import { parseArgs } from "@std/cli/parse-args";
import { join, dirname } from "@std/path";
import { ensureDir } from "@std/fs";
import { cyan, green, bold, dim } from "@std/fmt/colors";
import { logger } from "../utils/logger.ts";
import { getTemplatesForName, AVAILABLE_TEMPLATES } from "../templates/embedded.ts";
import { generateSliceName, generateDomain } from "../utils/name_generator.ts";
import { createAuthenticatedClient } from "../utils/client.ts";
import { ConfigManager } from "../auth/config.ts";
import { pullCommand } from "./lexicon/pull.ts";
import { pushCommand } from "./lexicon/push.ts";
import { codegenCommand } from "./codegen.ts";
import { dasherize } from "../utils/strings.ts";
import {
  SYSTEM_SLICE_URI,
  REFERENCE_SLICE_URI,
  DEFAULT_API_URL,
  DEFAULT_AIP_BASE_URL,
} from "../utils/constants.ts";

export async function initCommand(args: string[], _globalArgs: unknown) {
  const parsed = parseArgs(args, {
    string: ["name", "template"],
    boolean: ["help"],
    alias: {
      n: "name",
      h: "help",
      t: "template",
    },
    default: {
      template: "deno-ssr",
    },
  });

  if (parsed.help) {
    showInitHelp();
    return;
  }

  // Validate template name
  const templateName = parsed.template as string;
  if (!AVAILABLE_TEMPLATES.includes(templateName)) {
    logger.error(`Invalid template: ${templateName}`);
    logger.info(`Available templates: ${AVAILABLE_TEMPLATES.join(", ")}`);
    Deno.exit(1);
  }

  // Check if we're inside an existing project
  const currentDir = Deno.cwd();
  const projectIndicators = ["deno.json", "slices.json", ".git"];

  for (const indicator of projectIndicators) {
    try {
      await Deno.stat(join(currentDir, indicator));
      logger.error(
        `Cannot initialize a new project here - found ${indicator} in current directory.`
      );
      logger.info(
        "Please run this command from outside your project directory."
      );
      Deno.exit(1);
    } catch {
      // File doesn't exist, which is what we want
    }
  }

  let projectName = parsed.name || (parsed._[0] as string);
  let wasNameGenerated = false;

  // If no project name provided, generate a random one
  if (!projectName) {
    projectName = generateSliceName();
    wasNameGenerated = true;

    console.log(
      `\n${cyan("📦 No project name provided, generated one for you:")}`
    );
    console.log(`   Project name: ${bold(projectName)}`);

    // Ask for confirmation
    const proceed = confirm("\nDo you want to proceed with this name?");
    if (!proceed) {
      logger.info(
        "Initialization cancelled. Run 'slices init <project-name>' to specify your own name."
      );
      return;
    }
  } else {
    // Dasherize user-provided name
    projectName = dasherize(projectName);
  }

  // Validate project name
  if (!/^[a-zA-Z0-9_-]+$/.test(projectName)) {
    logger.error(
      "Project name can only contain letters, numbers, hyphens, and underscores"
    );
    Deno.exit(1);
  }

  const targetDir = join(Deno.cwd(), projectName);

  // Check if directory already exists
  try {
    const stat = await Deno.stat(targetDir);
    if (stat.isDirectory) {
      logger.error(`Directory '${projectName}' already exists`);
      Deno.exit(1);
    }
  } catch {
    // Directory doesn't exist, which is what we want
  }

  logger.info(`Creating project: ${projectName}`);

  // Try to create a slice with the same name
  let sliceUri: string | undefined;
  let sliceDomain: string | undefined;
  let oauthClientId: string | undefined;
  let oauthClientSecret: string | undefined;
  let oauthRedirectUri: string | undefined;
  const config = new ConfigManager();
  await config.load();

  if (config.isAuthenticated()) {
    try {
      // If we generated the name, use it for the domain too
      // Otherwise, prompt for domain
      if (wasNameGenerated) {
        sliceDomain = `network.slices.${projectName}`;
      } else {
        // User provided a name, ask for domain
        console.log(`\n${cyan("🌐 Setting up your slice domain:")}`);
        console.log(
          `   ${dim("Format: com.example (reverse domain notation)")}`
        );
        console.log(`   ${dim("Leave blank to generate one automatically")}`);

        const userDomain = prompt(
          "\nEnter your domain (or press Enter to generate):"
        );

        if (userDomain && userDomain.trim()) {
          // Validate domain format (basic check for at least one dot)
          if (!userDomain.includes(".")) {
            logger.error(
              "Domain must contain at least one dot (e.g., com.example)"
            );
            Deno.exit(1);
          }
          sliceDomain = userDomain.trim();
        } else {
          // Generate a domain
          sliceDomain = generateDomain();
          console.log(`   Generated domain: ${bold(sliceDomain)}`);
        }
      }

      console.log(`\n${cyan("🌐 Creating a slice on the Slices network:")}`);
      console.log(`   Slice name: ${bold(projectName)}`);
      console.log(`   Domain: ${bold(sliceDomain)}`);
      console.log(
        `   ${dim("This will be your unique namespace for collections")}`
      );

      const createSlice = confirm("\nCreate this slice?");
      if (!createSlice) {
        logger.info(
          "Skipping slice creation. You can create one later at https://slices.network"
        );
      } else {
        logger.info("Creating slice...");
        const client = await createAuthenticatedClient(
          SYSTEM_SLICE_URI,
          DEFAULT_API_URL
        );

        // Check if domain already exists in the system slice
        const existingSlices = await client.network.slices.slice.getRecords({
          where: { domain: { eq: sliceDomain } },
          limit: 1,
        });

        if (existingSlices.records.length > 0) {
          logger.error(`A slice with domain '${sliceDomain}' already exists`);
          logger.info("Please try again with a different name or domain");
          Deno.exit(1);
        }

        const result = await client.network.slices.slice.createRecord({
          name: projectName,
          domain: sliceDomain,
          createdAt: new Date().toISOString(),
        });

        sliceUri = result.uri;
        logger.success(`Created slice: ${sliceUri}`);

        // Ask if they want to create OAuth client
        const createOAuth = confirm(
          "\nWould you like to create OAuth credentials for this slice?"
        );
        if (createOAuth) {
          logger.info("Creating OAuth client...");

          // Default redirect URI for local development
          const redirectUri = "http://localhost:8080/oauth/callback";

          try {
            const oauthResult =
              await client.network.slices.slice.createOAuthClient({
                sliceUri: sliceUri,
                clientName: `${projectName} Development`,
                redirectUris: [redirectUri],
                grantTypes: ["authorization_code", "refresh_token"],
                responseTypes: ["code"],
                scope: "profile openid atproto transition:generic",
              });

            // Store OAuth credentials to add to .env later
            oauthClientId = oauthResult.clientId;
            oauthClientSecret = oauthResult.clientSecret;
            oauthRedirectUri = redirectUri;

            logger.success("Created OAuth client!");
            console.log(`  Client ID: ${cyan(oauthResult.clientId)}`);
            console.log(
              `  ${dim("Client secret will be added to your .env file")}`
            );
          } catch (oauthError) {
            const err = oauthError as Error;
            logger.warn(`Could not create OAuth client: ${err.message}`);
            logger.info(
              "You can create OAuth credentials later at https://slices.network"
            );
          }
        }
      }
    } catch (error) {
      const err = error as Error;
      logger.warn(`Could not create slice: ${err.message}`);
      logger.info("You can create a slice later at https://slices.network");
    }
  } else {
    logger.info("Not authenticated - skipping slice creation");
    logger.info(
      "Run 'slices login' to authenticate, then create a slice at https://slices.network"
    );
  }

  try {
    // Create target directory
    await ensureDir(targetDir);

    // Extract embedded templates
    await extractEmbeddedTemplates(targetDir, projectName, templateName);

    // Update .env.example with slice URI if we created one
    if (sliceUri) {
      const envExamplePath = join(targetDir, ".env.example");
      try {
        let envContent = await Deno.readTextFile(envExamplePath);
        envContent = envContent.replace(
          /SLICE_URI=.*/,
          `SLICE_URI="${sliceUri}"`
        );
        await Deno.writeTextFile(envExamplePath, envContent);
      } catch {
        // Ignore if can't update .env.example
      }
    }

    // Create .env file with OAuth credentials if we have them
    if (oauthClientId && oauthClientSecret) {
      const envPath = join(targetDir, ".env");
      const envExamplePath = join(targetDir, ".env.example");

      try {
        // Read the example file as a template
        let envContent = await Deno.readTextFile(envExamplePath);

        // Replace with actual values
        if (sliceUri) {
          envContent = envContent.replace(
            /SLICE_URI=.*/,
            `SLICE_URI="${sliceUri}"`
          );
        }
        envContent = envContent.replace(
          /OAUTH_CLIENT_ID=.*/,
          `OAUTH_CLIENT_ID="${oauthClientId}"`
        );
        envContent = envContent.replace(
          /OAUTH_CLIENT_SECRET=.*/,
          `OAUTH_CLIENT_SECRET="${oauthClientSecret}"`
        );
        envContent = envContent.replace(
          /OAUTH_REDIRECT_URI=.*/,
          `OAUTH_REDIRECT_URI="${oauthRedirectUri}"`
        );
        envContent = envContent.replace(
          /OAUTH_AIP_BASE_URL=.*/,
          `OAUTH_AIP_BASE_URL="${DEFAULT_AIP_BASE_URL}"`
        );
        envContent = envContent.replace(
          /API_URL=.*/,
          `API_URL="${DEFAULT_API_URL}"`
        );

        // Write the actual .env file
        await Deno.writeTextFile(envPath, envContent);
        logger.success("Created .env file with your OAuth credentials");
      } catch (error) {
        const err = error as Error;
        logger.warn(`Could not create .env file: ${err.message}`);
      }
    }

    // Create slices.json file with actual slice URI
    if (sliceUri) {
      const slicesJsonPath = join(targetDir, "slices.json");
      const slicesConfig = {
        slice: sliceUri,
        lexiconPath: "./lexicons",
        clientOutputPath: "./src/generated_client.ts",
      };

      try {
        await Deno.writeTextFile(
          slicesJsonPath,
          JSON.stringify(slicesConfig, null, 2) + "\n"
        );
        logger.success("Created slices.json with your slice configuration");
      } catch (error) {
        const err = error as Error;
        logger.warn(`Could not create slices.json file: ${err.message}`);
      }
    }

    // Pull lexicons from the base slice w/ Bsky Profile Lexicons
    try {
      logger.info("Pulling base lexicons...");

      // Change to the project directory and run pull
      const originalCwd = Deno.cwd();
      Deno.chdir(targetDir);

      // Pull from the base Slices platform slice which has all the proper lexicons
      await pullCommand(["--slice", REFERENCE_SLICE_URI], {});

      logger.success("Pulled base lexicons");

      // If we created a slice, push the lexicons to it
      if (sliceUri) {
        logger.info("Pushing lexicons to your slice...");
        await pushCommand([], {});
        logger.success("Pushed lexicons to your slice");
      }

      // Generate TypeScript client from lexicons
      logger.info("Generating TypeScript client...");
      await codegenCommand([], {});
      logger.success("Generated TypeScript client");

      // Change back to original directory
      Deno.chdir(originalCwd);
    } catch (error) {
      const err = error as Error;
      logger.warn(`Could not pull lexicons: ${err.message}`);

      // Create empty lexicons folder as fallback
      const lexiconsPath = join(targetDir, "lexicons");
      try {
        await ensureDir(lexiconsPath);
        await Deno.writeTextFile(join(lexiconsPath, ".gitkeep"), "");
      } catch {
        // Ignore if we can't create the folder
      }
    }

    // Initialize git repository
    try {
      const gitInit = new Deno.Command("git", {
        args: ["init"],
        cwd: targetDir,
        stdout: "piped",
        stderr: "piped",
      });

      const result = await gitInit.output();
      if (result.success) {
        logger.success("Initialized git repository");
      } else {
        const stderr = new TextDecoder().decode(result.stderr);
        logger.warn(`Could not initialize git repository: ${stderr}`);
      }
    } catch (error) {
      const err = error as Error;
      logger.warn(`Could not initialize git repository: ${err.message}`);
    }

    logger.success(`Created project: ${projectName}`);

    console.log(`\n${green("✨ Your project is ready!")}\n`);
    console.log(`${bold("Next steps:")}`);
    console.log(`  1. cd ${cyan(projectName)}`);
    if (oauthClientId && oauthClientSecret) {
      console.log(`  2. deno task dev`);
      console.log(`  ${dim("   Your .env file is already configured!")}`);
    } else {
      console.log(`  2. cp .env.example .env`);
      console.log(`  3. ${dim("# Add your OAuth credentials to .env")}`);
      console.log(`  4. deno task dev`);
    }

    if (sliceUri && sliceDomain) {
      console.log(`\n${bold("Your slice details:")}`);
      console.log(`  Name: ${cyan(projectName)}`);
      console.log(`  Domain: ${cyan(sliceDomain)}`);
      console.log(`  URI: ${dim(sliceUri)}`);
    }

    console.log(`\n${bold("Available commands:")}`);
    console.log(`  ${cyan("deno task dev")}     Start development server`);
    console.log(`  ${cyan("deno task start")}   Start production server`);
    console.log(`  ${cyan("deno fmt")}          Format code`);
  } catch (error) {
    const err = error as Error;
    logger.error("Failed to create project:", err.message);
    Deno.exit(1);
  }
}

async function extractEmbeddedTemplates(
  targetDir: string,
  projectName: string,
  templateName: string
) {
  try {
    const templates = getTemplatesForName(templateName);

    if (templates.size === 0) {
      throw new Error(`No templates found for: ${templateName}`);
    }

    for (const [relativePath, content] of templates.entries()) {
      const fullPath = join(targetDir, relativePath);
      const dir = dirname(fullPath);

      // Ensure directory exists
      await ensureDir(dir);

      // Write file
      await Deno.writeFile(fullPath, content);
    }

    // Process template files for variable replacement
    await processTemplateFiles(targetDir, projectName);

    logger.info(`Template files extracted and processed (${templateName})`);
  } catch (error) {
    const err = error as Error;
    logger.error("Failed to extract templates:", err.message);
    throw error;
  }
}

async function processTemplateFiles(targetDir: string, projectName: string) {
  // Process files that need variable replacement
  const filesToProcess = ["README.md", "src/config.ts"];

  for (const file of filesToProcess) {
    const filePath = join(targetDir, file);
    try {
      const content = await Deno.readTextFile(filePath);
      const processed = content.replace(/{{PROJECT_NAME}}/g, projectName);
      await Deno.writeTextFile(filePath, processed);
    } catch (error) {
      const err = error as Error;
      logger.warn(`Could not process template file ${file}:`, err.message);
    }
  }
}

function showInitHelp() {
  console.log(`
Initialize a new Deno project with OAuth authentication

USAGE:
    slices init <project-name>              Create project with specified name
    slices init                             Create project with random generated name
    slices init --name <name>               Create project with specified name
    slices init --template <template-name>  Specify template to use

ARGUMENTS:
    <project-name>    Name of the project to create (optional)

OPTIONS:
    -n, --name <name>        Project name
    -t, --template <name>    Template to use (default: deno-ssr)
                             Available: ${AVAILABLE_TEMPLATES.join(", ")}
    -h, --help              Show this help message

EXAMPLES:
    slices init my-app    Creates "my-app" project with deno-ssr template
    slices init           Creates project with random name

FEATURES:
    • Automatically creates a matching slice (if authenticated)
    • Generates domain in format: network.slices.<project-name>
    • Updates .env.example with slice URI
    • Deno SSR with Preact and JSX
    • OAuth authentication with PKCE flow
    • Session management with SQLite
    • HTMX for interactive components
    • Tailwind CSS for styling
    • Feature-based architecture
`);
}