totalLengthOfVideos

#!/bin/bash

# Ensure robust error handling
set -euo pipefail

# Check if required tools are installed
check_dependency() {
    if ! command -v "$1" &> /dev/null; then
        echo "Error: $1 is not installed. Please install it first."
        exit 1
    fi
}

# Check dependencies
check_dependency ffprobe
check_dependency parallel
check_dependency bc

# Get folder path from argument or use current directory
FOLDER_PATH="${1:-.}"

# Validate directory
if [ ! -d "$FOLDER_PATH" ]; then
    echo "Error: Directory '$FOLDER_PATH' does not exist"
    exit 1
fi

# Create and manage temporary file safely
temp_file=$(mktemp)
trap 'rm -f "$temp_file"' EXIT

# Find video files (case-insensitive)
echo "Scanning directory: $(realpath "$FOLDER_PATH")"
echo "Looking for video files"

# Find files with case-insensitive extensions
find "$FOLDER_PATH" \( -iname "*.mp4" -o -iname "*.mkv" -o -iname "*.avi" -o \
                       -iname "*.mov" -o -iname "*.wmv" -o -iname "*.flv" -o \
                       -iname "*.webm" -o -iname "*.m4v" \) > "$temp_file"

# Function to safely get duration of a single file
get_duration() {
    local file="$1"
    local duration=0

    # Use robust error handling for ffprobe
    if duration=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$file" 2>/dev/null); then
        # Validate that duration is a number
        if [[ "$duration" =~ ^[0-9]+([.][0-9]+)?$ ]]; then
            echo "$duration"
        else
            echo "0"
        fi
    else
        echo "0"
    fi
}
export -f get_duration

# Count and validate videos
total_videos=$(wc -l < "$temp_file")
echo "Found $total_videos video file(s)"

# Display first few files if any exist
if [ $total_videos -gt 0 ]; then
    echo "Sample of found files (first 5):"
    head -n 5 "$temp_file"
fi

# Calculate total duration safely
total_seconds=$(parallel -j+0 get_duration < "$temp_file" | awk '{sum += $1} END {print sum+0}')

# Ensure total_seconds is a valid number
total_seconds=${total_seconds:-0}

# Conversion functions with error handling
convert_to_hm() {
    local seconds=$1
    local hours minutes
    
    hours=$(printf "%.0f" "$(echo "$seconds / 3600" | bc)")
    minutes=$(printf "%.0f" "$(echo "($seconds % 3600) / 60" | bc)")
    
    echo "$hours hours $minutes minutes"
}

convert_to_decimal() {
    local seconds=$1
    printf "%.1f" "$(echo "scale=1; $seconds / 3600" | bc)"
}

# Calculate statistics only if videos exist
if [ $total_videos -gt 0 ]; then
    avg_minutes=$(printf "%.1f" "$(echo "scale=1; $total_seconds / $total_videos / 60" | bc)")
else
    avg_minutes="0.0"
fi

# Calculate total duration components
total_hours=$(printf "%.0f" "$(echo "$total_seconds / 3600" | bc)")
remaining_minutes=$(printf "%.0f" "$(echo "($total_seconds % 3600) / 60" | bc)")

# Playback speed calculations
speeds=(1.25 1.50 1.75 2.00)

# Output results
echo "Number of videos: $total_videos"
echo "Average video length: $avg_minutes minutes"
echo "Total playlist length: $total_hours hours $remaining_minutes minutes"

# Dynamic speed calculations
for speed in "${speeds[@]}"; do
    reduced_time=$(convert_to_decimal "$(echo "$total_seconds / $speed" | bc)")
    echo "At ${speed}x: $reduced_time hours"
done