import { Elysia, t } from "elysia";
import type { Prisma } from "@prisma/client";
import prisma from "../lib/prisma";
import {
  defaultCategorySections,
  createCategorySection,
  validateCategorySectionPayload,
} from "../lib/categorySections";
import { hydrateSectionPayload } from "./pages";

function summarizeValidationIssues(issues: any[]) {
  return issues.map((issue) => ({
    path: issue.path?.join(".") || "(root)",
    message: issue.message,
    code: issue.code,
  }));
}

export const categorySectionsRoute = new Elysia({ prefix: "/categories" })
  // Get all sections for a category
  .get("/:id/sections", async ({ params, query, status }) => {
    const id = parseInt(params.id);
    if (isNaN(id)) return status(400, { message: "Invalid category ID" });

    const category = await prisma.category.findUnique({
      where: { id, deletedAt: null },
      select: { id: true },
    });
    if (!category) return status(404, { message: "Category not found" });

    const includeInactive = query.includeInactive === "true";
    const lang = query.lang || "th";
    const sections = await prisma.categorySection.findMany({
      where: {
        categoryId: id,
        ...(includeInactive ? {} : { isActive: true }),
      },
      orderBy: [{ order: "asc" }, { id: "asc" }],
    });

    return await Promise.all(
      sections.map((section: any) => hydrateSectionPayload(section, lang))
    );
  })

  // Seed default sections
  .post("/:id/sections/seed-default", async ({ params, status }) => {
    const id = parseInt(params.id);
    if (isNaN(id)) return status(400, { message: "Invalid category ID" });

    const category = await prisma.category.findUnique({
      where: { id, deletedAt: null },
      select: { id: true },
    });
    if (!category) return status(404, { message: "Category not found" });

    const existingCount = await prisma.categorySection.count({
      where: { categoryId: id },
    });
    if (existingCount > 0) {
      return status(409, {
        success: false,
        message: "Category sections already exist",
      });
    }

    await prisma.categorySection.createMany({
      data: defaultCategorySections(id),
    });

    const sections = await prisma.categorySection.findMany({
      where: { categoryId: id },
      orderBy: [{ order: "asc" }, { id: "asc" }],
    });

    return { success: true, sections };
  })

  // Create a new section
  .post("/:id/sections", async ({ params, body, status }) => {
    const id = parseInt(params.id);
    if (isNaN(id)) return status(400, { message: "Invalid category ID" });

    const payload = body as any;
    const type = String(payload.type || "").toUpperCase();
    const sectionPayload = payload.payload || {};
    const validationResult = validateCategorySectionPayload(type, sectionPayload);
    if (!validationResult.success) {
      return status(400, {
        success: false,
        message: "Invalid category section payload",
        issues: summarizeValidationIssues(validationResult.issues || []),
      });
    }

    const category = await prisma.category.findUnique({
      where: { id, deletedAt: null },
      select: { id: true },
    });
    if (!category) return status(404, { message: "Category not found" });

    const section = await prisma.$transaction((tx: Prisma.TransactionClient) =>
      createCategorySection(tx, {
        categoryId: id,
        type: validationResult.type,
        payload: validationResult.data,
        ...(Number.isFinite(Number(payload.order)) ? { order: Number(payload.order) } : {}),
        isActive: payload.isActive !== false,
        isLocked: Boolean(payload.isLocked),
      })
    );

    return { success: true, section };
  })

  // Update a section
  .put("/sections/:sectionId", async ({ params, body, status }) => {
    const sectionId = parseInt(params.sectionId);
    if (isNaN(sectionId)) return status(400, { message: "Invalid section ID" });

    const existing = await prisma.categorySection.findUnique({
      where: { id: sectionId },
    });
    if (!existing) return status(404, { message: "Category section not found" });

    const payload = body as any;
    const type = String(payload.type || existing.type).toUpperCase();
    const sectionPayload = payload.payload === undefined ? existing.payload : payload.payload;
    const validationResult = validateCategorySectionPayload(type, sectionPayload);
    if (!validationResult.success) {
      return status(400, {
        success: false,
        message: "Invalid category section payload",
        issues: summarizeValidationIssues(validationResult.issues || []),
      });
    }

    const validatedType = validationResult.type;
    if (existing.isLocked) {
      if (payload.type && validatedType !== existing.type) {
        return status(409, {
          success: false,
          message: "Locked category sections cannot change type",
        });
      }
      if (payload.isActive === false) {
        return status(409, {
          success: false,
          message: "Locked category sections cannot be hidden",
        });
      }
      if (payload.isLocked === false) {
        return status(409, {
          success: false,
          message: "Locked category sections cannot be unlocked",
        });
      }
    }

    const section = await prisma.categorySection.update({
      where: { id: sectionId },
      data: {
        type: validatedType,
        payload: validationResult.data,
        ...(payload.order !== undefined ? { order: Number(payload.order) } : {}),
        ...(payload.isActive !== undefined ? { isActive: Boolean(payload.isActive) } : {}),
        ...(payload.isLocked !== undefined ? { isLocked: Boolean(payload.isLocked) } : {}),
      },
    });

    return { success: true, section };
  })

  // Reorder sections
  .put("/:id/sections/reorder", async ({ params, body, status }) => {
    const id = parseInt(params.id);
    if (isNaN(id)) return status(400, { message: "Invalid category ID" });

    const items = (body as any)?.sections;
    if (!Array.isArray(items)) return status(400, { message: "sections must be an array" });

    await prisma.$transaction(
      items.map((item: any, index: number) =>
        prisma.categorySection.updateMany({
          where: { id: Number(item.id), categoryId: id },
          data: {
            order: Number.isFinite(Number(item.order)) ? Number(item.order) : index + 1,
          },
        })
      )
    );

    const sections = await prisma.categorySection.findMany({
      where: { categoryId: id },
      orderBy: [{ order: "asc" }, { id: "asc" }],
    });

    return { success: true, sections };
  })

  // Delete a section
  .delete("/sections/:sectionId", async ({ params, status }) => {
    const sectionId = parseInt(params.sectionId);
    if (isNaN(sectionId)) return status(400, { message: "Invalid section ID" });

    const existing = await prisma.categorySection.findUnique({
      where: { id: sectionId },
    });
    if (!existing) return status(404, { message: "Category section not found" });
    if (existing.isLocked) {
      return status(409, {
        success: false,
        message: "Locked category sections cannot be deleted",
      });
    }

    await prisma.categorySection.delete({ where: { id: sectionId } });
    return { success: true };
  });