import { useCallback, useEffect, useState } from "react";
import { useParams, useSearchParams } from "react-router-dom";
import { apiClient } from "../api/client";
import {
  getRepositoryStatus,
  listRepositories,
  type GitRepository,
  type GitStatus,
} from "../api/git-repositories";
import { listToolTypes, type ToolType } from "../api/tool-types";

type WorkspaceStatus = "loading" | "ready" | "error" | "empty";

export interface Project {
  id: string;
  name: string;
  description?: string | null;
}

export const useRepoWorkspace = () => {
  const { projectId } = useParams<{ projectId: string }>();
  const [searchParams, setSearchParams] = useSearchParams();

  const [status, setStatus] = useState<WorkspaceStatus>("loading");
  const [project, setProject] = useState<Project | null>(null);
  const [repositories, setRepositories] = useState<GitRepository[]>([]);
  const [selectedRepoId, setSelectedRepoId] = useState<string | null>(
    searchParams.get("repo")
  );
  const [branches, setBranches] = useState<string[]>([]);
  const [currentBranch, setCurrentBranch] = useState<string>("main");
  const [gitStatus, setGitStatus] = useState<GitStatus | null>(null);
  const [toolTypes, setToolTypes] = useState<ToolType[]>([]);

  const loadProject = useCallback(async () => {
    if (!projectId) return;
    try {
      const response = await apiClient.get(`/projects/${projectId}`);
      setProject(response.data);
    } catch {
      setProject(null);
    }
  }, [projectId]);

  const loadRepositories = useCallback(async () => {
    if (!projectId) return;
    setStatus("loading");
    try {
      const data = await listRepositories(projectId);
      setRepositories(data);
      if (data.length === 0) {
        setStatus("empty");
      } else {
        setStatus("ready");
        if (!selectedRepoId) {
          setSelectedRepoId(data[0].id);
          const newParams = new URLSearchParams(searchParams);
          newParams.set("repo", data[0].id);
          setSearchParams(newParams, { replace: true });
        }
      }
    } catch {
      setRepositories([]);
      setStatus("error");
    }
  }, [projectId, selectedRepoId, searchParams, setSearchParams]);

  const loadBranches = useCallback(async () => {
    if (!projectId || !selectedRepoId) return;
    try {
      const response = await apiClient.get(
        `/projects/${projectId}/repositories/${selectedRepoId}/branches`
      );
      const branchList = response.data.branches.map((b: { name: string }) => b.name);
      setBranches(branchList);
      const defaultBranch = response.data.default_branch;
      if (defaultBranch) setCurrentBranch(defaultBranch);
    } catch {
      setBranches([]);
    }
  }, [projectId, selectedRepoId]);

  const loadGitStatus = useCallback(async () => {
    if (!projectId || !selectedRepoId) return;
    try {
      const data = await getRepositoryStatus(projectId, selectedRepoId);
      setGitStatus(data);
    } catch {
      setGitStatus(null);
    }
  }, [projectId, selectedRepoId]);

  const loadToolTypes = useCallback(async () => {
    try {
      const data = await listToolTypes();
      setToolTypes(data);
    } catch {
      setToolTypes([]);
    }
  }, []);

  useEffect(() => {
    void loadProject();
    void loadRepositories();
    void loadToolTypes();
  }, [loadProject, loadRepositories, loadToolTypes]);

  useEffect(() => {
    void loadBranches();
    void loadGitStatus();
  }, [loadBranches, loadGitStatus]);

  const handleRepoChange = (repoId: string) => {
    setSelectedRepoId(repoId);
    const newParams = new URLSearchParams(searchParams);
    newParams.set("repo", repoId);
    newParams.delete("branch");
    newParams.delete("path");
    setSearchParams(newParams);
  };

  const handleBranchChange = (branch: string) => {
    setCurrentBranch(branch);
    const newParams = new URLSearchParams(searchParams);
    newParams.set("branch", branch);
    setSearchParams(newParams);
  };

  const selectedRepo = repositories.find((r) => r.id === selectedRepoId);

  return {
    projectId,
    project,
    status,
    repositories,
    selectedRepoId,
    selectedRepo,
    branches,
    currentBranch,
    gitStatus,
    toolTypes,
    handleRepoChange,
    handleBranchChange,
    loadGitStatus,
    loadBranches,
    loadRepositories,
  };
};