#!/usr/bin/env bash
# dnes: Daily plan tracker and journal of done things with anti-recursion protection
set -euo pipefail

PLAN_DIR="$HOME/src/dnes"
PLAN_FILE="$PLAN_DIR/plan.md"
JOURNAL_FILE="$PLAN_DIR/journal.md"
LOCK_FILE="/tmp/dnes-sync.lock"
LOG_DIR="$HOME/.local/state/dnes"
mkdir -p "$LOG_DIR"

# Prevent recursive self-invocation
if [ "${DNES_IN_SUBPROCESS:-0}" = "1" ]; then
    echo "Warning: Nested dnes execution detected. Aborting recursion." >&2
    exit 0
fi
export DNES_IN_SUBPROCESS=1

cmd_done() {
    local text="${*:-}"
    if [ -z "$text" ]; then
        echo "Usage: dnes done <description of completed task>" >&2
        exit 1
    fi

    local today
    today=$(date +%Y-%m-%d)
    local time_now
    time_now=$(date +%H:%M)

    # Ensure journal file exists with header
    if [ ! -f "$JOURNAL_FILE" ]; then
        echo "# Journal / Hotovo" > "$JOURNAL_FILE"
        echo "" >> "$JOURNAL_FILE"
    fi

    # Check if today's section exists; if not, create it
    if ! grep -q "^## $today" "$JOURNAL_FILE" 2>/dev/null; then
        echo "" >> "$JOURNAL_FILE"
        echo "## $today" >> "$JOURNAL_FILE"
    fi

    # Append entry under today
    echo "- [$time_now] $text" >> "$JOURNAL_FILE"
    echo "Logged to journal: [$time_now] $text"

    # Trigger Syncthing rescan so peers receive the entry immediately
    local api_key
    api_key=$(grep -oPm1 "(?<=<apikey>)[^<]+" "$HOME/.config/syncthing/config.xml" 2>/dev/null || true)
    if [ -n "$api_key" ]; then
        curl -s -f -X POST -H "X-API-Key: $api_key" "http://127.0.0.1:8384/rest/db/scan?folder=dnes" >/dev/null 2>&1 || true
    fi
}

cmd_cron() {
    exec 200>"$LOCK_FILE"
    if ! flock -n 200; then
        echo "$(date '+%Y-%m-%d %H:%M:%S') - Sync/cron already running. Skipping."
        exit 0
    fi

    echo "$(date '+%Y-%m-%d %H:%M:%S') - Starting 23:45 nightly archive..."
    cd "$PLAN_DIR"

    # Git checkpoint
    git add plan.md journal.md .gitignore .stignore 2>/dev/null || true
    if ! git diff-index --quiet HEAD -- 2>/dev/null; then
        local today
        today=$(date +%Y-%m-%d)
        git commit -m "archive ($today): nightly 23:45 snapshot"
        git push origin main || echo "Warning: git push failed (remote offline or ahead)"
        echo "Nightly Git checkpoint completed."
    else
        echo "No changes to commit."
    fi

    # Trigger Syncthing folder scan to ensure all peers have identical state
    local api_key
    api_key=$(grep -oPm1 "(?<=<apikey>)[^<]+" "$HOME/.config/syncthing/config.xml" 2>/dev/null || true)
    if [ -n "$api_key" ]; then
        curl -s -f -X POST -H "X-API-Key: $api_key" "http://127.0.0.1:8384/rest/db/scan?folder=dnes" >/dev/null 2>&1 || true
    fi
    echo "$(date '+%Y-%m-%d %H:%M:%S') - Nightly archive finished successfully."
}

cmd_view() {
    if [ -f "$PLAN_FILE" ]; then
        cat "$PLAN_FILE"
    fi
    if [ -f "$JOURNAL_FILE" ]; then
        local today
        today=$(date +%Y-%m-%d)
        if grep -q "^## $today" "$JOURNAL_FILE" 2>/dev/null; then
            echo ""
            echo "---"
            echo "### Dnes hotovo ($today):"
            awk "/^## $today/{flag=1; next} /^## /{flag=0} flag" "$JOURNAL_FILE"
        fi
    fi
}

case "${1:-}" in
    done|d|log)
        shift
        cmd_done "$@"
        ;;
    journal|j)
        cat "$JOURNAL_FILE" 2>/dev/null || echo "No journal.md found"
        ;;
    plan|p)
        cat "$PLAN_FILE" 2>/dev/null || echo "No plan.md found"
        ;;
    edit|e)
        ${EDITOR:-vim} "$PLAN_FILE"
        ;;
    edit-journal|ej)
        ${EDITOR:-vim} "$JOURNAL_FILE"
        ;;
    status|sync)
        if command -v sync-scope >/dev/null 2>&1; then
            sync-scope status
        elif [ -x "$HOME/bin/sync-scope" ]; then
            "$HOME/bin/sync-scope" status
        fi
        ;;
    cron)
        cmd_cron
        ;;
    git|commit)
        shift || true
        MSG="${*:-dnes update $(date +%s)}"
        cd "$PLAN_DIR"
        git add plan.md journal.md .gitignore .stignore 2>/dev/null || true
        if ! git diff-index --quiet HEAD -- 2>/dev/null; then
            git commit -m "$MSG"
            git push origin main
            echo "Git checkpoint pushed."
        else
            echo "Working tree clean. Nothing to commit."
        fi
        ;;
    help|-h|--help)
        echo "dnes - Daily plan tracker & journal of done things"
        echo ""
        echo "Usage: dnes [command]"
        echo ""
        echo "Commands:"
        echo "  (no args)           Show plan & today's completed journal items"
        echo "  done <text>         Log completed task to journal.md with timestamp"
        echo "  journal, j          Display complete journal.md"
        echo "  plan, p             Display plan.md"
        echo "  edit, e             Edit plan.md in \$EDITOR"
        echo "  edit-journal, ej    Edit journal.md in \$EDITOR"
        echo "  status              Show multi-device sync status"
        echo "  git [msg]           Save manual Git commit checkpoint & push"
        echo "  cron                Run nightly 23:45 archive routine"
        ;;
    *)
        cmd_view
        ;;
esac