rdbms-playground/tests/walking_skeleton.rs

//! Tier 3 integration tests for the walking skeleton (per ADR-0008).
//!
//! These tests drive synthetic crossterm events through `App::update`
//! and assert on the resulting state and rendered buffer. They
//! exercise the full input → state → render path without a real
//! terminal, so they run on every commit and catch regressions in
//! the wiring between modules.

use crossterm::event::{KeyCode, KeyEvent, KeyEventKind, KeyModifiers};
use ratatui::Terminal;
use ratatui::backend::TestBackend;

use rdbms_playground::action::Action;
use rdbms_playground::app::{App, OutputKind};
use rdbms_playground::db::{ColumnDescription, TableDescription};
use rdbms_playground::dsl::{ColumnSpec, Command, Type};
use rdbms_playground::event::AppEvent;
use rdbms_playground::mode::Mode;
use rdbms_playground::theme::Theme;
use rdbms_playground::ui;

const fn key(code: KeyCode) -> AppEvent {
    AppEvent::Key(KeyEvent {
        code,
        modifiers: KeyModifiers::NONE,
        kind: KeyEventKind::Press,
        state: crossterm::event::KeyEventState::NONE,
    })
}

fn type_str(app: &mut App, s: &str) -> Vec<Action> {
    let mut actions = Vec::new();
    for c in s.chars() {
        actions.extend(app.update(key(KeyCode::Char(c))));
    }
    actions
}

fn submit(app: &mut App) -> Vec<Action> {
    app.update(key(KeyCode::Enter))
}

fn rendered_text(app: &App, theme: &Theme, width: u16, height: u16) -> String {
    let backend = TestBackend::new(width, height);
    let mut terminal = Terminal::new(backend).expect("create terminal");
    terminal
        .draw(|f| ui::render(app, theme, f))
        .expect("draw frame");
    let buffer = terminal.backend().buffer().clone();
    let mut out = String::new();
    for y in 0..buffer.area.height {
        for x in 0..buffer.area.width {
            out.push_str(buffer[(x, y)].symbol());
        }
        out.push('\n');
    }
    out
}

#[test]
fn typing_then_submitting_a_dsl_command_emits_execute_action() {
    let mut app = App::new();
    let theme = Theme::dark();

    type_str(&mut app, "create table Customers with pk");
    let pre_render = rendered_text(&app, &theme, 80, 24);
    assert!(
        pre_render.contains("create table Customers"),
        "input field should display the typed text:\n{pre_render}"
    );

    let actions = submit(&mut app);
    assert_eq!(
        actions,
        vec![Action::ExecuteDsl(Command::CreateTable {
            name: "Customers".to_string(),
            columns: vec![ColumnSpec {
                name: "id".to_string(),
                ty: Type::Serial,
            }],
            primary_key: vec!["id".to_string()],
        })]
    );
    assert!(app.input.is_empty(), "input buffer cleared on submit");
    let post_render = rendered_text(&app, &theme, 80, 24);
    assert!(
        post_render.contains("running:"),
        "output panel should show the running notice:\n{post_render}"
    );
}

#[test]
fn typing_invalid_simple_input_shows_a_parse_error_not_an_echo() {
    let mut app = App::new();
    let theme = Theme::dark();
    type_str(&mut app, "hello world");
    let actions = submit(&mut app);
    assert!(actions.is_empty());
    let rendered = rendered_text(&app, &theme, 80, 24);
    assert!(
        rendered.contains("parse error"),
        "output panel should show the parse error:\n{rendered}"
    );
}

#[test]
fn mode_switch_changes_label_and_subsequent_echoes() {
    let mut app = App::new();
    let theme = Theme::dark();

    let initial = rendered_text(&app, &theme, 80, 24);
    assert!(initial.contains("SIMPLE"));
    assert!(!initial.contains("ADVANCED"));

    type_str(&mut app, "mode advanced");
    submit(&mut app);
    assert_eq!(app.mode, Mode::Advanced);

    let after_switch = rendered_text(&app, &theme, 80, 24);
    assert!(after_switch.contains("ADVANCED"));

    type_str(&mut app, "select 1");
    submit(&mut app);
    let last = app.output.back().expect("output present");
    assert_eq!(last.mode_at_submission, Mode::Advanced);
    assert_eq!(last.kind, OutputKind::Echo);
}

#[test]
fn colon_escape_in_simple_mode_is_one_shot() {
    let mut app = App::new();
    type_str(&mut app, ":select 1");
    submit(&mut app);
    assert_eq!(app.mode, Mode::Simple);
    // Advanced mode currently echoes (SQL handling lands later);
    // the echoed line should carry the advanced submission mode.
    let echoed = app
        .output
        .iter()
        .rfind(|l| l.kind == OutputKind::Echo)
        .expect("echo output present");
    assert_eq!(echoed.mode_at_submission, Mode::Advanced);
    assert_eq!(echoed.text, "select 1");

    // Subsequent submission (unrecognised in simple mode) parse-errors,
    // not echoes — confirming the mode reverted.
    type_str(&mut app, "list things");
    submit(&mut app);
    let last = app.output.back().unwrap();
    assert_eq!(last.kind, OutputKind::Error);
    assert_eq!(last.mode_at_submission, Mode::Simple);
}

#[test]
fn quit_command_returns_quit_action() {
    let mut app = App::new();
    type_str(&mut app, "quit");
    let actions = submit(&mut app);
    assert_eq!(actions, vec![Action::Quit]);
}

#[test]
fn rendering_works_at_minimum_useful_size() {
    // Sanity check that the layout does not panic at small sizes.
    let app = App::new();
    let theme = Theme::dark();
    let _ = rendered_text(&app, &theme, 40, 12);
}

#[test]
fn typing_colon_in_simple_mode_flips_prompt_to_advanced() {
    let mut app = App::new();
    let theme = Theme::dark();

    // No `:` yet — prompt shows SIMPLE.
    type_str(&mut app, "sel");
    let before = rendered_text(&app, &theme, 80, 24);
    assert!(before.contains("SIMPLE"));
    assert!(!before.contains("Advanced:"));

    // Reset and type `:` first — prompt should flip immediately.
    app.input.clear();
    type_str(&mut app, ":");
    let after_colon = rendered_text(&app, &theme, 80, 24);
    assert!(
        after_colon.contains("Advanced:"),
        "input panel should show 'Advanced:' once `:` is typed:\n{after_colon}"
    );
    assert!(!after_colon.contains("SIMPLE"));

    // Backspace through both the auto-inserted space and the `:`
    // itself reverts the prompt.
    while !app.input.is_empty() {
        app.update(key(KeyCode::Backspace));
    }
    let after_revert = rendered_text(&app, &theme, 80, 24);
    assert!(after_revert.contains("SIMPLE"));
    assert!(!after_revert.contains("Advanced:"));
}

#[test]
fn status_bar_lists_quit_and_submit_in_all_modes() {
    let mut app = App::new();
    let theme = Theme::dark();

    let simple = rendered_text(&app, &theme, 80, 24);
    assert!(simple.contains("Enter"), "status bar lists Enter");
    assert!(simple.contains("Ctrl-C"), "status bar lists Ctrl-C");
    assert!(simple.contains("mode advanced"));

    type_str(&mut app, "mode advanced");
    submit(&mut app);
    let advanced = rendered_text(&app, &theme, 80, 24);
    assert!(advanced.contains("Enter"));
    assert!(advanced.contains("Ctrl-C"));
    assert!(advanced.contains("mode simple"));
}

// ---------------------------------------------------------------
// Full DSL flow tests.
//
// These tests simulate the runtime by feeding the AppEvent::Dsl*
// events that the runtime would post after dispatching a command
// to the database. That keeps these tests deterministic and runtime
// agnostic — the actual database is exercised in the db module's
// own #[tokio::test] suite.
// ---------------------------------------------------------------

fn fake_table(name: &str, columns: &[(&str, Type, bool)]) -> TableDescription {
    TableDescription {
        name: name.to_string(),
        columns: columns
            .iter()
            .map(|(n, t, pk)| ColumnDescription {
                name: (*n).to_string(),
                user_type: Some(*t),
                sqlite_type: t.sqlite_strict_type().to_string(),
                notnull: false,
                primary_key: *pk,
            })
            .collect(),
    }
}

#[test]
fn create_table_flow_updates_tables_list_and_structure_view() {
    let mut app = App::new();
    let theme = Theme::dark();

    // User types and submits.
    type_str(&mut app, "create table Customers with pk");
    let actions = submit(&mut app);
    let expected_cmd = Command::CreateTable {
        name: "Customers".to_string(),
        columns: vec![ColumnSpec {
            name: "id".to_string(),
            ty: Type::Serial,
        }],
        primary_key: vec!["id".to_string()],
    };
    assert_eq!(actions, vec![Action::ExecuteDsl(expected_cmd.clone())]);

    // Runtime would now dispatch and feed back DslSucceeded + TablesRefreshed.
    let desc = fake_table("Customers", &[("id", Type::Serial, true)]);
    app.update(AppEvent::DslSucceeded {
        command: expected_cmd,
        description: Some(desc.clone()),
    });
    app.update(AppEvent::TablesRefreshed(vec!["Customers".to_string()]));

    assert_eq!(app.tables, vec!["Customers".to_string()]);
    assert_eq!(app.current_table, Some(desc));

    let rendered = rendered_text(&app, &theme, 80, 24);
    assert!(
        rendered.contains("Customers"),
        "items panel should list Customers:\n{rendered}"
    );
    assert!(
        rendered.contains("[ok] create table Customers"),
        "output should confirm success:\n{rendered}"
    );
    assert!(
        rendered.contains("id serial"),
        "output should show the structure with the user-facing type:\n{rendered}"
    );
}

#[test]
fn add_column_flow_updates_structure_view() {
    let mut app = App::new();
    // Simulate the prior create_table state.
    app.tables = vec!["Customers".to_string()];
    app.current_table = Some(fake_table(
        "Customers",
        &[("id", Type::Serial, true)],
    ));

    type_str(&mut app, "add column to table Customers: Name (text)");
    let actions = submit(&mut app);
    assert_eq!(
        actions,
        vec![Action::ExecuteDsl(Command::AddColumn {
            table: "Customers".to_string(),
            column: "Name".to_string(),
            ty: Type::Text,
        })]
    );

    let updated = fake_table(
        "Customers",
        &[("id", Type::Serial, true), ("Name", Type::Text, false)],
    );
    app.update(AppEvent::DslSucceeded {
        command: Command::AddColumn {
            table: "Customers".to_string(),
            column: "Name".to_string(),
            ty: Type::Text,
        },
        description: Some(updated.clone()),
    });
    assert_eq!(app.current_table, Some(updated));
    let rendered = rendered_text(&app, &Theme::dark(), 80, 24);
    assert!(rendered.contains("Name text"));
}

#[test]
fn drop_table_flow_clears_items_list() {
    let mut app = App::new();
    app.tables = vec!["Customers".to_string()];
    app.current_table = Some(fake_table("Customers", &[("id", Type::Serial, true)]));

    type_str(&mut app, "drop table Customers");
    let actions = submit(&mut app);
    assert_eq!(
        actions,
        vec![Action::ExecuteDsl(Command::DropTable {
            name: "Customers".to_string()
        })]
    );

    app.update(AppEvent::DslSucceeded {
        command: Command::DropTable {
            name: "Customers".to_string(),
        },
        description: None,
    });
    app.update(AppEvent::TablesRefreshed(Vec::new()));

    assert!(app.tables.is_empty());
    assert!(app.current_table.is_none());
    let rendered = rendered_text(&app, &Theme::dark(), 80, 24);
    assert!(rendered.contains("(none yet)"));
    assert!(rendered.contains("[ok] drop table Customers"));
}

#[test]
fn dsl_failure_shows_friendly_error_in_output() {
    let mut app = App::new();
    type_str(&mut app, "drop table Ghost");
    submit(&mut app);
    app.update(AppEvent::DslFailed {
        command: Command::DropTable {
            name: "Ghost".to_string(),
        },
        error: "no such table: Ghost".to_string(),
    });
    let rendered = rendered_text(&app, &Theme::dark(), 80, 24);
    assert!(
        rendered.contains("Ghost"),
        "error should mention the table:\n{rendered}"
    );
    assert!(
        rendered.contains("no such table"),
        "error should include the friendly message:\n{rendered}"
    );
}