#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ROOT_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"
DIST_DIR="${DIST_DIR:-${ROOT_DIR}/dist}"
BUILD_DIR="${BUILD_DIR:-${ROOT_DIR}/build}"
APP_NAME="aman"

mkdir -p "${DIST_DIR}" "${BUILD_DIR}"

require_command() {
  local cmd="$1"
  if command -v "${cmd}" >/dev/null 2>&1; then
    return
  fi
  echo "missing required command: ${cmd}" >&2
  exit 1
}

project_version() {
  require_command python3
python3 - <<'PY'
from pathlib import Path
import re

text = Path("pyproject.toml").read_text(encoding="utf-8")
match = re.search(r'(?m)^version\s*=\s*"([^"]+)"\s*$', text)
if not match:
    raise SystemExit("project version not found in pyproject.toml")
print(match.group(1))
PY
}

project_name() {
  require_command python3
  python3 - <<'PY'
from pathlib import Path
import re

text = Path("pyproject.toml").read_text(encoding="utf-8")
match = re.search(r'(?m)^name\s*=\s*"([^"]+)"\s*$', text)
if not match:
    raise SystemExit("project name not found in pyproject.toml")
print(match.group(1))
PY
}

build_wheel() {
  require_command python3
  rm -rf "${ROOT_DIR}/build"
  rm -rf "${BUILD_DIR}"
  rm -rf "${ROOT_DIR}/src/${APP_NAME}.egg-info"
  mkdir -p "${DIST_DIR}" "${BUILD_DIR}"
  python3 -m build --wheel --no-isolation --outdir "${DIST_DIR}"
}

latest_wheel_path() {
  require_command python3
  python3 - <<'PY'
import os
from pathlib import Path
import re

text = Path("pyproject.toml").read_text(encoding="utf-8")
name_match = re.search(r'(?m)^name\s*=\s*"([^"]+)"\s*$', text)
version_match = re.search(r'(?m)^version\s*=\s*"([^"]+)"\s*$', text)
if not name_match or not version_match:
    raise SystemExit("project metadata not found in pyproject.toml")
name = name_match.group(1).replace("-", "_")
version = version_match.group(1)
dist_dir = Path(os.environ.get("DIST_DIR", "dist"))
candidates = sorted(dist_dir.glob(f"{name}-{version}-*.whl"))
if not candidates:
    raise SystemExit(f"no wheel artifact found in {dist_dir.resolve()}")
print(candidates[-1])
PY
}

render_template() {
  local template_path="$1"
  local output_path="$2"
  shift 2
  cp "${template_path}" "${output_path}"
  for mapping in "$@"; do
    local key="${mapping%%=*}"
    local value="${mapping#*=}"
    sed -i "s|__${key}__|${value}|g" "${output_path}"
  done
}

write_runtime_requirements() {
  local output_path="$1"
  require_command python3
  python3 - "${output_path}" <<'PY'
import ast
from pathlib import Path
import re
import sys

output_path = Path(sys.argv[1])
text = Path("pyproject.toml").read_text(encoding="utf-8")
match = re.search(r"(?ms)^\s*dependencies\s*=\s*\[(.*?)^\s*\]", text)
if not match:
    raise SystemExit("project dependencies not found in pyproject.toml")
dependencies = ast.literal_eval("[" + match.group(1) + "]")
filtered = [dependency.strip() for dependency in dependencies]
output_path.parent.mkdir(parents=True, exist_ok=True)
output_path.write_text("\n".join(filtered) + "\n", encoding="utf-8")
PY
}