#!/bin/bash
# Automatic log file redirection for build scripts
#
# Source this at the top of build scripts to redirect all output to a log file.
# Uses self-re-exec pattern: the script re-launches itself with external redirection,
# which reliably captures ALL output including docker compose TTY output.
#
# Detection logic:
# - If KICAD_LOG_NESTED=1 (re-exec'd or nested call) → output normally
# - If inside Docker (/workspace exists) → output normally
# - Otherwise → re-exec with output redirected to logs/<script>/<timestamp>.log

# Skip if already logging (re-exec'd or nested call)
if [[ "${KICAD_LOG_NESTED:-0}" == "1" ]]; then
    return 0 2>/dev/null || exit 0
fi

# Skip if inside Docker container
if [[ -d "/workspace" ]]; then
    return 0 2>/dev/null || exit 0
fi

# Get the calling script's absolute path
_CALLER_DIR="$(cd "$(dirname "${BASH_SOURCE[1]}")" && pwd)"
_CALLER_SCRIPT="${_CALLER_DIR}/$(basename "${BASH_SOURCE[1]}")"
_SCRIPT_NAME="$(basename "${_CALLER_SCRIPT}" .sh)"

# Find project root (walk up looking for .git)
_PROJECT_ROOT="${_CALLER_DIR}"
while [[ ! -e "${_PROJECT_ROOT}/.git" ]] && [[ "${_PROJECT_ROOT}" != "/" ]]; do
    _PROJECT_ROOT="$(dirname "${_PROJECT_ROOT}")"
done

# Set up log file
_LOGS_DIR="${_PROJECT_ROOT}/logs/${_SCRIPT_NAME}"
_TIMESTAMP="$(date +%Y%m%d-%H%M%S)"
_LOG_FILE="${_LOGS_DIR}/${_TIMESTAMP}.log"

mkdir -p "${_LOGS_DIR}"

# Optionally drive the live progress dashboard in this terminal (the re-exec'd build
# below has its stdout redirected to the log, so THIS process — which still owns the
# TTY — is the one that can paint it). Opt-in: a build script sets KICAD_MONITOR=1
# before sourcing this file. Skipped for non-interactive stdout or KICAD_NO_MONITOR=1.
_MONITOR="${_PROJECT_ROOT}/scripts/build-monitor.sh"
_USE_MONITOR=0
if [[ "${KICAD_MONITOR:-0}" == "1" ]] && [[ -z "${KICAD_NO_MONITOR:-}" ]] \
   && [[ -t 1 ]] && [[ -x "${_MONITOR}" ]]; then
    _USE_MONITOR=1
fi

# Show log path before re-exec
echo "Logging to: ${_LOG_FILE}"
# Only suggest the manual command when we're NOT auto-launching the dashboard.
[[ ${_USE_MONITOR} -eq 0 ]] && \
    echo "Watch progress: ${_MONITOR} --dir ${_SCRIPT_NAME}"

# Run the calling script with output redirected
# This is equivalent to: ./script.sh > logfile 2>&1
# and reliably captures ALL output including docker compose TTY messages
export KICAD_LOG_NESTED=1
export KICAD_LOG_FILE="${_LOG_FILE}"   # let the build body know its own log path

if [[ ${_USE_MONITOR} -eq 1 ]]; then
    : > "${_LOG_FILE}"                            # create now so the follower has a file
    "${_MONITOR}" "${_LOG_FILE}" &                # live dashboard on this terminal
    _MON_PID=$!
    # Tear down the dashboard if the user interrupts the build.
    trap 'kill ${_MON_PID} 2>/dev/null' INT TERM
    "${_CALLER_SCRIPT}" "$@" >> "${_LOG_FILE}" 2>&1
    _EXIT_CODE=$?
    # The build body's EXIT trap writes the done/failed marker, so the monitor paints
    # its final frame in place and self-exits — no separate redraw needed (which would
    # otherwise print the frame a second time).
    wait "${_MON_PID}" 2>/dev/null
    trap - INT TERM
else
    "${_CALLER_SCRIPT}" "$@" > "${_LOG_FILE}" 2>&1
    _EXIT_CODE=$?
fi

# Print completion message (this runs AFTER the script finishes)
if [[ ${_EXIT_CODE} -eq 0 ]]; then
    echo "Done. Log: ${_LOG_FILE}"
else
    echo "Failed (exit ${_EXIT_CODE}). Log: ${_LOG_FILE}"
fi

exit ${_EXIT_CODE}