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

repo_root() {
  local script_dir
  script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
  printf '%s\n' "$script_dir"
}

config_file() {
  printf '%s/config/profiles.yml\n' "$(repo_root)"
}

require_yq() {
  command -v yq >/dev/null 2>&1 || {
    echo "Error: yq is required but not installed." >&2
    exit 1
  }
}

require_config() {
  local cfg
  cfg="$(config_file)"
  [[ -f "$cfg" ]] || {
    echo "Error: missing config file: $cfg" >&2
    echo "Create it from config/profiles.example.yml" >&2
    exit 1
  }
}

cfg_get() {
  local expr="$1"
  yq -r "$expr // \"\"" "$(config_file)"
}

profile_exists() {
  local profile="$1"
  [[ "$(cfg_get ".profiles.${profile}.mode")" != "" ]]
}

clear_claude_env() {
  unset OPENROUTER_API_KEY
  unset ANTHROPIC_BASE_URL
  unset ANTHROPIC_AUTH_TOKEN
  unset ANTHROPIC_API_KEY
  unset ANTHROPIC_MODEL
  unset ANTHROPIC_DEFAULT_OPUS_MODEL
  unset ANTHROPIC_DEFAULT_SONNET_MODEL
  unset ANTHROPIC_DEFAULT_HAIKU_MODEL
  unset CLAUDE_CODE_SUBAGENT_MODEL
}

resolve_env_ref() {
  local value="$1"

  if [[ "$value" =~ ^\$[A-Za-z_][A-Za-z0-9_]*$ ]]; then
    local var_name="${value:1}"
    printf '%s\n' "${!var_name:-}"
  else
    printf '%s\n' "$value"
  fi
}

launch_profile() {
  local profile="$1"
  local mode claude_cmd base_url api_key model

  require_yq
  require_config

  profile_exists "$profile" || {
    echo "Error: profile '$profile' not found in $(config_file)" >&2
    exit 1
  }

  claude_cmd="$(cfg_get '.defaults.claude_cmd')"
  [[ -n "$claude_cmd" ]] || claude_cmd="claude"

  mode="$(cfg_get ".profiles.${profile}.mode")"

  clear_claude_env

  case "$mode" in
    pro)
      echo "Claude Pro profile active"
      exec "$claude_cmd"
      ;;
    openrouter)
      base_url="$(cfg_get '.defaults.openrouter_base_url')"
      [[ -n "$base_url" ]] || base_url="https://openrouter.ai/api"

      api_key="$(cfg_get ".profiles.${profile}.openrouter_api_key")"
      api_key="$(resolve_env_ref "$api_key")"
      model="$(cfg_get ".profiles.${profile}.model")"

      [[ -n "$api_key" && "$api_key" != "REPLACE_ME" ]] || {
        echo "Error: openrouter_api_key missing for profile '$profile'" >&2
        exit 1
      }

      [[ -n "$model" ]] || {
        echo "Error: model missing for profile '$profile'" >&2
        exit 1
      }

      export OPENROUTER_API_KEY="$api_key"
      export ANTHROPIC_BASE_URL="$base_url"
      export ANTHROPIC_AUTH_TOKEN="$OPENROUTER_API_KEY"
      export ANTHROPIC_API_KEY=""
      export ANTHROPIC_MODEL="$model"

      echo "OpenRouter profile active: $profile -> $model"
      exec "$claude_cmd"
      ;;
    *)
      echo "Error: unsupported mode '$mode' for profile '$profile'" >&2
      exit 1
      ;;
  esac
}