import pool from "../../db";
import { logger } from "./logger";

export type AuditArea = 'member' | 'calendar' | 'roles' | 'auth' | 'leave_of_absence' | 'application' | 'course';

export interface AuditContext {
    actorId: number;       // The person doing the action (created_by)
    targetId?: number;     // The ID of the thing being changed (target_id)
}

class AuditLogger {
    async record(
        area: AuditArea,
        action: string,
        context: AuditContext,
        data: Record<string, any> = {} // Already optional with default {}
    ) {
        const actionType = `${area}.${action}`;

        try {
            await pool.query(
                `INSERT INTO audit_log (action_type, payload, target_id, created_by) 
                 VALUES (?, ?, ?, ?)`, // Fixed: removed extra comma/placeholder
                [
                    actionType,
                    JSON.stringify(data),
                    context.targetId || null,
                    context.actorId,
                ]
            );
        } catch (err) {
            logger.error('audit', `AUDIT_FAILURE: Failed to log ${actionType}`, { error: err });
        }
    }
    
    member(action: 'update_rank'| 'update_unit' | 'suspension_added' | 'suspension_removed' | 'discharged', context: AuditContext, data: any = {}) {
        return this.record('member', action, context, data);
    }

    roles(action: 'add_member' | 'remove_member' | 'create' | 'delete', context: AuditContext, data: any = {}) {
        return this.record('roles', action, context, data);
    }

    leaveOfAbsence(action: 'created' | 'admin_created' | 'ended' | 'admin_ended' | 'extended', context: AuditContext, data: any = {}) {
        return this.record('leave_of_absence', action, context, data);
    }

    calendar(action: 'event_created' | 'event_updated' | 'attendance_set' | 'cancelled' | 'un-cancelled', context: AuditContext, data: any = {}) {
        return this.record('calendar', action, context, data);
    }

    application(action: 'created' | 'approved' | 'denied' | 'restarted', context: AuditContext, data: any = {}) {
        return this.record('application', action, context, data);
    }

    course(action: 'report_created' | 'report_edited', context: AuditContext, data: any = {}) {
        return this.record('course', action, context, data);
    }
}

export const audit = new AuditLogger();