import { fireEvent, render, screen } from "@testing-library/react";
import { describe, expect, it, vi } from "vitest";
import { ChatHeader } from "./ChatHeader";

interface ChatHeaderProps {
	projectPath: string;
	onCloseProject: () => void;
	contextUsage: { used: number; total: number; percentage: number };
	onClearSession: () => void;
	model: string;
	availableModels: string[];
	claudeModels: string[];
	hasAnthropicKey: boolean;
	onModelChange: (model: string) => void;
	enableTools: boolean;
	onToggleTools: (enabled: boolean) => void;
}

function makeProps(overrides: Partial<ChatHeaderProps> = {}): ChatHeaderProps {
	return {
		projectPath: "/test/project",
		onCloseProject: vi.fn(),
		contextUsage: { used: 1000, total: 10000, percentage: 10 },
		onClearSession: vi.fn(),
		model: "claude-sonnet",
		availableModels: ["llama3"],
		claudeModels: ["claude-sonnet"],
		hasAnthropicKey: true,
		onModelChange: vi.fn(),
		enableTools: true,
		onToggleTools: vi.fn(),
		...overrides,
	};
}

describe("ChatHeader", () => {
	it("renders project path", () => {
		render(<ChatHeader {...makeProps()} />);
		expect(screen.getByText("/test/project")).toBeInTheDocument();
	});

	it("calls onCloseProject when close button is clicked", () => {
		const onCloseProject = vi.fn();
		render(<ChatHeader {...makeProps({ onCloseProject })} />);
		fireEvent.click(screen.getByText("\u2715"));
		expect(onCloseProject).toHaveBeenCalled();
	});

	it("displays context percentage with green emoji when low", () => {
		render(
			<ChatHeader
				{...makeProps({
					contextUsage: { used: 1000, total: 10000, percentage: 10 },
				})}
			/>,
		);
		expect(screen.getByText(/10%/)).toBeInTheDocument();
	});

	it("displays yellow emoji when context is 75-89%", () => {
		render(
			<ChatHeader
				{...makeProps({
					contextUsage: { used: 8000, total: 10000, percentage: 80 },
				})}
			/>,
		);
		expect(screen.getByText(/80%/)).toBeInTheDocument();
	});

	it("displays red emoji when context is 90%+", () => {
		render(
			<ChatHeader
				{...makeProps({
					contextUsage: { used: 9500, total: 10000, percentage: 95 },
				})}
			/>,
		);
		expect(screen.getByText(/95%/)).toBeInTheDocument();
	});

	it("calls onClearSession when New Session button is clicked", () => {
		const onClearSession = vi.fn();
		render(<ChatHeader {...makeProps({ onClearSession })} />);
		fireEvent.click(screen.getByText(/New Session/));
		expect(onClearSession).toHaveBeenCalled();
	});

	it("renders select dropdown when model options are available", () => {
		render(<ChatHeader {...makeProps()} />);
		const select = screen.getByRole("combobox");
		expect(select).toBeInTheDocument();
	});

	it("renders text input when no model options are available", () => {
		render(
			<ChatHeader {...makeProps({ availableModels: [], claudeModels: [] })} />,
		);
		expect(screen.getByPlaceholderText("Model")).toBeInTheDocument();
	});

	it("calls onModelChange when model is selected from dropdown", () => {
		const onModelChange = vi.fn();
		render(<ChatHeader {...makeProps({ onModelChange })} />);
		const select = screen.getByRole("combobox");
		fireEvent.change(select, { target: { value: "llama3" } });
		expect(onModelChange).toHaveBeenCalledWith("llama3");
	});

	it("calls onModelChange when text is typed in model input", () => {
		const onModelChange = vi.fn();
		render(
			<ChatHeader
				{...makeProps({
					availableModels: [],
					claudeModels: [],
					onModelChange,
				})}
			/>,
		);
		const input = screen.getByPlaceholderText("Model");
		fireEvent.change(input, { target: { value: "custom-model" } });
		expect(onModelChange).toHaveBeenCalledWith("custom-model");
	});

	it("calls onToggleTools when checkbox is toggled", () => {
		const onToggleTools = vi.fn();
		render(<ChatHeader {...makeProps({ onToggleTools })} />);
		const checkbox = screen.getByRole("checkbox");
		fireEvent.click(checkbox);
		expect(onToggleTools).toHaveBeenCalled();
	});

	it("displays the build timestamp in human-readable format", () => {
		render(<ChatHeader {...makeProps()} />);
		expect(screen.getByText("Built: 2026-01-01 00:00")).toBeInTheDocument();
	});

	it("displays Story Kit branding in the header", () => {
		render(<ChatHeader {...makeProps()} />);
		expect(screen.getByText("Story Kit")).toBeInTheDocument();
	});

	it("shows disabled placeholder when claudeModels is empty and no API key", () => {
		render(
			<ChatHeader
				{...makeProps({
					claudeModels: [],
					hasAnthropicKey: false,
					availableModels: ["llama3"],
				})}
			/>,
		);
		expect(
			screen.getByText("Add Anthropic API key to load models"),
		).toBeInTheDocument();
	});

	// ── Close button hover/focus handlers ─────────────────────────────────────

	it("close button changes background on mouseOver and resets on mouseOut", () => {
		render(<ChatHeader {...makeProps()} />);
		const closeBtn = screen.getByText("\u2715");
		fireEvent.mouseOver(closeBtn);
		expect(closeBtn.style.background).toBe("rgb(51, 51, 51)");
		fireEvent.mouseOut(closeBtn);
		expect(closeBtn.style.background).toBe("transparent");
	});

	it("close button changes background on focus and resets on blur", () => {
		render(<ChatHeader {...makeProps()} />);
		const closeBtn = screen.getByText("\u2715");
		fireEvent.focus(closeBtn);
		expect(closeBtn.style.background).toBe("rgb(51, 51, 51)");
		fireEvent.blur(closeBtn);
		expect(closeBtn.style.background).toBe("transparent");
	});

	// ── New Session button hover/focus handlers ───────────────────────────────

	it("New Session button changes style on mouseOver and resets on mouseOut", () => {
		render(<ChatHeader {...makeProps()} />);
		const sessionBtn = screen.getByText(/New Session/);
		fireEvent.mouseOver(sessionBtn);
		expect(sessionBtn.style.backgroundColor).toBe("rgb(63, 63, 63)");
		expect(sessionBtn.style.color).toBe("rgb(204, 204, 204)");
		fireEvent.mouseOut(sessionBtn);
		expect(sessionBtn.style.backgroundColor).toBe("rgb(47, 47, 47)");
		expect(sessionBtn.style.color).toBe("rgb(136, 136, 136)");
	});

	it("New Session button changes style on focus and resets on blur", () => {
		render(<ChatHeader {...makeProps()} />);
		const sessionBtn = screen.getByText(/New Session/);
		fireEvent.focus(sessionBtn);
		expect(sessionBtn.style.backgroundColor).toBe("rgb(63, 63, 63)");
		expect(sessionBtn.style.color).toBe("rgb(204, 204, 204)");
		fireEvent.blur(sessionBtn);
		expect(sessionBtn.style.backgroundColor).toBe("rgb(47, 47, 47)");
		expect(sessionBtn.style.color).toBe("rgb(136, 136, 136)");
	});
});