#!/usr/bin/env bash

year=$(date +%Y)
week_number=$(date +%W)

weekly_journal_title="# Week $week_number $year"
weekly_journal_subtitle="## $(date '+%Y-%m-%d %A')"

monthly_journal_title="# $(date '+%B %Y')"
monthly_journal_subtitle="## [Week $week_number $year](week$week_number.md)"

weekly_journal="$WD_JOURNALS_DIR/$year/week$week_number.md"
monthly_journal="$WD_JOURNALS_DIR/$year/$(date '+%Y-%m').md"

# Open weekly journal by default.
# TODO: maybe I can add a environment variable on it.
file_to_edit="$weekly_journal"

init_journal_with_title () {
    local filepath=$1
    local journal_title=$2

    [ ! -f "$filepath" ] && echo "$journal_title" > "$filepath"
}

append_line_if_not_in_file () {
    local filepath=$1
    local line=$2

    if ! grep -q "$line" "$filepath"; then
        echo "$line" >> "$filepath"
    fi
}

init_weekly_journal () {
    init_journal_with_title "$weekly_journal" "$weekly_journal_title"

    append_line_if_not_in_file "$weekly_journal" "$weekly_journal_subtitle"
}

init_monthly_journal () {
    init_journal_with_title "$monthly_journal" "$monthly_journal_title"

    append_line_if_not_in_file "$monthly_journal" "$monthly_journal_subtitle"
}

case "$1" in
    --monthly|-m) shift; init_monthly_journal; file_to_edit="$monthly_journal";;
    --weekly|-w) shift; init_weekly_journal; file_to_edit="$weekly_journal";;
esac

$EDITOR "$file_to_edit"