import { and, eq } from "drizzle-orm";
import { NextResponse } from "next/server";
import { auth } from "@/app/(auth)/auth";
import {
  CANVAS_LAYOUT_REPLACE_BATCH_LIMIT,
  createCanvasLayoutReplaceBatch,
  getCanvasLayoutReplaceBatchActiveTaskId,
  getLatestCanvasLayoutReplaceBatchForUser,
  type CanvasLayoutReplaceBatchSource,
} from "@/lib/canvas/layout-replace-batch";
import {
  enqueueCanvasImageTask,
  ensureCanvasImageTaskActive,
} from "@/lib/canvas/image-task-queue";
import { db } from "@/lib/db";
import { canvasProject } from "@/lib/db/schema";
import { getPointsSystemConfig } from "@/lib/db/queries";
import { prepareFeaturePointsCharge } from "@/lib/points/feature-charge";
import { getImageToolCreditCost } from "@/lib/points/config";

export const maxDuration = 1200;

function normalizeHttpUrl(value: unknown) {
  const url = String(value || "").trim();
  return /^https?:\/\//i.test(url) ? url : "";
}

function normalizeUuid(value: unknown) {
  const id = String(value || "").trim();
  return /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i.test(id)
    ? id
    : "";
}

function normalizeSources(value: unknown): CanvasLayoutReplaceBatchSource[] {
  if (!Array.isArray(value)) return [];
  const seen = new Set<string>();
  const sources: CanvasLayoutReplaceBatchSource[] = [];
  for (const item of value) {
    if (!item || typeof item !== "object" || Array.isArray(item)) continue;
    const record = item as Record<string, unknown>;
    const sourceImageUrl = normalizeHttpUrl(record.sourceImageUrl);
    if (!sourceImageUrl || seen.has(sourceImageUrl)) continue;
    seen.add(sourceImageUrl);
    sources.push({
      sourceImageUrl,
      sourceKind: record.sourceKind === "upload" ? "upload" : "canvas",
      sourceNodeId: String(record.sourceNodeId || "").trim() || undefined,
      sourceTitle: String(record.sourceTitle || "").trim().slice(0, 256) || undefined,
    });
    if (sources.length >= CANVAS_LAYOUT_REPLACE_BATCH_LIMIT) break;
  }
  return sources;
}

async function getOwnedProject(projectId: string, userId: string) {
  const [project] = await db
    .select({ id: canvasProject.id })
    .from(canvasProject)
    .where(and(eq(canvasProject.id, projectId), eq(canvasProject.userId, userId)))
    .limit(1);
  return project || null;
}

export async function GET(request: Request) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
    }

    const { searchParams } = new URL(request.url);
    const projectId = normalizeUuid(searchParams.get("projectId"));
    const sourceNodeId = String(searchParams.get("sourceNodeId") || "").trim();
    if (!projectId) {
      return NextResponse.json(
        { success: false, error: "缺少有效的画布项目" },
        { status: 400 }
      );
    }
    if (!(await getOwnedProject(projectId, session.user.id))) {
      return NextResponse.json({ success: false, error: "画布不存在" }, { status: 404 });
    }

    let batch = await getLatestCanvasLayoutReplaceBatchForUser({
      projectId,
      userId: session.user.id,
      sourceNodeId: sourceNodeId || undefined,
    });
    const activeTaskId = batch
      ? getCanvasLayoutReplaceBatchActiveTaskId(batch)
      : null;
    if (activeTaskId) {
      await ensureCanvasImageTaskActive({
        taskId: activeTaskId,
        userId: session.user.id,
      });
      batch = await getLatestCanvasLayoutReplaceBatchForUser({
        projectId,
        userId: session.user.id,
        sourceNodeId: sourceNodeId || undefined,
      });
    }

    return NextResponse.json({ success: true, batch: batch || null });
  } catch (error) {
    console.error("[Canvas Layout Replace Batch][GET] Error:", error);
    return NextResponse.json(
      {
        success: false,
        error: error instanceof Error ? error.message : "查询批次失败",
      },
      { status: 500 }
    );
  }
}

export async function POST(request: Request) {
  try {
    const session = await auth();
    if (!session?.user?.id) {
      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
    }

    const body = await request.json().catch(() => ({}));
    const projectId = normalizeUuid(body?.projectId);
    const referenceImageUrl = normalizeHttpUrl(body?.referenceImageUrl);
    const sources = normalizeSources(body?.sources);
    if (!projectId || !(await getOwnedProject(projectId, session.user.id))) {
      return NextResponse.json({ success: false, error: "画布不存在" }, { status: 404 });
    }
    if (sources.length === 0) {
      return NextResponse.json(
        { success: false, error: "请至少添加一张待处理图片" },
        { status: 400 }
      );
    }
    if (!referenceImageUrl) {
      return NextResponse.json(
        { success: false, error: "请上传目标模版图" },
        { status: 400 }
      );
    }

    const pointsConfig = await getPointsSystemConfig();
    const perImageCost = getImageToolCreditCost(pointsConfig, "repaint");
    const totalCost = perImageCost * sources.length;
    const pointsCharge = await prepareFeaturePointsCharge({
      userId: session.user.id,
      unitCost: totalCost,
      reason: "image_repaint",
      modelId: "canvas-layout-replace-batch",
      note: `批量排版替换 ${sources.length} 张`,
      pointsConfig,
    });
    if (!pointsCharge.ok) {
      return NextResponse.json(pointsCharge.payload, { status: pointsCharge.status });
    }

    const created = await createCanvasLayoutReplaceBatch({
      userId: session.user.id,
      projectId,
      sources,
      referenceImageUrl,
      supplementalPrompt:
        typeof body?.supplementalPrompt === "string"
          ? body.supplementalPrompt
          : undefined,
      imageSize: typeof body?.imageSize === "string" ? body.imageSize : "2K",
      model: typeof body?.model === "string" ? body.model : undefined,
    });
    await enqueueCanvasImageTask(created.firstTaskId);

    if (pointsCharge.chargeable) {
      try {
        await pointsCharge.consume({
          note: `批量排版替换 ${sources.length} 张（${created.batchId}）`,
        });
      } catch (error) {
        console.error("[Points] Failed to consume layout batch points:", error);
      }
    }

    return NextResponse.json({
      success: true,
      batchId: created.batchId,
      firstTaskId: created.firstTaskId,
      sourceCount: sources.length,
      pointsCost: totalCost,
    });
  } catch (error) {
    console.error("[Canvas Layout Replace Batch][POST] Error:", error);
    return NextResponse.json(
      {
        success: false,
        error: error instanceof Error ? error.message : "创建批次失败",
      },
      { status: 500 }
    );
  }
}