import "server-only";

import type {
  ConversationActionResolution,
  PendingGridConfirmation,
} from "@/lib/ai/conversation-action-resolver";
import { isExplicitPromptOptimizationRequest } from "@/lib/ai/smart-analyzer";
import { detectStoryboardCommandIntent } from "@/lib/video-agent/storyboard-command-interpreter";

export type TaskBoundaryType =
  | "greeting"
  | "chat"
  | "analysis_only"
  | "prompt_only"
  | "execution_image"
  | "execution_video"
  | "workflow_followup";

export type TaskBoundaryMode = "new" | "continue" | "revise" | "confirm" | "cancel";

export interface TaskBoundaryDecision {
  taskType: TaskBoundaryType;
  taskMode: TaskBoundaryMode;
  shouldUseCanvasContext: boolean;
  shouldUseHistoryImages: boolean;
  shouldUseWorkflowMemory: boolean;
  shouldAllowExecution: boolean;
  confidence: number;
  reason: string;
}

function normalizeCompactText(text: string) {
  return String(text || "").toLowerCase().replace(/\s+/g, "").trim();
}

export function isPureGreetingTurnRequest(text: string): boolean {
  const normalized = normalizeCompactText(text);
  if (!normalized) return false;

  return /^(你好|您好|hello|hi|嗨|哈喽|在吗|早上好|中午好|下午好|晚上好|深夜好|谢谢|感谢|收到|好的|ok|okay|明白了|了解了)$/.test(
    normalized,
  );
}

function isLikelyVideoExecutionRequest(text: string): boolean {
  const normalized = normalizeCompactText(text);
  if (!normalized) return false;

  return /图生视频|文生视频|视频生成|生成视频|做视频|做成视频|开始生成视频|让.*动起来|变成视频|视频/.test(
    normalized,
  );
}

function isLikelyImageExecutionRequest(text: string): boolean {
  const normalized = normalizeCompactText(text);
  if (!normalized) return false;
  if (/不要生图|先别生图|不需要生图|不要生成|别生成|只要提示词|仅给提示词|先给提示词/.test(normalized)) {
    return false;
  }

  const countToken = "(?:一|两|二|三|四|五|六|七|八|九|十|[1-9]\\d?)";
  const visualTarget =
    "(?:图|图片|海报|头像|插画|场景|主图|产品图|商品图|电商图|壁纸|封面|logo|图标)";
  const createVisualTarget = new RegExp(
    `(?:生成|创作|创建|制作|设计|做|出|画|绘制)${countToken}?张?.{0,32}${visualTarget}`,
  );
  const drawSubject = new RegExp(
    `(?:画|绘制|生成|创作|创建)${countToken}?(?:只|个|位|幅|张)?.{0,24}(?:小猫|猫咪|猫|狗|人物|角色|ip|头像|logo|图标|插画)`,
  );
  const continueVariants = new RegExp(
    `(?:再来|再出|再做|再给我|补|多来|继续生成|继续出)${countToken}?张`,
  );

  return (
    /生图|生成图片|出图|画一张|帮我画|做图|做一张图|重新生成|再来一张|执行生成|开始生成|生成出来|生成一只|生成一个|生成一张|生成一幅|生成一版|帮我生成.*(?:图|图片|海报|头像|插画|场景|小猫|猫咪|人物|产品图)|给我生成.*(?:图|图片|海报|头像|插画|场景|小猫|猫咪|人物|产品图)/.test(
      normalized,
    ) ||
    createVisualTarget.test(normalized) ||
    drawSubject.test(normalized) ||
    continueVariants.test(normalized) ||
    /参考.*生成|按这个风格生成|以这张图为灵感生成|仿照.*生成|同风格再来|同样风格再来/.test(
      normalized,
    )
  );
}

function isLikelyChatOnlyRequest(text: string): boolean {
  const normalized = normalizeCompactText(text);
  if (!normalized) return false;

  return /你能做什么|你会什么|你可以做什么|你能帮我做什么|你能干什么|你可以帮我做什么|介绍一下你自己|介绍一下自己|说说你的能力|你有哪些功能|你有什么功能|怎么用|怎么玩|如何使用|帮助说明|帮助手册|功能介绍/.test(
    normalized,
  );
}

function isLikelyAnalysisOnlyRequest(text: string, hasImageContext: boolean): boolean {
  if (!hasImageContext) return false;
  const normalized = normalizeCompactText(text);
  if (!normalized) return false;

  return /分析|看图|看看|识别|拆解|提炼|整理|归纳|总结|描述|解释|判断|帮我看看|帮我分析|帮我判断|是什么|适合吗|怎么样|评价/.test(
    normalized,
  );
}

function resolveStoryboardTaskMode(params: {
  text: string;
  hasPendingGridConfirmation: boolean;
  hasActiveStoryboardTask: boolean;
}): TaskBoundaryMode {
  if (!params.hasPendingGridConfirmation && !params.hasActiveStoryboardTask) {
    return "continue";
  }

  const intent = detectStoryboardCommandIntent(params.text);
  switch (intent) {
    case "confirm":
      return "confirm";
    case "revise":
      return "revise";
    case "cancel":
      return "cancel";
    case "unclear":
    default:
      return "continue";
  }
}

export function classifyTaskBoundary(params: {
  text: string;
  actionResolution: ConversationActionResolution;
  hasCurrentImageInput: boolean;
  hasCanvasSelection: boolean;
  pendingGridConfirmation?: PendingGridConfirmation | null;
  hasActiveStoryboardTask: boolean;
}) {
  const hasWorkflowImageContext =
    params.actionResolution.kind === "image_edit_followup" ||
    params.actionResolution.kind === "image_generation_followup" ||
    params.actionResolution.kind === "prompt_carry_forward";
  const hasImageContext =
    params.hasCurrentImageInput || params.hasCanvasSelection || hasWorkflowImageContext;

  if (isPureGreetingTurnRequest(params.text) && !params.hasCurrentImageInput) {
    return {
      taskType: "greeting",
      taskMode: "new",
      shouldUseCanvasContext: false,
      shouldUseHistoryImages: false,
      shouldUseWorkflowMemory: false,
      shouldAllowExecution: false,
      confidence: 0.99,
      reason: "pure_greeting_turn",
    } satisfies TaskBoundaryDecision;
  }

  if (isExplicitPromptOptimizationRequest(params.text)) {
    return {
      taskType: "prompt_only",
      taskMode: "new",
      shouldUseCanvasContext: !params.hasCurrentImageInput && params.hasCanvasSelection,
      shouldUseHistoryImages: !params.hasCurrentImageInput && !params.hasCanvasSelection,
      shouldUseWorkflowMemory: false,
      shouldAllowExecution: false,
      confidence: 0.97,
      reason: "explicit_prompt_only_request",
    } satisfies TaskBoundaryDecision;
  }

  if (isLikelyAnalysisOnlyRequest(params.text, hasImageContext)) {
    return {
      taskType: "analysis_only",
      taskMode: "new",
      shouldUseCanvasContext: params.hasCanvasSelection,
      shouldUseHistoryImages: !params.hasCurrentImageInput && !params.hasCanvasSelection,
      shouldUseWorkflowMemory: false,
      shouldAllowExecution: false,
      confidence: 0.9,
      reason: "analysis_only_request",
    } satisfies TaskBoundaryDecision;
  }

  if (isLikelyChatOnlyRequest(params.text)) {
    return {
      taskType: "chat",
      taskMode: "new",
      shouldUseCanvasContext: false,
      shouldUseHistoryImages: false,
      shouldUseWorkflowMemory: false,
      shouldAllowExecution: false,
      confidence: 0.96,
      reason: "chat_only_request",
    } satisfies TaskBoundaryDecision;
  }

  switch (params.actionResolution.kind) {
    case "grid_confirmation_followup":
    case "active_storyboard_followup":
      return {
        taskType: "workflow_followup",
        taskMode: resolveStoryboardTaskMode({
          text: params.text,
          hasPendingGridConfirmation: Boolean(params.pendingGridConfirmation),
          hasActiveStoryboardTask: params.hasActiveStoryboardTask,
        }),
        shouldUseCanvasContext: params.hasCanvasSelection,
        shouldUseHistoryImages: !params.hasCurrentImageInput,
        shouldUseWorkflowMemory: true,
        shouldAllowExecution: true,
        confidence: 0.95,
        reason: params.actionResolution.kind,
      } satisfies TaskBoundaryDecision;
    case "image_edit_followup":
    case "image_generation_followup":
      return {
        taskType: "workflow_followup",
        taskMode: "continue",
        shouldUseCanvasContext: params.hasCanvasSelection,
        shouldUseHistoryImages: !params.hasCurrentImageInput,
        shouldUseWorkflowMemory: true,
        shouldAllowExecution: true,
        confidence: 0.92,
        reason: params.actionResolution.kind,
      } satisfies TaskBoundaryDecision;
    case "prompt_carry_forward":
      return {
        taskType: "execution_image",
        taskMode: "continue",
        shouldUseCanvasContext: params.hasCanvasSelection,
        shouldUseHistoryImages: !params.hasCurrentImageInput,
        shouldUseWorkflowMemory: true,
        shouldAllowExecution: true,
        confidence: 0.93,
        reason: "prompt_carry_forward_execution",
      } satisfies TaskBoundaryDecision;
    case "default":
    default:
      break;
  }

  if (isLikelyVideoExecutionRequest(params.text)) {
    return {
      taskType: "execution_video",
      taskMode: "new",
      shouldUseCanvasContext: params.hasCanvasSelection,
      shouldUseHistoryImages: false,
      shouldUseWorkflowMemory: false,
      shouldAllowExecution: true,
      confidence: 0.88,
      reason: "explicit_video_execution_request",
    } satisfies TaskBoundaryDecision;
  }

  if (isLikelyImageExecutionRequest(params.text)) {
    return {
      taskType: "execution_image",
      taskMode: "new",
      shouldUseCanvasContext: params.hasCanvasSelection,
      shouldUseHistoryImages: false,
      shouldUseWorkflowMemory: false,
      shouldAllowExecution: true,
      confidence: 0.87,
      reason: "explicit_image_execution_request",
    } satisfies TaskBoundaryDecision;
  }

  return {
    taskType: "chat",
    taskMode: "new",
    shouldUseCanvasContext: false,
    shouldUseHistoryImages: false,
    shouldUseWorkflowMemory: false,
    shouldAllowExecution: false,
    confidence: 0.7,
    reason: "default_chat_turn",
  } satisfies TaskBoundaryDecision;
}