import dotenv from "dotenv";
import fs from "fs";
import path from "path";

dotenv.config({ path: path.resolve(process.cwd(), ".env") });

function toBool(value, fallback = false) {
  if (value == null) {
    return fallback;
  }

  return String(value).toLowerCase() === "true";
}

export function getActiveApiKey() {
  const activeKey = (process.env.ACTIVE_KEY ?? "pro").toLowerCase();
  if (activeKey === "lite") {
    return process.env.API_KEY_LITE ?? "";
  }

  return process.env.API_KEY_PRO ?? "";
}

export function getRuntimeConfig() {
  const claudeBin = resolveClaudeBinary(process.env.CLAUDE_BIN ?? "claude");
  return {
    port: Number(process.env.PORT ?? 3001),
    nodeEnv: process.env.NODE_ENV ?? "development",
    claudeBin,
    shell: process.env.CLAUDE_SHELL ?? "/bin/zsh",
    workspaceDir: process.env.CLAUDE_WORKSPACE_DIR
      ? path.resolve(process.env.CLAUDE_WORKSPACE_DIR)
      : process.cwd(),
    anthropicBaseUrl: process.env.ANTHROPIC_BASE_URL ?? "",
    anthropicModel: process.env.ANTHROPIC_MODEL ?? "",
    activeKey: (process.env.ACTIVE_KEY ?? "pro").toLowerCase(),
    claudeArgs: process.env.CLAUDE_ARGS?.trim() ? process.env.CLAUDE_ARGS.trim().split(/\s+/) : ["--dangerously-skip-permissions"],
    watchLogLimit: Number(process.env.WATCH_LOG_LIMIT ?? 400),
    chatChunkLimit: Number(process.env.CHAT_CHUNK_LIMIT ?? 2000),
    logToConsole: toBool(process.env.LOG_TO_CONSOLE, true)
  };
}

function resolveClaudeBinary(rawValue) {
  const candidates = [];

  if (rawValue) {
    candidates.push(rawValue);
  }

  candidates.push("/Users/wisecolt-macmini/.local/bin/claude");
  candidates.push("/usr/local/bin/claude");
  candidates.push("/opt/homebrew/bin/claude");

  for (const candidate of candidates) {
    if (path.isAbsolute(candidate) && fs.existsSync(candidate)) {
      return candidate;
    }
  }

  const pathEntries = String(process.env.PATH ?? "").split(path.delimiter);
  for (const entry of pathEntries) {
    const candidate = path.join(entry, rawValue);
    if (fs.existsSync(candidate)) {
      return candidate;
    }
  }

  return rawValue;
}

export function getClaudeEnv(config) {
  const cleanEnv = { ...process.env };
  delete cleanEnv.ANTHROPIC_AUTH_TOKEN;

  return {
    ...cleanEnv,
    ANTHROPIC_API_KEY: getActiveApiKey(),
    ANTHROPIC_BASE_URL: config.anthropicBaseUrl,
    ANTHROPIC_MODEL: config.anthropicModel,
    TERM: "xterm-256color",
    COLORTERM: "truecolor"
  };
}

export function getPublicRuntimeConfig(config) {
  return {
    claudeBin: config.claudeBin,
    anthropicBaseUrl: config.anthropicBaseUrl,
    anthropicModel: config.anthropicModel,
    activeKey: config.activeKey,
    workspaceDir: config.workspaceDir
  };
}