: vec!["python3".into(), "./echo_server.py".into()],
        share_immutable_package: true,
    };
    validate_manifest(&manifest).map_err(|error| {
        (
            StatusCode::BAD_REQUEST,
            Json(json!({"message": format!("{error:?}")})),
        )
    })?;
    let _bot = state
        .db
        .get_bot(&actor, &bot_id)
        .await
        .map_err(internal)?
        .ok_or((
            StatusCode::NOT_FOUND,
            Json(json!({"message":"bot not found"})),
        ))?;
    computer::boot_for(&state, &actor, &bot_id, false)
        .await
        .map_err(|error| (StatusCode::BAD_GATEWAY, Json(json!({"message": error}))))?;
    // Provisioning may have assigned a Computer; do not use the pre-boot row.
    let bot = state
        .db
        .get_bot(&actor, &bot_id)
        .await
        .map_err(internal)?
        .ok_or((
            StatusCode::NOT_FOUND,
            Json(json!({"message":"bot not found"})),
        ))?;
    let computer = state
        .db
        .get_computer(bot.computer_id.as_deref().unwrap_or(""))
        .await
        .map_err(internal)?
        .ok_or((
            StatusCode::NOT_FOUND,
            Json(json!({"message":"computer not found"})),
        ))?;
    let computer_ref = computer::computer_ref(&computer).ok_or((
        StatusCode::CONFLICT,
        Json(json!({"message":"computer is not running"})),
    ))?;
    let mode = parse_mode(&computer.scope);
    let relative = echo_relative_path(mode, &version);
    state
        .sandbox
        .write_file(
            &computer_ref,
            &relative,
            ECHO_SOURCE.as_bytes(),
            &adapter_context(&actor, &bot_id, "tool-install"),
        )
        .await
        .map_err(|error| {
            (
                StatusCode::BAD_GATEWAY,
                Json(json!({"message": error.to_string()})),
            )
        })?;
    let package_row = Uuid::new_v4().to_string();
    sqlx::query(
        "INSERT INTO tool_packages (id, computer_id, package_id, version, sha256, status)
         VALUES ($1,$2,$3,$4,$5,'installed')
         ON CONFLICT (computer_id, package_id, version) DO UPDATE SET status='installed', sha256=EXCLUDED.sha256",
    )
    .bind(&package_row)
    .bind(&computer.id)
    .bind(ECHO_ID)
    .bind(&version)
    .bind(&digest)
    .execute(state.pool())
    .await
    .map_err(internal)?;
    let row_id: String = sqlx::query_scalar(
        "SELECT id FROM tool_packages WHERE computer_id=$1 AND package_id=$2 AND version=$3",
    )
    .bind(&computer.id)
    .bind(ECHO_ID)
    .bind(&version)
    .fetch_one(state.pool())
    .await
    .map_err(internal)?;
    let existing: Option<(String, String, String)> = sqlx::query_as(
        "SELECT b.id, b.package_row_id, p.version FROM tool_bindings b
         JOIN tool_packages p ON p.id=b.package_row_id
         WHERE b.bot_id=$1 AND p.package_id=$2 AND b.status='ready'
         ORDER BY b.created_at DESC LIMIT 1",
    )
    .bind(&bot_id)
    .bind(ECHO_ID)
    .fetch_optional(state.pool())
    .await
    .map_err(internal)?;
    let jobs: i64 = sqlx::query_scalar(
        "SELECT COUNT(*) FROM computer_jobs WHERE computer_id=$1 AND status IN ('running','accepted','paused','cancelling','unknown')",
    )
    .bind(&computer.id)
    .fetch_one(state.pool())
    .await
    .unwrap_or(0);
    let current_version = existing
        .as_ref()
        .map(|row| row.2.as_str())
        .unwrap_or(&version);
    let plan = plan_version_switch(current_version, &version, jobs.max(0) as usize);
    // Only this bot's jobs were started with the version being replaced; other
    // bots sharing the Computer keep their own bindings.
    if let Some(pin) = pin_running_jobs(current_version, &version, jobs.max(0) as usize) {
        let _ = sqlx::query(
            "UPDATE computer_jobs SET pin_version=$2
             WHERE computer_id=$1 AND bot_id=$3 AND status IN ('running','accepted','paused','cancelling','unknown') AND pin_version IS NULL",
        )
        .bind(&computer.id)
        .bind(&pin)
        .bind(&bot_id)
        .execute(state.pool())
        .await;
    }
    let ready = existing
        .as_ref()
        .map(|(id, package_row_id, ver)| ReadyBinding {
            id: id.clone(),
            package_row_id: package_row_id.clone(),
            version: ver.clone(),
        });
    let change = upsert_one_ready_binding(
        ready.as_ref(),
        &row_id,
        &version,
        &Uuid::new_v4().to_string(),
    );
    let binding_id = match &change {
        ReadyBindingChange::Insert {
            id, package_row_id, ..
        } => {
            // Retired identifiers stay retired; a new sample authorization
            // gets a fresh binding instead of reviving an old identifier.
            let binding_id: String = sqlx::query_scalar(
                "INSERT INTO tool_bindings (id, package_row_id, bot_id, status)
                 VALUES ($1,$2,$3,'ready')
                 ON CONFLICT (package_row_id, bot_id) WHERE status IN ('installing','ready','switching','retiring') DO UPDATE SET status='ready'
                 RETURNING id",
            )
            .bind(id)
            .bind(package_row_id)
            .bind(&bot_id)
            .fetch_one(state.pool())
            .await
            .map_err(internal)?;
            binding_id
        }
        ReadyBindingChange::Switch {
            id, package_row_id, ..
        } => {
            switch_binding(state.pool(), id, package_row_id, &bot_id)
                .await
                .map_err(internal)?;
            id.clone()
        }
        ReadyBindingChange::Keep { id } => id.clone(),
    };
    Ok(Json(json!({
        "packageId": ECHO_ID,
        "version": version,
        "bindingId": binding_id,
        "sha256": digest,
        "path": relative,
        "installStatus": "installed",
        "bindingStatus": "ready",
        "jobPin": plan.job_pin,
        "newRuns": plan.new_runs,
        "executionLocation": "assigned_computer",
    })))
}

/// Point a ready binding at another package row. A revoked leftover for the
/// same (package_row, bot) would trip the unique index, so it is dropped first.
async fn switch_binding(
    pool: &PgPool,
    binding_id: &str,
    package_row_id: &str,
    bot_id: &str,
) -> Result<(), sqlx::Error> {
    let mut tx = pool.begin().await?;
    sqlx::query(
        "DELETE FROM tool_bindings
         WHERE package_row_id=$1 AND bot_id=$2 AND status<>'ready' AND id<>$3",
    )
    .bind(package_row_id)
    .bind(bot_id)
    .bind(binding_id)
    .execute(&mut *tx)
    .await?;
    sqlx::query("UPDATE tool_bindings SET package_row_id=$2, status='ready' WHERE id=$1")
        .bind(binding_id)
        .bind(package_row_id)
        .execute(&mut *tx)
        .await?;
    tx.commit().await
}

#[derive(Deserialize)]
struct CallBody {
    pub text: String,
    #[serde(default, rename = "packageId")]
    pub package_id: Option<String>,
}

async fn call_installed(
    State(state): State<AppState>,
    actor: Actor,
    Path(bot_id): Path<String>,
    Json(body): Json<CallBody>,
) -> Result<Json<Value>, ApiError> {
    let package_id = body.package_id.as_deref().unwrap_or(ECHO_ID);
    if package_id != ECHO_ID {
        return Err((
            StatusCode::BAD_REQUEST,
            Json(json!({"message":"only lazyboy.example.echo can be called via this fixture"})),
        ));
    }
    if !package_is_bound(state.pool(), &actor, &bot_id, package_id)
        .await
        .map_err(internal)?
    {
        return Err((
            StatusCode::FORBIDDEN,
            Json(json!({"message":"package not bound to this agent"})),
        ));
    }
    let bot = state
        .db
        .get_bot(&actor, &bot_id)
        .await
        .map_err(internal)?
        .ok_or((
            StatusCode::NOT_FOUND,
            Json(json!({"message":"bot not found"})),
        ))?;
    let computer = state
        .db
        .get_computer(bot.computer_id.as_deref().unwrap_or(""))
        .await
        .map_err(internal)?
        .ok_or((
            StatusCode::NOT_FOUND,
            Json(json!({"message":"computer not found"})),
        ))?;
    let computer_ref = computer::computer_ref(&computer).ok_or((
        StatusCode::CONFLICT,
        Json(json!({"message":"computer is not running"})),
    ))?;
    let bound = bound_echo_relative(state.pool(), &actor, &bot_id, parse_mode(&computer.scope))
        .await
        .map_err(internal)?
        .ok_or((
            StatusCode::FORBIDDEN,
            Json(json!({"message":"package not bound to this agent"})),
        ))?;
    let result = exec_echo(
        state.sandbox.as_ref(),
        &computer_ref,
        &adapter_context(&actor, &bot_id, "computer-mcp"),
        &bound,
        &body.text,
    )
    .await
    .map_err(|error| (StatusCode::BAD_GATEWAY, Json(json!({"message": error}))))?;
    Ok(Json(json!({
        "exitCode": result.code,
        "stdout": result.stdout,
        "stderr": result.stderr,
        "executionLocation": "assigned_computer",
    })))
}

/// The bound package as it must exist on the Computer: where it lives and the
/// digest the installer recorded for it.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct BoundPackage {
    pub relative: String,
    pub sha256: String,
}

pub async fn bound_echo_relative(
    pool: &PgPool,
    actor: &Actor,
    bot_id: &str,
    mode: ComputerMode,
) -> Result<Option<BoundPackage>, sqlx::Error> {
    let row: Option<(String, String)> = sqlx::query_as(
        "SELECT p.version, p.sha256 FROM tool_bindings b
         JOIN tool_packages p ON p.id=b.package_row_id
         JOIN bots bot ON bot.id=b.bot_id
         WHERE b.bot_id=$1 AND bot.space_id=$2 AND bot.user_id=$3
           AND p.package_id=$4 AND p.computer_id=bot.computer_id AND b.status='ready' AND p.status='installed'
         ORDER BY b.created_at DESC LIMIT 1",
    )
    .bind(bot_id)
    .bind(&actor.space_id)
    .bind(&actor.user_id)
    .bind(ECHO_ID)
    .fetch_optional(pool)
    .await?;
    Ok(row.map(|(version, sha256)| BoundPackage {
        relative: echo_relative_path(mode, &version),
        sha256,
    }))
}

/// Run the package only if the file on the Computer still hashes to what was
/// installed. Execute the exact bytes that were hashed, not a second open of
/// the pathname; a single shell command alone does not prevent a file swap.
pub fn verified_run_argv(absolute_path: &str, sha256: &str) -> Vec<String> {
    vec![
        "python3".into(),
        "-I".into(),
        "-c".into(),
        r#"import hashlib, os, stat, sys
digest, path = sys.argv[1:3]
fd = os.open(path, os.O_RDONLY | os.O_NOFOLLOW | os.O_NONBLOCK)
with os.fdopen(fd, 'rb') as source:
    if not stat.S_ISREG(os.fstat(source.fileno()).st_mode):
        sys.exit(97)
    code = source.read(1048577)
if len(code) > 1048576 or hashlib.sha256(code).hexdigest() != digest:
    print('package digest mismatch', file=sys.stderr)
    sys.exit(97)
sys.argv = [path]
exec(compile(code, path, 'exec'), {'__name__': '__main__', '__file__': path})"#
            .into(),
        sha256.into(),
        absolute_path.into(),
    ]
}

pub async fn package_is_bound(
    pool: &PgPool,
    actor: &Actor,
    bot_id: &str,
    package_id: &str,
) -> Result<bool, sqlx::Error> {
    let bound: Option<(String,)> = sqlx::query_as(
        "SELECT p.id FROM tool_bindings b
         JOIN tool_packages p ON p.id=b.package_row_id
         JOIN bots bot ON bot.id=b.bot_id
         WHERE b.bot_id=$1 AND bot.space_id=$2 AND bot.user_id=$3
           AND p.package_id=$4 AND p.computer_id=bot.computer_id AND b.status='ready' AND p.status='installed'
         LIMIT 1",
    )
    .bind(bot_id)
    .bind(&actor.space_id)
    .bind(&actor.user_id)
    .bind(package_id)
    .fetch_optional(pool)
    .await?;
    Ok(bound.is_some())
}

pub async fn exec_echo(
    sandbox: &dyn SandboxProvider,
    computer_ref: &ComputerRef,
    adapter: &AdapterContext,
    bound: &BoundPackage,
    text: &str,
) -> Result<lazyboy_control::CommandResult, String> {
    let rpc = json!({
        "jsonrpc": "2.0",
        "id": 1,
        "method": "tools/call",
        "params": {"arguments": {"text": text}},
    });
    sandbox
        .execute(
            computer_ref,
            CommandRequest {
                argv: verified_run_argv(
                    &format!("/home/lazyboy/{}", bound.relative),
                    &bound.sha256,
                ),
                cwd: None,
                timeout_ms: Some(10_000),
                stdin: Some(format!("{rpc}\n")),
                ..CommandRequest::default()
            },
            adapter,
        )
        .await
        .map_err(|error| error.to_string())
}

async fn revoke_binding(
    State(state): State<AppState>,
    actor: Actor,
    Path((bot_id, binding_id)): Path<(String, String)>,
) -> Result<Json<Value>, ApiError> {
    let done = sqlx::query(
        "UPDATE tool_bindings b SET status='revoked'
         FROM bots bot
         WHERE b.id=$1 AND b.bot_id=$2 AND bot.id=b.bot_id
           AND bot.space_id=$3 AND bot.user_id=$4",
    )
    .bind(&binding_id)
    .bind(&bot_id)
    .bind(&actor.space_id)
    .bind(&actor.user_id)
    .execute(state.pool())
    .await
    .map_err(internal)?;
    if done.rows_affected() == 0 {
        return Err((
            StatusCode::NOT_FOUND,
            Json(json!({"message":"binding not found"})),
        ));
    }
    crate::package_transitions::cancel_for_binding(&state, &actor, &bot_id, &binding_id)
        .await
        .map_err(|error| (StatusCode::CONFLICT, Json(json!({"message":error}))))?;
    crate::installed_mcp::revoke_runtime(&state, &actor, &bot_id, &binding_id)
        .await
        .map_err(|error| (StatusCode::CONFLICT, Json(json!({"message":error}))))?;
    Ok(Json(json!({"ok": true})))
}

async fn rollback_binding(
    State(state): State<AppState>,
    actor: Actor,
    Path((bot_id, binding_id)): Path<(String, String)>,
) -> Result<Json<Value>, ApiError> {
    let row: Option<(String, String, String, String, bool)> = sqlx::query_as(
        "SELECT p.computer_id, p.package_id, p.version, b.status, p.manifest IS NOT NULL
         FROM tool_bindings b
         JOIN tool_packages p ON p.id=b.package_row_id
         JOIN bots bot ON bot.id=b.bot_id
         WHERE b.id=$1 AND b.bot_id=$2 AND bot.space_id=$3 AND bot.user_id=$4",
    )
    .bind(&binding_id)
    .bind(&bot_id)
    .bind(&actor.space_id)
    .bind(&actor.user_id)
    .fetch_optional(state.pool())
    .await
    .map_err(internal)?;
    let Some((computer_id, package_id, current, binding_status, archive)) = row else {
        return Err((
            StatusCode::NOT_FOUND,
            Json(json!({"message":"binding not found"})),
        ));
    };
    if archive {
        return Err((
            StatusCode::CONFLICT,
            Json(
                json!({"message":"archive rollback requires a matching runtime binding; this endpoint supports sample packages only"}),
            ),
        ));
    }
    // Rolling back a revoked binding would silently re-enable the package.
    if binding_status != "ready" {
        return Err((
            StatusCode::CONFLICT,
            Json(json!({"message": format!("binding is {binding_status}; install again instead")})),
        ));
    }
    let versions: Vec<String> = sqlx::query_scalar(
        "SELECT version FROM tool_packages
         WHERE computer_id=$1 AND package_id=$2 AND status='installed'
         ORDER BY created_at",
    )
    .bind(&computer_id)
    .bind(&package_id)
    .fetch_all(state.pool())
    .await
    .map_err(internal)?;
    let refs: Vec<&str> = versions.iter().map(String::as_str).collect();
    let Some(prev) = previous_version(&refs, &current) else {
        return Err((
            StatusCode::CONFLICT,
            Json(json!({"message":"no previous version to rollback"})),
        ));
    };
    let prev_row: String = sqlx::query_scalar(
        "SELECT id FROM tool_packages WHERE computer_id=$1 AND package_id=$2 AND version=$3",
    )
    .bind(&computer_id)
    .bind(&package_id)
    .bind(prev)
    .fetch_one(state.pool())
    .await
    .map_err(internal)?;
    let leftover: Option<(String,)> = sqlx::query_as(
        "SELECT id FROM tool_bindings
         WHERE package_row_id=$1 AND bot_id=$2 AND status='ready' AND id<>$3",
    )
    .bind(&prev_row)
    .bind(&bot_id)
    .bind(&binding_id)
    .fetch_optional(state.pool())
    .await
    .map_err(internal)?;
    let current_binding = ReadyBinding {
        id: binding_id.clone(),
        package_row_id: String::new(),
        version: current.clone(),
    };
    match rollback_one_ready_binding(
        &current_binding,
        leftover.is_some(),
        Some(&prev_row),
        Some(prev),
    ) {
        RollbackChange::NoPrevious => {
            return Err((
                StatusCode::CONFLICT,
                Json(json!({"message":"no previous version to rollback"})),
            ));
        }
        RollbackChange::Conflict => {
            sqlx::query(
                "UPDATE tool_bindings SET status='revoked'
                 WHERE package_row_id=$1 AND bot_id=$2 AND status='ready' AND id<>$3",
            )
            .bind(&prev_row)
            .bind(&bot_id)
            .bind(&binding_id)
            .execute(state.pool())
            .await
            .map_err(internal)?;
            switch_binding(state.pool(), &binding_id, &prev_row, &bot_id)
                .await
                .map_err(internal)?;
        }
        RollbackChange::Switch {
            id, package_row_id, ..
        } => {
            switch_binding(state.pool(), &id, &package_row_id, &bot_id)
                .await
                .map_err(internal)?;
        }
    }
    Ok(Json(json!({
        "ok": true,
        "version": prev,
        "previous": current,
        "executionLocation": "assigned_computer",
    })))
}

async fn remove_binding(
    State(state): State<AppState>,
    actor: Actor,
    Path((bot_id, binding_id)): Path<(String, String)>,
) -> Result<Json<Value>, ApiError> {
    let row: Option<(String, String)> = sqlx::query_as(
        "SELECT p.id, p.computer_id
         FROM tool_bindings b
         JOIN tool_packages p ON p.id=b.package_row_id
         JOIN bots bot ON bot.id=b.bot_id
         WHERE b.id=$1 AND b.bot_id=$2 AND bot.space_id=$3 AND bot.user_id=$4",
    )
    .bind(&binding_id)
    .bind(&bot_id)
    .bind(&actor.space_id)
    .bind(&actor.user_id)
    .fetch_optional(state.pool())
    .await
    .map_err(internal)?;
    let Some((package_row, computer_id)) = row else {
        return Err((
            StatusCode::NOT_FOUND,
            Json(json!({"message":"binding not found"})),
        ));
    };
    sqlx::query(
        "UPDATE tool_bindings b SET status='revoked'
         FROM bots bot
         WHERE b.id=$1 AND b.bot_id=$2 AND bot.id=b.bot_id
           AND bot.space_id=$3 AND bot.user_id=$4",
    )
    .bind(&binding_id)
    .bind(&bot_id)
    .bind(&actor.space_id)
    .bind(&actor.user_id)
    .execute(state.pool())
    .await
    .map_err(internal)?;
    crate::package_transitions::cancel_for_binding(&state, &actor, &bot_id, &binding_id)
        .await
        .map_err(|error| (StatusCode::CONFLICT, Json(json!({"message":error}))))?;
    crate::installed_mcp::revoke_runtime(&state, &actor, &bot_id, &binding_id)
        .await
        .map_err(|error| (StatusCode::CONFLICT, Json(json!({"message":error}))))?;
    let ready: i64 = sqlx::query_scalar(
        "SELECT COUNT(*) FROM tool_bindings WHERE package_row_id=$1 AND status IN ('ready','installing','switching','retiring')",
    )
    .bind(&package_row)
    .fetch_one(state.pool())
    .await
    .unwrap_or(0);
    let jobs: i64 = sqlx::query_scalar(
        "SELECT COUNT(*) FROM computer_jobs WHERE computer_id=$1 AND status IN ('running','accepted','paused','cancelling','unknown')",
    )
    .bind(&computer_id)
    .fetch_one(state.pool())
    .await
    .unwrap_or(0);
    let removed = package_gc_allowed(ready.max(0) as usize, jobs.max(0) as usize);
    if removed {
        sqlx::query("UPDATE tool_packages SET status='removed' WHERE id=$1")
            .bind(&package_row)
            .execute(state.pool())
            .await
            .map_err(internal)?;
    }
    Ok(Json(json!({
        "ok": true,
        "packageRemoved": removed,
        "executionLocation": "assigned_computer",
    })))
}

fn internal<E: std::fmt::Display>(error: E) -> ApiError {
    tracing::error!("tool install: {error}");
    (
        StatusCode::INTERNAL_SERVER_ERROR,
        Json(json!({"message":"internal error"})),
    )
}

#[cfg(test)]
mod tests {
    use super::*;

    #[sqlx::test(migrations = "../../migrations")]
    async fn package_list_reports_runtime_kind_and_excludes_old_computers(pool: sqlx::PgPool) {
        for sql in [
            "INSERT INTO users(id,name) VALUES ('u','owner'),('v','other')",
            "INSERT INTO spaces(id,user_id,name) VALUES ('s','u','test')",
            "INSERT INTO computers(id,space_id,user_id,scope,scope_key,home_key) VALUES ('c','s','u','team','team:s','home'),('d','s','u','dedicated','bot:d','private')",
            "INSERT INTO bots(id,space_id,user_id,name,computer_id) VALUES ('a','s','u','A','c'),('b','s','u','B','c')",
            "INSERT INTO tool_packages(id,computer_id,package_id,version,sha256,status,manifest) VALUES ('p','c','fixture','1.0.0','digest','installed','{}'),('sample','c','echo','0.0.1','digest','installed',NULL)",
            "INSERT INTO tool_bindings(id,package_row_id,bot_id,status) VALUES ('binding','p','a','ready'),('echo','sample','a','revoked')",
        ] {
            sqlx::query(sql).execute(&pool).await.unwrap();
        }
        let owner = Actor {
            user_id: "u".into(),
            space_id: "s".into(),
        };
        let other = Actor {
            user_id: "v".into(),
            space_id: "s".into(),
        };
        let result = binding_list(&pool, &owner, "a").await.unwrap();
        let tools = result["tools"].as_array().unwrap();
        assert_eq!(tools.len(), 2);
        let archive = tools.iter().find(|t| t["bindingId"] == "binding").unwrap();
        assert_eq!(archive["archivePackage"], true);
        assert_eq!(archive["ready"], true);
        let sample = tools.iter().find(|t| t["bindingId"] == "echo").unwrap();
        assert_eq!(sample["archivePackage"], false);
        assert_eq!(sample["ready"], false);
        assert_eq!(
            binding_list(&pool, &other, "a").await.unwrap()["tools"],
            json!([])
        );
        assert_eq!(
            binding_list(&pool, &owner, "b").await.unwrap()["tools"],
            json!([])
        );
        sqlx::query("UPDATE bots SET computer_id='d' WHERE id='a'")
            .execute(&pool)
            .await
            .unwrap();
        assert_eq!(
            binding_list(&pool, &owner, "a").await.unwrap()["tools"],
            json!([])
        );
    }

    #[test]
    fn team_packages_live_on_the_shared_tree() {
        assert_eq!(
            echo_relative_path(ComputerMode::Team, ECHO_VERSION),
            "shared/tools/lazyboy.example.echo/0.0.1/echo_server.py"
        );
        assert_eq!(
            echo_relative_path(ComputerMode::Dedicated, ECHO_VERSION_NEXT),
            "tools/lazyboy.example.echo/0.0.2/echo_server.py"
        );
    }

    /// A package whose bytes no longer match the installed digest must not run.
    #[test]
    fn tampered_package_is_refused_before_it_runs() {
        let dir = std::env::temp_dir().join(format!("lazyboy-verify-{}", Uuid::new_v4()));
        std::fs::create_dir_all(&dir).unwrap();
        let path = dir.join("echo_server.py");
        std::fs::write(&path, "print('ok')\n").unwrap();
        let path = path.to_string_lossy().into_owned();
        let good = artifact_digest(b"print('ok')\n");

        let run = |digest: &str| {
            let argv = verified_run_argv(&path, digest);
            std::process::Command::new(&argv[0])
                .args(&argv[1..])
                .output()
                .unwrap()
        };
        let ok = run(&good);
        assert_eq!(ok.status.code(), Some(0), "{ok:?}");
        assert_eq!(String::from_utf8_lossy(&ok.stdout).trim(), "ok");

        let bad = run(&artifact_digest(b"something else"));
        assert_eq!(bad.status.code(), Some(97), "{bad:?}");
        assert!(bad.stdout.is_empty(), "tampered package must not execute");
        assert!(String::from_utf8_lossy(&bad.stderr).contains("digest mismatch"));
        let _ = std::fs::remove_dir_all(&dir);
    }

    #[test]
    fn agent_computer_migration_does_not_unique_bot_computer_id() {
        let sql = include_str!("../../../migrations/022_agent_computer.sql");
        assert!(sql.contains("do NOT add UNIQUE(bots.computer_id)"));
        let statements: String = sql
            .lines()
            .filter(|line| !line.trim_start().starts_with("--"))
            .collect::<Vec<_>>()
            .join("\n")
            .to_ascii_lowercase();
        assert!(!statements.contains("unique (bots.computer_id)"));
        assert!(!statements.contains("unique(bots.computer_id)"));
    }
}