import type { APIRoute } from "astro";
import { Octokit } from "@octokit/rest";
import { configs, db, organizations, repositories } from "@/lib/db";
import { and, eq } from "drizzle-orm";
import { jsonResponse, createSecureErrorResponse } from "@/lib/utils";
import type {
  AddOrganizationApiRequest,
  AddOrganizationApiResponse,
} from "@/types/organizations";
import type { RepositoryVisibility, RepoStatus } from "@/types/Repository";
import { v4 as uuidv4 } from "uuid";
import { decryptConfigTokens } from "@/lib/utils/config-encryption";
import { createGitHubClient } from "@/lib/github";

export const POST: APIRoute = async ({ request }) => {
  try {
    const body: AddOrganizationApiRequest = await request.json();
    const { role, org, userId } = body;

    if (!org || !userId || !role) {
      return jsonResponse({
        data: { success: false, error: "Missing org, role or userId" },
        status: 400,
      });
    }

    // Check if org already exists
    const existingOrg = await db
      .select()
      .from(organizations)
      .where(
        and(eq(organizations.name, org), eq(organizations.userId, userId))
      );

    if (existingOrg.length > 0) {
      return jsonResponse({
        data: {
          success: false,
          error: "Organization already exists for this user",
        },
        status: 400,
      });
    }

    // Get user's config
    const [config] = await db
      .select()
      .from(configs)
      .where(and(eq(configs.userId, userId), eq(configs.isActive, true)))
      .limit(1);

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

    const configId = config.id;
    
    // Decrypt the config to get tokens
    const decryptedConfig = decryptConfigTokens(config);
    
    // Check if we have a GitHub token
    if (!decryptedConfig.githubConfig?.token) {
      return jsonResponse({
        data: { error: "GitHub token not configured" },
        status: 401,
      });
    }
    
    // Create authenticated Octokit instance with rate limit tracking
    const githubUsername = decryptedConfig.githubConfig?.owner || undefined;
    const octokit = createGitHubClient(decryptedConfig.githubConfig.token, userId, githubUsername);

    // Fetch org metadata
    const { data: orgData } = await octokit.orgs.get({ org });

    // Fetch repos based on config settings
    const allRepos = [];
    
    // Fetch all repos (public, private, and member) to show in UI
    const publicRepos = await octokit.paginate(octokit.repos.listForOrg, {
      org,
      type: "public",
      per_page: 100,
    });
    allRepos.push(...publicRepos);
    
    // Always fetch private repos to show them in the UI
    const privateRepos = await octokit.paginate(octokit.repos.listForOrg, {
      org,
      type: "private",
      per_page: 100,
    });
    allRepos.push(...privateRepos);
    
    // Also fetch member repos (includes private repos the user has access to)
    const memberRepos = await octokit.paginate(octokit.repos.listForOrg, {
      org,
      type: "member",
      per_page: 100,
    });
    // Filter out duplicates
    const existingIds = new Set(allRepos.map(r => r.id));
    const uniqueMemberRepos = memberRepos.filter(r => !existingIds.has(r.id));
    allRepos.push(...uniqueMemberRepos);

    // Insert repositories
    const repoRecords = allRepos.map((repo) => ({
      id: uuidv4(),
      userId,
      configId,
      name: repo.name,
      fullName: repo.full_name,
      url: repo.html_url,
      cloneUrl: repo.clone_url ?? "",
      owner: repo.owner.login,
      organization:
        repo.owner.type === "Organization" ? repo.owner.login : null,
      mirroredLocation: "",
      destinationOrg: null,
      isPrivate: repo.private,
      isForked: repo.fork,
      forkedFrom: null,
      hasIssues: repo.has_issues,
      isStarred: false,
      isArchived: repo.archived,
      size: repo.size,
      hasLFS: false,
      hasSubmodules: false,
      language: repo.language ?? null,
      description: repo.description ?? null,
      defaultBranch: repo.default_branch ?? "main",
      visibility: (repo.visibility ?? "public") as RepositoryVisibility,
      status: "imported" as RepoStatus,
      lastMirrored: null,
      errorMessage: null,
      createdAt: repo.created_at ? new Date(repo.created_at) : new Date(),
      updatedAt: repo.updated_at ? new Date(repo.updated_at) : new Date(),
    }));

    // Batch insert repositories to avoid SQLite parameter limit
    // Compute batch size based on column count
    const sample = repoRecords[0];
    const columnCount = Object.keys(sample ?? {}).length || 1;
    const BATCH_SIZE = Math.max(1, Math.floor(999 / columnCount));
    for (let i = 0; i < repoRecords.length; i += BATCH_SIZE) {
      const batch = repoRecords.slice(i, i + BATCH_SIZE);
      await db
        .insert(repositories)
        .values(batch)
        .onConflictDoNothing({ target: [repositories.userId, repositories.fullName] });
    }

    // Insert organization metadata
    const organizationRecord = {
      id: uuidv4(),
      userId,
      configId,
      name: orgData.login,
      avatarUrl: orgData.avatar_url,
      membershipRole: role,
      isIncluded: false,
      status: "imported" as RepoStatus,
      repositoryCount: allRepos.length,
      createdAt: orgData.created_at ? new Date(orgData.created_at) : new Date(),
      updatedAt: orgData.updated_at ? new Date(orgData.updated_at) : new Date(),
    };

    await db.insert(organizations).values(organizationRecord);

    const resPayload: AddOrganizationApiResponse = {
      success: true,
      organization: organizationRecord,
      message: "Organization and repositories imported successfully",
    };

    return jsonResponse({ data: resPayload, status: 200 });
  } catch (error) {
    return createSecureErrorResponse(error, "organization sync", 500);
  }
};