import { describe, test, expect, mock, beforeEach, afterEach } from "bun:test";
import { db, repositories } from "./db";
import { eq } from "drizzle-orm";
import { repoStatusEnum } from "@/types/Repository";
import type { Config, Repository } from "./db/schema";

describe("Mirror Sync Error Handling", () => {
  let originalFetch: typeof global.fetch;
  let originalSetTimeout: typeof global.setTimeout;
  let mockDbUpdate: any;

  beforeEach(() => {
    originalFetch = global.fetch;
    originalSetTimeout = global.setTimeout;
    
    // Mock setTimeout to avoid delays in tests
    global.setTimeout = ((fn: Function) => {
      Promise.resolve().then(() => fn());
      return 0;
    }) as any;
    
    // Mock database update operations
    mockDbUpdate = mock(() => ({
      set: mock(() => ({
        where: mock(() => Promise.resolve())
      }))
    }));
    
    // Override the db.update method
    (db as any).update = mockDbUpdate;
  });

  afterEach(() => {
    global.fetch = originalFetch;
    global.setTimeout = originalSetTimeout;
  });

  describe("Mirror sync API errors", () => {
    test("should handle mirror-sync endpoint not available for non-mirror repos", async () => {
      const errorResponse = {
        ok: false,
        status: 400,
        statusText: "Bad Request",
        headers: new Headers({ "content-type": "application/json" }),
        json: async () => ({
          message: "Repository is not a mirror",
          url: "https://gitea.ui.com/api/swagger"
        })
      };

      global.fetch = mock(async (url: string) => {
        if (url.includes("/api/v1/repos/") && url.includes("/mirror-sync")) {
          return errorResponse as Response;
        }
        return originalFetch(url);
      });

      const config: Partial<Config> = {
        giteaConfig: {
          url: "https://gitea.ui.com",
          token: "gitea-token"
        }
      };

      // Simulate attempting to sync a non-mirror repository
      const response = await fetch(
        `${config.giteaConfig!.url}/api/v1/repos/starred/test-repo/mirror-sync`,
        {
          method: "POST",
          headers: {
            Authorization: `token ${config.giteaConfig!.token}`,
            "Content-Type": "application/json"
          }
        }
      );

      expect(response.ok).toBe(false);
      expect(response.status).toBe(400);
      
      const error = await response.json();
      expect(error.message).toBe("Repository is not a mirror");
    });

    test("should update repository status to 'failed' when sync fails", async () => {
      const repository: Repository = {
        id: "repo-123",
        userId: "user-123",
        configId: "config-123",
        name: "test-repo",
        fullName: "owner/test-repo",
        url: "https://github.com/owner/test-repo",
        cloneUrl: "https://github.com/owner/test-repo.git",
        owner: "owner",
        isPrivate: false,
        isForked: false,
        hasIssues: true,
        isStarred: true,
        isArchived: false,
        size: 1000,
        hasLFS: false,
        hasSubmodules: false,
        defaultBranch: "main",
        visibility: "public",
        status: "mirroring",
        mirroredLocation: "starred/test-repo",
        createdAt: new Date(),
        updatedAt: new Date()
      };

      // Simulate error handling in mirror process
      const errorMessage = "Repository is not a mirror";
      
      // This simulates what should happen when mirror sync fails
      await db
        .update(repositories)
        .set({
          status: repoStatusEnum.parse("failed"),
          errorMessage: errorMessage,
          updatedAt: new Date()
        })
        .where(eq(repositories.id, repository.id));

      // Verify the update was called with correct parameters
      expect(mockDbUpdate).toHaveBeenCalledWith(repositories);
      
      const setCalls = mockDbUpdate.mock.results[0].value.set.mock.calls;
      expect(setCalls[0][0]).toMatchObject({
        status: "failed",
        errorMessage: errorMessage
      });
    });
  });

  describe("Repository state detection", () => {
    test("should detect when a repository exists but is not configured as mirror", async () => {
      // Mock Gitea API response for repo info
      global.fetch = mock(async (url: string) => {
        if (url.includes("/api/v1/repos/starred/test-repo") && !url.includes("mirror-sync")) {
          return {
            ok: true,
            status: 200,
            headers: new Headers({ "content-type": "application/json" }),
            json: async () => ({
              id: 123,
              name: "test-repo",
              owner: { login: "starred" },
              mirror: false, // This is the issue - should be true
              fork: false,
              private: false,
              clone_url: "https://gitea.ui.com/starred/test-repo.git"
            })
          } as Response;
        }
        return originalFetch(url);
      });

      const config: Partial<Config> = {
        giteaConfig: {
          url: "https://gitea.ui.com",
          token: "gitea-token"
        }
      };

      // Check repository details
      const response = await fetch(
        `${config.giteaConfig!.url}/api/v1/repos/starred/test-repo`,
        {
          headers: {
            Authorization: `token ${config.giteaConfig!.token}`
          }
        }
      );

      const repoInfo = await response.json();
      
      // Verify the repository exists but is not a mirror
      expect(repoInfo.mirror).toBe(false);
      expect(repoInfo.owner.login).toBe("starred");
      
      // This state causes the "Repository is not a mirror" error
    });

    test("should identify repositories that need to be recreated as mirrors", async () => {
      const problematicRepos = [
        {
          name: "awesome-project",
          owner: "starred",
          currentState: "regular",
          requiredState: "mirror",
          action: "delete and recreate"
        },
        {
          name: "cool-library",
          owner: "starred", 
          currentState: "fork",
          requiredState: "mirror",
          action: "delete and recreate"
        }
      ];

      // This test documents repos that need intervention
      expect(problematicRepos).toHaveLength(2);
      expect(problematicRepos[0].action).toBe("delete and recreate");
    });
  });

  describe("Organization permission errors", () => {
    test("should handle insufficient permissions for organization operations", async () => {
      global.fetch = mock(async (url: string, options?: RequestInit) => {
        if (url.includes("/api/v1/orgs") && options?.method === "POST") {
          return {
            ok: false,
            status: 403,
            statusText: "Forbidden",
            headers: new Headers({ "content-type": "application/json" }),
            json: async () => ({
              message: "You do not have permission to create organizations",
              url: "https://gitea.ui.com/api/swagger"
            })
          } as Response;
        }
        return originalFetch(url, options);
      });

      const config: Partial<Config> = {
        giteaConfig: {
          url: "https://gitea.ui.com",
          token: "gitea-token"
        }
      };

      const response = await fetch(
        `${config.giteaConfig!.url}/api/v1/orgs`,
        {
          method: "POST",
          headers: {
            Authorization: `token ${config.giteaConfig!.token}`,
            "Content-Type": "application/json"
          },
          body: JSON.stringify({
            username: "starred",
            full_name: "Starred Repositories"
          })
        }
      );

      expect(response.ok).toBe(false);
      expect(response.status).toBe(403);
      
      const error = await response.json();
      expect(error.message).toContain("permission");
    });
  });

  describe("Sync operation retry logic", () => {
    test("should implement exponential backoff for transient errors", async () => {
      let attemptCount = 0;
      const maxRetries = 3;
      const baseDelay = 1000;

      const mockSyncWithRetry = async (url: string, config: any) => {
        for (let i = 0; i < maxRetries; i++) {
          attemptCount++;
          
          try {
            const response = await fetch(url, {
              method: "POST",
              headers: {
                Authorization: `token ${config.token}`
              }
            });

            if (response.ok) {
              return response;
            }

            if (response.status === 400) {
              // Non-retryable error
              throw new Error("Repository is not a mirror");
            }

            // Retryable error (5xx, network issues)
            if (i < maxRetries - 1) {
              const delay = baseDelay * Math.pow(2, i);
              await new Promise(resolve => setTimeout(resolve, delay));
            }
          } catch (error) {
            if (i === maxRetries - 1) {
              throw error;
            }
          }
        }
      };

      // Mock a server error that resolves after 2 retries
      let callCount = 0;
      global.fetch = mock(async () => {
        callCount++;
        if (callCount < 3) {
          return {
            ok: false,
            status: 503,
            statusText: "Service Unavailable"
          } as Response;
        }
        return {
          ok: true,
          status: 200
        } as Response;
      });

      const response = await mockSyncWithRetry(
        "https://gitea.ui.com/api/v1/repos/starred/test-repo/mirror-sync",
        { token: "test-token" }
      );

      expect(response.ok).toBe(true);
      expect(attemptCount).toBe(3);
    });
  });

  describe("Bulk operation error handling", () => {
    test("should continue processing other repos when one fails", async () => {
      const repositories = [
        { name: "repo1", owner: "starred", shouldFail: false },
        { name: "repo2", owner: "starred", shouldFail: true }, // This one will fail
        { name: "repo3", owner: "starred", shouldFail: false }
      ];

      const results: { name: string; success: boolean; error?: string }[] = [];

      // Mock fetch to fail for repo2
      global.fetch = mock(async (url: string) => {
        if (url.includes("repo2")) {
          return {
            ok: false,
            status: 400,
            statusText: "Bad Request",
            headers: new Headers({ "content-type": "application/json" }),
            json: async () => ({
              message: "Repository is not a mirror"
            })
          } as Response;
        }
        return {
          ok: true,
          status: 200
        } as Response;
      });

      // Process repositories
      for (const repo of repositories) {
        try {
          const response = await fetch(
            `https://gitea.ui.com/api/v1/repos/${repo.owner}/${repo.name}/mirror-sync`,
            { method: "POST" }
          );

          if (!response.ok) {
            const error = await response.json();
            throw new Error(error.message);
          }

          results.push({ name: repo.name, success: true });
        } catch (error) {
          results.push({
            name: repo.name,
            success: false,
            error: (error as Error).message
          });
        }
      }

      // Verify results
      expect(results).toHaveLength(3);
      expect(results[0].success).toBe(true);
      expect(results[1].success).toBe(false);
      expect(results[1].error).toBe("Repository is not a mirror");
      expect(results[2].success).toBe(true);
    });
  });
});