#!/bin/bash

# Histd: how I spent this day.
# A simple but useful personal diary CLI utility.

# Check if a text editor is specified
function _check_editor {
    if [[ $EDITOR == "" ]]; then
        echo EDITOR is undefined
        exit 1
    fi
}

# Create the required directories and open a text editor
# so that the user can describe the day.
function edit_note {
    # Create dirs (base_dir/year/month)
    WORKDIR="$BASE_DIR/$(date +%Y)/$(date +%m)"
    mkdir -p $WORKDIR

    # Generate file name
    PATH_TO_FILE="$WORKDIR/$(date +%d).md"

    # Open editor
    _check_editor
    cd $BASE_DIR
    $EDITOR $PATH_TO_FILE
    cd - > /dev/null
}

# Create an archive with all notes
function backup {
    ARCHIVE_PATH=~/histd-$(date +%F).tar.xz
    cd $BASE_DIR
    tar cfJ $ARCHIVE_PATH ../histd
    cd - > /dev/null

    echo Saved to $ARCHIVE_PATH
}

# Concatenate all files and prefix each with the filename.
# The result will be printed to stdout.
function merge {
    find $BASE_DIR -type f -name "*.md" -exec echo "# {}" \; -exec cat "{}" \; -exec echo \;
}

# Display tree of all notes
function list {
    tree $BASE_DIR
}

# Open last note
function last {
    _check_editor
    LAST_FILE=$(find $BASE_DIR -type f -name "*.md" | tail -1)
    cd $BASE_DIR
    $EDITOR $LAST_FILE
    cd - > /dev/null
}

function help {
    echo "Histd - How I Spent This Day"
    echo "A simple personal diary app"
    echo
    echo "Usage:"
    echo "- histd.sh - open a text editor to describe the current day"
    echo "- histd.sh backup - create an archive of all notes"
    echo "- histd.sh merge - print all notes"
    echo "- histd.sh list - list all notes"
    echo "- histd.sh last - open last note"
    echo "- histd.sh help - show this message"
}

# Prepare the environment
BASE_DIR=~/.local/share/histd
mkdir -p $BASE_DIR

# Parse commands
if [[ $# -eq 0 ]]; then
    edit_note
elif [[ $1 == "backup" ]]; then
    backup
elif [[ $1 == "merge" ]]; then
    merge
elif [[ $1 == "list" ]]; then
    list
elif [[ $1 == "last" ]]; then
    last
elif [[ $1 == "help" ]]; then
    help
else
    echo Command not found
    echo
    help
fi