import { useState } from "react";
import {
	EmptyState,
	ErrorState,
	LoadingState,
} from "../components/data-states";
import { Icon } from "../components/icon";
import { useMobileViewport } from "../hooks/use-mobile-viewport";
import { ProjectCard } from "../components/features/project/ProjectCard";
import { ProjectDialog } from "../components/features/project/ProjectDialog";
import { RepositoryCreateDialog } from "../components/features/project/repository-create-dialog";
import { MobileListView } from "../components/features/mobile/mobile-list-view";
import { MobileFAB } from "../components/features/mobile/mobile-fab";
import { useProjects } from "../hooks/use-projects";
import type { ProjectWithRepos } from "../types";

type MobileView = "list" | "detail" | "create-project" | "create-repo";

export const ProjectsPage = () => {
	const isMobile = useMobileViewport();
	const [mobileView, setMobileView] = useState<MobileView>("list");
	const [selectedProject, setSelectedProject] =
		useState<ProjectWithRepos | null>(null);

	const {
		projects,
		status,
		reload,
		dialogMode,
		formName,
		setFormName,
		formDescription,
		setFormDescription,
		formError,
		deleteConfirmId,
		setDeleteConfirmId,
		expandedProject,
		setExpandedProject,
		creatingWorkspace,
		setCreatingWorkspace,
		workspaceLoading,
		openCreate,
		openEdit,
		closeDialog,
		handleSubmit,
		handleDelete,
		handleSyncWorkspace,
		handleDeleteWorkspace,
	} = useProjects();

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

	/* ── Mobile views ── */
	if (isMobile) {
		if (mobileView === "create-project") {
			return (
				<div className="mobile-page">
					<ProjectDialog
						mode="create"
						name={formName}
						description={formDescription}
						error={formError}
						onNameChange={setFormName}
						onDescriptionChange={setFormDescription}
						onSubmit={handleSubmit}
						onCancel={() => {
							closeDialog();
							setMobileView("list");
						}}
					/>
				</div>
			);
		}

		if (mobileView === "create-repo" && selectedProject) {
			return (
				<div className="mobile-page">
					<RepositoryCreateDialog
						projectId={selectedProject.id}
						open={true}
						title="Add Repository"
						onClose={() => setMobileView("detail")}
						onCreated={async () => {
							setMobileView("detail");
							await reload();
						}}
					/>
				</div>
			);
		}

		if (mobileView === "detail" && selectedProject) {
			return (
				<div className="mobile-page">
					<ProjectCard
						project={selectedProject}
						expanded={true}
						showBackButton={true}
						deleteConfirm={deleteConfirmId === selectedProject.id}
						workspaceLoading={workspaceLoading}
						showCreateForm={
							creatingWorkspace?.projectId === selectedProject.id
								? creatingWorkspace.repoId
								: null
						}
						onBack={() => {
							setMobileView("list");
							setSelectedProject(null);
						}}
						onEdit={() => {
							setFormName(selectedProject.name);
							setFormDescription(selectedProject.description ?? "");
							setMobileView("create-project");
						}}
						onDelete={() => setDeleteConfirmId(selectedProject.id)}
						onConfirmDelete={() => {
							void handleDelete(selectedProject.id);
							setMobileView("list");
							setSelectedProject(null);
						}}
						onCancelDelete={() => setDeleteConfirmId(null)}
						onCreateWorkspace={(repoId) =>
							setCreatingWorkspace({
								projectId: selectedProject.id,
								repoId,
							})
						}
						onWorkspaceAction={(repoId, workspace, action) => {
							if (action === "sync") {
								void handleSyncWorkspace(
									selectedProject.id,
									repoId,
									workspace,
								);
							} else if (action === "delete") {
								void handleDeleteWorkspace(workspace);
							}
						}}
						onAddRepository={() => setMobileView("create-repo")}
						onCancelCreate={() => setCreatingWorkspace(null)}
						onCreated={() => {
							setCreatingWorkspace(null);
							reload();
						}}
					/>
				</div>
			);
		}

		/* Mobile list view */
		return (
			<div className="mobile-page">
				<div className="mobile-page-header">
					<h1>Projects</h1>
					<span className="muted">
						{projects.length} project{projects.length !== 1 ? "s" : ""}
					</span>
				</div>

				{status === "loading" && <LoadingState message="Loading projects..." />}

				{status === "error" && (
					<ErrorState message="Failed to load projects" onRetry={reload} />
				)}

				{isEmpty && (
					<EmptyState message="No projects yet. Create your first project above." />
				)}

				{status === "ready" && projects.length > 0 && (
					<MobileListView
						items={projects.map((p) => ({
							id: p.id,
							title: p.name,
							subtitle: `${p.repositories?.length ?? 0} repo${(p.repositories?.length ?? 0) !== 1 ? "s" : ""}${p.description ? " · " + p.description : ""}`,
						}))}
						onItemClick={(id) => {
							const project = projects.find((p) => p.id === id);
							if (project) {
								setSelectedProject(project);
								setMobileView("detail");
							}
						}}
						emptyMessage="No projects yet"
					/>
				)}

				<MobileFAB
					onClick={() => {
						openCreate();
						setMobileView("create-project");
					}}
					label="Create project"
				/>
			</div>
		);
	}

	/* ── Desktop view ── */
	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" && <LoadingState message="Loading projects..." />}

			{status === "error" && (
				<ErrorState message="Failed to load projects" onRetry={reload} />
			)}

			{isEmpty && (
				<EmptyState message="No projects yet. Create your first project above." />
			)}

			{status === "ready" && projects.length > 0 && (
				<div className="project-list">
					{projects.map((project) => (
						<ProjectCard
							key={project.id}
							project={project}
							expanded={expandedProject === project.id}
							deleteConfirm={deleteConfirmId === project.id}
							workspaceLoading={workspaceLoading}
							showCreateForm={
								creatingWorkspace?.projectId === project.id
									? creatingWorkspace.repoId
									: null
							}
							onToggle={() =>
								setExpandedProject(
									expandedProject === project.id ? null : project.id,
								)
							}
							onEdit={() => openEdit(project)}
							onDelete={() => setDeleteConfirmId(project.id)}
							onConfirmDelete={() => void handleDelete(project.id)}
							onCancelDelete={() => setDeleteConfirmId(null)}
							onCreateWorkspace={(repoId) =>
								setCreatingWorkspace({ projectId: project.id, repoId })
							}
							onWorkspaceAction={(repoId, workspace, action) => {
								if (action === "sync") {
									void handleSyncWorkspace(project.id, repoId, workspace);
								} else if (action === "delete") {
									void handleDeleteWorkspace(workspace);
								}
							}}
							onCancelCreate={() => setCreatingWorkspace(null)}
							onAddRepository={() => {
								setSelectedProject(project);
								setMobileView("create-repo");
							}}
							onCreated={() => {
								setCreatingWorkspace(null);
								reload();
							}}
						/>
					))}
				</div>
			)}

			{dialogMode !== "none" && (
				<ProjectDialog
					mode={dialogMode}
					name={formName}
					description={formDescription}
					error={formError}
					onNameChange={setFormName}
					onDescriptionChange={setFormDescription}
					onSubmit={handleSubmit}
					onCancel={closeDialog}
				/>
			)}
		</section>
	);
};