import { DataSource, ViewColumn, ViewEntity } from "typeorm";
import { membership } from "../entity/club/member/membership";
import { DB_TYPE } from "../env.defaults";

let durationInDays: string;
let durationInYears: string;
let exactDuration: string;
if (DB_TYPE == "postgres") {
  durationInDays = `SUM(COALESCE("membership"."end", CURRENT_DATE) - "membership"."start") `;
  durationInYears = `SUM(EXTRACT(YEAR FROM CURRENT_DATE) - EXTRACT(YEAR FROM member.birthdate))`;
  exactDuration = `SUM(AGE(COALESCE("membership"."end", CURRENT_DATE), "membership"."start"))`;
} else if (DB_TYPE == "mysql") {
  durationInDays = `SUM(DATEDIFF(COALESCE(membership.end, CURDATE()), membership.start))`;
  durationInYears = `SUM(TIMESTAMPDIFF(YEAR, membership.start, COALESCE(membership.end, CURDATE())))`;
  exactDuration = `
    CONCAT(
      SUM(FLOOR(TIMESTAMPDIFF(DAY, membership.start, COALESCE(membership.end, CURDATE())) / 365.25)),
      ' years ',
      SUM(FLOOR(MOD(TIMESTAMPDIFF(MONTH, membership.start, COALESCE(membership.end, CURDATE())), 12))),
      ' months ',
      SUM(FLOOR(MOD(TIMESTAMPDIFF(DAY, membership.start, COALESCE(membership.end, CURDATE())), 30))),
      ' days'
    )
  `;
} else if (DB_TYPE == "sqlite") {
  durationInDays = `SUM(JULIANDAY(COALESCE(membership.end, DATE('now'))) - JULIANDAY(membership.start))`;
  durationInYears = `SUM(FLOOR((JULIANDAY(COALESCE(membership.end, DATE('now'))) - JULIANDAY(membership.start)) / 365.25))`;
  exactDuration = `
    SUM((strftime('%Y', COALESCE(membership.end, DATE('now'))) - strftime('%Y', membership.start))) || ' years ' ||
      SUM((strftime('%m', COALESCE(membership.end, DATE('now'))) - strftime('%m', membership.start))) || ' months ' ||
      SUM((strftime('%d', COALESCE(membership.end, DATE('now'))) - strftime('%d', membership.start))) || ' days'
  `;
}

@ViewEntity({
  expression: (datasource: DataSource) =>
    datasource
      .getRepository(membership)
      .createQueryBuilder("membership")
      .select("status.id", "statusId")
      .addSelect("status.status", "status")
      .addSelect("member.id", "memberId")
      .addSelect("member.firstname", "memberFirstname")
      .addSelect("member.lastname", "memberLastname")
      .addSelect("member.nameaffix", "memberNameaffix")
      .addSelect("member.birthdate", "memberBirthdate")
      .addSelect("salutation.salutation", "memberSalutation")
      .addSelect(durationInDays, "durationInDays")
      .addSelect(durationInYears, "durationInYears")
      .addSelect(exactDuration, "exactDuration")
      .leftJoin("membership.status", "status")
      .leftJoin("membership.member", "member")
      .leftJoin("member.salutation", "salutation")
      .groupBy("status.id")
      .addGroupBy("member.id")
      .addGroupBy("salutation.id"),
})
export class membershipView {
  @ViewColumn()
  durationInDays: number;

  @ViewColumn()
  durationInYears: number;

  @ViewColumn()
  exactDuration: string;

  @ViewColumn()
  status: string;

  @ViewColumn()
  statusId: number;

  @ViewColumn()
  memberId: string;

  @ViewColumn()
  memberSalutation: string;

  @ViewColumn()
  memberFirstname: string;

  @ViewColumn()
  memberLastname: string;

  @ViewColumn()
  memberNameaffix: string;

  @ViewColumn()
  memberBirthdate: Date;
}