import pool from "../db"
import { Course, CourseAttendee, CourseEventDetails, RawAttendeeRow } from "@app/shared/types/course"

export async function getAllCourses(): Promise<Course[]> {
    const sql = "SELECT * FROM courses WHERE deleted = false;"

    const res = await pool.query(sql);

    return res;
}

function buildAttendee(row: RawAttendeeRow): CourseAttendee {
    return {
        passed: !!row.passed,
        attendee_id: row.attendee_id,
        course_event_id: row.course_event_id,
        created_at: row.created_at,
        updated_at: row.updated_at,
        remarks: row.remarks,
        attendee_role_id: row.attendee_role_id,
        
        role: row.role_id
            ? {
                id: row.role_id,
                name: row.role_name,
                description: row.role_description,
                deleted: !!row.role_deleted,
                created_at: row.role_created_at,
                updated_at: row.role_updated_at,
            }
            : null
    };
}

export async function getCourseEventAttendees(id: number): Promise<CourseAttendee[]> {
    const sql = `SELECT
                ca.*,
                ar.id AS role_id,
                ar.name AS role_name,
                ar.description AS role_description,
                ar.deleted AS role_deleted,
                ar.created_at AS role_created_at,
                ar.updated_at AS role_updated_at
                FROM course_attendees ca
                LEFT JOIN course_attendee_roles ar ON ar.id = ca.attendee_role_id
                WHERE ca.course_event_id = ?;`;
    
    const res:RawAttendeeRow[] = await pool.query(sql, [id]);
    
    return res.map((row) => buildAttendee(row))
}

export async function getCourseEventDetails(id: number): Promise<CourseEventDetails> {
    const sql = `SELECT * FROM course_events WHERE id = ?;`;
    let rows: CourseEventDetails[] = await pool.query(sql, [id]);
    let event = rows[0];
    event.attendees = await getCourseEventAttendees(id);
    return event;
}