import {
  createNote,
  createUser,
  initDatabaseConnectionPool,
  queryArray,
} from "@/db/mod.ts";
import { reload } from "@/config.ts";
import { log, setupLoggers } from "@/log.ts";

const [config, configLoadLogCallbacks] = reload();
setupLoggers(config.log);

for (const f of configLoadLogCallbacks) {
  f(log);
}

initDatabaseConnectionPool(config.postgres);

const id = "id uuid primary key default generate_ulid()";

interface TableSpec {
  columns: string[];
  additionalTableStatements?: string[];
  additionalStatements?: string[];
  prepStatements?: string[];
}

const createdAtTimestamp = "created_at timestamptz not null default now()";
const updatedAtTimestamp = "updated_at timestamptz not null default now()";

const timestamps = [createdAtTimestamp, updatedAtTimestamp];

const extensions = [
  "uuid-ossp",
  "pgcrypto",
];

const functions = [
  `
  create or replace function generate_ulid() returns uuid
      as $$
          select (lpad(to_hex(floor(extract(epoch from clock_timestamp()) * 1000)::bigint), 12, '0') || encode(gen_random_bytes(10), 'hex'))::uuid;
      $$ language sql
  `,
];

const tables: Record<string, TableSpec> = {
  "user": {
    columns: [
      id,
      "username text not null unique",
      "password_digest text not null",
      "display_name text",
      ...timestamps,
    ],
    additionalTableStatements: [
      "constraint valid_username check (username ~* '^[a-z\\d\\-_]{2,38}$')",
    ],
  },
  "token": {
    columns: [
      "digest bytea not null unique",
      "user_id uuid not null",
      "data jsonb",
      createdAtTimestamp,
    ],
    additionalStatements: [
      "create index team_data_type on token using hash ((data->'type'))",
    ],
    additionalTableStatements: [
      'constraint fk_user foreign key(user_id) references "user"(id) on delete cascade',
    ],
  },
  "team": {
    columns: [
      id,
      "display_name text not null",
      ...timestamps,
    ],
    additionalStatements: [
      'create index display_name_idx on team ("display_name")',
    ],
  },
  "team_user": {
    prepStatements: [
      "drop type if exists team_user_status",
      "create type team_user_status as enum ('invited', 'accepted', 'manager', 'owner', 'removed', 'left')",
    ],
    columns: [
      "team_id uuid",
      "user_id uuid",
      "status team_user_status not null",
      ...timestamps,
    ],
    additionalTableStatements: [
      'constraint fk_team foreign key(team_id) references "team"(id) on delete cascade',
      'constraint fk_user foreign key(user_id) references "user"(id) on delete cascade',
    ],
    additionalStatements: [
      "create index team_user_idx on team_user (team_id) include (user_id)",
      "create index team_idx on team_user (team_id)",
      "create index user_idx on team_user (user_id)",
      "create index status_idx on team_user (status)",
    ],
  },
  "note": {
    columns: [
      id,
      "user_id uuid default null",
      "content text not null",
      ...timestamps,
    ],
    additionalTableStatements: [
      'constraint fk_user foreign key(user_id) references "user"(id) on delete cascade',
    ],
  },
  "playlist": {
    columns: [
      id,
      "display_name text not null",
      "team_id uuid not null",
      ...timestamps,
    ],
    additionalTableStatements: [
      'constraint fk_team foreign key(team_id) references "team"(id) on delete cascade',
    ],
  },
  "display": {
    columns: [
      id,
      "display_name text default null",
      "team_id uuid not null",
      "is_frozen boolean default false",
      "is_blanked boolean default false",
      "playlist_id uuid not null",
      "current_song_index integer default 0",
      "current_verse_index integer default 0",
      ...timestamps,
    ],
    additionalTableStatements: [
      // TODO: index timestamps?
      'constraint fk_playlist foreign key(playlist_id) references "playlist"(id) on delete cascade',
    ],
  },
  "song": {
    columns: [
      id,
      "team_id uuid not null",
      ...timestamps,
    ],
    additionalTableStatements: [
      // TODO: index timestamps?
      'constraint fk_team foreign key(team_id) references "team"(id) on delete cascade',
    ],
  },
  "verse": {
    columns: [
      id,
      "display_name text default null",
      "content text not null default ''",
      "song_id uuid not null",
      ...timestamps,
    ],
    additionalTableStatements: [
      'constraint fk_song foreign key(song_id) references "song"(id) on delete cascade',
    ],
  },
  "map": {
    columns: [
      id,
      "display_name text not null",
      "song_id uuid not null",
      ...timestamps,
    ],
    additionalTableStatements: [
      'constraint fk_song foreign key(song_id) references "song"(id) on delete cascade',
    ],
  },
  "map_verse": {
    columns: [
      "map_id uuid",
      "verse_id uuid",
      '"index" integer not null',
      ...timestamps,
    ],
    additionalTableStatements: [
      // TODO: is there a way to enforce that both of these must have the same song_id?
      'constraint fk_map foreign key(map_id) references "map"(id) on delete cascade',
      'constraint fk_song foreign key(verse_id) references "verse"(id) on delete cascade',
    ],
    additionalStatements: [
      'create index map_verse_idx on "map_verse" (map_id) include (verse_id)',
      'create index map_idx on "map_verse" (map_id)',
      'create index verse_idx on "map_verse" (verse_id)',
      'create unique index map_index_idx on "map_verse" (map_id) include ("index")',
    ],
  },
  "playlist_song": {
    columns: [
      "playlist_id uuid",
      "song_id uuid",
      "map_id uuid",
      '"index" integer not null',
      ...timestamps,
    ],
    additionalTableStatements: [
      // TODO: is there a way to enforce that playlist and song have the same team_id?
      // TODO: is there a way to enforce that map.song_id is the same as song.id?
      // TODO: if the map is deleted, do we really want to cascade it across playlists?
      'constraint fk_playlist foreign key(playlist_id) references "playlist"(id) on delete cascade',
      'constraint fk_song foreign key(song_id) references "song"(id) on delete cascade',
      'constraint fk_map foreign key(map_id) references "map"(id) on delete cascade',
    ],
    additionalStatements: [
      'create index playlist_song_idx on "playlist_song" (playlist_id) include (song_id)',
      'create index playlist_idx on "playlist_song" (playlist_id)',
      'create index song_idx on "playlist_song" (song_id)',
      'create unique index playlist_index_idx on "playlist_song" (playlist_id) include ("index")',
    ],
  },
};

const createExtensions = extensions.map((s) =>
  `create extension if not exists "${s.trim()}";`
).join("\n");

const createFunctions = functions.map((s) => s.trim() + ";").join("\n");

const dropTables = Object.entries(tables).reverse().map(([name, _meta]) =>
  `drop table if exists "${name.trim()}";`
).join("\n");

const createTables = Object.entries(tables).map(([rawName, meta]) => {
  const name = rawName.trim();
  return `
-- CREATE TABLE ${name}
${(meta.prepStatements || []).map((s) => `${s.trim()};`).join("\n")}
create table "${name}" (
  ${
    meta.columns.concat(meta.additionalTableStatements || []).map((s) =>
      s.trim()
    ).join(",\n  ")
  }
);
${(meta.additionalStatements || []).map((s) => `${s.trim()};`).join("\n")}
`;
}).map((s) => s.trim()).join("\n\n");

const cleanupQuery = `
begin;

${dropTables}

commit;
`;

console.log(cleanupQuery);

try {
  const setupResult = await queryArray(cleanupQuery);
  console.debug(setupResult);
} catch (err) {
  console.log("Failed to run migration cleanup query:", { ...err });
  throw err;
}

const queryString = `

${createExtensions}

${createFunctions}

${createTables}

commit;
`;

console.log(queryString);

try {
  const setupResult = await queryArray(queryString);
  console.debug(setupResult);
} catch (err) {
  console.log("Failed to run migration setup query:", { ...err });
  throw err;
}

try {
  const [note, user] = await Promise.all([
    createNote({ userId: null, content: "Hello, notes!" }),
    createUser({
      username: "lytedev",
      passwordDigest:
        "$2a$10$9fyDAOz6H4a393KHyjbvIe1WFxbhCJhq/CZmlXcEg4d1bE9Ey25WW",
    }),
  ]);
  console.debug({ note, user });
} catch (err) {
  console.log("Failed to run seed database:", { ...err });
  throw err;
}