import * as vscode from "vscode";
import * as fs from "fs";
import * as os from "os";
import * as path from "path";
import * as util from "util";
import { sendFileSelectMessage, sendCodeSelectMessage } from "./util";
import { ExtensionContextHolder } from "../util/extensionContext";
import { FilePairManager } from "../util/diffFilePairs";
import { ApiKeyManager } from "../util/apiKey";
import { UiUtilWrapper } from "../util/uiUtil";
import { isValidApiKey } from "../handler/historyMessagesBase";

import { logger } from "../util/logger";

import {
  sendCommandListByDevChatRun,
  updateChatModels,
} from "../handler/workflowCommandHandler";
import DevChat from "../toolwrapper/devchat";
import {
  createEnvByConda,
  createEnvByMamba,
} from "../util/python_installer/app_install";
import { installRequirements } from "../util/python_installer/package_install";
import { chatWithDevChat } from "../handler/chatHandler";
import { focusDevChatInput } from "../handler/focusHandler";

const readdir = util.promisify(fs.readdir);
const stat = util.promisify(fs.stat);
const mkdir = util.promisify(fs.mkdir);
const copyFile = util.promisify(fs.copyFile);

async function copyDirectory(src: string, dest: string): Promise<void> {
  await mkdir(dest, { recursive: true });
  const entries = await readdir(src, { withFileTypes: true });

  for (let entry of entries) {
    const srcPath = path.join(src, entry.name);
    const destPath = path.join(dest, entry.name);

    if (entry.isDirectory()) {
      await copyDirectory(srcPath, destPath);
    } else {
      await copyFile(srcPath, destPath);
    }
  }
}

function registerOpenChatPanelCommand(context: vscode.ExtensionContext) {
  let disposable = vscode.commands.registerCommand(
    "devchat.openChatPanel",
    async () => {
      await vscode.commands.executeCommand("devchat-view.focus");
      await focusDevChatInput(ExtensionContextHolder.provider?.view()!);
    }
  );
  context.subscriptions.push(disposable);
}

async function ensureChatPanel(
  context: vscode.ExtensionContext
): Promise<boolean> {
  await vscode.commands.executeCommand("devchat-view.focus");
  return true;
}

function registerAddContextCommand(context: vscode.ExtensionContext) {
  const callback = async (uri: { fsPath: any }) => {
    if (!(await ensureChatPanel(context))) {
      return;
    }

    await sendFileSelectMessage(
      ExtensionContextHolder.provider?.view()!,
      uri.fsPath
    );
  };
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.addContext", callback)
  );
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.addConext_chinese", callback)
  );
}

function registerAskForCodeCommand(context: vscode.ExtensionContext) {
  const callback = async () => {
    const editor = vscode.window.activeTextEditor;
    if (editor) {
      if (!(await ensureChatPanel(context))) {
        return;
      }

      const selectedText = editor.document.getText(editor.selection);
      await sendCodeSelectMessage(
        ExtensionContextHolder.provider?.view()!,
        editor.document.fileName,
        selectedText,
        editor.selection.start.line
      );
    }
  };
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.askForCode", callback)
  );
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.askForCode_chinese", callback)
  );
}

function registerAskForFileCommand(context: vscode.ExtensionContext) {
  const callback = async () => {
    const editor = vscode.window.activeTextEditor;
    if (editor) {
      if (!(await ensureChatPanel(context))) {
        return;
      }

      await sendFileSelectMessage(
        ExtensionContextHolder.provider?.view()!,
        editor.document.fileName
      );
    }
  };
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.askForFile", callback)
  );
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.askForFile_chinese", callback)
  );
}

function regAccessKeyCommand(
  context: vscode.ExtensionContext,
  provider: string
) {
  context.subscriptions.push(
    vscode.commands.registerCommand(
      `DevChat.AccessKey.${provider}`,
      async () => {
        vscode.commands.executeCommand("devchat-view.focus");
        const passwordInput: string | undefined =
          (await vscode.window.showInputBox({
            password: true,
            title: `Set ${provider} Key`,
            placeHolder: `Input your ${provider} key. (Leave blank to clear the stored key.)`,
          })) ?? undefined;
        if (passwordInput === undefined) {
          return;
        }
        if (provider === "DevChat" && passwordInput.trim() !== "") {
          if (!passwordInput.trim().startsWith("DC.")) {
            UiUtilWrapper.showErrorMessage(
              "Your key is invalid! DevChat Access Key is: DC.xxxxx"
            );
            return;
          }
        }

        if (passwordInput.trim() !== "" && !isValidApiKey(passwordInput)) {
          UiUtilWrapper.showErrorMessage("Your key is invalid!");
          return;
        }
        await ApiKeyManager.writeApiKeySecret(passwordInput, provider);

        // update default model
        const accessKey = await ApiKeyManager.getApiKey();
        if (!accessKey) {
          const modelList = await ApiKeyManager.getValidModels();
          if (modelList && modelList.length > 0) {
            // update default llm model
            await UiUtilWrapper.updateConfiguration(
              "devchat",
              "defaultModel",
              modelList[0]
            );
          }
        }

        // reload webview
        ExtensionContextHolder.provider?.reloadWebview();
      }
    )
  );
}

export function registerAccessKeySettingCommand(
  context: vscode.ExtensionContext
) {
  regAccessKeyCommand(context, "OpenAI");
  regAccessKeyCommand(context, "Cohere");
  regAccessKeyCommand(context, "Anthropic");
  regAccessKeyCommand(context, "Replicate");
  regAccessKeyCommand(context, "HuggingFace");
  regAccessKeyCommand(context, "TogetherAI");
  regAccessKeyCommand(context, "OpenRouter");
  regAccessKeyCommand(context, "VertexAI");
  regAccessKeyCommand(context, "AI21");
  regAccessKeyCommand(context, "BaseTen");
  regAccessKeyCommand(context, "Azure");
  regAccessKeyCommand(context, "SageMaker");
  regAccessKeyCommand(context, "Bedrock");
  regAccessKeyCommand(context, "DevChat");
}

export function registerStatusBarItemClickCommand(
  context: vscode.ExtensionContext
) {
  context.subscriptions.push(
    vscode.commands.registerCommand("devcaht.onStatusBarClick", async () => {
      await vscode.commands.executeCommand("devchat-view.focus");
    })
  );
}

export function regPythonPathCommand(context: vscode.ExtensionContext) {
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.PythonPath", async () => {
      const pythonPath =
        (await vscode.window.showInputBox({
          title: "Set Python Path",
          placeHolder: "Set Python Path",
        })) ?? "";

      if (pythonPath) {
        vscode.workspace
          .getConfiguration("DevChat")
          .update(
            "PythonForChat",
            pythonPath,
            vscode.ConfigurationTarget.Global
          );
      }
    })
  );
}

export function regApplyDiffResultCommand(context: vscode.ExtensionContext) {
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.applyDiffResult", async () => {
      const activeEditor = vscode.window.activeTextEditor;
      const fileName = activeEditor!.document.fileName;

      const [leftUri, rightUri] = FilePairManager.getInstance().findPair(
        fileName
      ) || [undefined, undefined];
      if (leftUri && rightUri) {
        // 获取对比的两个文件
        const leftDoc = await vscode.workspace.openTextDocument(leftUri);
        const rightDoc = await vscode.workspace.openTextDocument(rightUri);

        // close rightDoc
        await vscode.commands.executeCommand(
          "workbench.action.closeActiveEditor"
        );
        // 将右边文档的内容替换到左边文档
        const leftEditor = await vscode.window.showTextDocument(leftDoc);
        await leftEditor.edit((editBuilder) => {
          const fullRange = new vscode.Range(0, 0, leftDoc.lineCount, 0);
          editBuilder.replace(fullRange, rightDoc.getText());
        });

        // 保存左边文档
        await leftDoc.save();
      } else {
        vscode.window.showErrorMessage("No file to apply diff result.");
      }
    })
  );
}

export function registerInstallCommandsCommand(
  context: vscode.ExtensionContext
) {
  let disposable = vscode.commands.registerCommand(
    "DevChat.InstallCommands",
    async () => {
      const homePath = process.env.HOME || process.env.USERPROFILE || "";
      const sysDirPath = path.join(homePath, ".chat", "workflows", "sys");
      const pluginDirPath = path.join(
        UiUtilWrapper.extensionPath(),
        "workflowsCommands"
      ); // Adjust this path as needed

      const devchat = new DevChat();

      if (!fs.existsSync(sysDirPath)) {
        await copyDirectory(pluginDirPath, sysDirPath);
      }

      // Check if ~/.chat/workflows/sys directory exists
      if (!fs.existsSync(sysDirPath)) {
        // Directory does not exist, wait for updateSysCommand to finish
        await devchat.updateSysCommand();
        sendCommandListByDevChatRun();
      } else {
        // Directory exists, execute sendCommandListByDevChatRun immediately
        await sendCommandListByDevChatRun();

        // Then asynchronously execute updateSysCommand
        await devchat.updateSysCommand();
        await sendCommandListByDevChatRun();
      }
    }
  );

  context.subscriptions.push(disposable);
}

export function registerUpdateChatModelsCommand(
  context: vscode.ExtensionContext
) {
  let disposable = vscode.commands.registerCommand(
    "DevChat.UpdataChatModels",
    async () => {
      updateChatModels();
    }
  );

  context.subscriptions.push(disposable);
}

export function registerInstallCommandsPython(
  context: vscode.ExtensionContext
) {
  let disposable = vscode.commands.registerCommand(
    "DevChat.InstallCommandPython",
    async () => {
      // steps of install command python
      // 1. install python >= 3.11
      // 2. check requirements.txt in ~/.chat dir
      // 3. install requirements.txt

      // 1. install python >= 3.11
      logger.channel()?.info(`create env for python ...`);
      logger.channel()?.info(`try to create env by mamba ...`);
      let pythonCommand = await createEnvByMamba(
        "devchat-commands",
        "",
        "3.11.4"
      );

      if (!pythonCommand || pythonCommand === "") {
        logger
          .channel()
          ?.info(`create env by mamba failed, try to create env by conda ...`);
        pythonCommand = await createEnvByConda(
          "devchat-commands",
          "",
          "3.11.4"
        );
      }

      if (!pythonCommand || pythonCommand === "") {
        logger
          .channel()
          ?.error(
            `create virtual python env failed, you need create it by yourself with command: "conda create -n devchat-commands python=3.11.4"`
          );
        logger.channel()?.show();

        return;
      }

      // 2. check requirements.txt in ~/.chat dir
      // ~/.chat/requirements.txt
      const usrRequirementsFile = path.join(
        os.homedir(),
        ".chat",
        "workflows",
        "usr",
        "requirements.txt"
      );
      const orgRequirementsFile = path.join(
        os.homedir(),
        ".chat",
        "workflows",
        "org",
        "requirements.txt"
      );
      const sysRequirementsFile = path.join(
        os.homedir(),
        ".chat",
        "workflows",
        "sys",
        "requirements.txt"
      );
      let requirementsFile = sysRequirementsFile;
      if (fs.existsSync(orgRequirementsFile)) {
        requirementsFile = orgRequirementsFile;
      }
      if (fs.existsSync(usrRequirementsFile)) {
        requirementsFile = usrRequirementsFile;
      }

      if (!fs.existsSync(requirementsFile)) {
        // logger.channel()?.warn(`requirements.txt not found in ~/.chat/workflows dir.`);
        // logger.channel()?.show();
        // vscode.window.showErrorMessage(`Error: see OUTPUT for more detail!`);
        return;
      }

      // 3. install requirements.txt
      // run command: pip install -r {requirementsFile}
      let isInstalled = false;
      // try 3 times
      for (let i = 0; i < 4; i++) {
        let otherSource: string | undefined = undefined;
        if (i > 1) {
          otherSource = "https://pypi.tuna.tsinghua.edu.cn/simple/";
        }
        isInstalled = await installRequirements(
          pythonCommand,
          requirementsFile,
          otherSource
        );
        if (isInstalled) {
          break;
        }
        logger.channel()?.info(`Install packages failed, try again: ${i + 1}`);
      }
      if (!isInstalled) {
        logger
          .channel()
          ?.error(
            `Install packages failed, you can install it with command: "${pythonCommand} -m pip install -r ~/.chat/requirements.txt"`
          );
        logger.channel()?.show();
        vscode.window.showErrorMessage(`Error: see OUTPUT for more detail!`);
        return "";
      }

      UiUtilWrapper.updateConfiguration(
        "DevChat",
        "PythonForCommands",
        pythonCommand.trim()
      );
      // vscode.window.showInformationMessage(`All slash Commands are ready to use! Please input / to try workflow commands!`);
    }
  );

  context.subscriptions.push(disposable);
}

export function registerDevChatChatCommand(context: vscode.ExtensionContext) {
  let disposable = vscode.commands.registerCommand(
    "DevChat.Chat",
    async (message: string) => {
      ensureChatPanel(context);
      if (!ExtensionContextHolder.provider?.view()) {
        // wait 2 seconds
        await new Promise((resolve, reject) => {
          setTimeout(() => {
            resolve(true);
          }, 2000);
        });
      }
      chatWithDevChat(ExtensionContextHolder.provider?.view()!, message);
    }
  );

  context.subscriptions.push(disposable);
}

export function registerCodeLensExplainCommand(
  context: vscode.ExtensionContext
) {
  let disposable = vscode.commands.registerCommand(
    "CodeLens.Explain",
    async (message: string, pos: { start: number; end: number }) => {
      const editor = vscode.window.activeTextEditor;
      if (editor) {
        const range = new vscode.Range(
          new vscode.Position(pos.start, 0),
          new vscode.Position(pos.end, 0)
        );
        editor.selection = new vscode.Selection(range.start, range.end);
      }
      ensureChatPanel(context);
      if (!ExtensionContextHolder.provider?.view()) {
        // wait 2 seconds
        await new Promise((resolve, reject) => {
          setTimeout(() => {
            resolve(true);
          }, 2000);
        });
      }
      chatWithDevChat(ExtensionContextHolder.provider?.view()!, message);
    }
  );

  context.subscriptions.push(disposable);
}

export function registerHandleUri(context: vscode.ExtensionContext) {
  context.subscriptions.push(
    vscode.window.registerUriHandler({
      async handleUri(uri) {
        // 解析 URI 并执行相应的操作
        if (uri.path.includes("accesskey")) {
          const accessKey = uri.path.split("/")[2];
          const modelConfig: any = UiUtilWrapper.getConfiguration(
            "devchat",
            "Provider.devchat"
          );
          const providerConfigNew: any = {};
          if (Object.keys(modelConfig).length !== 0) {
            for (const key of Object.keys(modelConfig || {})) {
              const property = modelConfig![key];
              providerConfigNew[key] = property;
            }
          }
          providerConfigNew.access_key = accessKey;
          vscode.workspace
            .getConfiguration("devchat")
            .update(
              "Provider.devchat",
              providerConfigNew,
              vscode.ConfigurationTarget.Global
            );
          ensureChatPanel(context);
          await new Promise((resolve, reject) => {
            setTimeout(() => {
              resolve(true);
            }, 1000);
          });
          ExtensionContextHolder.provider?.reloadWebview();
        }
      },
    })
  );
}

function registerExplainCommand(context: vscode.ExtensionContext) {
  const callback = async () => {
    const editor = vscode.window.activeTextEditor;
    if (editor) {
      if (!(await ensureChatPanel(context))) {
        return;
      }

      chatWithDevChat(ExtensionContextHolder.provider?.view()!, "/explain");
    }
  };
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.explain", callback)
  );
  context.subscriptions.push(
    vscode.commands.registerCommand("devchat.explain_chinese", callback)
  );
}

export {
  registerOpenChatPanelCommand,
  registerAddContextCommand,
  registerAskForCodeCommand,
  registerAskForFileCommand,
  registerExplainCommand,
};