import { describe, it, expect } from "vitest";

// Test the Conversation interface and store behavior
describe("Conversation interface", () => {
  it("defines all required fields", () => {
    const conversation = {
      id: "conv-123",
      name: "Test Conversation",
      terminalLines: [],
      sessionId: null,
      connectionStatus: "disconnected" as const,
      workingDirectory: "",
      characterState: "idle" as const,
      isProcessing: false,
      grantedTools: new Set<string>(),
      pendingPermission: null,
      pendingQuestion: null,
      scrollPosition: -1,
      createdAt: new Date(),
      lastActivityAt: new Date(),
      attachments: [],
    };

    expect(conversation.id).toBe("conv-123");
    expect(conversation.name).toBe("Test Conversation");
    expect(conversation.terminalLines).toEqual([]);
    expect(conversation.sessionId).toBeNull();
    expect(conversation.connectionStatus).toBe("disconnected");
    expect(conversation.workingDirectory).toBe("");
    expect(conversation.characterState).toBe("idle");
    expect(conversation.isProcessing).toBe(false);
    expect(conversation.grantedTools.size).toBe(0);
    expect(conversation.pendingPermission).toBeNull();
    expect(conversation.pendingQuestion).toBeNull();
    expect(conversation.scrollPosition).toBe(-1);
    expect(conversation.attachments).toEqual([]);
  });

  it("handles terminal lines array", () => {
    const lines = [
      {
        id: "line-1",
        type: "user" as const,
        content: "Hello",
        timestamp: new Date(),
      },
      {
        id: "line-2",
        type: "assistant" as const,
        content: "Hi there!",
        timestamp: new Date(),
      },
    ];

    expect(lines).toHaveLength(2);
    expect(lines[0].type).toBe("user");
    expect(lines[1].type).toBe("assistant");
  });
});

describe("conversation ID generation", () => {
  it("generates unique IDs with timestamp prefix", () => {
    let counter = 0;
    const generateId = () => `conv-${Date.now()}-${counter++}`;

    const id1 = generateId();
    const id2 = generateId();

    expect(id1).toMatch(/^conv-\d+-\d+$/);
    expect(id2).toMatch(/^conv-\d+-\d+$/);
    expect(id1).not.toBe(id2);
  });
});

describe("line ID generation", () => {
  it("generates unique line IDs", () => {
    let counter = 0;
    const generateLineId = () => `line-${Date.now()}-${counter++}`;

    const id1 = generateLineId();
    const id2 = generateLineId();

    expect(id1).toMatch(/^line-\d+-\d+$/);
    expect(id2).toMatch(/^line-\d+-\d+$/);
    expect(id1).not.toBe(id2);
  });
});

describe("connection status types", () => {
  it("supports all connection status values", () => {
    const statuses = ["connected", "disconnected", "connecting", "error"] as const;

    statuses.forEach((status) => {
      expect(typeof status).toBe("string");
    });
  });
});

describe("character state types", () => {
  it("supports all character state values", () => {
    const states = [
      "idle",
      "thinking",
      "typing",
      "searching",
      "coding",
      "mcp",
      "permission",
      "success",
      "error",
    ] as const;

    states.forEach((state) => {
      expect(typeof state).toBe("string");
    });
  });
});

describe("terminal line types", () => {
  it("supports all terminal line types", () => {
    const types = ["user", "assistant", "system", "tool", "error"] as const;

    types.forEach((type) => {
      expect(typeof type).toBe("string");
    });
  });

  it("creates terminal line with required fields", () => {
    const line = {
      id: "line-123",
      type: "user" as const,
      content: "Test message",
      timestamp: new Date(),
      toolName: undefined,
    };

    expect(line.id).toBe("line-123");
    expect(line.type).toBe("user");
    expect(line.content).toBe("Test message");
    expect(line.timestamp).toBeInstanceOf(Date);
    expect(line.toolName).toBeUndefined();
  });

  it("creates terminal line with tool name", () => {
    const line = {
      id: "line-456",
      type: "tool" as const,
      content: "Tool output",
      timestamp: new Date(),
      toolName: "Read",
    };

    expect(line.toolName).toBe("Read");
  });
});

describe("permission request structure", () => {
  it("creates valid permission request", () => {
    const request = {
      id: "perm-123",
      tool: "Bash",
      description: "Run shell command",
      input: '{"command": "ls"}',
    };

    expect(request.id).toBe("perm-123");
    expect(request.tool).toBe("Bash");
    expect(request.description).toBe("Run shell command");
    expect(request.input).toContain("command");
  });
});

describe("user question structure", () => {
  it("creates valid question event", () => {
    const question = {
      id: "q-123",
      question: "Which option?",
      options: [
        { label: "A", description: "Option A" },
        { label: "B", description: "Option B" },
      ],
      conversation_id: "conv-123",
    };

    expect(question.id).toBe("q-123");
    expect(question.question).toBe("Which option?");
    expect(question.options).toHaveLength(2);
  });
});

describe("attachment structure", () => {
  it("creates valid file attachment", () => {
    const attachment = {
      id: "att-123",
      type: "file" as const,
      name: "test.txt",
      path: "/tmp/test.txt",
      size: 1024,
      mimeType: "text/plain",
    };

    expect(attachment.id).toBe("att-123");
    expect(attachment.type).toBe("file");
    expect(attachment.name).toBe("test.txt");
  });

  it("creates valid image attachment", () => {
    const attachment = {
      id: "att-456",
      type: "image" as const,
      name: "screenshot.png",
      path: "/tmp/screenshot.png",
      size: 50000,
      mimeType: "image/png",
      previewUrl: "data:image/png;base64,...",
    };

    expect(attachment.type).toBe("image");
    expect(attachment.previewUrl).toContain("data:image");
  });
});

describe("conversation management operations", () => {
  it("creates new conversation with default values", () => {
    let counter = 1;
    const createNewConversation = (name?: string) => {
      const id = `conv-${Date.now()}-${counter++}`;
      return {
        id,
        name: name || `Conversation ${counter}`,
        terminalLines: [],
        sessionId: null,
        connectionStatus: "disconnected" as const,
        workingDirectory: "",
        characterState: "idle" as const,
        isProcessing: false,
        grantedTools: new Set<string>(),
        pendingPermission: null,
        pendingQuestion: null,
        scrollPosition: -1,
        createdAt: new Date(),
        lastActivityAt: new Date(),
        attachments: [],
      };
    };

    const conv = createNewConversation("My Chat");
    expect(conv.name).toBe("My Chat");
    expect(conv.connectionStatus).toBe("disconnected");
    expect(conv.characterState).toBe("idle");
  });

  it("uses default name when not provided", () => {
    const counter = 5;
    const createNewConversation = (name?: string) => ({
      name: name || `Conversation ${counter}`,
    });

    const conv = createNewConversation();
    expect(conv.name).toBe("Conversation 5");
  });
});

describe("conversation history formatting", () => {
  it("formats user and assistant messages for history", () => {
    const lines = [
      { type: "user" as const, content: "Hello" },
      { type: "assistant" as const, content: "Hi there!" },
      { type: "system" as const, content: "Connected" },
      { type: "user" as const, content: "How are you?" },
    ];

    const relevantLines = lines.filter((line) => line.type === "user" || line.type === "assistant");

    const history = relevantLines
      .map((line) => {
        const role = line.type === "user" ? "User" : "Assistant";
        return `${role}: ${line.content}`;
      })
      .join("\n\n");

    expect(history).toContain("User: Hello");
    expect(history).toContain("Assistant: Hi there!");
    expect(history).toContain("User: How are you?");
    expect(history).not.toContain("Connected");
  });

  it("returns empty string for no messages", () => {
    const lines: Array<{ type: string; content: string }> = [];
    const relevantLines = lines.filter((line) => line.type === "user" || line.type === "assistant");

    expect(relevantLines.length).toBe(0);
    const history = relevantLines.length === 0 ? "" : "has content";
    expect(history).toBe("");
  });
});

describe("tool granting", () => {
  it("tracks granted tools with Set", () => {
    const grantedTools = new Set<string>();

    grantedTools.add("Read");
    grantedTools.add("Write");
    grantedTools.add("Bash");

    expect(grantedTools.has("Read")).toBe(true);
    expect(grantedTools.has("Write")).toBe(true);
    expect(grantedTools.has("Bash")).toBe(true);
    expect(grantedTools.has("Edit")).toBe(false);
    expect(grantedTools.size).toBe(3);
  });

  it("clears all granted tools", () => {
    const grantedTools = new Set<string>(["Read", "Write"]);
    expect(grantedTools.size).toBe(2);

    grantedTools.clear();
    expect(grantedTools.size).toBe(0);
  });
});

describe("scroll position handling", () => {
  it("uses -1 for auto-scroll (scroll to bottom)", () => {
    const scrollPosition = -1;
    const isAutoScroll = scrollPosition === -1;

    expect(isAutoScroll).toBe(true);
  });

  it("uses positive values for manual scroll position", () => {
    const scrollPosition: number = 500;
    const isAutoScroll = scrollPosition === -1;

    expect(isAutoScroll).toBe(false);
    expect(scrollPosition).toBeGreaterThan(0);
  });
});

describe("conversation deletion rules", () => {
  it("prevents deletion of last conversation", () => {
    const conversations = new Map([["conv-1", { id: "conv-1", name: "Main" }]]);

    const canDelete = conversations.size > 1;
    expect(canDelete).toBe(false);
  });

  it("allows deletion when multiple conversations exist", () => {
    const conversations = new Map([
      ["conv-1", { id: "conv-1", name: "Main" }],
      ["conv-2", { id: "conv-2", name: "Second" }],
    ]);

    const canDelete = conversations.size > 1;
    expect(canDelete).toBe(true);
  });

  it("switches to remaining conversation after deletion", () => {
    const conversations = new Map([
      ["conv-1", { id: "conv-1", name: "Main" }],
      ["conv-2", { id: "conv-2", name: "Second" }],
    ]);

    const activeId = "conv-1";
    conversations.delete(activeId);

    const remaining = Array.from(conversations.keys());
    expect(remaining).toEqual(["conv-2"]);
    expect(remaining[0]).toBe("conv-2");
  });
});

describe("activity timestamp tracking", () => {
  it("updates lastActivityAt on changes", () => {
    const before = new Date();

    // Simulate a small delay
    const after = new Date(before.getTime() + 100);

    expect(after.getTime()).toBeGreaterThan(before.getTime());
  });
});

describe("Map operations for conversations", () => {
  it("stores and retrieves conversations by ID", () => {
    const conversations = new Map<string, { id: string; name: string }>();

    conversations.set("conv-1", { id: "conv-1", name: "First" });
    conversations.set("conv-2", { id: "conv-2", name: "Second" });

    expect(conversations.get("conv-1")?.name).toBe("First");
    expect(conversations.get("conv-2")?.name).toBe("Second");
    expect(conversations.get("conv-3")).toBeUndefined();
  });

  it("checks if conversation exists", () => {
    const conversations = new Map([["conv-1", { id: "conv-1" }]]);

    expect(conversations.has("conv-1")).toBe(true);
    expect(conversations.has("conv-2")).toBe(false);
  });

  it("iterates over all conversations", () => {
    const conversations = new Map([
      ["conv-1", { id: "conv-1", name: "First" }],
      ["conv-2", { id: "conv-2", name: "Second" }],
    ]);

    const names: string[] = [];
    conversations.forEach((conv) => names.push(conv.name));

    expect(names).toContain("First");
    expect(names).toContain("Second");
  });
});

describe("conversation rename", () => {
  it("updates conversation name", () => {
    const conversation = { id: "conv-1", name: "Old Name", lastActivityAt: new Date() };

    conversation.name = "New Name";
    conversation.lastActivityAt = new Date();

    expect(conversation.name).toBe("New Name");
  });
});

describe("attachment management", () => {
  it("adds attachment to array", () => {
    const attachments: Array<{ id: string; name: string }> = [];

    attachments.push({ id: "att-1", name: "file1.txt" });
    expect(attachments).toHaveLength(1);

    attachments.push({ id: "att-2", name: "file2.txt" });
    expect(attachments).toHaveLength(2);
  });

  it("removes attachment by ID", () => {
    const attachments = [
      { id: "att-1", name: "file1.txt" },
      { id: "att-2", name: "file2.txt" },
    ];

    const filtered = attachments.filter((a) => a.id !== "att-1");
    expect(filtered).toHaveLength(1);
    expect(filtered[0].id).toBe("att-2");
  });

  it("clears all attachments", () => {
    const cleared: Array<{ id: string }> = [];
    expect(cleared).toHaveLength(0);
  });
});

describe("derived store behavior", () => {
  it("derives connection status from active conversation", () => {
    const activeConv = { connectionStatus: "connected" as const };
    const derivedStatus = activeConv?.connectionStatus || "disconnected";

    expect(derivedStatus).toBe("connected");
  });

  it("defaults to disconnected when no active conversation", () => {
    const activeConv = null as { connectionStatus?: string } | null;
    const derivedStatus = activeConv?.connectionStatus || "disconnected";

    expect(derivedStatus).toBe("disconnected");
  });

  it("derives terminal lines from active conversation", () => {
    const activeConv = {
      terminalLines: [
        { id: "1", content: "Hello" },
        { id: "2", content: "World" },
      ],
    };
    const derivedLines = activeConv?.terminalLines || [];

    expect(derivedLines).toHaveLength(2);
  });

  it("defaults to empty array when no active conversation", () => {
    const activeConv = null as { terminalLines?: Array<{ id: string; content: string }> } | null;
    const derivedLines = activeConv?.terminalLines || [];

    expect(derivedLines).toEqual([]);
  });
});

describe("line update operations", () => {
  it("updates line content by ID", () => {
    const lines = [
      { id: "line-1", content: "Original" },
      { id: "line-2", content: "Other" },
    ];

    const line = lines.find((l) => l.id === "line-1");
    if (line) {
      line.content = "Updated";
    }

    expect(lines[0].content).toBe("Updated");
    expect(lines[1].content).toBe("Other");
  });

  it("appends to line content", () => {
    const line = { id: "line-1", content: "Hello" };

    line.content += " World";

    expect(line.content).toBe("Hello World");
  });
});

describe("pending retry message", () => {
  it("stores and clears retry message", () => {
    let pendingRetryMessage: string | null = null;

    pendingRetryMessage = "Retry this message";
    expect(pendingRetryMessage).toBe("Retry this message");

    pendingRetryMessage = null;
    expect(pendingRetryMessage).toBeNull();
  });
});