import os
from flask import request, render_template, current_app
from datetime import datetime


def activity_log_controller():
    logs = []
    log_file = os.path.join(current_app.root_path, 'activity.log')

    if os.path.exists(log_file):
        with open(log_file, 'r') as f:
            for line in f:
                parts = line.strip().split(" | ")
                if len(parts) == 4:
                    logs.append({
                        "timestamp": parts[0].replace("Timestamp:", "").strip(),
                        "user": parts[1].replace("User:", "").strip(),
                        "action": parts[2].replace("Action:", "").strip(),
                        "details": parts[3].replace("Details:", "").strip()
                    })

    # Filters
    start_date = request.args.get("start_date")
    end_date = request.args.get("end_date")
    username = request.args.get("username")

    filtered_logs = logs

    # Date filter
    if start_date or end_date:
        try:
            if start_date:
                start_dt = datetime.strptime(start_date, "%Y-%m-%d")
            else:
                start_dt = datetime.min

            if end_date:
                end_dt = datetime.strptime(end_date, "%Y-%m-%d")
            else:
                end_dt = datetime.max

            filtered_logs = [
                log for log in filtered_logs
                if start_dt <= datetime.strptime(
                    log["timestamp"], "%Y-%m-%d %H:%M:%S"
                ) <= end_dt.replace(hour=23, minute=59, second=59)
            ]
        except Exception as e:
            print("Date filter error:", e)

    # Username filter
    if username:
        filtered_logs = [
            log for log in filtered_logs
            if log["user"].lower() == username.lower()
        ]

    return render_template(
        "activity_log.html",
        logs=filtered_logs,
        start_date=start_date,
        end_date=end_date,
        username=username
    )