PRAGMA foreign_keys = ON;

CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    username TEXT NOT NULL UNIQUE,
    display_name TEXT,
    password_hash TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS dayparts (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    slug TEXT NOT NULL UNIQUE,
    name TEXT NOT NULL,
    sort_order INTEGER NOT NULL
);

CREATE TABLE IF NOT EXISTS items (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    kind TEXT NOT NULL CHECK (kind IN ('food', 'meal')),
    name TEXT NOT NULL,
    category TEXT,
    note TEXT,
    photo_filename TEXT,
    availability_state TEXT NOT NULL DEFAULT 'idea' CHECK (availability_state IN ('idea', 'home', 'archived')),
    created_by INTEGER,
    updated_by INTEGER,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE SET NULL,
    FOREIGN KEY (updated_by) REFERENCES users(id) ON DELETE SET NULL
);

CREATE TABLE IF NOT EXISTS item_dayparts (
    item_id INTEGER NOT NULL,
    daypart_id INTEGER NOT NULL,
    PRIMARY KEY (item_id, daypart_id),
    FOREIGN KEY (item_id) REFERENCES items(id) ON DELETE CASCADE,
    FOREIGN KEY (daypart_id) REFERENCES dayparts(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS meal_components (
    meal_item_id INTEGER NOT NULL,
    food_item_id INTEGER NOT NULL,
    PRIMARY KEY (meal_item_id, food_item_id),
    FOREIGN KEY (meal_item_id) REFERENCES items(id) ON DELETE CASCADE,
    FOREIGN KEY (food_item_id) REFERENCES items(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS shopping_entries (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    item_id INTEGER NOT NULL,
    added_by INTEGER,
    checked_by INTEGER,
    is_checked INTEGER NOT NULL DEFAULT 0,
    added_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    checked_at TEXT,
    FOREIGN KEY (item_id) REFERENCES items(id) ON DELETE CASCADE,
    FOREIGN KEY (added_by) REFERENCES users(id) ON DELETE SET NULL,
    FOREIGN KEY (checked_by) REFERENCES users(id) ON DELETE SET NULL
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_shopping_entries_open_item
ON shopping_entries (item_id)
WHERE is_checked = 0;

CREATE TABLE IF NOT EXISTS plan_entries (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    plan_date TEXT NOT NULL,
    daypart_id INTEGER NOT NULL,
    item_id INTEGER NOT NULL,
    note TEXT,
    created_by INTEGER,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (daypart_id) REFERENCES dayparts(id) ON DELETE CASCADE,
    FOREIGN KEY (item_id) REFERENCES items(id) ON DELETE CASCADE,
    FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE SET NULL
);

CREATE INDEX IF NOT EXISTS idx_items_kind_name
ON items (kind, name);

CREATE INDEX IF NOT EXISTS idx_items_availability_name
ON items (availability_state, name);

CREATE INDEX IF NOT EXISTS idx_item_dayparts_daypart_item
ON item_dayparts (daypart_id, item_id);

CREATE INDEX IF NOT EXISTS idx_plan_entries_plan_date_daypart
ON plan_entries (plan_date, daypart_id);