/**
 * Repository context resolution for Tangled CLI
 * Automatically infers repository context from Git remotes
 */

import { simpleGit } from 'simple-git';
import { isTangledRemote, parseTangledRemote } from '../utils/git.js';
import { promptForRemoteSelection, promptToSaveRemote } from '../utils/prompts.js';
import { getConfiguredRemote, setLocalRemote } from './config.js';

export interface RepositoryContext {
  owner: string; // Owner identifier - DID (e.g., "did:plc:...") or handle (e.g., "markbennett.ca")
  ownerType: 'did' | 'handle'; // Type of owner identifier
  name: string; // Repository name (e.g., "tangled-cli")
  remoteName: string; // Git remote name (e.g., "origin")
  remoteUrl: string; // Full remote URL
  protocol: 'ssh' | 'https'; // Protocol used by remote
}

/**
 * Get all tangled.org remotes from the current Git repository
 *
 * @param cwd - Current working directory
 * @returns Array of repository contexts
 */
export async function getTangledRemotes(cwd: string = process.cwd()): Promise<RepositoryContext[]> {
  try {
    const git = simpleGit(cwd);

    // Check if in a Git repository
    const isRepo = await git.checkIsRepo();
    if (!isRepo) {
      return [];
    }

    // Get all remotes with URLs
    const remotes = await git.getRemotes(true);

    // Filter and parse tangled.org remotes
    const tangledRemotes: RepositoryContext[] = [];

    for (const remote of remotes) {
      if (!remote.refs.fetch || !isTangledRemote(remote.refs.fetch)) {
        continue;
      }

      const parsed = parseTangledRemote(remote.refs.fetch);
      if (!parsed) {
        console.warn(`Warning: Invalid tangled.org remote URL: ${remote.refs.fetch}`);
        continue;
      }

      tangledRemotes.push({
        owner: parsed.owner,
        ownerType: parsed.ownerType,
        name: parsed.name,
        remoteName: remote.name,
        remoteUrl: remote.refs.fetch,
        protocol: parsed.protocol,
      });
    }

    return tangledRemotes;
  } catch {
    // Git errors - return empty array
    return [];
  }
}

/**
 * Prompt user to select a remote when multiple tangled remotes exist
 *
 * @param remotes - Array of repository contexts
 * @returns Selected repository context
 */
export async function promptForRemote(remotes: RepositoryContext[]): Promise<RepositoryContext> {
  if (remotes.length === 0) {
    throw new Error('No remotes available to select from');
  }

  if (remotes.length === 1) {
    return remotes[0];
  }

  // Convert to format expected by prompt
  const remoteChoices = remotes.map((r) => ({
    name: r.remoteName,
    url: r.remoteUrl,
  }));

  const selectedName = await promptForRemoteSelection(remoteChoices);

  const selected = remotes.find((r) => r.remoteName === selectedName);
  if (!selected) {
    throw new Error(`Selected remote "${selectedName}" not found`);
  }

  return selected;
}

/**
 * Get repository context from the current working directory
 * Looks for Git remotes pointing to tangled.org
 *
 * @param cwd - Current working directory (defaults to process.cwd())
 * @returns Repository context or null if not in a tangled repo
 */
export async function getCurrentRepoContext(
  cwd: string = process.cwd()
): Promise<RepositoryContext | null> {
  // Get all tangled remotes
  const remotes = await getTangledRemotes(cwd);

  // No tangled remotes found
  if (remotes.length === 0) {
    return null;
  }

  // Single remote - use it
  if (remotes.length === 1) {
    return remotes[0];
  }

  // Multiple remotes - check config first
  const configuredRemote = await getConfiguredRemote(cwd);

  if (configuredRemote) {
    // Check if configured remote exists and is a tangled remote
    const matchingRemote = remotes.find((r) => r.remoteName === configuredRemote);

    if (matchingRemote) {
      return matchingRemote;
    }

    // Configured remote doesn't exist or isn't a tangled remote
    console.warn(
      `Warning: Configured remote "${configuredRemote}" not found or is not a tangled.org remote. Continuing with heuristics.`
    );
  }

  // Check for "origin" remote
  const originRemote = remotes.find((r) => r.remoteName === 'origin');
  if (originRemote) {
    return originRemote;
  }

  // Prompt user to select
  const selected = await promptForRemote(remotes);

  // Ask if user wants to save selection
  const shouldSave = await promptToSaveRemote();
  if (shouldSave) {
    try {
      await setLocalRemote(selected.remoteName, cwd);
      console.log(`✓ Saved remote "${selected.remoteName}" to local config\n`);
    } catch (error) {
      console.warn(
        `Warning: Failed to save config: ${error instanceof Error ? error.message : 'Unknown error'}`
      );
      // Don't block command execution if config save fails
    }
  }

  return selected;
}