#!/usr/bin/env bash

set -euo pipefail

script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
repo_root="$(cd -- "$script_dir/.." && pwd -P)"
canonical_home="${COPILOT_RESOURCES_HOME:-$HOME/.copilot-resources}"
copilot_home="${COPILOT_HOME:-$HOME/.copilot}"
quick="false"

detect_vscode_user_dir() {
  if [[ -n "${VSCODE_USER_DIR:-}" ]]; then
    printf '%s\n' "$VSCODE_USER_DIR"
    return 0
  fi

  case "$(uname -s)" in
    Darwin)
      printf '%s\n' "$HOME/Library/Application Support/Code/User"
      ;;
    Linux)
      printf '%s\n' "$HOME/.config/Code/User"
      ;;
    *)
      printf '%s\n' "$HOME/.config/Code/User"
      ;;
  esac
}

check_path() {
  local label="$1"
  local path="$2"

  if [[ -e "$path" ]]; then
    printf '[ok] %s: %s\n' "$label" "$path"
  else
    printf '[missing] %s: %s\n' "$label" "$path" >&2
    return 1
  fi
}

check_command() {
  local label="$1"
  local command_name="$2"

  if command -v "$command_name" >/dev/null 2>&1; then
    printf '[ok] %s: %s\n' "$label" "$command_name"
  else
    printf '[missing] %s: %s\n' "$label" "$command_name" >&2
    return 1
  fi
}

check_readable_file() {
  local label="$1"
  local path="$2"

  if [[ -r "$path" ]]; then
    printf '[ok] %s: %s\n' "$label" "$path"
  else
    printf '[unreadable] %s: %s\n' "$label" "$path" >&2
    return 1
  fi
}

main() {
  if [[ "${1:-}" == "--quick" ]]; then
    quick="true"
  fi

  local vscode_user_dir
  vscode_user_dir="$(detect_vscode_user_dir)"
  local vscode_mcp_file="$vscode_user_dir/mcp.json"
  local copilot_cli_mcp_file="$copilot_home/mcp-config.json"
  local local_mcp_overrides_file="$canonical_home/.local/mcp.local.jsonc"
  local session_start_hook_file="$canonical_home/resources/hooks/session-audit.json"
  local session_start_hook_script="$canonical_home/resources/scripts/report-hook-event.sh"

  check_path "repo root" "$repo_root"
  check_path "canonical home" "$canonical_home"
  check_path "skills link" "$copilot_home/skills"
  check_path "agents link" "$copilot_home/agents"
  check_path "instructions link" "$copilot_home/instructions"
  check_path "hooks link" "$copilot_home/hooks"
  check_path "session start hook" "$session_start_hook_file"
  check_path "session start hook script" "$session_start_hook_script"
  check_readable_file "session start hook script" "$session_start_hook_script"
  check_command "session start hook shell" "bash"
  check_path "prompts link" "$vscode_user_dir/prompts"
  check_path "VS Code MCP config" "$vscode_mcp_file"
  check_path "Copilot CLI MCP config" "$copilot_cli_mcp_file"
  check_path "local MCP overrides" "$local_mcp_overrides_file"

  if [[ "$quick" != "true" ]]; then
    check_path "VS Code settings template" "$repo_root/config/vscode/settings.template.jsonc"
    check_path "CLI env template" "$repo_root/config/copilot-cli/env.example.sh"
    check_path "VS Code MCP template" "$repo_root/config/mcp/vscode.mcp.template.jsonc"
    check_path "Copilot CLI MCP template" "$repo_root/config/mcp/copilot-cli.mcp.template.jsonc"
    check_path "MCP local override example" "$repo_root/config/mcp/local-overrides.example.jsonc"
    check_path "Copilot CLI filesystem wrapper" "$repo_root/install/mcp/copilot-cli-filesystem-wrapper.mjs"
  fi
}

main "$@"