//! Shared fixtures for the DB-backed integration tests.
//!
//! Every helper here executes SQL that is **character-for-character identical** to what `src/`
//! actually runs (see the `// SRC:` markers). That is the whole point: a paraphrased query is a
//! query nobody runs, and a test that passes against a paraphrase proves nothing about production.

#![allow(dead_code)] // each integration-test crate uses a different subset of these helpers

use sqlx::PgPool;
use uuid::Uuid;

/// Insert a bare, unreleased event (epoch 0, uploads open).
pub async fn seed_event(pool: &PgPool, slug: &str) -> Uuid {
    sqlx::query_scalar("INSERT INTO event (slug, name) VALUES ($1, $2) RETURNING id")
        .bind(slug)
        .bind("Hochzeit")
        .fetch_one(pool)
        .await
        .expect("seed event")
}

/// Insert a guest with a zeroed byte total.
pub async fn seed_user(pool: &PgPool, event_id: Uuid, name: &str) -> Uuid {
    sqlx::query_scalar(
        "INSERT INTO \"user\" (event_id, display_name, recovery_pin_hash)
         VALUES ($1, $2, 'x') RETURNING id",
    )
    .bind(event_id)
    .bind(name)
    .fetch_one(pool)
    .await
    .expect("seed user")
}

/// SRC: `handlers/host.rs::release_gallery` — the claim + epoch bump, verbatim.
/// Returns the POST-increment epoch, exactly as the handler consumes it.
pub async fn release_gallery(pool: &PgPool, slug: &str) -> Option<i64> {
    let claimed: Option<(Uuid, String, i64)> = sqlx::query_as(
        "UPDATE event
         SET export_released_at = NOW(),
             uploads_locked_at  = COALESCE(uploads_locked_at, NOW()),
             export_epoch       = export_epoch + 1
         WHERE slug = $1 AND export_released_at IS NULL
         RETURNING id, name, export_epoch",
    )
    .bind(slug)
    .fetch_optional(pool)
    .await
    .expect("release_gallery");

    if let Some((event_id, _, epoch)) = claimed {
        // The handler arms both jobs in the SAME transaction; for a single-connection fixture the
        // sequencing is equivalent.
        let mut conn = pool.acquire().await.expect("acquire");
        enqueue_types_at_epoch(&mut conn, event_id, epoch, &["zip", "html"]).await;
        Some(epoch)
    } else {
        None
    }
}

/// SRC: `handlers/host.rs::open_event` — the one statement that retires an entire generation.
/// Returns rows affected.
pub async fn open_event(pool: &PgPool, slug: &str) -> u64 {
    sqlx::query(
        "UPDATE event
         SET uploads_locked_at  = NULL,
             export_released_at = NULL,
             export_epoch       = export_epoch + 1
         WHERE slug = $1 AND (uploads_locked_at IS NOT NULL OR export_released_at IS NOT NULL)",
    )
    .bind(slug)
    .execute(pool)
    .await
    .expect("open_event")
    .rows_affected()
}

/// SRC: `services/export.rs::enqueue_types_at_epoch` — verbatim upsert.
pub async fn enqueue_types_at_epoch(
    conn: &mut sqlx::PgConnection,
    event_id: Uuid,
    epoch: i64,
    types: &[&str],
) {
    for export_type in types {
        sqlx::query(
            "INSERT INTO export_job (event_id, type, status, progress_pct, epoch)
             VALUES ($1, $2::export_type, 'pending', 0, $3)
             ON CONFLICT (event_id, type) DO UPDATE
                 SET status = 'pending', progress_pct = 0, file_path = NULL,
                     error_message = NULL, completed_at = NULL,
                     epoch = EXCLUDED.epoch
             WHERE export_job.status <> 'done' OR export_job.epoch <> EXCLUDED.epoch",
        )
        .bind(event_id)
        .bind(export_type)
        .bind(epoch)
        .execute(&mut *conn)
        .await
        .expect("enqueue_types_at_epoch");
    }
}

/// SRC: `services/export.rs::claim_job` — verbatim. `true` = we won the generation.
pub async fn claim_job(pool: &PgPool, event_id: Uuid, export_type: &str, epoch: i64) -> bool {
    sqlx::query(
        "UPDATE export_job SET status = 'running'
         WHERE event_id = $1 AND type = $2::export_type
           AND epoch = $3 AND status = 'pending'",
    )
    .bind(event_id)
    .bind(export_type)
    .bind(epoch)
    .execute(pool)
    .await
    .expect("claim_job")
    .rows_affected()
        > 0
}

/// SRC: `services/export.rs::finalize_job` — verbatim. This IS the publish step.
pub async fn finalize_job(
    pool: &PgPool,
    event_id: Uuid,
    export_type: &str,
    epoch: i64,
    file_path: &str,
) -> bool {
    sqlx::query(
        "UPDATE export_job
         SET status = 'done', progress_pct = 100, file_path = $3, completed_at = NOW()
         WHERE event_id = $1 AND type = $2::export_type
           AND epoch = $4 AND status = 'running'",
    )
    .bind(event_id)
    .bind(export_type)
    .bind(file_path)
    .bind(epoch)
    .execute(pool)
    .await
    .expect("finalize_job")
    .rows_affected()
        > 0
}

/// SRC: `services/export.rs::update_progress` — verbatim. Doubles as the worker's liveness check:
/// `false` means "your generation was retired, stop working".
pub async fn update_progress(
    pool: &PgPool,
    event_id: Uuid,
    export_type: &str,
    epoch: i64,
    pct: i16,
) -> bool {
    sqlx::query(
        "UPDATE export_job SET progress_pct = $3
         WHERE event_id = $1 AND type = $2::export_type
           AND epoch = $4 AND status = 'running'",
    )
    .bind(event_id)
    .bind(export_type)
    .bind(pct)
    .bind(epoch)
    .execute(pool)
    .await
    .expect("update_progress")
    .rows_affected()
        > 0
}

/// SRC: `services/export.rs::invalidate_and_arm` — the ViewerOnly ZIP carry-forward, verbatim.
/// Returns `rows_affected() == 1`, which is what the production code branches on.
pub async fn carry_zip_forward(pool: &PgPool, event_id: Uuid, epoch: i64) -> bool {
    sqlx::query(
        "UPDATE export_job SET epoch = $2
         WHERE event_id = $1 AND type = 'zip'::export_type
           AND status = 'done' AND epoch = $2 - 1",
    )
    .bind(event_id)
    .bind(epoch)
    .execute(pool)
    .await
    .expect("carry_zip_forward")
    .rows_affected()
        == 1
}

/// SRC: `services/export.rs::invalidate_and_arm` — the epoch bump, verbatim.
pub async fn bump_epoch(pool: &PgPool, slug: &str) -> Option<(Uuid, String, i64)> {
    sqlx::query_as(
        "UPDATE event SET export_epoch = export_epoch + 1
         WHERE slug = $1 AND export_released_at IS NOT NULL
         RETURNING id, name, export_epoch",
    )
    .bind(slug)
    .fetch_optional(pool)
    .await
    .expect("bump_epoch")
}

/// The event's authoritative epoch.
pub async fn event_epoch(pool: &PgPool, event_id: Uuid) -> i64 {
    sqlx::query_scalar("SELECT export_epoch FROM event WHERE id = $1")
        .bind(event_id)
        .fetch_one(pool)
        .await
        .expect("event_epoch")
}

/// The raw job row, bypassing `export_current` — what the WORKER sees.
pub async fn job_row(
    pool: &PgPool,
    event_id: Uuid,
    export_type: &str,
) -> Option<(String, i64, Option<String>)> {
    sqlx::query_as(
        "SELECT status::text, epoch, file_path FROM export_job
          WHERE event_id = $1 AND type = $2::export_type",
    )
    .bind(event_id)
    .bind(export_type)
    .fetch_optional(pool)
    .await
    .expect("job_row")
}

/// Does `export_current` expose this job at all? (The view itself, without the `status` filter —
/// it is what `handlers/admin.rs::export_status` reports to the host UI.)
pub async fn in_export_current(pool: &PgPool, event_id: Uuid, export_type: &str) -> bool {
    sqlx::query_scalar::<_, i64>(
        "SELECT COUNT(*) FROM export_current
          WHERE event_id = $1 AND type = $2::export_type",
    )
    .bind(event_id)
    .bind(export_type)
    .fetch_one(pool)
    .await
    .expect("in_export_current")
        > 0
}

/// THE download predicate. SRC: `handlers/admin.rs::download_export` reads exactly this shape —
/// `SELECT c.file_path FROM export_current c WHERE ... AND c.status = 'done'`. If this returns
/// `Some`, a guest can download the keepsake; if `None`, they get a 404.
pub async fn downloadable(pool: &PgPool, event_id: Uuid, export_type: &str) -> Option<String> {
    sqlx::query_scalar(
        "SELECT c.file_path FROM export_current c
          WHERE c.event_id = $1 AND c.type = $2::export_type AND c.status = 'done'",
    )
    .bind(event_id)
    .bind(export_type)
    .fetch_optional(pool)
    .await
    .expect("downloadable")
    .flatten()
}