"use strict";

module.exports.up = function(knex, Promise) {
	return knex.schema
		.createTable("items", (table) => {
			// NOTE: The id is the primary name for the item
			table.text("id").notNullable().primary();
			table.jsonb("data").notNullable();
			// NOTE: created_by references an alias, and it is allowed for this to be a broken/dead reference!
			table.text("created_by");
			table.timestamp("created_at").notNullable().defaultTo(knex.fn.now());
			table.timestamp("updated_at").notNullable(); // FIXME: Maybe should be nullable?
			table.timestamp("metadata_updated_at");
		})
		.createTable("aliases", (table) => {
			table.text("alias").notNullable().primary();
			table.text("item_id").references("items.id").notNullable().onUpdate("CASCADE").onDelete("CASCADE");
		})
		.createTable("tags", (table) => {
			table.bigIncrements("id").primary();
			table.text("item_id").references("items.id").notNullable().onUpdate("CASCADE").onDelete("CASCADE");
			table.text("name").notNullable().index();
		})
		.createTable("task_results", (table) => {
			table.primary([ "task", "item_id" ]);
			table.text("task").notNullable();
			table.text("item_id").references("items.id").notNullable().onUpdate("CASCADE").onDelete("CASCADE");
			table.text("task_version").notNullable();
			table.jsonb("metadata").notNullable();
			table.boolean("is_successful").notNullable();
			table.boolean("is_invalidated").notNullable().defaultTo(false);
			table.timestamp("updated_at").notNullable().defaultTo(knex.fn.now());
			table.timestamp("expires_at");
		})
		.createTable("tasks_in_progress", (table) => {
			table.primary([ "task", "item_id" ]);
			table.text("task").notNullable();
			table.text("item_id").references("items.id").notNullable().onUpdate("CASCADE").onDelete("CASCADE");
			table.timestamp("started_at").notNullable().defaultTo(knex.fn.now());
		})
		.createTable("failures", (table) => {
			table.bigIncrements("id").primary();
			table.text("task").notNullable();
			table.text("item_id").notNullable();
			table.timestamp("occurred_at").notNullable().defaultTo(knex.fn.now());

			table.foreign([ "task", "item_id" ])
				.references([ "task", "item_id" ])
				.inTable("task_results");
		});
}

module.exports.down = function(knex, Promise) {
	return knex.schema
		.dropTable("failures")
		.dropTable("tasks_in_progress")
		.dropTable("task_results")
		.dropTable("tags")
		.dropTable("aliases")
		.dropTable("items");
}