import React, { useState, useEffect } from "react";
import { Provider } from "../types";
import {
  updateCoAuthoredSetting,
  checkCoAuthoredSetting,
  extractWebsiteUrl,
  getApiKeyFromConfig,
  hasApiKeyField,
  setApiKeyInConfig,
} from "../utils/providerConfigUtils";
import { providerPresets } from "../config/providerPresets";
import "./AddProviderModal.css";

interface ProviderFormProps {
  title: string;
  submitText: string;
  initialData?: Provider;
  showPresets?: boolean;
  onSubmit: (data: Omit<Provider, "id">) => void;
  onClose: () => void;
}

const ProviderForm: React.FC<ProviderFormProps> = ({
  title,
  submitText,
  initialData,
  showPresets = false,
  onSubmit,
  onClose,
}) => {
  const [formData, setFormData] = useState({
    name: initialData?.name || "",
    websiteUrl: initialData?.websiteUrl || "",
    settingsConfig: initialData
      ? JSON.stringify(initialData.settingsConfig, null, 2)
      : "",
  });
  const [error, setError] = useState("");
  const [disableCoAuthored, setDisableCoAuthored] = useState(false);
  const [selectedPreset, setSelectedPreset] = useState<number | null>(null);
  const [apiKey, setApiKey] = useState("");

  // 初始化时检查禁用签名状态
  useEffect(() => {
    if (initialData) {
      const configString = JSON.stringify(initialData.settingsConfig, null, 2);
      const hasCoAuthoredDisabled = checkCoAuthoredSetting(configString);
      setDisableCoAuthored(hasCoAuthoredDisabled);
    }
  }, [initialData]);

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    setError("");

    if (!formData.name) {
      setError("请填写供应商名称");
      return;
    }

    if (!formData.settingsConfig.trim()) {
      setError("请填写配置内容");
      return;
    }

    let settingsConfig: Record<string, any>;

    try {
      settingsConfig = JSON.parse(formData.settingsConfig);
    } catch (err) {
      setError("配置JSON格式错误，请检查语法");
      return;
    }

    onSubmit({
      name: formData.name,
      websiteUrl: formData.websiteUrl,
      settingsConfig,
    });
  };

  const handleChange = (
    e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>
  ) => {
    const { name, value } = e.target;

    if (name === "settingsConfig") {
      // 当用户修改配置时，尝试自动提取官网地址
      const extractedWebsiteUrl = extractWebsiteUrl(value);

      // 同时检查并同步选择框状态
      const hasCoAuthoredDisabled = checkCoAuthoredSetting(value);
      setDisableCoAuthored(hasCoAuthoredDisabled);

      // 同步 API Key 输入框显示与值
      const parsedKey = getApiKeyFromConfig(value);
      setApiKey(parsedKey);

      setFormData({
        ...formData,
        [name]: value,
        // 只有在官网地址为空时才自动填入
        websiteUrl: formData.websiteUrl || extractedWebsiteUrl,
      });
    } else {
      setFormData({
        ...formData,
        [name]: value,
      });
    }
  };

  // 处理选择框变化
  const handleCoAuthoredToggle = (checked: boolean) => {
    setDisableCoAuthored(checked);

    // 更新JSON配置
    const updatedConfig = updateCoAuthoredSetting(
      formData.settingsConfig,
      checked
    );
    setFormData({
      ...formData,
      settingsConfig: updatedConfig,
    });
  };

  const applyPreset = (preset: (typeof providerPresets)[0], index: number) => {
    const configString = JSON.stringify(preset.settingsConfig, null, 2);

    setFormData({
      name: preset.name,
      websiteUrl: preset.websiteUrl,
      settingsConfig: configString,
    });

    // 设置选中的预设
    setSelectedPreset(index);

    // 清空 API Key 输入框，让用户重新输入
    setApiKey("");

    // 同步选择框状态
    const hasCoAuthoredDisabled = checkCoAuthoredSetting(configString);
    setDisableCoAuthored(hasCoAuthoredDisabled);
  };

  // 处理 API Key 输入并自动更新配置
  const handleApiKeyChange = (key: string) => {
    setApiKey(key);

    const configString = setApiKeyInConfig(
      formData.settingsConfig,
      key.trim(),
      { createIfMissing: selectedPreset !== null }
    );

    // 更新表单配置
    setFormData((prev) => ({
      ...prev,
      settingsConfig: configString,
    }));

    // 同步选择框状态
    const hasCoAuthoredDisabled = checkCoAuthoredSetting(configString);
    setDisableCoAuthored(hasCoAuthoredDisabled);
  };

  // 根据当前配置决定是否展示 API Key 输入框
  const showApiKey =
    selectedPreset !== null || hasApiKeyField(formData.settingsConfig);

  // 初始时从配置中同步 API Key（编辑模式）
  useEffect(() => {
    if (initialData) {
      const parsedKey = getApiKeyFromConfig(
        JSON.stringify(initialData.settingsConfig)
      );
      if (parsedKey) setApiKey(parsedKey);
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  // 支持按下 ESC 关闭弹窗
  useEffect(() => {
    const onKeyDown = (e: KeyboardEvent) => {
      if (e.key === "Escape") {
        e.preventDefault();
        onClose();
      }
    };
    window.addEventListener("keydown", onKeyDown);
    return () => window.removeEventListener("keydown", onKeyDown);
  }, [onClose]);

  return (
    <div
      className="modal-overlay"
      onMouseDown={(e) => {
        if (e.target === e.currentTarget) onClose();
      }}
    >
      <div className="modal-content">
        <div className="modal-titlebar">
          <div className="modal-spacer" />
          <div className="modal-title" title={title}>
            {title}
          </div>
          <button
            type="button"
            className="modal-close-btn"
            aria-label="关闭"
            onClick={onClose}
            title="关闭"
          >
            ×
          </button>
        </div>

        <form onSubmit={handleSubmit} className="modal-form">
          <div className="modal-body">
            {error && <div className="error-message">{error}</div>}

            {showPresets && (
              <div className="presets">
                <label>一键导入（只需要填写 key）</label>
                <div className="preset-buttons">
                  {providerPresets.map((preset, index) => (
                    <button
                      key={index}
                      type="button"
                      className={`preset-btn ${
                        selectedPreset === index ? "selected" : ""
                      }`}
                      onClick={() => applyPreset(preset, index)}
                    >
                      {preset.name}
                    </button>
                  ))}
                </div>
              </div>
            )}

            <div className="form-group">
              <label htmlFor="name">供应商名称 *</label>
              <input
                type="text"
                id="name"
                name="name"
                value={formData.name}
                onChange={handleChange}
                placeholder="例如：Anthropic 官方"
                required
                autoComplete="off"
              />
            </div>

            <div className={`form-group api-key-group ${!showApiKey ? 'hidden' : ''}`}>
              <label htmlFor="apiKey">API Key *</label>
              <input
                type="text"
                id="apiKey"
                value={apiKey}
                onChange={(e) => handleApiKeyChange(e.target.value)}
                placeholder="只需要填这里，下方配置会自动填充"
                autoComplete="off"
              />
            </div>

            <div className="form-group">
              <label htmlFor="websiteUrl">官网地址</label>
              <input
                type="url"
                id="websiteUrl"
                name="websiteUrl"
                value={formData.websiteUrl}
                onChange={handleChange}
                placeholder="https://example.com（可选）"
                autoComplete="off"
              />
            </div>

            <div className="form-group">
              <div className="label-with-checkbox">
                <label htmlFor="settingsConfig">
                  Claude Code 配置 (JSON) *
                </label>
                <label className="checkbox-label">
                  <input
                    type="checkbox"
                    checked={disableCoAuthored}
                    onChange={(e) => handleCoAuthoredToggle(e.target.checked)}
                  />
                  禁止 Claude Code 签名
                </label>
              </div>
              <textarea
                id="settingsConfig"
                name="settingsConfig"
                value={formData.settingsConfig}
                onChange={handleChange}
                placeholder={`{
  "env": {
    "ANTHROPIC_BASE_URL": "https://api.anthropic.com",
    "ANTHROPIC_AUTH_TOKEN": "sk-your-api-key-here"
  }
}`}
                rows={12}
                style={{ fontFamily: "monospace", fontSize: "14px" }}
                required
              />
              <small className="field-hint">
                完整的 Claude Code settings.json 配置内容
              </small>
            </div>
          </div>

          <div className="modal-footer">
            <button type="button" className="cancel-btn" onClick={onClose}>
              取消
            </button>
            <button type="submit" className="submit-btn">
              {submitText}
            </button>
          </div>
        </form>
      </div>
    </div>
  );
};

export default ProviderForm;