import { NextRequest, NextResponse } from "next/server"
import { prisma } from "@/lib/prisma"
import { requireFrontendServiceToken } from "@/lib/api/public-auth"
import {
  BLOG_PAGE_ENTITY_KEY,
  BLOG_PAGE_LOCALE_CODES,
  type BlogPageLocaleCode,
} from "@/lib/pages/blog/locales"
import {
  buildBlogPageImageByLocale,
  normalizeBlogPageLocaleImagesForStorage,
  resolveBlogPageDefaultImage,
} from "@/lib/pages/blog/hero-fallback"
import { parseHeroJsonForStorage } from "@/lib/pages/blog/validate-payload"
import type { BlogPageFormStateShape } from "@/lib/pages/blog/form-types"

export const dynamic = "force-dynamic"
export const revalidate = 0

const NO_CACHE_HEADERS = {
  "Cache-Control": "no-store, no-cache, must-revalidate, proxy-revalidate",
  Pragma: "no-cache",
  Expires: "0",
}

function rowToFormState(heroJson: unknown): BlogPageFormStateShape {
  let parsed: unknown = heroJson
  if (typeof heroJson === "string") {
    try {
      parsed = JSON.parse(heroJson)
    } catch {
      parsed = undefined
    }
  }
  return { hero: parseHeroJsonForStorage(parsed).data }
}

export async function GET(req: NextRequest) {
  const authError = requireFrontendServiceToken(req)
  if (authError) return authError

  try {
    const rows = await prisma.blogPageLocale.findMany({
      where: { entityKey: BLOG_PAGE_ENTITY_KEY },
      orderBy: { locale: "asc" },
    })

    const locales: Partial<Record<BlogPageLocaleCode, BlogPageFormStateShape>> = {}
    for (const row of rows) {
      if (!BLOG_PAGE_LOCALE_CODES.includes(row.locale as BlogPageLocaleCode)) continue
      const code = row.locale as BlogPageLocaleCode
      locales[code] = rowToFormState(row.heroJson)
    }

    const normalizedLocales = normalizeBlogPageLocaleImagesForStorage(locales)
    const defaultImage = resolveBlogPageDefaultImage(normalizedLocales)
    const imageByLocale = buildBlogPageImageByLocale(normalizedLocales)

    return NextResponse.json(
      {
        success: true as const,
        locales: normalizedLocales,
        defaultImage,
        imageByLocale,
      },
      { headers: NO_CACHE_HEADERS }
    )
  } catch (error) {
    console.error("[public/blog-page] GET error:", error)
    return NextResponse.json(
      { success: false as const, error: "Failed to load blog page" },
      { status: 500, headers: NO_CACHE_HEADERS }
    )
  }
}