"use client";

import {
	AlertTriangle,
	CheckCircle2,
	ChevronRight,
	Circle,
	Play,
} from "lucide-react";
import {
	getLiveWorkspaceIndex,
	type RiskLevel,
	useSFWorkspaceState,
} from "@/lib/sf-workspace-store";
import { cn } from "@/lib/utils";
import {
	getMilestoneStatus,
	getSliceStatus,
	type ItemStatus,
} from "@/lib/workspace-status";

const StatusIcon = ({
	status,
	size = "default",
}: {
	status: ItemStatus;
	size?: "default" | "large";
}) => {
	const sizeClass = size === "large" ? "h-5 w-5" : "h-4 w-4";
	if (status === "done") {
		return <CheckCircle2 className={cn(sizeClass, "text-success")} />;
	}
	if (status === "in-progress") {
		return <Play className={cn(sizeClass, "text-warning")} />;
	}
	return <Circle className={cn(sizeClass, "text-muted-foreground")} />;
};

const RiskBadge = ({ risk }: { risk: RiskLevel }) => {
	return (
		<span
			className={cn(
				"inline-flex items-center gap-1 rounded px-1.5 py-0.5 text-[10px] font-medium uppercase",
				risk === "high" && "bg-destructive/20 text-destructive",
				risk === "medium" && "bg-warning/20 text-warning",
				risk === "low" && "bg-muted text-muted-foreground",
			)}
		>
			{risk === "high" && <AlertTriangle className="h-2.5 w-2.5" />}
			{risk}
		</span>
	);
};

export function Roadmap() {
	const workspace = useSFWorkspaceState();
	const liveWorkspace = getLiveWorkspaceIndex(workspace);
	const milestones = liveWorkspace?.milestones ?? [];
	const activeScope = liveWorkspace?.active ?? {};
	const workspaceFreshness = workspace.live.freshness.workspace.stale
		? "stale"
		: workspace.live.freshness.workspace.status;

	return (
		<div className="flex h-full flex-col overflow-hidden">
			<div className="border-b border-border px-6 py-3">
				<h1 className="text-lg font-semibold">Roadmap</h1>
				<p className="text-sm text-muted-foreground">
					Project milestone structure with slices and dependencies
				</p>
				<p
					className="mt-1 text-xs text-muted-foreground"
					data-testid="roadmap-workspace-freshness"
				>
					Workspace freshness: {workspaceFreshness}
				</p>
			</div>

			<div className="flex-1 overflow-y-auto p-6">
				{workspace.bootStatus === "loading" && (
					<div className="py-8 text-center text-sm text-muted-foreground">
						Loading workspace…
					</div>
				)}

				{workspace.bootStatus === "ready" && milestones.length === 0 && (
					<div className="py-8 text-center text-sm text-muted-foreground">
						No milestones found. Create a milestone with{" "}
						<code className="rounded bg-muted px-1.5 py-0.5 font-mono text-xs">
							/sf
						</code>{" "}
						to get started.
					</div>
				)}

				<div className="space-y-6">
					{milestones.map((milestone) => {
						const milestoneStatus = getMilestoneStatus(milestone, activeScope);
						const doneSlices = milestone.slices.filter((s) => s.done).length;
						const totalTasks = milestone.slices.reduce(
							(acc, s) => acc + s.tasks.length,
							0,
						);
						const doneTasks = milestone.slices.reduce(
							(acc, s) => acc + s.tasks.filter((t) => t.done).length,
							0,
						);

						return (
							<div
								key={milestone.id}
								className="rounded-md border border-border bg-card"
							>
								<div
									className={cn(
										"flex items-center gap-3 border-b border-border px-4 py-3",
										milestoneStatus === "in-progress" && "bg-accent/30",
									)}
								>
									<StatusIcon status={milestoneStatus} size="large" />
									<div className="flex-1">
										<div className="flex items-center gap-2">
											<span className="font-mono text-xs text-muted-foreground">
												{milestone.id}
											</span>
											<ChevronRight className="h-3 w-3 text-muted-foreground" />
											<span className="font-semibold">{milestone.title}</span>
										</div>
									</div>
									<div className="text-right">
										<div className="text-sm font-medium">
											{doneSlices}/{milestone.slices.length} slices
										</div>
										<div className="text-xs text-muted-foreground">
											{doneTasks}/{totalTasks} tasks
										</div>
									</div>
								</div>

								<div className="divide-y divide-border">
									{milestone.slices.map((slice) => {
										const sliceStatus = getSliceStatus(
											milestone.id,
											slice,
											activeScope,
										);
										const sliceDoneTasks = slice.tasks.filter(
											(t) => t.done,
										).length;
										const sliceTotalTasks = slice.tasks.length;

										return (
											<div
												key={`${milestone.id}-${slice.id}`}
												className={cn(
													"flex items-center gap-3 px-4 py-2.5",
													sliceStatus === "in-progress" && "bg-accent/20",
													sliceStatus === "pending" && "opacity-70",
												)}
											>
												<div className="w-4" />
												<StatusIcon status={sliceStatus} />
												<div className="flex-1">
													<div className="flex items-center gap-2">
														<span className="font-mono text-xs text-muted-foreground">
															{slice.id}
														</span>
														<span className="text-sm">{slice.title}</span>
														{slice.risk && <RiskBadge risk={slice.risk} />}
														{slice.depends && slice.depends.length > 0 && (
															<span className="text-[10px] text-muted-foreground">
																depends on {slice.depends.join(", ")}
															</span>
														)}
													</div>
												</div>
												<div className="flex items-center gap-4">
													<div className="w-24">
														<div className="h-1 w-full rounded-full bg-accent">
															<div
																className="h-full rounded-full bg-foreground/70 transition-all"
																style={{
																	width:
																		sliceTotalTasks > 0
																			? `${(sliceDoneTasks / sliceTotalTasks) * 100}%`
																			: "0%",
																}}
															/>
														</div>
													</div>
													<span className="w-12 text-right text-xs text-muted-foreground">
														{sliceDoneTasks}/{sliceTotalTasks}
													</span>
												</div>
											</div>
										);
									})}
								</div>
							</div>
						);
					})}
				</div>
			</div>
		</div>
	);
}