DROP SCHEMA IF EXISTS haystack CASCADE;

CREATE SCHEMA haystack;

/* -----| Enums |----- */

CREATE TYPE haystack.progress AS ENUM('not-started','in-progress', 'complete');

/* -----| Schema tables |----- */

CREATE TABLE haystack.users (
	id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    email TEXT NOT NULL
);

CREATE TABLE haystack.image (
	id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    image_name TEXT NOT NULL,
    description TEXT NOT NULL,
	image BYTEA NOT NULL
);

CREATE TABLE haystack.user_images_to_process (
	id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    status haystack.progress NOT NULL DEFAULT 'not-started',
	image_id uuid NOT NULL UNIQUE REFERENCES haystack.image (id),
	user_id uuid NOT NULL REFERENCES haystack.users (id)
);

CREATE TABLE haystack.user_images (
	id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    image_id uuid NOT NULL UNIQUE REFERENCES haystack.image (id),
	user_id uuid NOT NULL REFERENCES haystack.users (id),

    created_at TIMESTAMP WITH TIME ZONE DEFAULT now()
);

CREATE TABLE haystack.logs (
    log TEXT NOT NULL,
    image_id UUID NOT NULL REFERENCES haystack.image (id),

    created_at TIMESTAMP WITH TIME ZONE DEFAULT now()
);

CREATE TABLE haystack.lists (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES haystack.users (id),

    name TEXT NOT NULL,
    description TEXT NOT NULL,

    created_at TIMESTAMP WITH TIME ZONE DEFAULT now()
);

CREATE TABLE haystack.image_lists (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    image_id UUID NOT NULL REFERENCES haystack.image (id),
    list_id UUID NOT NULL REFERENCES haystack.lists (id)
);

CREATE TABLE haystack.schemas (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    list_id UUID NOT NULL REFERENCES haystack.lists (id)
);

CREATE TABLE haystack.schema_items (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    item TEXT NOT NULL,
    value TEXT NOT NULL,
    description TEXT NOT NULL,

    schema_id UUID NOT NULL REFERENCES haystack.schemas (id)
);

CREATE TABLE haystack.image_schema_items (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    value TEXT,

    schema_item_id UUID NOT NULL REFERENCES haystack.schema_items (id),
    image_id UUID NOT NULL REFERENCES haystack.image (id)
);

/* -----| Indexes |----- */

/* -----| Stored Procedures |----- */

CREATE OR REPLACE FUNCTION notify_new_image()
RETURNS TRIGGER AS $$
BEGIN
	PERFORM pg_notify('new_image', NEW.id::texT);
	RETURN NEW;
END
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION notify_new_processing_image_status()
RETURNS TRIGGER AS $$
BEGIN
PERFORM pg_notify('new_processing_image_status', NEW.id::text || NEW.status::text);
	RETURN NEW;
END
$$ LANGUAGE plpgsql;

/* -----| Triggers |----- */

CREATE OR REPLACE TRIGGER on_new_image AFTER INSERT
ON haystack.user_images_to_process
FOR EACH ROW
EXECUTE PROCEDURE notify_new_image();

CREATE OR REPLACE TRIGGER on_update_image_progress 
AFTER UPDATE OF status
ON haystack.user_images_to_process
FOR EACH ROW
EXECUTE PROCEDURE notify_new_processing_image_status();

/* -----| Test Data |----- */