#!/bin/bash
set -euo pipefail

KUGETSU_DIR="${KUGETSU_DIR:-$HOME/.kugetsu}"
BIN_DIR="$KUGETSU_DIR/bin"

echo "Installing kugetsu to $KUGETSU_DIR..."

mkdir -p "$BIN_DIR"

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

cp "$SCRIPT_DIR/kugetsu" "$BIN_DIR/kugetsu"
chmod +x "$BIN_DIR/kugetsu"

add_to_shell() {
    local rc_file="$1"
    local export_line="export PATH=\"\$HOME/.kugetsu/bin:\$PATH\""
    
    if [ -f "$rc_file" ]; then
        if grep -q "$export_line" "$rc_file" 2>/dev/null; then
            echo "$rc_file already has kugetsu in PATH"
        else
            echo "" >> "$rc_file"
            echo "# kugetsu - opencode session manager" >> "$rc_file"
            echo "$export_line" >> "$rc_file"
            echo "Added to $rc_file"
        fi
    else
        echo "" >> "$rc_file"
        echo "# kugetsu - opencode session manager" >> "$rc_file"
        echo "$export_line" >> "$rc_file"
        echo "Created $rc_file with kugetsu PATH"
    fi
}

add_to_shell "$HOME/.bashrc"
add_to_shell "$HOME/.zshrc"

echo ""
echo "Installation complete!"
echo ""
echo "Run this to start using kugetsu immediately:"
echo "    export PATH=\"\$HOME/.kugetsu/bin:\$PATH\""
echo ""
echo "Or start a new shell."
echo ""
echo "Usage:"
echo "    kugetsu init                           Initialize base session (requires TTY)"
echo "    kugetsu start <issue-ref> <message>    Start task for issue"
echo "    kugetsu continue <issue-ref> [msg]     Continue existing task"
echo "    kugetsu list                           List all sessions"
echo "    kugetsu prune [--force]                Remove orphaned sessions"
echo "    kugetsu destroy <issue-ref> [-y]       Delete session for issue"
echo "    kugetsu destroy --base [-y]            Delete base session"
echo "    kugetsu help                           Show help"
echo ""
echo "Issue ref format: instance/user/repo#number"
echo "Example: github.com/shoko/kugetsu#14"