import { execSync } from "child_process";
import ciInfo from "ci-info";
import fs from "fs";
import path from "path";
import { blue, green, red } from "picocolors";
import prompts from "prompts";
import { InstallAppArgs } from "./create-app";
import {
  FileSourceConfig,
  TemplateDataSourceType,
  TemplateFramework,
} from "./helpers";
import { COMMUNITY_OWNER, COMMUNITY_REPO } from "./helpers/constant";
import { templatesDir } from "./helpers/dir";
import { getAvailableLlamapackOptions } from "./helpers/llama-pack";
import { getRepoRootFolders } from "./helpers/repo";
import { supportedTools, toolsRequireConfig } from "./helpers/tools";

export type QuestionArgs = Omit<
  InstallAppArgs,
  "appPath" | "packageManager"
> & { files?: string; llamaParse?: boolean };
const supportedContextFileTypes = [
  ".pdf",
  ".doc",
  ".docx",
  ".xls",
  ".xlsx",
  ".csv",
];
const MACOS_FILE_SELECTION_SCRIPT = `
osascript -l JavaScript -e '
  a = Application.currentApplication();
  a.includeStandardAdditions = true;
  a.chooseFile({ withPrompt: "Please select a file to process:" }).toString()
'`;
const MACOS_FOLDER_SELECTION_SCRIPT = `
osascript -l JavaScript -e '
  a = Application.currentApplication();
  a.includeStandardAdditions = true;
  a.chooseFolder({ withPrompt: "Please select a folder to process:" }).toString()
'`;
const WINDOWS_FILE_SELECTION_SCRIPT = `
Add-Type -AssemblyName System.Windows.Forms
$openFileDialog = New-Object System.Windows.Forms.OpenFileDialog
$openFileDialog.InitialDirectory = [Environment]::GetFolderPath('Desktop')
$result = $openFileDialog.ShowDialog()
if ($result -eq 'OK') {
  $openFileDialog.FileName
}
`;
const WINDOWS_FOLDER_SELECTION_SCRIPT = `
Add-Type -AssemblyName System.windows.forms
$folderBrowser = New-Object System.Windows.Forms.FolderBrowserDialog
$dialogResult = $folderBrowser.ShowDialog()
if ($dialogResult -eq [System.Windows.Forms.DialogResult]::OK)
{
    $folderBrowser.SelectedPath
}
`;

const defaults: QuestionArgs = {
  template: "streaming",
  framework: "nextjs",
  engine: "simple",
  ui: "html",
  eslint: true,
  frontend: false,
  openAiKey: "",
  llamaCloudKey: "",
  model: "gpt-3.5-turbo",
  embeddingModel: "text-embedding-ada-002",
  communityProjectPath: "",
  llamapack: "",
  postInstallAction: "dependencies",
  dataSource: {
    type: "none",
    config: {},
  },
  tools: [],
};

const handlers = {
  onCancel: () => {
    console.error("Exiting.");
    process.exit(1);
  },
};

const getVectorDbChoices = (framework: TemplateFramework) => {
  const choices = [
    {
      title: "No, just store the data in the file system",
      value: "none",
    },
    { title: "MongoDB", value: "mongo" },
    { title: "PostgreSQL", value: "pg" },
    { title: "Pinecone", value: "pinecone" },
  ];

  const vectordbLang = framework === "fastapi" ? "python" : "typescript";
  const compPath = path.join(templatesDir, "components");
  const vectordbPath = path.join(compPath, "vectordbs", vectordbLang);

  const availableChoices = fs
    .readdirSync(vectordbPath)
    .filter((file) => fs.statSync(path.join(vectordbPath, file)).isDirectory());

  const displayedChoices = choices.filter((choice) =>
    availableChoices.includes(choice.value),
  );

  return displayedChoices;
};

const getDataSourceChoices = (framework: TemplateFramework) => {
  const choices = [
    {
      title: "No data, just a simple chat",
      value: "simple",
    },
    { title: "Use an example PDF", value: "exampleFile" },
  ];
  if (process.platform === "win32" || process.platform === "darwin") {
    choices.push({
      title: `Use a local file (${supportedContextFileTypes.join(", ")})`,
      value: "localFile",
    });
    choices.push({
      title: `Use a local folder`,
      value: "localFolder",
    });
  }
  if (framework === "fastapi") {
    choices.push({
      title: "Use website content (requires Chrome)",
      value: "web",
    });
  }
  return choices;
};

const selectLocalContextData = async (type: TemplateDataSourceType) => {
  try {
    let selectedPath: string = "";
    let execScript: string;
    let execOpts: any = {};
    switch (process.platform) {
      case "win32": // Windows
        execScript =
          type === "file"
            ? WINDOWS_FILE_SELECTION_SCRIPT
            : WINDOWS_FOLDER_SELECTION_SCRIPT;
        execOpts = { shell: "powershell.exe" };
        break;
      case "darwin": // MacOS
        execScript =
          type === "file"
            ? MACOS_FILE_SELECTION_SCRIPT
            : MACOS_FOLDER_SELECTION_SCRIPT;
        break;
      default: // Unsupported OS
        console.log(red("Unsupported OS error!"));
        process.exit(1);
    }
    selectedPath = execSync(execScript, execOpts).toString().trim();
    if (type === "file") {
      const fileType = path.extname(selectedPath);
      if (!supportedContextFileTypes.includes(fileType)) {
        console.log(
          red(
            `Please select a supported file type: ${supportedContextFileTypes}`,
          ),
        );
        process.exit(1);
      }
    }
    return selectedPath;
  } catch (error) {
    console.log(
      red(
        "Got an error when trying to select local context data! Please try again or select another data source option.",
      ),
    );
    process.exit(1);
  }
};

export const onPromptState = (state: any) => {
  if (state.aborted) {
    // If we don't re-enable the terminal cursor before exiting
    // the program, the cursor will remain hidden
    process.stdout.write("\x1B[?25h");
    process.stdout.write("\n");
    process.exit(1);
  }
};

export const askQuestions = async (
  program: QuestionArgs,
  preferences: QuestionArgs,
) => {
  const getPrefOrDefault = <K extends keyof QuestionArgs>(
    field: K,
  ): QuestionArgs[K] => preferences[field] ?? defaults[field];

  // Ask for next action after installation
  async function askPostInstallAction() {
    if (program.postInstallAction === undefined) {
      if (ciInfo.isCI) {
        program.postInstallAction = getPrefOrDefault("postInstallAction");
      } else {
        const actionChoices = [
          {
            title: "Just generate code (~1 sec)",
            value: "none",
          },
          {
            title: "Generate code and install dependencies (~2 min)",
            value: "dependencies",
          },
        ];

        const hasOpenAiKey = program.openAiKey || process.env["OPENAI_API_KEY"];
        const hasVectorDb = program.vectorDb && program.vectorDb !== "none";
        // Can run the app if all tools do not require configuration
        if (
          !hasVectorDb &&
          hasOpenAiKey &&
          !toolsRequireConfig(program.tools) &&
          !program.llamapack
        ) {
          actionChoices.push({
            title:
              "Generate code, install dependencies, and run the app (~2 min)",
            value: "runApp",
          });
        }

        const { action } = await prompts(
          {
            type: "select",
            name: "action",
            message: "How would you like to proceed?",
            choices: actionChoices,
            initial: 1,
          },
          handlers,
        );

        program.postInstallAction = action;
      }
    }
  }

  if (!program.template) {
    if (ciInfo.isCI) {
      program.template = getPrefOrDefault("template");
    } else {
      const styledRepo = blue(
        `https://github.com/${COMMUNITY_OWNER}/${COMMUNITY_REPO}`,
      );
      const { template } = await prompts(
        {
          type: "select",
          name: "template",
          message: "Which template would you like to use?",
          choices: [
            { title: "Chat without streaming", value: "simple" },
            { title: "Chat with streaming", value: "streaming" },
            {
              title: `Community template from ${styledRepo}`,
              value: "community",
            },
            {
              title: "Example using a LlamaPack",
              value: "llamapack",
            },
          ],
          initial: 1,
        },
        handlers,
      );
      program.template = template;
      preferences.template = template;
    }
  }

  if (program.template === "community") {
    const rootFolderNames = await getRepoRootFolders(
      COMMUNITY_OWNER,
      COMMUNITY_REPO,
    );
    const { communityProjectPath } = await prompts(
      {
        type: "select",
        name: "communityProjectPath",
        message: "Select community template",
        choices: rootFolderNames.map((name) => ({
          title: name,
          value: name,
        })),
        initial: 0,
      },
      handlers,
    );
    program.communityProjectPath = communityProjectPath;
    preferences.communityProjectPath = communityProjectPath;
    return; // early return - no further questions needed for community projects
  }

  if (program.template === "llamapack") {
    const availableLlamaPacks = await getAvailableLlamapackOptions();
    const { llamapack } = await prompts(
      {
        type: "select",
        name: "llamapack",
        message: "Select LlamaPack",
        choices: availableLlamaPacks.map((pack) => ({
          title: pack.name,
          value: pack.folderPath,
        })),
        initial: 0,
      },
      handlers,
    );
    program.llamapack = llamapack;
    preferences.llamapack = llamapack;
    await askPostInstallAction();
    return; // early return - no further questions needed for llamapack projects
  }

  if (!program.framework) {
    if (ciInfo.isCI) {
      program.framework = getPrefOrDefault("framework");
    } else {
      const choices = [
        { title: "Express", value: "express" },
        { title: "FastAPI (Python)", value: "fastapi" },
      ];
      if (program.template === "streaming") {
        // allow NextJS only for streaming template
        choices.unshift({ title: "NextJS", value: "nextjs" });
      }

      const { framework } = await prompts(
        {
          type: "select",
          name: "framework",
          message: "Which framework would you like to use?",
          choices,
          initial: 0,
        },
        handlers,
      );
      program.framework = framework;
      preferences.framework = framework;
    }
  }

  if (
    program.template === "streaming" &&
    (program.framework === "express" || program.framework === "fastapi")
  ) {
    // if a backend-only framework is selected, ask whether we should create a frontend
    // (only for streaming backends)
    if (program.frontend === undefined) {
      if (ciInfo.isCI) {
        program.frontend = getPrefOrDefault("frontend");
      } else {
        const styledNextJS = blue("NextJS");
        const styledBackend = green(
          program.framework === "express"
            ? "Express "
            : program.framework === "fastapi"
              ? "FastAPI (Python) "
              : "",
        );
        const { frontend } = await prompts({
          onState: onPromptState,
          type: "toggle",
          name: "frontend",
          message: `Would you like to generate a ${styledNextJS} frontend for your ${styledBackend}backend?`,
          initial: getPrefOrDefault("frontend"),
          active: "Yes",
          inactive: "No",
        });
        program.frontend = Boolean(frontend);
        preferences.frontend = Boolean(frontend);
      }
    }
  } else {
    program.frontend = false;
  }

  if (program.framework === "nextjs" || program.frontend) {
    if (!program.ui) {
      if (ciInfo.isCI) {
        program.ui = getPrefOrDefault("ui");
      } else {
        const { ui } = await prompts(
          {
            type: "select",
            name: "ui",
            message: "Which UI would you like to use?",
            choices: [
              { title: "Just HTML", value: "html" },
              { title: "Shadcn", value: "shadcn" },
            ],
            initial: 0,
          },
          handlers,
        );
        program.ui = ui;
        preferences.ui = ui;
      }
    }
  }

  if (!program.model) {
    if (ciInfo.isCI) {
      program.model = getPrefOrDefault("model");
    } else {
      const { model } = await prompts(
        {
          type: "select",
          name: "model",
          message: "Which model would you like to use?",
          choices: [
            { title: "gpt-3.5-turbo", value: "gpt-3.5-turbo-0125" },
            { title: "gpt-4-turbo-preview", value: "gpt-4-turbo-preview" },
            { title: "gpt-4", value: "gpt-4" },
            {
              title: "gpt-4-vision-preview",
              value: "gpt-4-vision-preview",
            },
          ],
          initial: 0,
        },
        handlers,
      );
      program.model = model;
      preferences.model = model;
    }
  }

  if (!program.embeddingModel && program.framework === "fastapi") {
    if (ciInfo.isCI) {
      program.embeddingModel = getPrefOrDefault("embeddingModel");
    } else {
      const { embeddingModel } = await prompts(
        {
          type: "select",
          name: "embeddingModel",
          message: "Which embedding model would you like to use?",
          choices: [
            {
              title: "text-embedding-ada-002",
              value: "text-embedding-ada-002",
            },
            {
              title: "text-embedding-3-small",
              value: "text-embedding-3-small",
            },
            {
              title: "text-embedding-3-large",
              value: "text-embedding-3-large",
            },
          ],
          initial: 0,
        },
        handlers,
      );
      program.embeddingModel = embeddingModel;
      preferences.embeddingModel = embeddingModel;
    }
  }

  if (program.files) {
    // If user specified files option, then the program should use context engine
    program.engine == "context";
    if (!fs.existsSync(program.files)) {
      console.log("File or folder not found");
      process.exit(1);
    } else {
      program.dataSource = {
        type: fs.lstatSync(program.files).isDirectory() ? "folder" : "file",
        config: {
          path: program.files,
        },
      };
    }
  }

  if (!program.engine) {
    if (ciInfo.isCI) {
      program.engine = getPrefOrDefault("engine");
    } else {
      const { dataSource } = await prompts(
        {
          type: "select",
          name: "dataSource",
          message: "Which data source would you like to use?",
          choices: getDataSourceChoices(program.framework),
          initial: 1,
        },
        handlers,
      );
      // Initialize with default config
      program.dataSource = getPrefOrDefault("dataSource");
      if (program.dataSource) {
        switch (dataSource) {
          case "simple":
            program.engine = "simple";
            program.dataSource = { type: "none", config: {} };
            break;
          case "exampleFile":
            program.engine = "context";
            // Treat example as a folder data source with no config
            program.dataSource = { type: "folder", config: {} };
            break;
          case "localFile":
            program.engine = "context";
            program.dataSource = {
              type: "file",
              config: {
                path: await selectLocalContextData("file"),
              },
            };
            break;
          case "localFolder":
            program.engine = "context";
            program.dataSource = {
              type: "folder",
              config: {
                path: await selectLocalContextData("folder"),
              },
            };
            break;
          case "web":
            program.engine = "context";
            program.dataSource.type = "web";
            break;
        }
      }
    }
  } else if (!program.dataSource) {
    // Handle a case when engine is specified but dataSource is not
    if (program.engine === "context") {
      program.dataSource = {
        type: "folder",
        config: {},
      };
    } else if (program.engine === "simple") {
      program.dataSource = {
        type: "none",
        config: {},
      };
    }
  }

  if (
    (program.dataSource?.type === "file" ||
      program.dataSource?.type === "folder") &&
    program.framework === "fastapi"
  ) {
    if (ciInfo.isCI) {
      program.llamaCloudKey = getPrefOrDefault("llamaCloudKey");
    } else {
      const dataSourceConfig = program.dataSource.config as FileSourceConfig;
      dataSourceConfig.useLlamaParse = program.llamaParse;

      // Is pdf file selected as data source or is it a folder data source
      const askingLlamaParse =
        dataSourceConfig.useLlamaParse === undefined &&
        (program.dataSource.type === "folder"
          ? true
          : dataSourceConfig.path &&
            path.extname(dataSourceConfig.path) === ".pdf");

      // Ask if user wants to use LlamaParse
      if (askingLlamaParse) {
        const { useLlamaParse } = await prompts(
          {
            type: "toggle",
            name: "useLlamaParse",
            message:
              "Would you like to use LlamaParse (improved parser for RAG - requires API key)?",
            initial: true,
            active: "yes",
            inactive: "no",
          },
          handlers,
        );
        dataSourceConfig.useLlamaParse = useLlamaParse;
        program.dataSource.config = dataSourceConfig;
      }

      // Ask for LlamaCloud API key
      if (
        dataSourceConfig.useLlamaParse &&
        program.llamaCloudKey === undefined
      ) {
        const { llamaCloudKey } = await prompts(
          {
            type: "text",
            name: "llamaCloudKey",
            message: "Please provide your LlamaIndex Cloud API key:",
            validate: (value) =>
              value
                ? true
                : "LlamaIndex Cloud API key is required. You can get it from: https://cloud.llamaindex.ai/api-key",
          },
          handlers,
        );
        program.llamaCloudKey = llamaCloudKey;
      }
    }
  }

  if (program.dataSource?.type === "web" && program.framework === "fastapi") {
    let { baseUrl } = await prompts(
      {
        type: "text",
        name: "baseUrl",
        message: "Please provide base URL of the website:",
        initial: "https://www.llamaindex.ai",
      },
      handlers,
    );
    try {
      if (!baseUrl.includes("://")) {
        baseUrl = `https://${baseUrl}`;
      }
      const checkUrl = new URL(baseUrl);
      if (checkUrl.protocol !== "https:" && checkUrl.protocol !== "http:") {
        throw new Error("Invalid protocol");
      }
    } catch (error) {
      console.log(
        red(
          "Invalid URL provided! Please provide a valid URL (e.g. https://www.llamaindex.ai)",
        ),
      );
      process.exit(1);
    }
    program.dataSource.config = {
      baseUrl: baseUrl,
      depth: 1,
    };
  }

  if (program.engine !== "simple" && !program.vectorDb) {
    if (ciInfo.isCI) {
      program.vectorDb = getPrefOrDefault("vectorDb");
    } else {
      const { vectorDb } = await prompts(
        {
          type: "select",
          name: "vectorDb",
          message: "Would you like to use a vector database?",
          choices: getVectorDbChoices(program.framework),
          initial: 0,
        },
        handlers,
      );
      program.vectorDb = vectorDb;
      preferences.vectorDb = vectorDb;
    }
  }

  if (
    !program.tools &&
    program.framework === "fastapi" &&
    program.engine === "context"
  ) {
    if (ciInfo.isCI) {
      program.tools = getPrefOrDefault("tools");
    } else {
      const toolChoices = supportedTools.map((tool) => ({
        title: tool.display,
        value: tool.name,
      }));
      const { toolsName } = await prompts({
        type: "multiselect",
        name: "toolsName",
        message:
          "Would you like to build an agent using tools? If so, select the tools here, otherwise just press enter",
        choices: toolChoices,
      });
      const tools = toolsName?.map((tool: string) =>
        supportedTools.find((t) => t.name === tool),
      );
      program.tools = tools;
      preferences.tools = tools;
    }
  }

  if (!program.openAiKey) {
    const { key } = await prompts(
      {
        type: "text",
        name: "key",
        message: "Please provide your OpenAI API key (leave blank to skip):",
      },
      handlers,
    );
    program.openAiKey = key;
    preferences.openAiKey = key;
  }

  if (program.framework !== "fastapi" && program.eslint === undefined) {
    if (ciInfo.isCI) {
      program.eslint = getPrefOrDefault("eslint");
    } else {
      const styledEslint = blue("ESLint");
      const { eslint } = await prompts({
        onState: onPromptState,
        type: "toggle",
        name: "eslint",
        message: `Would you like to use ${styledEslint}?`,
        initial: getPrefOrDefault("eslint"),
        active: "Yes",
        inactive: "No",
      });
      program.eslint = Boolean(eslint);
      preferences.eslint = Boolean(eslint);
    }
  }

  await askPostInstallAction();

  // TODO: consider using zod to validate the input (doesn't work like this as not every option is required)
  // templateUISchema.parse(program.ui);
  // templateEngineSchema.parse(program.engine);
  // templateFrameworkSchema.parse(program.framework);
  // templateTypeSchema.parse(program.template);``
};