import type { DirectAgentToolCapability } from "@/lib/ai/runtime/direct-agent-execution";

export type CanvasAgentComposerMode = "agent" | "image" | "video" | "detail" | "clawd";
export type CanvasAgentEntryMode = "auto" | "preset";

export interface CanvasAgentRequestPolicy {
  effectiveSelectedChatModel: string;
  shouldForceToolOrchestration: boolean;
  reason: string | null;
}

export interface CanvasAgentTargetPreference {
  shouldPreferLatestResult: boolean;
  shouldPreferWorkingMemoryTarget: boolean;
  confidence: number;
  reason: string | null;
}

const DEICTIC_TARGET_REGEX =
  /(这张图|这只|这个|这款|这套|当前这张|当前这个|当前这只|这一张|这一只|这个产品|这个物体|这只猫|这只狗)/i;

const ACTIONABLE_IMAGE_EDIT_REGEX =
  /(抠图|去背景|透明背景|去背|扣图|抠出|扣出|抠出来|扣出来|移除背景|去水印|水印|去logo|去\s*logo|移除logo|去除logo|换背景|改背景|背景换成|背景改成|白底|纯色背景|替换.*背景|变清晰|高清|锐化|降噪|提升质量|修复|清晰化|扩展|拓展|延伸|扩图|outpainting|拓宽|扩大|多视角|换视角|改视角|视角变体|新角度|换角度|改角度|去除|消除|擦掉|删除|移除|p掉|重绘|风格化|卡通化|动漫风|油画风|调色|调整颜色|亮度|对比度|饱和度|缩放|放大|缩小|调整尺寸|裁剪|resize|crop|修图|p图|改图|调图|编辑.*图|优化.*图|重做|再调整|继续改|继续调|处理)/i;

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

export function hasCanvasAgentDeicticTarget(text: string) {
  return DEICTIC_TARGET_REGEX.test(String(text || ""));
}

export function hasCanvasAgentActionableImageEditIntent(text: string) {
  return ACTIONABLE_IMAGE_EDIT_REGEX.test(String(text || ""));
}

export function inferCanvasAgentImageEditCapability(
  text: string,
): DirectAgentToolCapability | null {
  const normalizedText = normalizeCanvasAgentRequestText(text);
  if (!normalizedText) return null;
  if (/去水印|水印|去logo|移除logo|去除logo/.test(normalizedText)) {
    return "remove_watermark";
  }
  if (/抠图|去背景|透明背景|去背|扣图|抠出|扣出|抠出来|扣出来|移除背景/.test(normalizedText)) {
    return "remove_background";
  }
  if (/多视角|换视角|改视角|视角变体|新角度|换角度|改角度|侧面|侧视|背面|背后|俯视|俯拍|仰视|仰拍|低机位|高机位/.test(normalizedText)) {
    return "angle_variant";
  }
  if (/扩展|拓展|延伸|扩图|outpainting|拓宽|扩大|比例|画幅|竖版|横版|竖图|横图|9:16|16:9|1:1/.test(normalizedText)) {
    return "extend";
  }
  if (/调整尺寸|裁剪|resize|crop|缩放|放大|缩小/.test(normalizedText)) {
    return "resize";
  }
  if (/局部|框选|选区|区域|涂抹|蒙版/.test(normalizedText)) {
    return "local_edit";
  }
  if (/高清|清晰|锐化|降噪|提升质量|修复|清晰化/.test(normalizedText)) {
    return "enhance";
  }
  if (hasCanvasAgentActionableImageEditIntent(text)) {
    return "generic_edit";
  }
  return null;
}

export function resolveCanvasAgentRequestPolicy(params: {
  composerMode?: string | null;
  agentEntryMode?: string | null;
  selectedChatModel?: string | null;
  hasCanvasControlIntentFastPath?: boolean;
}): CanvasAgentRequestPolicy {
  const composerMode = String(params.composerMode || "").trim();
  const agentEntryMode = String(params.agentEntryMode || "").trim();
  const selectedChatModel = String(params.selectedChatModel || "").trim() || "auto";
  const isAgentAutoComposer = composerMode === "agent" && agentEntryMode !== "preset";
  const shouldForceToolOrchestration =
    isAgentAutoComposer || Boolean(params.hasCanvasControlIntentFastPath);

  if (isAgentAutoComposer) {
    return {
      effectiveSelectedChatModel: "auto",
      shouldForceToolOrchestration: true,
      reason: "agent_auto_composer",
    };
  }

  if (params.hasCanvasControlIntentFastPath) {
    return {
      effectiveSelectedChatModel: selectedChatModel,
      shouldForceToolOrchestration: true,
      reason: "canvas_control_fast_path",
    };
  }

  return {
    effectiveSelectedChatModel: selectedChatModel,
    shouldForceToolOrchestration,
    reason: null,
  };
}

export function resolveCanvasAgentTargetPreference(params: {
  text: string;
  selectedImageCount: number;
  latestResultImageCount: number;
  workingMemoryTargetImageCount: number;
}): CanvasAgentTargetPreference {
  const hasDeicticTarget = hasCanvasAgentDeicticTarget(params.text);
  const hasEditIntent = hasCanvasAgentActionableImageEditIntent(params.text);
  const selectedImageCount = Math.max(0, Math.round(params.selectedImageCount || 0));
  const latestResultImageCount = Math.max(
    0,
    Math.round(params.latestResultImageCount || 0),
  );
  const workingMemoryTargetImageCount = Math.max(
    0,
    Math.round(params.workingMemoryTargetImageCount || 0),
  );

  if (!hasDeicticTarget || !hasEditIntent || selectedImageCount > 0) {
    return {
      shouldPreferLatestResult: false,
      shouldPreferWorkingMemoryTarget: false,
      confidence: 0,
      reason: null,
    };
  }

  if (latestResultImageCount > 0) {
    return {
      shouldPreferLatestResult: true,
      shouldPreferWorkingMemoryTarget: false,
      confidence: 90,
      reason: "deictic_edit_prefers_latest_result",
    };
  }

  if (workingMemoryTargetImageCount > 0) {
    return {
      shouldPreferLatestResult: false,
      shouldPreferWorkingMemoryTarget: true,
      confidence: 86,
      reason: "deictic_edit_uses_working_memory_target",
    };
  }

  return {
    shouldPreferLatestResult: false,
    shouldPreferWorkingMemoryTarget: false,
    confidence: 0,
    reason: null,
  };
}