import { useCallback, useEffect, useState } from "react";

import { Link } from "react-router-dom";

import {
  createProject,
  deleteProject,
  listProjects,
  type ProjectCreateInput,
} from "../api/projects";
import { Icon } from "../components/icon";
import type { Project } from "../types";

type ProjectsStatus = "loading" | "ready" | "error";

export const ProjectsPage = () => {
  const [status, setStatus] = useState<ProjectsStatus>("loading");
  const [projects, setProjects] = useState<Project[]>([]);
  const [showCreate, setShowCreate] = useState(false);
  const [formName, setFormName] = useState("");
  const [formDescription, setFormDescription] = useState("");
  const [formError, setFormError] = useState<string | null>(null);
  const [deleteConfirmId, setDeleteConfirmId] = useState<string | null>(null);

  const loadProjects = useCallback(async () => {
    setStatus("loading");
    try {
      const data = await listProjects();
      setProjects(data);
      setStatus("ready");
    } catch {
      setProjects([]);
      setStatus("error");
    }
  }, []);

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

  const openCreate = () => {
    setFormName("");
    setFormDescription("");
    setFormError(null);
    setShowCreate(true);
  };

  const closeCreate = () => {
    setShowCreate(false);
    setFormError(null);
  };

  const handleCreate = async (e: React.FormEvent) => {
    e.preventDefault();
    setFormError(null);

    if (!formName.trim()) {
      setFormError("Project name is required");
      return;
    }

    try {
      const input: ProjectCreateInput = {
        name: formName.trim(),
        description: formDescription.trim() || null,
      };
      await createProject(input);
      closeCreate();
      await loadProjects();
    } catch {
      setFormError("Failed to save project");
    }
  };

  const handleDelete = async (projectId: string) => {
    try {
      await deleteProject(projectId);
      setDeleteConfirmId(null);
      await loadProjects();
    } catch {
      setDeleteConfirmId(null);
    }
  };

  const isEmpty = status === "ready" && projects.length === 0;

  return (
    <section className="stack">
      <div className="page-header">
        <h1>Projects</h1>
        <button className="primary-button" onClick={openCreate} type="button">
          <Icon name="add" size="sm" />
          New Project
        </button>
      </div>

      {status === "loading" && <p className="muted">Loading projects...</p>}

      {status === "error" && (
        <div className="card stack">
          <p>Failed to load projects</p>
          <button className="secondary-button" onClick={() => void loadProjects()} type="button">
            <Icon name="refresh" size="sm" />
            Retry
          </button>
        </div>
      )}

      {isEmpty && <p className="muted">No projects yet. Create your first project above.</p>}

      {status === "ready" && projects.length > 0 && (
        <div className="project-list">
          {projects.map((project) => (
            <article className="card project-card" key={project.id}>
              <div className="project-info">
                <h3>{project.name}</h3>
                {project.description && <p className="muted">{project.description}</p>}
              </div>
              <div className="project-actions">
                <Link
                  className="ghost-button"
                  to={`/projects/${project.id}/settings`}
                >
                  <Icon name="settings" size="sm" />
                  Settings
                </Link>
                {deleteConfirmId === project.id ? (
                  <div className="delete-confirm">
                    <span>Are you sure?</span>
                    <button
                      className="danger-button"
                      onClick={() => void handleDelete(project.id)}
                      type="button"
                    >
                      <Icon name="delete" size="sm" />
                      Delete
                    </button>
                    <button
                      className="ghost-button"
                      onClick={() => setDeleteConfirmId(null)}
                      type="button"
                    >
                      <Icon name="cancel" size="sm" />
                      Cancel
                    </button>
                  </div>
                ) : (
                  <button
                    className="ghost-button danger-text"
                    onClick={() => setDeleteConfirmId(project.id)}
                    type="button"
                  >
                    <Icon name="delete" size="sm" />
                    Delete
                  </button>
                )}
                <Link className="ghost-button" to={`/projects/${project.id}`}>
                  Open Workspace
                </Link>
              </div>
            </article>
          ))}
        </div>
      )}

      {showCreate && (
        <div className="dialog-overlay" role="dialog" aria-modal="true">
          <div className="dialog">
            <h2>Create Project</h2>
            <form onSubmit={handleCreate} className="stack">
              <label className="form-field">
                Name
                <input
                  type="text"
                  value={formName}
                  onChange={(e) => setFormName(e.target.value)}
                  placeholder="Project name"
                />
              </label>
              <label className="form-field">
                Description
                <textarea
                  value={formDescription}
                  onChange={(e) => setFormDescription(e.target.value)}
                  placeholder="Optional description"
                  rows={3}
                />
              </label>
              {formError && <p className="error-text">{formError}</p>}
              <div className="dialog-actions">
                <button className="secondary-button" onClick={closeCreate} type="button">
                  <Icon name="cancel" size="sm" />
                  Cancel
                </button>
                <button className="primary-button" type="submit">
                  <Icon name="add" size="sm" />
                  Create
                </button>
              </div>
            </form>
          </div>
        </div>
      )}
    </section>
  );
};