//! Shared helpers of the skeleton tests: a migrated temporary database, seeded users and devices, a fixed
//! clock and a one-shot request helper.

use std::path::PathBuf;
use std::sync::Arc;

use axum::body::Body;
use axum::http::{Method, Request, StatusCode};
use http_body_util::BodyExt;
use kvitt_server::config::Config;
use kvitt_server::time::{FixedClock, parse_ts};
use kvitt_server::{AppState, auth, db, router};
use serde_json::Value;
use tower::ServiceExt;
use uuid::Uuid;

pub const ADMIN_ID: &str = "0192a000-0000-7000-8000-000000000001";
pub const MEMBER_ID: &str = "0192a000-0000-7000-8000-000000000002";
pub const ADMIN_DEVICE_ID: &str = "0192a001-0000-7000-8000-000000000001";
pub const MEMBER_DEVICE_ID: &str = "0192a001-0000-7000-8000-000000000002";
pub const REVOKED_DEVICE_ID: &str = "0192a001-0000-7000-8000-000000000003";
pub const NOW: &str = "2026-10-17T12:00:00.000Z";

pub fn token(tag: char) -> String {
    format!("kvt_{}", tag.to_string().repeat(43))
}

pub fn admin_token() -> String {
    token('A')
}
pub fn member_token() -> String {
    token('M')
}
pub fn revoked_token() -> String {
    token('R')
}

/// A data directory removed on drop.
pub struct TempDir(pub PathBuf);

impl TempDir {
    pub fn new() -> Self {
        let dir = std::env::temp_dir().join(format!("kvitt-test-{}", Uuid::now_v7()));
        std::fs::create_dir_all(&dir).unwrap();
        Self(dir)
    }
}

impl Drop for TempDir {
    fn drop(&mut self) {
        let _ = std::fs::remove_dir_all(&self.0);
    }
}

pub struct TestApp {
    /// Kept alive so the directory is removed when the app is dropped.
    pub _dir: TempDir,
    pub state: AppState,
    pub clock: FixedClock,
}

impl TestApp {
    /// A migrated, empty database (no users).
    pub async fn empty() -> Self {
        Self::migrated_to(None).await
    }

    /// An empty database at schema version 1: only `0001_init.sql` applied, through the server's own migrator, so a
    /// later `db::migrate` upgrades it the way a deployed v1 database is upgraded.
    pub async fn at_v1() -> Self {
        Self::migrated_to(Some(1)).await
    }

    async fn migrated_to(target: Option<i64>) -> Self {
        let dir = TempDir::new();
        let config = Config::from_lookup(|k| {
            (k == "KVITT_DATA_DIR").then(|| dir.0.to_string_lossy().into_owned())
        })
        .unwrap();
        let pool = db::connect(&config.database_path()).await.unwrap();
        match target {
            Some(version) => db::MIGRATOR.run_to(version, &pool).await.unwrap(),
            None => db::migrate(&pool).await.unwrap(),
        }
        let clock = FixedClock::new(parse_ts(NOW).unwrap());
        let state = AppState::new(config, pool).with_clock(Arc::new(clock.clone()));
        Self {
            _dir: dir,
            state,
            clock,
        }
    }

    /// Admin and member users, one device each, plus a revoked device of the member.
    pub async fn household() -> Self {
        let app = Self::empty().await;
        app.seed_household().await;
        app
    }

    /// Inserts the users and devices of [`TestApp::household`] (users at `server_version` 15 and 16, after the
    /// fourteen seeded categories; the sequence is not advanced).
    pub async fn seed_household(&self) {
        let pool = &self.state.db;
        for (id, role, name, version) in [
            (ADMIN_ID, "admin", "Jacob", 15),
            (MEMBER_ID, "member", "Partner", 16),
        ] {
            sqlx::query(
                "INSERT INTO users (id, role, display_name, picture_version, created_at, updated_at, server_version) \
                 VALUES (?, ?, ?, NULL, ?, ?, ?)",
            )
            .bind(id)
            .bind(role)
            .bind(name)
            .bind("2026-10-01T00:00:00.000Z")
            .bind("2026-10-01T00:00:00.000Z")
            .bind(version)
            .execute(pool)
            .await
            .unwrap();
        }
        for (id, user, tok, revoked) in [
            (ADMIN_DEVICE_ID, ADMIN_ID, admin_token(), None),
            (MEMBER_DEVICE_ID, MEMBER_ID, member_token(), None),
            (
                REVOKED_DEVICE_ID,
                MEMBER_ID,
                revoked_token(),
                Some("2026-10-10T00:00:00.000Z"),
            ),
        ] {
            sqlx::query(
                "INSERT INTO devices (id, user_id, name, token_hash, created_at, last_seen_at, revoked_at) \
                 VALUES (?, ?, 'Phone', ?, '2026-10-01T00:00:00.000Z', '2026-10-01T00:00:00.000Z', ?)",
            )
            .bind(id)
            .bind(user)
            .bind(auth::sha256_hex(&tok))
            .bind(revoked)
            .execute(pool)
            .await
            .unwrap();
        }
    }

    pub async fn send(&self, request: Request<Body>) -> Reply {
        let response = router::router(self.state.clone())
            .oneshot(request)
            .await
            .unwrap();
        let status = response.status();
        let headers = response.headers().clone();
        let bytes = response.into_body().collect().await.unwrap().to_bytes();
        let json = serde_json::from_slice(&bytes).unwrap_or(Value::Null);
        Reply {
            status,
            headers,
            json,
        }
    }
}

pub struct Reply {
    pub status: StatusCode,
    pub headers: axum::http::HeaderMap,
    pub json: Value,
}

impl Reply {
    pub fn code(&self) -> &str {
        self.json["code"].as_str().unwrap_or("")
    }
}

/// A request builder with the app's usual headers.
pub fn request(
    method: Method,
    path: &str,
    token: Option<&str>,
    protocol: Option<&str>,
) -> Request<Body> {
    let mut builder = Request::builder().method(method).uri(path);
    if let Some(token) = token {
        builder = builder.header("authorization", format!("Bearer {token}"));
    }
    if let Some(protocol) = protocol {
        builder = builder.header("x-kvitt-protocol", protocol);
    }
    builder.body(Body::empty()).unwrap()
}

pub fn authed(method: Method, path: &str, token: &str) -> Request<Body> {
    request(method, path, Some(token), Some("1"))
}