//! Matrix coverage for ADR-0029 column constraints — the
//! `not null` / `unique` / `default` / `check` suffix on
//! `create table` & `add column`, and the `add constraint` /
//! `drop constraint` commands (ADR-0029 §2).

use crate::typing_surface::*;
use rdbms_playground::input_render::InputState;

// --- create table / add column constraint suffix --------------

#[test]
fn create_table_default_suffix_parses() {
    let a = assess_at_end(
        "create table Books with pk isbn(text) default '000'",
        &schema_empty(),
    );
    assert!(matches!(a.state, InputState::Valid));
    assert_eq!(a.parse_result.as_deref(), Ok("CreateTable"));
    crate::snap!("create_table_default_suffix", a);
}

#[test]
fn create_table_check_suffix_parses() {
    let a = assess_at_end(
        "create table Ages with pk age(int) check (age >= 0)",
        &schema_empty(),
    );
    assert!(matches!(a.state, InputState::Valid));
    assert_eq!(a.parse_result.as_deref(), Ok("CreateTable"));
    crate::snap!("create_table_check_suffix", a);
}

#[test]
fn add_column_check_suffix_parses() {
    let a = assess_at_end(
        "add column to Customers: note (text) check (note like 'A%')",
        &schema_multi_table(),
    );
    assert!(matches!(a.state, InputState::Valid));
    assert_eq!(a.parse_result.as_deref(), Ok("AddColumn"));
    crate::snap!("add_column_check_suffix", a);
}

#[test]
fn add_column_after_type_offers_constraint_keywords() {
    let a = assess_at_end(
        "add column to Customers: note (text) ",
        &schema_multi_table(),
    );
    assert_candidate_present(&a, &["not", "unique", "default", "check"]);
    crate::snap!("add_column_constraint_suffix", a);
}

// --- add constraint -------------------------------------------

#[test]
fn after_add_offers_constraint_branch() {
    let a = assess_at_end("add ", &schema_multi_table());
    assert!(matches!(a.state, InputState::IncompleteAtEof));
    assert_candidate_present(&a, &["constraint"]);
    crate::snap!("after_add_constraint_branch", a);
}

#[test]
fn add_constraint_offers_the_four_kinds() {
    let a = assess_at_end("add constraint ", &schema_multi_table());
    assert!(matches!(a.state, InputState::IncompleteAtEof));
    assert_candidate_present(&a, &["not", "unique", "default", "check"]);
    crate::snap!("add_constraint_kinds", a);
}

#[test]
fn add_constraint_to_offers_table_names() {
    let a = assess_at_end("add constraint not null to ", &schema_multi_table());
    assert!(matches!(a.state, InputState::IncompleteAtEof));
    assert_candidate_present(&a, &["Customers", "Orders"]);
    crate::snap!("add_constraint_to_tables", a);
}

#[test]
fn add_constraint_dot_narrows_to_table_columns() {
    let a = assess_at_end("add constraint unique to Orders.", &schema_multi_table());
    assert!(matches!(a.state, InputState::IncompleteAtEof));
    assert_candidate_present(&a, &["OrderId", "CustId", "Total"]);
    assert_no_candidate_named(&a, &["id", "Name"]);
    crate::snap!("add_constraint_dot_columns", a);
}

#[test]
fn complete_add_constraint_not_null_parses() {
    let a = assess_at_end(
        "add constraint not null to Customers.Name",
        &schema_multi_table(),
    );
    assert!(matches!(a.state, InputState::Valid));
    assert_eq!(a.parse_result.as_deref(), Ok("AddConstraint"));
    crate::snap!("add_constraint_not_null_complete", a);
}

#[test]
fn complete_add_constraint_default_parses() {
    let a = assess_at_end(
        "add constraint default 0 to Orders.Total",
        &schema_multi_table(),
    );
    assert!(matches!(a.state, InputState::Valid));
    assert_eq!(a.parse_result.as_deref(), Ok("AddConstraint"));
    crate::snap!("add_constraint_default_complete", a);
}

#[test]
fn complete_add_constraint_check_parses() {
    let a = assess_at_end(
        "add constraint check (Total >= 0) to Orders.Total",
        &schema_multi_table(),
    );
    assert!(matches!(a.state, InputState::Valid));
    assert_eq!(a.parse_result.as_deref(), Ok("AddConstraint"));
    crate::snap!("add_constraint_check_complete", a);
}

// --- drop constraint ------------------------------------------

#[test]
fn after_drop_offers_constraint_branch() {
    let a = assess_at_end("drop ", &schema_multi_table());
    assert!(matches!(a.state, InputState::IncompleteAtEof));
    assert_candidate_present(&a, &["constraint"]);
    crate::snap!("after_drop_constraint_branch", a);
}

#[test]
fn drop_constraint_offers_the_four_kinds() {
    let a = assess_at_end("drop constraint ", &schema_multi_table());
    assert!(matches!(a.state, InputState::IncompleteAtEof));
    assert_candidate_present(&a, &["not", "unique", "default", "check"]);
    crate::snap!("drop_constraint_kinds", a);
}

#[test]
fn complete_drop_constraint_parses() {
    let a = assess_at_end(
        "drop constraint unique from Customers.Name",
        &schema_multi_table(),
    );
    assert!(matches!(a.state, InputState::Valid));
    assert_eq!(a.parse_result.as_deref(), Ok("DropConstraint"));
    crate::snap!("drop_constraint_complete", a);
}