#!/bin/bash
# Get Claude session info for a tmux session
# Extracts session ID, branch, and summary directly from Claude's data

TMUX_SESSION="$1"
if [ -z "$TMUX_SESSION" ]; then
    echo "Usage: $0 <tmux-session-name>"
    exit 1
fi

# 1. Get the TTY for this tmux session
TTY=$(tmux list-panes -t "$TMUX_SESSION" -F '#{pane_tty}' 2>/dev/null | head -1)
if [ -z "$TTY" ]; then
    echo "error: tmux session '$TMUX_SESSION' not found"
    exit 1
fi

# 2. Find the Claude PID running on that TTY
TTY_SHORT="${TTY#/dev/}"
CLAUDE_PID=$(ps -eo pid,tty,comm 2>/dev/null | awk -v tty="$TTY_SHORT" '$2 == tty && $3 == "claude" {print $1; exit}')
if [ -z "$CLAUDE_PID" ]; then
    echo "error: no claude process on $TTY"
    exit 1
fi

# 3. Get the working directory of that process
CWD=$(lsof -p "$CLAUDE_PID" 2>/dev/null | awk '$4 == "cwd" {print $NF}')

# 4. Get current git branch from that directory
BRANCH=$(git -C "$CWD" rev-parse --abbrev-ref HEAD 2>/dev/null || echo "unknown")

# 5. Convert to Claude's project path format and find active session
PROJECT_PATH=$(echo "$CWD" | tr '/.' '--')
PROJECT_DIR="$HOME/.claude/projects/$PROJECT_PATH"

if [ ! -d "$PROJECT_DIR" ]; then
    echo "session_id: unknown"
    echo "branch: $BRANCH"
    echo "summary: (no claude project found)"
    exit 0
fi

# 6. Find the most recently modified session file
ACTIVE_SESSION_FILE=$(ls -t "$PROJECT_DIR"/*.jsonl 2>/dev/null | grep -v "agent-" | head -1)
if [ -z "$ACTIVE_SESSION_FILE" ]; then
    echo "session_id: unknown"
    echo "branch: $BRANCH"
    echo "summary: (no session file)"
    exit 0
fi

SESSION_ID=$(basename "$ACTIVE_SESSION_FILE" .jsonl)

# 7. Extract the most recent summary from the session file
SUMMARY=$(grep '"type":"summary"' "$ACTIVE_SESSION_FILE" 2>/dev/null | tail -1 | jq -r '.summary // empty')
if [ -z "$SUMMARY" ]; then
    # Fall back to first user message
    SUMMARY=$(grep '"type":"user"' "$ACTIVE_SESSION_FILE" 2>/dev/null | head -1 | jq -r '.message.content' 2>/dev/null | head -c 80)
fi

echo "session_id: $SESSION_ID"
echo "branch: $BRANCH"
echo "summary: ${SUMMARY:-"(no summary)"}"