import type { APIRoute } from "astro";
import { db, organizations, repositories, configs } from "@/lib/db";
import { eq } from "drizzle-orm";
import { v4 as uuidv4 } from "uuid";
import { createMirrorJob } from "@/lib/helpers";
import {
  createGitHubClient,
  getGithubOrganizations,
  getGithubRepositories,
  getGithubStarredRepositories,
} from "@/lib/github";
import { jsonResponse, createSecureErrorResponse } from "@/lib/utils";

export const POST: APIRoute = async ({ request }) => {
  const url = new URL(request.url);
  const userId = url.searchParams.get("userId");

  if (!userId) {
    return jsonResponse({ data: { error: "Missing userId" }, status: 400 });
  }

  try {
    const [config] = await db
      .select()
      .from(configs)
      .where(eq(configs.userId, userId))
      .limit(1);

    if (!config) {
      return jsonResponse({
        data: { error: "No configuration found for this user" },
        status: 404,
      });
    }

    const token = config.githubConfig?.token;

    if (!token) {
      return jsonResponse({
        data: { error: "GitHub token is missing in config" },
        status: 400,
      });
    }

    const octokit = createGitHubClient(token);

    // Fetch GitHub data in parallel
    const [basicAndForkedRepos, starredRepos, gitOrgs] = await Promise.all([
      getGithubRepositories({ octokit, config }),
      config.githubConfig?.mirrorStarred
        ? getGithubStarredRepositories({ octokit, config })
        : Promise.resolve([]),
      getGithubOrganizations({ octokit, config }),
    ]);

    const allGithubRepos = [...basicAndForkedRepos, ...starredRepos];

    // Prepare full list of repos and orgs
    const newRepos = allGithubRepos.map((repo) => ({
      id: uuidv4(),
      userId,
      configId: config.id,
      name: repo.name,
      fullName: repo.fullName,
      url: repo.url,
      cloneUrl: repo.cloneUrl,
      owner: repo.owner,
      organization: repo.organization,
      isPrivate: repo.isPrivate,
      isForked: repo.isForked,
      forkedFrom: repo.forkedFrom,
      hasIssues: repo.hasIssues,
      isStarred: repo.isStarred,
      isArchived: repo.isArchived,
      size: repo.size,
      hasLFS: repo.hasLFS,
      hasSubmodules: repo.hasSubmodules,
      defaultBranch: repo.defaultBranch,
      visibility: repo.visibility,
      status: repo.status,
      lastMirrored: repo.lastMirrored,
      errorMessage: repo.errorMessage,
      createdAt: repo.createdAt,
      updatedAt: repo.updatedAt,
    }));

    const newOrgs = gitOrgs.map((org) => ({
      id: uuidv4(),
      userId,
      configId: config.id,
      name: org.name,
      avatarUrl: org.avatarUrl,
      membershipRole: org.membershipRole,
      isIncluded: false,
      status: org.status,
      repositoryCount: org.repositoryCount,
      createdAt: new Date(),
      updatedAt: new Date(),
    }));

    let insertedRepos: typeof newRepos = [];
    let insertedOrgs: typeof newOrgs = [];

    // Transaction to insert only new items
    await db.transaction(async (tx) => {
      const [existingRepos, existingOrgs] = await Promise.all([
        tx
          .select({ fullName: repositories.fullName })
          .from(repositories)
          .where(eq(repositories.userId, userId)),
        tx
          .select({ name: organizations.name })
          .from(organizations)
          .where(eq(organizations.userId, userId)),
      ]);

      const existingRepoNames = new Set(existingRepos.map((r) => r.fullName));
      const existingOrgNames = new Set(existingOrgs.map((o) => o.name));

      insertedRepos = newRepos.filter(
        (r) => !existingRepoNames.has(r.fullName)
      );
      insertedOrgs = newOrgs.filter((o) => !existingOrgNames.has(o.name));

      if (insertedRepos.length > 0) {
        await tx.insert(repositories).values(insertedRepos);
      }

      if (insertedOrgs.length > 0) {
        await tx.insert(organizations).values(insertedOrgs);
      }
    });

    // Create mirror jobs only for newly inserted items
    const mirrorJobPromises = [
      ...insertedRepos.map((repo) =>
        createMirrorJob({
          userId,
          repositoryId: repo.id,
          repositoryName: repo.name,
          status: "imported",
          message: `Repository ${repo.name} fetched successfully`,
          details: `Repository ${repo.name} was fetched from GitHub`,
        })
      ),
      ...insertedOrgs.map((org) =>
        createMirrorJob({
          userId,
          organizationId: org.id,
          organizationName: org.name,
          status: "imported",
          message: `Organization ${org.name} fetched successfully`,
          details: `Organization ${org.name} was fetched from GitHub`,
        })
      ),
    ];

    await Promise.all(mirrorJobPromises);

    return jsonResponse({
      data: {
        success: true,
        message: "Repositories and organizations synced successfully",
        newRepositories: insertedRepos.length,
        newOrganizations: insertedOrgs.length,
      },
    });
  } catch (error) {
    return createSecureErrorResponse(error, "GitHub data sync", 500);
  }
};