//! Integration tests of `kvitt-import` (SPEC §10.8, FR-17 AC-17.1 to AC-17.6) over synthetic fixtures only, against
//! a temporary database built with the server's migrations. Member names, descriptions and amounts are made up.

use std::collections::BTreeMap;
use std::path::{Path, PathBuf};
use std::process::Command;

use chrono::{DateTime, Utc};
use kvitt_import::amount::Rate;
use kvitt_import::categories::CategoryTable;
use kvitt_import::{ImportError, Options, Report, UserArg};
use kvitt_server::audit::SqlAuditWriter;
use kvitt_server::auth::sha256_hex;
use kvitt_server::db;
use kvitt_server::time::parse_ts;
use sqlx::SqlitePool;
use uuid::Uuid;

const OWNER: &str = "0192c000-0000-7000-8000-000000000001";
const PARTNER: &str = "0192c000-0000-7000-8000-000000000002";
const OWNER_NAME: &str = "Alex Example";
const PARTNER_NAME: &str = "Robin Sample";
const NOW: &str = "2026-10-17T12:00:00.000Z";

fn now() -> DateTime<Utc> {
    parse_ts(NOW).unwrap()
}

fn fixture(name: &str) -> PathBuf {
    Path::new(env!("CARGO_MANIFEST_DIR"))
        .join("tests/fixtures")
        .join(name)
}

/// A migrated database with the two synthetic users, removed on drop.
struct TestDb {
    dir: PathBuf,
    path: PathBuf,
}

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

impl TestDb {
    async fn new() -> Self {
        let dir = std::env::temp_dir().join(format!("kvitt-import-{}", Uuid::now_v7()));
        std::fs::create_dir_all(&dir).unwrap();
        let path = dir.join("kvitt.sqlite");
        let pool = db::connect(&path).await.unwrap();
        db::migrate(&pool).await.unwrap();
        for (id, role, name, version) in [
            (OWNER, "admin", "Alex", 15),
            (PARTNER, "member", "Robin", 16),
        ] {
            sqlx::query(
                "INSERT INTO users (id, role, display_name, picture_version, created_at, updated_at, server_version) \
                 VALUES (?, ?, ?, NULL, '2026-10-01T00:00:00.000Z', '2026-10-01T00:00:00.000Z', ?)",
            )
            .bind(id)
            .bind(role)
            .bind(name)
            .bind(version)
            .execute(&pool)
            .await
            .unwrap();
        }
        // After the fourteen seeded categories (server_version 1 to 14, SPEC §14.1.1) and the two users.
        sqlx::query("UPDATE sync_sequence SET value = 16")
            .execute(&pool)
            .await
            .unwrap();
        pool.close().await;
        Self { dir, path }
    }

    async fn pool(&self) -> SqlitePool {
        db::connect(&self.path).await.unwrap()
    }

    async fn scalar(&self, sql: &str) -> i64 {
        let pool = self.pool().await;
        let value: i64 = sqlx::query_scalar(sqlx::AssertSqlSafe(sql.to_owned()))
            .fetch_one(&pool)
            .await
            .unwrap();
        pool.close().await;
        value
    }

    /// Row counts of every table the importer may write, plus the sequence value.
    async fn snapshot(&self) -> Vec<i64> {
        let mut out = Vec::new();
        for table in [
            "accounts",
            "account_default_shares",
            "expenses",
            "expense_splits",
            "settlements",
            "settlement_allocations",
            "audit_log",
            "sync_mutations",
        ] {
            out.push(self.scalar(&format!("SELECT COUNT(*) FROM {table}")).await);
        }
        out.push(self.scalar("SELECT value FROM sync_sequence").await);
        out
    }

    fn options(&self, file: &str, account: &str) -> Options {
        Options {
            db: self.path.clone(),
            file: fixture(file),
            account: account.to_owned(),
            users: vec![
                UserArg {
                    splitwise_name: OWNER_NAME.into(),
                    kvitt_user: OWNER.into(),
                },
                UserArg {
                    splitwise_name: PARTNER_NAME.into(),
                    kvitt_user: PARTNER.into(),
                },
            ],
            fx: BTreeMap::new(),
            dry_run: false,
        }
    }

    async fn import(&self, options: &Options) -> Result<Report, ImportError> {
        kvitt_import::run(options, now(), &SqlAuditWriter).await
    }
}

/// `(payer, split_mode, amount, owner share, partner share, owner bp, description, notes, category key, key)` of
/// every expense, by expense date and id.
type ExpenseLine = (
    String,
    String,
    i64,
    i64,
    i64,
    Option<i64>,
    String,
    String,
    String,
    String,
);

/// `(entity_type, action, source, actor_user_id, actor_device_id, client_at, server_at, changes)`.
type AuditLine = (
    String,
    String,
    String,
    String,
    Option<String>,
    String,
    String,
    String,
);

async fn expenses(db: &TestDb) -> Vec<ExpenseLine> {
    let pool = db.pool().await;
    let rows: Vec<ExpenseLine> = sqlx::query_as(
        "SELECT e.payer_user_id, e.split_mode, e.amount_ore, so.share_ore, sp.share_ore, so.share_bp, \
         e.description, e.notes, c.default_key, e.import_key FROM expenses e \
         JOIN expense_splits so ON so.expense_id = e.id AND so.user_id = ?1 \
         JOIN expense_splits sp ON sp.expense_id = e.id AND sp.user_id = ?2 \
         JOIN categories c ON c.id = e.category_id ORDER BY e.expense_date, e.id",
    )
    .bind(OWNER)
    .bind(PARTNER)
    .fetch_all(&pool)
    .await
    .unwrap();
    pool.close().await;
    rows
}

#[tokio::test]
async fn english_export_imports_expenses_settlements_and_audit() {
    let db = TestDb::new().await;
    let report = db
        .import(&db.options("english.csv", "Shared"))
        .await
        .unwrap();
    assert!(report.committed);
    assert!(report.account_created);
    assert_eq!(report.rows_read, 10);
    assert_eq!(report.totals_rows, 1);
    assert_eq!(report.expenses_created, 9);
    assert_eq!(report.settlements_created, 1);
    assert_eq!(report.skipped_duplicates, 0);
    assert_eq!(report.non_sek_rows, 0);
    assert_eq!(
        report.unmapped_categories,
        BTreeMap::from([("Widgets".to_owned(), 1)])
    );
    assert_eq!(report.unmapped_rows(), 1);
    assert!(report.reconciliation.matched);
    assert_eq!(report.exit_code(), 0);
    let summary = report.to_string();
    assert!(summary.contains("Widgets: 1 rows"), "{summary}");
    assert!(
        summary.contains("WARNING: 1 rows with an unmapped category"),
        "{summary}"
    );
    assert!(summary.contains("result: match"), "{summary}");

    // The account: created by the owner with the default 50/50 ratio.
    assert_eq!(
        db.scalar("SELECT COUNT(*) FROM accounts WHERE name = 'Shared' AND created_by_user_id = '0192c000-0000-7000-8000-000000000001'")
            .await,
        1
    );
    assert_eq!(
        db.scalar("SELECT COUNT(*) FROM account_default_shares WHERE share_bp = 5000")
            .await,
        2
    );

    let rows = expenses(&db).await;
    assert_eq!(rows.len(), 9);
    // Owner paid, exact split from the nets.
    assert_eq!(
        (
            &rows[0].0[..],
            &rows[0].1[..],
            rows[0].2,
            rows[0].3,
            rows[0].4,
            rows[0].5
        ),
        (OWNER, "exact", 30000, 15000, 15000, None)
    );
    assert_eq!(rows[0].8, "groceries");
    // Quoted description with a comma; partner paid.
    assert_eq!(rows[1].6, "Paint, brushes and tape");
    assert_eq!(
        (&rows[1].0[..], rows[1].3, rows[1].4),
        (PARTNER, 6025, 6025)
    );
    assert_eq!(rows[1].8, "home");
    // Both nets 0: full on the owner.
    assert_eq!(
        (
            &rows[2].0[..],
            &rows[2].1[..],
            rows[2].3,
            rows[2].4,
            rows[2].5
        ),
        (OWNER, "full", 20000, 0, Some(10_000))
    );
    assert_eq!(rows[2].8, "entertainment");
    // Partner paid all of it for the owner: payer share 0.
    assert_eq!((&rows[3].0[..], rows[3].3, rows[3].4), (PARTNER, 10000, 0));
    assert_eq!(rows[3].8, "transport");
    // Unknown category to other.
    assert_eq!(rows[4].8, "other");
    // Two identical lines both imported, with different keys.
    assert_eq!(rows[5].6, "Coffee");
    assert_eq!(rows[6].6, "Coffee");
    assert_ne!(rows[5].9, rows[6].9);
    // Truncated description: 100 code points, the full text in notes.
    assert_eq!(rows[7].6.chars().count(), 100);
    assert!(rows[7].7.starts_with(&rows[7].6));
    assert_eq!(rows[7].7.chars().count(), 127);
    assert_eq!(rows[8].6, "Rent, January");
    // Rent is housing since D-053.
    assert_eq!(rows[8].8, "housing");
    assert!(
        rows.iter()
            .all(|r| r.7.is_empty() || r.6.chars().count() == 100)
    );

    // The import key formula of SPEC §10.8, for the first row and for the second of the two identical lines.
    let key = |line: &str, n: usize| {
        let fields: Vec<&str> = line.split(',').collect();
        sha256_hex(&format!("splitwise|v1|Shared|{}|{n}", fields.join("|")))
    };
    assert_eq!(
        rows[0].9,
        key(
            "2025-01-05,Weekly shop,Groceries,300.00,SEK,150.00,-150.00",
            0
        )
    );
    assert_eq!(
        rows[6].9,
        key("2025-01-10,Coffee,Dining out,40.00,SEK,20.00,-20.00", 1)
    );

    // The payment: a settlement from the positive-net member, one allocation to the account.
    let pool = db.pool().await;
    let settlement: (String, String, i64, String, String, i64, i64) = sqlx::query_as(
        "SELECT s.from_user_id, s.to_user_id, s.amount_ore, s.note, s.settlement_date, \
         (SELECT COUNT(*) FROM settlement_allocations a WHERE a.settlement_id = s.id), \
         (SELECT SUM(a.amount_ore) FROM settlement_allocations a JOIN accounts ac ON ac.id = a.account_id \
          WHERE a.settlement_id = s.id AND ac.name = 'Shared') FROM settlements s",
    )
    .fetch_one(&pool)
    .await
    .unwrap();
    assert_eq!(
        settlement,
        (
            PARTNER.to_owned(),
            OWNER.to_owned(),
            10000,
            "Robin paid Alex".to_owned(),
            "2025-01-12".to_owned(),
            1,
            10000
        )
    );

    // Created rows: owner as creator and updater, no device, import time, server_received_at set.
    for table in ["expenses", "settlements"] {
        let odd: i64 = sqlx::query_scalar(sqlx::AssertSqlSafe(format!(
            "SELECT COUNT(*) FROM {table} WHERE created_by_user_id <> ?1 OR updated_by_user_id <> ?1 \
             OR updated_by_device_id IS NOT NULL OR created_at <> ?2 OR updated_at <> ?2 OR deleted_at IS NOT NULL \
             OR import_key IS NULL OR length(import_key) <> 64"
        )))
        .bind(OWNER)
        .bind(NOW)
        .fetch_one(&pool)
        .await
        .unwrap();
        assert_eq!(odd, 0, "{table}");
    }

    // One audit create per row, source import, actor the owner, no device, both times the import time, with
    // the create diff of SPEC §14.4.7.
    let audits: Vec<AuditLine> = sqlx::query_as(
        "SELECT entity_type, action, source, actor_user_id, actor_device_id, client_at, server_at, changes \
         FROM audit_log ORDER BY server_version",
    )
    .fetch_all(&pool)
    .await
    .unwrap();
    assert_eq!(audits.len(), 10);
    assert_eq!(audits.iter().filter(|a| a.0 == "expense").count(), 9);
    assert_eq!(audits.iter().filter(|a| a.0 == "settlement").count(), 1);
    for a in &audits {
        assert_eq!((&a.1[..], &a.2[..], &a.3[..]), ("create", "import", OWNER));
        assert_eq!(a.4, None);
        assert_eq!((&a.5[..], &a.6[..]), (NOW, NOW));
        let changes: serde_json::Value = serde_json::from_str(&a.7).unwrap();
        assert!(
            changes
                .as_array()
                .unwrap()
                .iter()
                .all(|c| c["old"].is_null())
        );
    }
    let audited: i64 = sqlx::query_scalar(
        "SELECT COUNT(*) FROM audit_log a WHERE a.entity_id IN (SELECT id FROM expenses UNION SELECT id FROM settlements)",
    )
    .fetch_one(&pool)
    .await
    .unwrap();
    assert_eq!(audited, 10);

    // New server_versions from the global sequence: account + 9 expenses + 1 settlement + 10 audit entries.
    let max_version: i64 = sqlx::query_scalar("SELECT value FROM sync_sequence")
        .fetch_one(&pool)
        .await
        .unwrap();
    assert_eq!(max_version, 16 + 1 + 9 + 1 + 10);
    // No pushes: the importer has no push queue and touches no sync state.
    let mutations: i64 = sqlx::query_scalar("SELECT COUNT(*) FROM sync_mutations")
        .fetch_one(&pool)
        .await
        .unwrap();
    assert_eq!(mutations, 0);
    pool.close().await;
}

#[tokio::test]
async fn swedish_export_with_reversed_member_columns() {
    let db = TestDb::new().await;
    let report = db
        .import(&db.options("swedish.csv", "Vardagen"))
        .await
        .unwrap();
    assert!(report.committed);
    assert_eq!(report.language, kvitt_import::parse::Language::Swedish);
    assert_eq!(report.rows_read, 5);
    assert_eq!(report.expenses_created, 4);
    assert_eq!(report.settlements_created, 1);
    assert_eq!(
        report.unmapped_categories,
        BTreeMap::from([("Påhittad kategori".to_owned(), 1)])
    );
    assert!(report.reconciliation.matched);
    // Members are matched by name: the second column is the owner.
    assert_eq!(
        report.reconciliation.members[0].splitwise_name,
        PARTNER_NAME
    );
    assert_eq!(report.reconciliation.members[0].kvitt_ore, -1500);
    assert_eq!(report.reconciliation.members[1].kvitt_ore, 1500);

    let rows = expenses(&db).await;
    assert_eq!(
        (&rows[0].0[..], rows[0].3, rows[0].4),
        (OWNER, 10000, 10000)
    );
    assert_eq!(rows[0].8, "groceries");
    assert_eq!(rows[1].6, "Lampa, golv");
    assert_eq!(
        (&rows[1].0[..], rows[1].3, rows[1].4),
        (PARTNER, 4000, 4000)
    );
    assert_eq!(rows[1].8, "home");
    assert_eq!(rows[2].8, "other");
    assert_eq!(rows[3].8, "transport");
    let (from, to, amount): (String, String, i64) =
        sqlx::query_as("SELECT from_user_id, to_user_id, amount_ore FROM settlements")
            .fetch_one(&db.pool().await)
            .await
            .unwrap();
    assert_eq!((&from[..], &to[..], amount), (PARTNER, OWNER, 5500));
}

#[tokio::test]
async fn rerun_creates_nothing_and_existing_account_is_reused() {
    let db = TestDb::new().await;
    let first = db
        .import(&db.options("english.csv", "Shared"))
        .await
        .unwrap();
    assert!(first.committed);
    let before = db.snapshot().await;
    // Same file, account name in another case: the existing account, every row skipped.
    let second = db
        .import(&db.options("english.csv", "SHARED"))
        .await
        .unwrap();
    assert!(second.committed);
    assert_eq!(second.account_name, "Shared");
    assert!(!second.account_created);
    assert_eq!(second.account_id, first.account_id);
    assert_eq!(second.expenses_created, 0);
    assert_eq!(second.settlements_created, 0);
    assert_eq!(second.skipped_duplicates, 10);
    assert!(second.reconciliation.matched);
    assert_eq!(db.snapshot().await, before);

    // A second file goes into a second account; the account name is part of the key.
    let other = db
        .import(&db.options("swedish.csv", "Other group"))
        .await
        .unwrap();
    assert!(other.account_created);
    assert_eq!(other.expenses_created, 4);
}

#[tokio::test]
async fn existing_account_matched_case_insensitively() {
    let db = TestDb::new().await;
    let first = db
        .import(&db.options("swedish.csv", "Vardag"))
        .await
        .unwrap();
    let second = db
        .import(&db.options("english.csv", "  vardag "))
        .await
        .unwrap();
    assert!(!second.account_created);
    assert_eq!(second.account_id, first.account_id);
    // The balance now holds both files, so it no longer equals the second file's totals: rolled back.
    assert!(!second.reconciliation.matched);
    assert!(!second.committed);
    assert_eq!(second.exit_code(), kvitt_import::EXIT_MISMATCH);
    assert_eq!(db.scalar("SELECT COUNT(*) FROM expenses").await, 4);
}

#[tokio::test]
async fn dry_run_writes_nothing_and_reports_the_same_counts() {
    let db = TestDb::new().await;
    let before = db.snapshot().await;
    let mut options = db.options("english.csv", "Shared");
    options.dry_run = true;
    let report = db.import(&options).await.unwrap();
    assert!(report.dry_run);
    assert!(!report.committed);
    assert_eq!(report.expenses_created, 9);
    assert_eq!(report.settlements_created, 1);
    assert_eq!(report.unmapped_rows(), 1);
    assert!(report.reconciliation.matched);
    assert_eq!(report.exit_code(), 0);
    assert!(report.to_string().contains("dry run, nothing written"));
    assert_eq!(db.snapshot().await, before);

    // After a real import, a dry run reports every row as a duplicate.
    options.dry_run = false;
    db.import(&options).await.unwrap();
    options.dry_run = true;
    let again = db.import(&options).await.unwrap();
    assert_eq!(again.skipped_duplicates, 10);
    assert_eq!(again.expenses_created, 0);
}

#[tokio::test]
async fn invalid_row_aborts_with_nothing_written() {
    let db = TestDb::new().await;
    let before = db.snapshot().await;
    match db.import(&db.options("invalid_nets.csv", "Shared")).await {
        Err(ImportError::InvalidRows(problems)) => {
            assert_eq!(problems.len(), 1);
            assert_eq!(problems[0].line, 4);
            assert!(
                problems[0].reason.contains("sum to 0"),
                "{}",
                problems[0].reason
            );
        }
        other => panic!("{other:?}"),
    }
    // A row the server's checks reject (an impossible date) also aborts the whole file.
    match db.import(&db.options("invalid_date.csv", "Shared")).await {
        Err(e @ ImportError::InvalidRows(_)) => {
            assert_eq!(e.exit_code(), kvitt_import::EXIT_INVALID);
            let ImportError::InvalidRows(problems) = e else {
                unreachable!()
            };
            assert_eq!(problems.len(), 1);
            assert_eq!(problems[0].line, 4);
            assert!(
                problems[0].reason.starts_with("validation_failed"),
                "{}",
                problems[0].reason
            );
        }
        other => panic!("{other:?}"),
    }
    assert_eq!(db.snapshot().await, before);
}

#[tokio::test]
async fn header_failures_write_nothing() {
    let db = TestDb::new().await;
    let before = db.snapshot().await;
    for file in ["bad_header.csv", "wrong_member.csv"] {
        match db.import(&db.options(file, "Shared")).await {
            Err(e @ ImportError::Header(_)) => {
                assert_eq!(e.exit_code(), kvitt_import::EXIT_INVALID)
            }
            other => panic!("{file}: {other:?}"),
        }
    }
    assert_eq!(db.snapshot().await, before);
}

#[tokio::test]
async fn non_sek_aborts_without_fx_and_converts_with_it() {
    let db = TestDb::new().await;
    let before = db.snapshot().await;
    let mut options = db.options("non_sek.csv", "Trip");
    match db.import(&options).await {
        Err(ImportError::MissingFx(currencies)) => {
            // One data row and one totals row in EUR.
            assert_eq!(currencies, BTreeMap::from([("EUR".to_owned(), 2)]));
        }
        other => panic!("{other:?}"),
    }
    assert_eq!(db.snapshot().await, before);

    options
        .fx
        .insert("EUR".into(), Rate::parse("11.5").unwrap());
    let report = db.import(&options).await.unwrap();
    assert!(report.committed);
    assert_eq!(report.non_sek_rows, 1);
    assert_eq!(report.expenses_created, 2);
    assert!(report.reconciliation.matched);
    let rows = expenses(&db).await;
    // 10.00 EUR × 11.5 = 115.00 SEK; the partner's share 5.00 EUR = 57.50 SEK; the payer's share is the rest.
    assert_eq!((rows[1].2, rows[1].3, rows[1].4), (11500, 5750, 5750));
}

#[tokio::test]
async fn reconciliation_mismatch_or_missing_totals_rolls_back() {
    let db = TestDb::new().await;
    let before = db.snapshot().await;
    let report = db
        .import(&db.options("mismatch.csv", "Shared"))
        .await
        .unwrap();
    assert!(!report.reconciliation.matched);
    assert!(!report.committed);
    assert_eq!(report.exit_code(), kvitt_import::EXIT_MISMATCH);
    let summary = report.to_string();
    assert!(summary.contains("splitwise 7.00, kvitt 5.00"), "{summary}");
    assert!(summary.contains("result: MISMATCH"), "{summary}");
    assert_eq!(db.snapshot().await, before);

    let report = db
        .import(&db.options("no_totals.csv", "Shared"))
        .await
        .unwrap();
    assert!(!report.reconciliation.has_totals);
    assert!(!report.committed);
    assert_eq!(report.exit_code(), kvitt_import::EXIT_MISMATCH);
    assert_eq!(db.snapshot().await, before);
}

#[tokio::test]
async fn users_resolve_by_display_name_and_must_be_the_household() {
    let db = TestDb::new().await;
    let mut options = db.options("english.csv", "Shared");
    options.users[0].kvitt_user = "Alex".into();
    options.users[1].kvitt_user = "Robin".into();
    let report = db.import(&options).await.unwrap();
    assert!(report.committed);
    assert_eq!(report.reconciliation.members[0].user_id, OWNER);

    let mut both_same = db.options("english.csv", "Other");
    both_same.users[1].kvitt_user = OWNER.into();
    assert!(matches!(
        db.import(&both_same).await,
        Err(ImportError::Usage(_))
    ));
    let mut unknown = db.options("english.csv", "Other");
    unknown.users[1].kvitt_user = "Nobody".into();
    assert!(matches!(
        db.import(&unknown).await,
        Err(ImportError::Usage(_))
    ));
    let mut one = db.options("english.csv", "Other");
    one.users.pop();
    assert!(matches!(db.import(&one).await, Err(ImportError::Usage(_))));
}

#[tokio::test]
async fn missing_database_is_not_created() {
    let db = TestDb::new().await;
    let mut options = db.options("english.csv", "Shared");
    options.db = db.dir.join("absent.sqlite");
    assert!(matches!(db.import(&options).await, Err(ImportError::Io(_))));
    assert!(!options.db.exists());
}

/// The finer mapping of D-053: every new default key is reached from English and Swedish Splitwise names, with
/// nothing unmapped.
#[tokio::test]
async fn finer_mapping_reaches_the_four_new_defaults() {
    for (file, keys) in [
        (
            "english_finer.csv",
            &["insurance", "children", "fees", "housing"][..],
        ),
        (
            "swedish_finer.csv",
            &[
                "insurance",
                "children",
                "fees",
                "housing",
                "housing",
                "utilities",
                "home",
            ][..],
        ),
    ] {
        let db = TestDb::new().await;
        let report = db.import(&db.options(file, "Hemma")).await.unwrap();
        assert!(report.committed, "{file}");
        assert_eq!(report.unmapped_rows(), 0, "{file}");
        assert!(report.reconciliation.matched, "{file}");
        assert_eq!(report.expenses_created, keys.len(), "{file}");
        let rows = expenses(&db).await;
        let actual: Vec<&str> = rows.iter().map(|r| r.8.as_str()).collect();
        assert_eq!(actual, keys, "{file}");
    }
    // A Försäkringar / Insurance row lands in the insurance default (id …012), not in Övrigt.
    let db = TestDb::new().await;
    db.import(&db.options("swedish_finer.csv", "Hemma"))
        .await
        .unwrap();
    assert_eq!(
        db.scalar(
            "SELECT COUNT(*) FROM expenses WHERE description = 'Hemförsäkring' \
             AND category_id = '01920000-0000-7000-8000-000000000012'"
        )
        .await,
        1
    );
}

/// The importer requires the schema version the server's migrations produce (SPEC §10.8, D-054): a database still
/// at schema 1 is refused with exit 1 and nothing written, and imports once migrated.
#[tokio::test]
async fn a_schema_1_database_is_refused_until_migrated() {
    let dir = std::env::temp_dir().join(format!("kvitt-import-{}", Uuid::now_v7()));
    std::fs::create_dir_all(&dir).unwrap();
    let path = dir.join("kvitt.sqlite");
    let pool = db::connect(&path).await.unwrap();
    db::MIGRATOR.run_to(1, &pool).await.unwrap();
    pool.close().await;
    let refused = kvitt_import::open(&path).await;
    match refused {
        Err(ImportError::Io(message)) => {
            assert!(message.contains("expected 2"), "{message}");
            assert!(message.contains("kvitt-server migrate"), "{message}");
        }
        Err(other) => panic!("expected a database error, got {other:?}"),
        Ok(_) => panic!("a schema 1 database was accepted"),
    }
    let pool = db::connect(&path).await.unwrap();
    db::migrate(&pool).await.unwrap();
    pool.close().await;
    let opened = kvitt_import::open(&path).await.unwrap();
    opened.close().await;
    let _ = std::fs::remove_dir_all(&dir);
}

/// Every category name of the SPEC §10.8 table is in the committed data file exactly once, with its key, and the
/// file holds nothing else.
#[test]
fn category_table_matches_the_spec() {
    let spec =
        std::fs::read_to_string(Path::new(env!("CARGO_MANIFEST_DIR")).join("../../../SPEC.md"))
            .unwrap();
    let section = spec.split("### 10.8 Splitwise import").nth(1).unwrap();
    let section = section.split("\n### ").next().unwrap();
    let mut expected: Vec<(String, String, String)> = Vec::new();
    for line in section.lines() {
        let cells: Vec<&str> = line
            .trim()
            .trim_matches('|')
            .split('|')
            .map(str::trim)
            .collect();
        if cells.len() != 3 || !cells[2].starts_with('`') || cells[0].starts_with("any other") {
            continue;
        }
        let key = cells[2].trim_matches('`').to_owned();
        for (column, language) in [(cells[0], "en"), (cells[1], "sv")] {
            for name in column.split(", ") {
                expected.push((name.to_owned(), language.to_owned(), key.clone()));
            }
        }
    }
    assert!(
        expected.len() > 60,
        "parsed {} names from the spec",
        expected.len()
    );
    let table = CategoryTable::committed().unwrap();
    let mut actual: Vec<(String, String, String)> = table
        .entries
        .iter()
        .map(|e| {
            (
                e.splitwise_name.clone(),
                e.language.clone(),
                e.default_key.clone(),
            )
        })
        .collect();
    expected.sort();
    actual.sort();
    assert_eq!(actual, expected);
}

fn binary() -> Command {
    Command::new(env!("CARGO_BIN_EXE_kvitt-import"))
}

fn cli_args(db: &TestDb, file: &str, account: &str) -> Vec<String> {
    vec![
        "--db".into(),
        db.path.to_string_lossy().into_owned(),
        "--file".into(),
        fixture(file).to_string_lossy().into_owned(),
        "--account".into(),
        account.into(),
        "--user".into(),
        format!("{OWNER_NAME}={OWNER}"),
        "--user".into(),
        format!("{PARTNER_NAME}=Robin"),
    ]
}

#[test]
fn cli_help_and_usage_errors() {
    let help = binary().arg("--help").output().unwrap();
    assert!(help.status.success());
    let text = String::from_utf8_lossy(&help.stdout);
    for option in [
        "--db",
        "--file",
        "--account",
        "--user",
        "--fx",
        "--dry-run",
        "Exit status",
    ] {
        assert!(text.contains(option), "{option}: {text}");
    }
    let missing = binary().args(["--db", "x"]).output().unwrap();
    assert_eq!(missing.status.code(), Some(2));
    let bad_fx = binary()
        .args([
            "--db",
            "x",
            "--file",
            "y",
            "--account",
            "A",
            "--user",
            "a=b",
            "--user",
            "c=d",
            "--fx",
            "EUR",
        ])
        .output()
        .unwrap();
    assert_eq!(bad_fx.status.code(), Some(2));
}

#[tokio::test]
async fn cli_end_to_end_exit_codes() {
    let db = TestDb::new().await;
    let mut dry = cli_args(&db, "swedish.csv", "Vardag");
    dry.push("--dry-run".into());
    let out = binary().args(&dry).output().unwrap();
    assert_eq!(
        out.status.code(),
        Some(0),
        "{}",
        String::from_utf8_lossy(&out.stderr)
    );
    assert!(String::from_utf8_lossy(&out.stdout).contains("dry run"));
    assert_eq!(db.scalar("SELECT COUNT(*) FROM expenses").await, 0);

    let out = binary()
        .args(cli_args(&db, "swedish.csv", "Vardag"))
        .output()
        .unwrap();
    assert_eq!(
        out.status.code(),
        Some(0),
        "{}",
        String::from_utf8_lossy(&out.stderr)
    );
    let stdout = String::from_utf8_lossy(&out.stdout);
    assert!(stdout.contains("expenses created: 4"), "{stdout}");
    assert!(stdout.contains("result: match"), "{stdout}");
    assert_eq!(db.scalar("SELECT COUNT(*) FROM expenses").await, 4);
    assert_eq!(
        db.scalar("SELECT COUNT(*) FROM audit_log WHERE source = 'import'")
            .await,
        5
    );

    let out = binary()
        .args(cli_args(&db, "invalid_nets.csv", "Other"))
        .output()
        .unwrap();
    assert_eq!(out.status.code(), Some(3));
    assert!(String::from_utf8_lossy(&out.stderr).contains("line 4"));
    let out = binary()
        .args(cli_args(&db, "mismatch.csv", "Other"))
        .output()
        .unwrap();
    assert_eq!(out.status.code(), Some(4));
    let out = binary()
        .args(cli_args(&db, "bad_header.csv", "Other"))
        .output()
        .unwrap();
    assert_eq!(out.status.code(), Some(3));
    assert_eq!(db.scalar("SELECT COUNT(*) FROM accounts").await, 1);
}