import {Knex} from 'knex';

export async function up(knex:Knex) {
    await knex.schema.createTable("users",(b)=>{
        b.string("username").primary().comment("user's login id");
        b.string("password_hash",64).notNullable();
        b.string("password_salt",64).notNullable();
    });
    await knex.schema.createTable("document",(b)=>{
        b.increments("id").primary();
        b.string("title").notNullable();
        b.string("content_type",16).notNullable();
        b.string("basepath",256).notNullable().comment("directory path for resource");
        b.string("filename",256).notNullable().comment("filename");
        b.string("content_hash").nullable();
        b.json("additional").nullable();
        b.integer("created_at").notNullable();
        b.integer("deleted_at");
        b.index("content_type","content_type_index");
    });
    await knex.schema.createTable("tags", (b)=>{
        b.string("name").primary();
        b.text("description");
    });
    await knex.schema.createTable("doc_tag_relation",(b)=>{
        b.integer("doc_id").unsigned().notNullable();
        b.string("tag_name").notNullable();
        b.foreign("doc_id").references("document.id");
        b.foreign("tag_name").references("tags.name");
        b.primary(["doc_id","tag_name"]);
    });
    await knex.schema.createTable("permissions",b=>{
        b.string('username').notNullable();
        b.string("name").notNullable();
        b.primary(["username","name"]);
        b.foreign('username').references('users.username');
    });
    //create admin account.
    await knex.insert({
        username:"admin",
        password_hash:"unchecked",
        password_salt:"unchecked"
    }).into('users');
};

export async function down(knex:Knex) {
    //throw new Error('Downward migrations are not supported. Restore from backup.');
    await knex.schema.dropTable("users");
    await knex.schema.dropTable("document");
    await knex.schema.dropTable("tags");
    await knex.schema.dropTable("document_tag_relation");
    await knex.schema.dropTable("permissions");
};