import { readAuthFile } from '../../opencode/auth.js';
import { readConfigLayers } from '../../opencode/shared.js';
import {
  getAuthEntry,
  normalizeAuthEntry,
  buildResult,
  toUsageWindow,
  toNumber,
  toTimestamp,
  resolveWindowSeconds,
  resolveWindowLabel,
  normalizeTimestamp
} from '../utils/index.js';

export const providerId = 'zhipuai-coding-plan';
export const providerName = 'ZhipuAI';
export const aliases = ['zhipuai-coding-plan', 'zhipuai', 'zhipu'];

function getApiKey() {
  const auth = readAuthFile();
  const oldEntry = normalizeAuthEntry(getAuthEntry(auth, aliases));
  const apiKeyFromOld = oldEntry?.key ?? oldEntry?.token;

  if (apiKeyFromOld) {
    return apiKeyFromOld;
  }

  try {
    const layers = readConfigLayers();
    const { mergedConfig } = layers;

    for (const alias of aliases) {
      const providerConfig = mergedConfig?.provider?.[alias];
      if (providerConfig?.options?.apiKey) {
        return providerConfig.options.apiKey;
      }
    }
  } catch (error) {
    // Ignore read errors
  }

  return null;
}

export const isConfigured = () => {
  return Boolean(getApiKey());
};

export const fetchQuota = async () => {
  const apiKey = getApiKey();

  if (!apiKey) {
    return buildResult({
      providerId,
      providerName,
      ok: false,
      configured: false,
      error: 'Not configured'
    });
  }

  try {
    const response = await fetch('https://open.bigmodel.cn/api/monitor/usage/quota/limit', {
      method: 'GET',
      headers: {
        Authorization: `Bearer ${apiKey}`,
        'Content-Type': 'application/json'
      }
    });

    if (!response.ok) {
      return buildResult({
        providerId,
        providerName,
        ok: false,
        configured: true,
        error: `API error: ${response.status}`
      });
    }

    const payload = await response.json();
    const limits = Array.isArray(payload?.data?.limits) ? payload.data.limits : [];
    const tokensLimit = limits.find((limit) => limit?.type === 'TOKENS_LIMIT');
    const windowSeconds = resolveWindowSeconds(tokensLimit);
    const windowLabel = resolveWindowLabel(windowSeconds);
    const resetAt = tokensLimit?.nextResetTime ? normalizeTimestamp(tokensLimit.nextResetTime) : null;
    const usedPercent = typeof tokensLimit?.percentage === 'number' ? tokensLimit.percentage : null;

    const windows = {};
    if (tokensLimit) {
      windows[windowLabel] = toUsageWindow({
        usedPercent,
        windowSeconds,
        resetAt
      });
    }

    return buildResult({
      providerId,
      providerName,
      ok: true,
      configured: true,
      usage: { windows }
    });
  } catch (error) {
    return buildResult({
      providerId,
      providerName,
      ok: false,
      configured: true,
      error: error instanceof Error ? error.message : 'Request failed'
    });
  }
};