timezone

#!/bin/sh
# POSIX-compatible timezone table with current-hour highlight
# Usage: ./timezone.sh [--select|-s] for dmenu selection

# === Configuration ===
MY_TZ="America/Sao_Paulo"  # your timezone
PEOPLE_FILE="$HOME/.scripts/.env/people"
START_HOUR=8
END_HOUR=19

# === Functions ===

# Load people data from .env/people file
load_people_data() {
    if [ ! -f "$PEOPLE_FILE" ]; then
        echo "Error: People configuration file not found: $PEOPLE_FILE" >&2
        echo "Please create $PEOPLE_FILE with people data in format: Name|Timezone" >&2
        return 1
    fi

    if [ ! -r "$PEOPLE_FILE" ]; then
        echo "Error: Cannot read people configuration file: $PEOPLE_FILE" >&2
        return 1
    fi

    # Read the file and substitute MY_TZ variable
    while IFS= read -r line; do
        # Skip empty lines and comments
        [ -z "$line" ] && continue
        [ "${line#\#}" != "$line" ] && continue

        # Replace MY_TZ placeholder with actual timezone
        echo "$line" | sed "s|MY_TZ|$MY_TZ|g"
    done < "$PEOPLE_FILE"
}

# Extract people names from people data
extract_people_names() {
    people_data="$1"
    echo "$people_data" | while IFS='|' read -r nm tz; do
        [ -z "$nm" ] && continue
        printf '%s\n' "$nm"
    done
}

# Select people using dmenu
select_people_with_dmenu() {
    people_data="$1"

    # Check if dmenu is available
    if ! command -v dmenu >/dev/null 2>&1; then
        echo "Error: dmenu is not installed or not in PATH" >&2
        return 1
    fi

    # Extract names and create dmenu list
    names=$(extract_people_names "$people_data")
    if [ -z "$names" ]; then
        echo "Error: No people found in configuration" >&2
        return 1
    fi

    # Use dmenu with multi-selection
    selected=$(echo "$names" | dmenu -l 10 -p "Select people (Ctrl+Enter to confirm):")

    # If no selection made, return empty
    [ -z "$selected" ] && return 0

    # Return selected names (one per line)
    echo "$selected"
}

# Filter people data based on selected names
filter_people_by_selection() {
    people_data="$1"
    selected_names="$2"
    [ -z "$selected_names" ] && return 0

    echo "$people_data" | while IFS='|' read -r name tz; do
        [ -z "$name" ] && continue
        # Check if this name is in the selected list
        echo "$selected_names" | while IFS= read -r selected; do
            [ "$name" = "$selected" ] && printf '%s|%s\n' "$name" "$tz"
        done
    done
}

# Display timezone table for given people data
display_timezone_table() {
    people_data="$1"

    # === Layout settings ===
    TIME_W=7
    MIN_NAME_W=8
    PADDING=2

    # === Colors ===
    # ANSI escape codes (disable with NO_COLOR=1 if needed)
    if [ -z "$NO_COLOR" ]; then
        BOLD="$(printf '\033[1m')"
        RESET="$(printf '\033[0m')"
        REVERSE="$(printf '\033[7m')"  # inverse colors
    else
        BOLD=""; RESET=""; REVERSE=""
    fi

    # === Determine widths ===
    max_name=0
    echo "$people_data" | while IFS='|' read -r nm tz; do
        [ -z "$nm" ] && continue
        printf '%s\n' "$nm"
    done > /tmp/.tz_names.$$

    while IFS= read -r name; do
        len=${#name}
        [ "$len" -gt "$max_name" ] && max_name=$len
    done < /tmp/.tz_names.$$ 2>/dev/null
    rm -f /tmp/.tz_names.$$ 2>/dev/null

    name_w=$max_name
    [ "$name_w" -lt "$MIN_NAME_W" ] && name_w=$MIN_NAME_W
    name_w=$((name_w + PADDING))

    # === Header ===
    CURRENT_TIME=$(date "+%R")
    printf "Current time: %s\n\n" "$CURRENT_TIME"
    printf "%-${name_w}s" "Name"
    hour=$START_HOUR
    while [ "$hour" -le "$END_HOUR" ]; do
        label=$(printf "%02d:00" "$hour")
        printf "%*s" "$TIME_W" "$label"
        hour=$((hour + 1))
    done
    printf "\n"

    # Separator
    total_w=$((name_w + (END_HOUR - START_HOUR + 1) * TIME_W))
    i=0; while [ "$i" -lt "$total_w" ]; do printf '-'; i=$((i + 1)); done; printf "\n"

    # === Current hour (your local time) ===
    current_hour=$(TZ="$MY_TZ" date +%H | sed 's/^0//')
    today=$(TZ="$MY_TZ" date +%Y-%m-%d)

    # === Table content ===
    echo "$people_data" | while IFS="|" read -r name tz; do
        [ -z "$name" ] && continue
        printf "%-${name_w}s" "$name"

        hour=$START_HOUR
        while [ "$hour" -le "$END_HOUR" ]; do
            ts=$(TZ="$MY_TZ" date -d "$today $hour:00" +%s)
            tstr=$(TZ="$tz" date -d "@$ts" +%H:%M 2>/dev/null)
            [ -z "$tstr" ] && tstr="--:--"

            # Highlight column if this is the current local hour
            if [ "$hour" -eq "$current_hour" ]; then
                printf "%s%*s%s" "$REVERSE" "$TIME_W" "$tstr" "$RESET"
            else
                printf "%*s" "$TIME_W" "$tstr"
            fi
            hour=$((hour + 1))
        done
        printf "\n"
    done
}

# === Main script logic ===

# Load people data from configuration file
PEOPLE=$(load_people_data)
if [ $? -ne 0 ]; then
    exit 1
fi

# Check if we have any people data
if [ -z "$PEOPLE" ]; then
    echo "Error: No people data found in configuration file" >&2
    exit 1
fi

# Check command line arguments
if [ "$1" = "--select" ] || [ "$1" = "-s" ]; then
    # Use dmenu selection
    selected_names=$(select_people_with_dmenu "$PEOPLE")
    if [ $? -ne 0 ]; then
        exit 1
    fi

    if [ -z "$selected_names" ]; then
        echo "No people selected. Exiting."
        exit 0
    fi

    # Filter people data based on selection
    filtered_people=$(filter_people_by_selection "$PEOPLE" "$selected_names")
    if [ -z "$filtered_people" ]; then
        echo "No matching people found. Exiting."
        exit 0
    fi

    # Display table with selected people
    display_timezone_table "$filtered_people"
else
    # Display all people (original behavior)
    display_timezone_table "$PEOPLE"
fi