import { Database } from "bun:sqlite";
import _ from "lodash";
import { Ok, Err, Result, None, Some, Option } from "ts-results-es";
import { z } from "zod";

const db = new Database("lab.sqlite", { strict: true })
initDB();


const boardSchema = z.object({
  id: z.number().nonnegative(),
  name: z.string(),
  room: z.string(),
  ipv4: z.string().ip({ version: "v4" }),
  ipv6: z.string().ip({ version: "v6" }),
  port: z.number().nonnegative(),
  cmdID: z.number().nonnegative()
}).partial({
  ipv6: true,
  cmdID: true
})

export type Board = z.infer<typeof boardSchema>

export function isBoard(obj: any): obj is Board {
  return boardSchema.safeParse(obj).success
}

const userSchema = z.object({
  id: z.number().nonnegative(),
  name: z.string(),
  password: z.string(),
  boardID: z.number(),
}).partial({
  boardID: true,
})

export type User = z.infer<typeof userSchema>

export function isUser(obj: any): obj is User {
  return userSchema.safeParse(obj).success
}


function initDB() {
  const tables = allTables()

  if (!tables.includes("Users")) {
    db.query(`
      CREATE TABLE Users(
        id         INT PRIMARY KEY   NOT NULL,
        name       TEXT              NOT NULL,
        password   TEXT              NOT NULL
      );
    `).run();
  }

  if (!tables.includes("Boards"))
    db.query(`
      CREATE TABLE Boards(
        id         INT PRIMARY KEY   NOT NULL,
        name       TEXT              NOT NULL,
        room       TEXT              NOT NULL,
        ipv4       CHAR(16)          NOT NULL,
        ipv6       CHAR(46)                  ,
        port       INT               NOT NULL
      )
    `).run();
}

export function allTables(): Array<string> {
  const query = db.query(`SELECT name FROM sqlite_master WHERE type='table'`)
  var tables = new Array()
  // Flaten array
  for (const item of query.values()) {
    tables.push(item[0])
  }

  query.finalize()
  return tables
}

export function tableColumnName(table: string): Array<string> {
  const query = db.query(`PRAGMA table_info(${table})`)

  var columnName = new Array()
  for (const column of query.values()) {
    columnName.push(column[1])
  }

  return columnName
}

export function addBoard(board: Board): Result<Board, "Wrong params type"> {
  if (!isBoard(board)) {
    return new Err("Wrong params type")
  }

  if (board.id == 0) {
    const idNum = boardsNum()
    board.id = idNum
  } else {

  }

  const query = db.query(`
    INSERT INTO Boards VALUES 
    (${board.id},
    '${board.name},
    '${board.room}',
    '${board.ipv4}',
    '${typeof board.ipv6 === "undefined" ? "NULL" : board.ipv6}',
    ${board.port});
  `)
  query.run()

  return Ok(board)
}

export function boardsNum(): number {
  const query = db.query(`SELECT COUNT(*) FROM Boards`)
  return query.values()[0][0] as number
}

export function deleteBoard(name?: string): Result<Board, "Wrong Type" | "No such Board">
export function deleteBoard(id?: number): Result<Board, "Wrong Type" | "No such Board">
export function deleteBoard(board?: Board): Result<Board, "Wrong Type" | "No such Board">
export function deleteBoard(arg: any): Result<Board, "Wrong Type" | "No such Board"> {
  let retBoard
  let condition: string
  if (isBoard(arg)) {
    retBoard = arg

  } else if (_.isNumber(arg)) {
    retBoard = findBoard(arg)

  } else if (_.isString(arg)) {
    retBoard = findBoard(arg)

  } else {
    return new Err("Wrong Type")
  }

  const query = db.query(`DELETE FROM Boards WHERE id=${arg.id}`)

  return new Ok(retBoard)
}

export function allBoards() {
  const query = db.query(`SELECT * FROM Boards`)
  const boards = query.all()

  query.finalize()
  return boards
}


export function findBoard(name?: string): Result<Option<Board>, "Wrong type">
export function findBoard(id?: number): Result<Option<Board>, "Wrong type">
export function findBoard(arg: any): Result<Option<Board>, "Wrong type"> {
  let condition: string
  if (_.isNumber(arg)) {
    condition = `arg=${arg}`

  } else if (_.isString(arg)) {
    condition = `name='${arg}'`

  } else {
    return new Err("Wrong type")

  }

  const query = db.query(`SELECT * FROM Boards WHERE ${condition}`)

  const spRet = boardSchema.safeParse(query.get())
  if (spRet.success) {
    return new Ok(Some(spRet.data))
  } else {
    return new Ok(None)
  }
}


export function findUser(name: string): User {
  const query = db.query(`SELECT * FROM Users WHERE name='${name}'`)

  const spRet = userSchema.safeParse(query.get())
  if (spRet.success) {
    return spRet.data
  } else {
    throw new Error(`Failure: Not found ${name} User`)
  }
}