/** Header sub-component for WorkItemDetailPanel. */

import type { AgentConfigInfo, AgentInfo, AgentStatusValue } from "../api/agents";
import { STAGE_LABELS, formatStoryTitle } from "./workItemDetailPanelUtils";

const STAGE_TO_AGENT_STAGE: Record<string, string> = {
	current: "coder",
	qa: "qa",
	merge: "mergemaster",
};

interface WorkItemDetailPanelHeaderProps {
	storyId: string;
	name: string | null;
	stage: string;
	assignedAgent: string | null;
	agentConfig: AgentConfigInfo[];
	agentInfo: AgentInfo | null;
	agentStatus: AgentStatusValue | null;
	assigning: boolean;
	assignError: string | null;
	onAgentAssign: (agentName: string) => Promise<void>;
	onClose: () => void;
}

/**
 * Panel header: title, stage label, agent assignment dropdown, and close button.
 */
export function WorkItemDetailPanelHeader({
	storyId,
	name,
	stage,
	assignedAgent,
	agentConfig,
	agentInfo,
	agentStatus,
	assigning,
	assignError,
	onAgentAssign,
	onClose,
}: WorkItemDetailPanelHeaderProps) {
	const stageLabel = STAGE_LABELS[stage] ?? stage;
	const filteredAgents = agentConfig.filter(
		(a) => a.stage === STAGE_TO_AGENT_STAGE[stage],
	);
	const activeAgentName =
		agentInfo && (agentStatus === "running" || agentStatus === "pending")
			? agentInfo.agent_name
			: null;

	return (
		<div
			style={{
				display: "flex",
				alignItems: "center",
				justifyContent: "space-between",
				padding: "12px 16px",
				borderBottom: "1px solid #333",
				flexShrink: 0,
			}}
		>
			<div
				style={{
					display: "flex",
					flexDirection: "column",
					gap: "2px",
					minWidth: 0,
				}}
			>
				<div
					data-testid="detail-panel-title"
					style={{
						fontWeight: 600,
						fontSize: "0.95em",
						color: "#ececec",
						overflow: "hidden",
						textOverflow: "ellipsis",
						whiteSpace: "nowrap",
					}}
				>
					{formatStoryTitle(storyId, name)}
				</div>
				{stage && (
					<div
						data-testid="detail-panel-stage"
						style={{ fontSize: "0.75em", color: "#888" }}
					>
						{stageLabel}
					</div>
				)}
				{filteredAgents.length > 0 && (
					<div
						data-testid="detail-panel-agent-assignment"
						style={{
							display: "flex",
							alignItems: "center",
							gap: "6px",
							marginTop: "4px",
						}}
					>
						<span style={{ fontSize: "0.75em", color: "#666" }}>Agent:</span>
						<select
							data-testid="agent-assignment-dropdown"
							disabled={assigning}
							value={activeAgentName ?? assignedAgent ?? ""}
							onChange={(e) => onAgentAssign(e.target.value)}
							style={{
								background: "#1a1a1a",
								border: "1px solid #444",
								borderRadius: "4px",
								color: "#ccc",
								cursor: assigning ? "not-allowed" : "pointer",
								fontSize: "0.75em",
								padding: "2px 6px",
								opacity: assigning ? 0.6 : 1,
							}}
						>
							<option value="">— none —</option>
							{filteredAgents.map((a) => {
								const isRunning =
									agentInfo?.agent_name === a.name &&
									agentStatus === "running";
								const isPending =
									agentInfo?.agent_name === a.name &&
									agentStatus === "pending";
								const statusLabel = isRunning
									? " — running"
									: isPending
										? " — pending"
										: " — idle";
								const modelPart = a.model ? ` (${a.model})` : "";
								return (
									<option key={a.name} value={a.name}>
										{a.name}
										{modelPart}
										{statusLabel}
									</option>
								);
							})}
						</select>
						{assigning && (
							<span style={{ fontSize: "0.7em", color: "#888" }}>
								Assigning…
							</span>
						)}
						{assignError && (
							<span
								data-testid="agent-assignment-error"
								style={{ fontSize: "0.7em", color: "#f85149" }}
							>
								{assignError}
							</span>
						)}
					</div>
				)}
				{filteredAgents.length === 0 && assignedAgent ? (
					<div
						data-testid="detail-panel-assigned-agent"
						style={{ fontSize: "0.75em", color: "#888" }}
					>
						Agent: {assignedAgent}
					</div>
				) : null}
			</div>
			<button
				type="button"
				data-testid="detail-panel-close"
				onClick={onClose}
				style={{
					background: "none",
					border: "1px solid #444",
					borderRadius: "6px",
					color: "#aaa",
					cursor: "pointer",
					padding: "4px 10px",
					fontSize: "0.8em",
					flexShrink: 0,
				}}
			>
				Close
			</button>
		</div>
	);
}