/**
 * Plugin config resolution.
 *
 * The plugin deliberately uses no runtime imports (no schemastery, no
 * dsh-tools): a workspace-linked bundle resolves bare `@deepseek-ai/*`
 * specifiers from its own directory, so it cannot see the dsh installation's
 * packages. Everything here is plain ESM so `node scripts/live-check.mjs` can
 * exercise it before the bundle is installed.
 */

/** Environment variable read when `cookie` is empty. */
export const DEFAULT_COOKIE_ENV = 'ACFUN_COOKIE'

/** Per-request timeout in milliseconds. */
export const DEFAULT_REQUEST_TIMEOUT_MS = 30_000

/** Cooperative per-tool-call budget in milliseconds. */
export const DEFAULT_TOOL_TIMEOUT_MS = 45_000

/** Cooperative budget for a write call (login + token + action). */
export const DEFAULT_WRITE_TIMEOUT_MS = 60_000

/** Largest list size the rank tool accepts (server caps around this). */
export const RANK_MAX_LIMIT = 50

const DEFAULTS = Object.freeze({
  cookie: '',
  cookieEnv: DEFAULT_COOKIE_ENV,
  allowWriteActions: false,
  requestTimeoutMs: DEFAULT_REQUEST_TIMEOUT_MS,
  timeoutMs: DEFAULT_TOOL_TIMEOUT_MS,
})

/** A non-empty trimmed string, or undefined. */
function text(value) {
  return typeof value === 'string' && value.trim().length > 0 ? value.trim() : undefined
}

/** A positive finite number, or undefined. */
function positive(value) {
  return typeof value === 'number' && Number.isFinite(value) && value > 0 ? value : undefined
}

/**
 * Resolve the row config into a plain settings object.
 *
 * Unknown keys are ignored on purpose: the profile patch may carry comments or
 * keys from an older version, and a stale key must not block activation.
 *
 * @param {unknown} raw - the Loader row `config` object, possibly undefined.
 * @param {NodeJS.ProcessEnv | Record<string, string | undefined>} [env] - environment for `cookieEnv`.
 * @returns {{cookie: string, cookieEnv: string, allowWriteActions: boolean, requestTimeoutMs: number, timeoutMs: number, warnings: string[]}}
 */
export function resolveConfig(raw, env = process.env) {
  const source = raw !== null && typeof raw === 'object' && !Array.isArray(raw) ? raw : {}
  const warnings = []

  if (raw !== undefined && (raw === null || typeof raw !== 'object' || Array.isArray(raw))) {
    warnings.push('config must be an object; using defaults')
  }

  const cookieEnv = text(source.cookieEnv) ?? DEFAULT_COOKIE_ENV
  const literalCookie = text(source.cookie)
  const envCookie = text(env?.[cookieEnv])
  const cookie = literalCookie ?? envCookie ?? ''

  if (source.cookie !== undefined && source.cookie !== '' && literalCookie === undefined) {
    warnings.push('config.cookie is set but is not a non-empty string; ignoring it')
  }
  if (typeof source.allowWriteActions !== 'undefined' && typeof source.allowWriteActions !== 'boolean') {
    warnings.push('config.allowWriteActions is not a boolean; using false')
  }

  return {
    cookie,
    cookieEnv,
    cookieSource: literalCookie !== undefined ? 'config' : envCookie !== undefined ? 'env' : 'none',
    allowWriteActions: source.allowWriteActions === true,
    requestTimeoutMs: positive(source.requestTimeoutMs) ?? DEFAULT_REQUEST_TIMEOUT_MS,
    timeoutMs: positive(source.timeoutMs) ?? DEFAULT_TOOL_TIMEOUT_MS,
    warnings,
  }
}