import * as plugins from './mod.plugins.js';
import * as paths from '../paths.js';
import { logger } from '../gitzone.logging.js';

export type ProjectType = 'npm' | 'deno' | 'both' | 'none';
export type VersionType = 'patch' | 'minor' | 'major';

/**
 * Detects the current git branch
 * @returns The current branch name, defaults to 'master' if detection fails
 */
export async function detectCurrentBranch(): Promise<string> {
  try {
    const smartshellInstance = new plugins.smartshell.Smartshell({
      executor: 'bash',
      sourceFilePaths: [],
    });
    const result = await smartshellInstance.exec('git branch --show-current');
    const branchName = result.stdout.trim();

    if (!branchName) {
      logger.log('warn', 'Could not detect current branch, falling back to "master"');
      return 'master';
    }

    logger.log('info', `Detected current branch: ${branchName}`);
    return branchName;
  } catch (error) {
    logger.log('warn', `Failed to detect branch: ${error.message}, falling back to "master"`);
    return 'master';
  }
}

/**
 * Detects the project type based on presence of package.json and/or deno.json
 * @returns The project type
 */
export async function detectProjectType(): Promise<ProjectType> {
  const packageJsonPath = plugins.path.join(paths.cwd, 'package.json');
  const denoJsonPath = plugins.path.join(paths.cwd, 'deno.json');

  const hasPackageJson = await plugins.smartfile.fs.fileExists(packageJsonPath);
  const hasDenoJson = await plugins.smartfile.fs.fileExists(denoJsonPath);

  if (hasPackageJson && hasDenoJson) {
    logger.log('info', 'Detected dual project (npm + deno)');
    return 'both';
  } else if (hasPackageJson) {
    logger.log('info', 'Detected npm project');
    return 'npm';
  } else if (hasDenoJson) {
    logger.log('info', 'Detected deno project');
    return 'deno';
  } else {
    throw new Error('No package.json or deno.json found in current directory');
  }
}

/**
 * Parses a semantic version string and bumps it according to the version type
 * @param currentVersion Current version string (e.g., "1.2.3")
 * @param versionType Type of version bump
 * @returns New version string
 */
function calculateNewVersion(currentVersion: string, versionType: VersionType): string {
  const versionMatch = currentVersion.match(/^(\d+)\.(\d+)\.(\d+)/);

  if (!versionMatch) {
    throw new Error(`Invalid version format: ${currentVersion}`);
  }

  let [, major, minor, patch] = versionMatch.map(Number);

  switch (versionType) {
    case 'major':
      major += 1;
      minor = 0;
      patch = 0;
      break;
    case 'minor':
      minor += 1;
      patch = 0;
      break;
    case 'patch':
      patch += 1;
      break;
  }

  return `${major}.${minor}.${patch}`;
}

/**
 * Bumps the version in deno.json
 * @param versionType Type of version bump
 * @returns The new version string
 */
export async function bumpDenoVersion(versionType: VersionType): Promise<string> {
  const denoJsonPath = plugins.path.join(paths.cwd, 'deno.json');

  try {
    // Read deno.json
    const denoConfig = plugins.smartfile.fs.toObjectSync(
      denoJsonPath
    ) as { version?: string };

    if (!denoConfig.version) {
      throw new Error('deno.json does not contain a version field');
    }

    const currentVersion = denoConfig.version;
    const newVersion = calculateNewVersion(currentVersion, versionType);

    logger.log('info', `Bumping deno.json version: ${currentVersion} → ${newVersion}`);

    // Update version
    denoConfig.version = newVersion;

    // Write back to disk
    await plugins.smartfile.memory.toFs(
      JSON.stringify(denoConfig, null, 2) + '\n',
      denoJsonPath
    );

    return newVersion;
  } catch (error) {
    throw new Error(`Failed to bump deno.json version: ${error.message}`);
  }
}

/**
 * Bumps the version in package.json using npm version command
 * @param versionType Type of version bump
 * @returns The new version string
 */
async function bumpNpmVersion(versionType: VersionType): Promise<string> {
  const smartshellInstance = new plugins.smartshell.Smartshell({
    executor: 'bash',
    sourceFilePaths: [],
  });

  logger.log('info', `Bumping package.json version using npm version ${versionType}`);
  const result = await smartshellInstance.exec(`npm version ${versionType}`);

  // npm version returns the new version with a 'v' prefix, e.g., "v1.2.3"
  const newVersion = result.stdout.trim().replace(/^v/, '');
  return newVersion;
}

/**
 * Syncs the version from package.json to deno.json
 * @param version The version to sync
 */
async function syncVersionToDenoJson(version: string): Promise<void> {
  const denoJsonPath = plugins.path.join(paths.cwd, 'deno.json');

  try {
    const denoConfig = plugins.smartfile.fs.toObjectSync(
      denoJsonPath
    ) as { version?: string };

    logger.log('info', `Syncing version to deno.json: ${version}`);
    denoConfig.version = version;

    await plugins.smartfile.memory.toFs(
      JSON.stringify(denoConfig, null, 2) + '\n',
      denoJsonPath
    );
  } catch (error) {
    throw new Error(`Failed to sync version to deno.json: ${error.message}`);
  }
}

/**
 * Bumps the project version based on project type
 * @param projectType The detected project type
 * @param versionType The type of version bump
 * @returns The new version string
 */
export async function bumpProjectVersion(
  projectType: ProjectType,
  versionType: VersionType
): Promise<string> {
  switch (projectType) {
    case 'npm':
      return await bumpNpmVersion(versionType);

    case 'deno':
      return await bumpDenoVersion(versionType);

    case 'both': {
      // Bump npm version first (it handles git tags)
      const newVersion = await bumpNpmVersion(versionType);
      // Then sync to deno.json
      await syncVersionToDenoJson(newVersion);
      return newVersion;
    }

    case 'none':
      throw new Error('Cannot bump version: no package.json or deno.json found');

    default:
      throw new Error(`Unknown project type: ${projectType}`);
  }
}