import type { MessageSegment } from "./chat-data";

export interface SegmentView {
  readonly segment: MessageSegment;
  readonly isExpanded: boolean;
  readonly displayTitle: string;
  readonly displayStatus: string;
  readonly statusColor: string;
  readonly canExpand: boolean;
  readonly formattedContent?: string;
  readonly metadata?: SegmentMetadata;
}

export interface SegmentMetadata {
  readonly toolType?: "todo" | "console" | "file" | "default";
  readonly fileName?: string;
  readonly lineCount?: number;
  readonly errorMessage?: string;
  readonly duration?: number;
}

export interface TodoListView {
  readonly tasks: TodoTask[];
  readonly completedCount: number;
  readonly totalCount: number;
  readonly lastUpdated: number;
}

export interface TodoTask {
  readonly id: number;
  readonly description: string;
  readonly status: "pending" | "in_progress" | "completed";
  readonly emoji: string;
}

export function createSegmentView(
  segment: MessageSegment,
  isExpanded: boolean = false,
): SegmentView {
  const statusColors: Record<string, string> = {
    pending: "rgba(255, 193, 7, 0.8)",
    running: "rgba(33, 150, 243, 0.8)",
    completed: "rgba(76, 175, 80, 0.8)",
    error: "rgba(244, 67, 54, 0.8)",
  };

  const displayTitle = getSegmentTitle(segment);
  const displayStatus = getSegmentStatus(segment);
  const statusColor =
    statusColors[segment.toolStatus || "pending"] || "rgba(156, 163, 175, 0.8)";
  const canExpand =
    segment.type === "tool-invocation" || segment.type === "tool-result";

  return {
    segment,
    isExpanded,
    displayTitle,
    displayStatus,
    statusColor,
    canExpand,
    metadata: extractMetadata(segment),
  };
}

function getSegmentTitle(segment: MessageSegment): string {
  if (segment.type === "text") {
    return "Text";
  }

  if (segment.type === "reasoning") {
    return "Reasoning";
  }

  if (segment.toolName) {
    const toolNames: Record<string, string> = {
      plan_tasks: "📋 Plan Tasks",
      update_task: "✏️ Update Task",
      view_tasks: "👀 View Tasks",
      observe_console: "📺 Console Output",
    };
    return toolNames[segment.toolName] || `🔧 ${segment.toolName}`;
  }

  return "Tool";
}

function getSegmentStatus(segment: MessageSegment): string {
  if (segment.streaming) {
    return "streaming...";
  }

  if (segment.toolStatus) {
    const statusLabels: Record<string, string> = {
      pending: "Pending",
      running: "Running",
      completed: "Completed",
      error: "Error",
    };
    return statusLabels[segment.toolStatus] || segment.toolStatus;
  }

  if (segment.endTime && segment.startTime) {
    const duration = segment.endTime - segment.startTime;
    if (duration < 1000) {
      return `${duration}ms`;
    }
    return `${(duration / 1000).toFixed(1)}s`;
  }

  return "";
}

function extractMetadata(segment: MessageSegment): SegmentMetadata {
  let toolType: SegmentMetadata["toolType"];
  let fileName: string | undefined;
  let errorMessage: string | undefined;
  let duration: number | undefined;
  let lineCount: number | undefined;

  if (segment.toolName?.includes("task")) {
    toolType = "todo";
  } else if (segment.toolName === "observe_console") {
    toolType = "console";
  } else if (segment.toolName?.includes("file")) {
    toolType = "file";
    if (segment.toolArgs?.path) {
      fileName = segment.toolArgs.path as string;
    }
  } else if (segment.toolName) {
    toolType = "default";
  }

  if (segment.toolError) {
    errorMessage = segment.toolError;
  }

  if (segment.endTime && segment.startTime) {
    duration = segment.endTime - segment.startTime;
  }

  if (segment.toolOutput) {
    lineCount = segment.toolOutput.split("\n").length;
  }

  return {
    toolType,
    fileName,
    errorMessage,
    duration,
    lineCount,
  };
}

export function parseTodoList(content: string): TodoListView | null {
  const lines = content.split("\n");
  const tasks: TodoTask[] = [];

  for (const line of lines) {
    const match = line.match(
      /([⏳🔄✅])\s*\[(\d+)\]\s*(.+?)\s*\((pending|in_progress|completed)\)/u,
    );
    if (match) {
      const [, emoji, id, description, status] = match;
      tasks.push({
        id: parseInt(id, 10),
        description: description.trim(),
        status: status as TodoTask["status"],
        emoji,
      });
    }
  }

  if (tasks.length === 0) {
    return null;
  }

  const completedCount = tasks.filter((t) => t.status === "completed").length;

  return {
    tasks,
    completedCount,
    totalCount: tasks.length,
    lastUpdated: Date.now(),
  };
}