import { BaseSchema } from '@adonisjs/lucid/schema'

/**
 * The par2 merge (REBUILD.md, phase 2; app/services/par2_merger.ts): what the
 * prober read that ties files to a par2 set, and the merges made from it.
 * - file_hashes: per probed article that starts a file, the MD5 of its first 16 KiB and the file's size.
 * - par2_files: per par2 recovery set, every file it describes (FileDesc: the same 16 KiB MD5, length, name).
 * - par2_sets: which releases hold a par2 file of a set.
 * - release_merges: releases merged into another, by set.
 */
export default class extends BaseSchema {
  async up() {
    this.schema.raw(`
      CREATE TABLE file_hashes (
        candidate_id bigint PRIMARY KEY,
        release_id bigint NOT NULL,
        hash16k char(32) NOT NULL,
        size bigint NOT NULL,
        created_at timestamptz NOT NULL DEFAULT now()
      )`)
    this.schema.raw(`CREATE INDEX file_hashes_hash_idx ON file_hashes (hash16k)`)
    this.schema.raw(`CREATE INDEX file_hashes_release_idx ON file_hashes (release_id)`)
    this.schema.raw(`CREATE INDEX file_hashes_created_idx ON file_hashes (created_at)`)
    this.schema.raw(`
      CREATE TABLE par2_files (
        set_id char(32) NOT NULL,
        file_id char(32) NOT NULL,
        hash16k char(32) NOT NULL,
        length bigint NOT NULL,
        name text NOT NULL,
        PRIMARY KEY (set_id, file_id)
      )`)
    this.schema.raw(`CREATE INDEX par2_files_hash_idx ON par2_files (hash16k)`)
    this.schema.raw(`
      CREATE TABLE par2_sets (
        set_id char(32) NOT NULL,
        release_id bigint NOT NULL,
        files integer NOT NULL,
        created_at timestamptz NOT NULL DEFAULT now(),
        PRIMARY KEY (set_id, release_id)
      )`)
    this.schema.raw(`CREATE INDEX par2_sets_release_idx ON par2_sets (release_id)`)
    this.schema.raw(`CREATE INDEX par2_sets_created_idx ON par2_sets (created_at)`)
    this.schema.raw(`
      CREATE TABLE release_merges (
        id bigserial PRIMARY KEY,
        from_id bigint NOT NULL,
        from_key varchar(48) NOT NULL,
        into_id bigint NOT NULL,
        set_id char(32) NOT NULL,
        files integer NOT NULL,
        created_at timestamptz NOT NULL DEFAULT now()
      )`)
    this.schema.raw(`CREATE INDEX release_merges_into_idx ON release_merges (into_id)`)
  }

  async down() {
    this.schema.raw(`DROP TABLE IF EXISTS file_hashes, par2_files, par2_sets, release_merges`)
  }
}