/**
 * ChatPanel Component Tests
 */

import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";

describe("ChatPanel useElapsedTimer Logic", () => {
  beforeEach(() => {
    vi.useFakeTimers();
  });

  afterEach(() => {
    vi.useRealTimers();
  });

  describe("Timer Initialization", () => {
    it("initializes with 0ms values", () => {
      const timer = { liveMs: 0, finalMs: 0, displayMs: 0 };
      expect(timer.liveMs).toBe(0);
      expect(timer.finalMs).toBe(0);
      expect(timer.displayMs).toBe(0);
    });
  });

  describe("Timer Behavior", () => {
    it("calculates elapsed time correctly", () => {
      const startTime = Date.now();
      vi.advanceTimersByTime(1500);
      const elapsed = Date.now() - startTime;
      expect(elapsed).toBe(1500);
    });

    it("updates every 100ms", () => {
      let updateCount = 0;
      const interval = setInterval(() => {
        updateCount++;
      }, 100);

      vi.advanceTimersByTime(500);
      clearInterval(interval);

      expect(updateCount).toBe(5);
    });
  });

  describe("Active State Transitions", () => {
    it("starts counting when isActive becomes true", () => {
      let isActive = false;
      let startTime: number | null = null;

      // Transition to active
      isActive = true;
      startTime = Date.now();

      expect(isActive).toBe(true);
      expect(startTime).not.toBeNull();
    });

    it("captures final value when isActive becomes false", () => {
      let isActive = true;
      let finalMs = 0;
      const startTime = Date.now();

      vi.advanceTimersByTime(2000);

      // Transition to inactive
      isActive = false;
      finalMs = Date.now() - startTime;

      expect(isActive).toBe(false);
      expect(finalMs).toBe(2000);
    });
  });

  describe("Display Logic", () => {
    it("shows liveMs during active state", () => {
      const isActive = true;
      const liveMs = 1500;
      const finalMs = 0;
      const displayMs = isActive ? liveMs : finalMs;
      expect(displayMs).toBe(1500);
    });

    it("shows finalMs after deactivation", () => {
      const isActive = false;
      const liveMs = 0;
      const finalMs = 2000;
      const displayMs = isActive ? liveMs : finalMs;
      expect(displayMs).toBe(2000);
    });
  });
});

describe("ChatPanel formatTime Logic", () => {
  const formatTime = (seconds: number): string => {
    if (seconds < 60) {
      return `${seconds}s`;
    }
    const mins = Math.floor(seconds / 60);
    const secs = seconds % 60;
    return `${mins}:${secs.toString().padStart(2, "0")}`;
  };

  it("formats seconds under 60", () => {
    expect(formatTime(0)).toBe("0s");
    expect(formatTime(30)).toBe("30s");
    expect(formatTime(59)).toBe("59s");
  });

  it("formats exactly 60 seconds as 1:00", () => {
    expect(formatTime(60)).toBe("1:00");
  });

  it("formats minutes and seconds", () => {
    expect(formatTime(90)).toBe("1:30");
    expect(formatTime(125)).toBe("2:05");
    expect(formatTime(601)).toBe("10:01");
  });

  it("pads single digit seconds with zero", () => {
    expect(formatTime(65)).toBe("1:05");
    expect(formatTime(301)).toBe("5:01");
  });
});

describe("ChatPanel Message Component Logic", () => {
  describe("Edit Mode State", () => {
    it("initializes with editing false", () => {
      const isEditing = false;
      expect(isEditing).toBe(false);
    });

    it("enters edit mode", () => {
      let isEditing = false;
      isEditing = true;
      expect(isEditing).toBe(true);
    });

    it("exits edit mode on save", () => {
      let isEditing = true;
      isEditing = false;
      expect(isEditing).toBe(false);
    });

    it("exits edit mode on cancel", () => {
      let isEditing = true;
      isEditing = false;
      expect(isEditing).toBe(false);
    });
  });

  describe("Edit Content Management", () => {
    it("syncs editContent with message content on edit start", () => {
      const messageContent = "Original message";
      let editContent = "";

      // Start editing
      editContent = messageContent;

      expect(editContent).toBe("Original message");
    });

    it("allows editContent modification", () => {
      let editContent = "Original";
      editContent = "Modified content";
      expect(editContent).toBe("Modified content");
    });

    it("restores original on cancel", () => {
      const originalContent = "Original";
      let editContent = "Modified";

      // Cancel
      editContent = originalContent;

      expect(editContent).toBe("Original");
    });
  });

  describe("Thinking Section Toggle", () => {
    it("initializes with thinking collapsed", () => {
      const showThinking = false;
      expect(showThinking).toBe(false);
    });

    it("toggles thinking section open", () => {
      let showThinking = false;
      showThinking = !showThinking;
      expect(showThinking).toBe(true);
    });

    it("toggles thinking section closed", () => {
      let showThinking = true;
      showThinking = !showThinking;
      expect(showThinking).toBe(false);
    });
  });

  describe("Message Role Detection", () => {
    it("identifies user message", () => {
      const message = { role: "user", content: "Hello" };
      const isUser = message.role === "user";
      expect(isUser).toBe(true);
    });

    it("identifies assistant message", () => {
      const message = { role: "assistant", content: "Hello" };
      const isUser = message.role === "user";
      expect(isUser).toBe(false);
    });
  });

  describe("Status Display Logic", () => {
    it("shows status when showStatus is true and streaming", () => {
      const showStatus = true;
      const isStreaming = true;
      const shouldShow = showStatus && isStreaming;
      expect(shouldShow).toBe(true);
    });

    it("hides status when showStatus is false", () => {
      const showStatus = false;
      const isStreaming = true;
      const shouldShow = showStatus && isStreaming;
      expect(shouldShow).toBe(false);
    });
  });

  describe("Action Button Visibility", () => {
    it("shows action buttons when not editing and not disabled", () => {
      const isEditing = false;
      const disabled = false;
      const showActions = !isEditing && !disabled;
      expect(showActions).toBe(true);
    });

    it("hides action buttons when editing", () => {
      const isEditing = true;
      const disabled = false;
      const showActions = !isEditing && !disabled;
      expect(showActions).toBe(false);
    });

    it("hides action buttons when disabled", () => {
      const isEditing = false;
      const disabled = true;
      const showActions = !isEditing && !disabled;
      expect(showActions).toBe(false);
    });
  });

  describe("Error Display", () => {
    it("shows error when message has error", () => {
      const message = { error: "Network error" };
      const hasError = !!message.error;
      expect(hasError).toBe(true);
    });

    it("hides error when message has no error", () => {
      const message = { error: undefined };
      const hasError = !!message.error;
      expect(hasError).toBe(false);
    });
  });
});

describe("ChatPanel Input Logic", () => {
  describe("Input Value Management", () => {
    it("initializes with empty input", () => {
      const input = "";
      expect(input).toBe("");
    });

    it("updates input value", () => {
      let input = "";
      input = "Hello, world!";
      expect(input).toBe("Hello, world!");
    });

    it("clears input after send", () => {
      let input = "Message to send";
      input = "";
      expect(input).toBe("");
    });
  });

  describe("Send Validation", () => {
    it("allows send when input has content", () => {
      const input = "Hello";
      const isStreaming = false;
      const canSend = input.trim().length > 0 && !isStreaming;
      expect(canSend).toBe(true);
    });

    it("prevents send when input is empty", () => {
      const input = "   ";
      const isStreaming = false;
      const canSend = input.trim().length > 0 && !isStreaming;
      expect(canSend).toBe(false);
    });

    it("prevents send when streaming", () => {
      const input = "Hello";
      const isStreaming = true;
      const canSend = input.trim().length > 0 && !isStreaming;
      expect(canSend).toBe(false);
    });
  });

  describe("Keyboard Shortcuts", () => {
    it("detects Enter key for send", () => {
      const key = "Enter";
      const shiftKey = false;
      const shouldSend = key === "Enter" && !shiftKey;
      expect(shouldSend).toBe(true);
    });

    it("detects Shift+Enter for newline", () => {
      const key = "Enter";
      const shiftKey = true;
      const shouldSend = key === "Enter" && !shiftKey;
      expect(shouldSend).toBe(false);
    });
  });
});