import {
  createNavigationItemInputSchema,
  createNavigationMenuInputSchema,
  createPageInputSchema,
  updateNavigationItemInputSchema,
  updateNavigationMenuInputSchema,
  updatePageInputSchema,
  upsertPageTranslationInputSchema,
} from "@cms/content"
import { z } from "zod"

import { db } from "./client"

export type PublicNavigationItem = {
  id: string
  label: string
  href: string
  children: PublicNavigationItem[]
}

const supportedLocaleSchema = z.enum(["de", "en", "es", "fr"])
const upsertNavigationItemTranslationInputSchema = z.object({
  navigationItemId: z.string().uuid(),
  locale: supportedLocaleSchema,
  label: z.string().min(1).max(180),
})

function resolvePublishedAt(status: string): Date | null {
  return status === "published" ? new Date() : null
}

export async function listPages(limit = 50) {
  return db.page.findMany({
    orderBy: [{ updatedAt: "desc" }],
    take: limit,
  })
}

export async function listPublishedPageSlugs() {
  const pages = await db.page.findMany({
    where: { status: "published" },
    orderBy: { updatedAt: "desc" },
    select: {
      slug: true,
      updatedAt: true,
    },
  })

  return pages
}

export async function getPageById(id: string) {
  return db.page.findUnique({
    where: { id },
  })
}

export async function getPublishedPageBySlug(slug: string) {
  return db.page.findFirst({
    where: {
      slug,
      status: "published",
    },
  })
}

export async function getPublishedPageBySlugForLocale(slug: string, locale: string) {
  const page = await db.page.findFirst({
    where: {
      slug,
      status: "published",
    },
    include: {
      translations: {
        where: {
          locale,
        },
        take: 1,
      },
    },
  })

  if (!page) {
    return null
  }

  const translation = page.translations[0]

  return {
    ...page,
    title: translation?.title ?? page.title,
    summary: translation?.summary ?? page.summary,
    content: translation?.content ?? page.content,
    seoTitle: translation?.seoTitle ?? page.seoTitle,
    seoDescription: translation?.seoDescription ?? page.seoDescription,
  }
}

export async function createPage(input: unknown) {
  const payload = createPageInputSchema.parse(input)

  return db.page.create({
    data: {
      ...payload,
      publishedAt: resolvePublishedAt(payload.status),
    },
  })
}

export async function updatePage(input: unknown) {
  const payload = updatePageInputSchema.parse(input)
  const { id, ...data } = payload

  return db.page.update({
    where: { id },
    data: {
      ...data,
      publishedAt:
        data.status === undefined ? undefined : data.status === "published" ? new Date() : null,
    },
  })
}

export async function deletePage(id: string) {
  return db.page.delete({
    where: { id },
  })
}

export async function upsertPageTranslation(input: unknown) {
  const payload = upsertPageTranslationInputSchema.parse(input)
  const { pageId, locale, ...data } = payload

  return db.pageTranslation.upsert({
    where: {
      pageId_locale: {
        pageId,
        locale,
      },
    },
    create: {
      pageId,
      locale,
      ...data,
    },
    update: data,
  })
}

export async function listPageTranslations(pageId: string) {
  return db.pageTranslation.findMany({
    where: { pageId },
    orderBy: [{ locale: "asc" }],
  })
}

export async function listNavigationMenus() {
  return db.navigationMenu.findMany({
    orderBy: [{ location: "asc" }, { name: "asc" }],
    include: {
      items: {
        orderBy: [{ sortOrder: "asc" }, { label: "asc" }],
        include: {
          page: {
            select: {
              id: true,
              title: true,
              slug: true,
            },
          },
          translations: {
            orderBy: [{ locale: "asc" }],
          },
        },
      },
    },
  })
}

function resolveNavigationHref(item: {
  href: string | null
  page: {
    slug: string
    status: string
  } | null
}): string | null {
  if (item.href) {
    return item.href
  }

  if (item.page?.status === "published") {
    return item.page.slug === "home" ? "/" : `/${item.page.slug}`
  }

  return null
}

export async function listPublicNavigation(
  location = "header",
  locale?: string,
): Promise<PublicNavigationItem[]> {
  const normalizedLocale = locale ? supportedLocaleSchema.safeParse(locale).data : undefined

  const menu = await db.navigationMenu.findFirst({
    where: {
      location,
      isVisible: true,
    },
    orderBy: { updatedAt: "desc" },
    include: {
      items: {
        where: {
          isVisible: true,
        },
        orderBy: [{ sortOrder: "asc" }, { label: "asc" }],
        include: {
          page: {
            select: {
              slug: true,
              status: true,
            },
          },
          translations: normalizedLocale
            ? {
                where: { locale: normalizedLocale },
                take: 1,
              }
            : false,
        },
      },
    },
  })

  if (!menu) {
    return []
  }

  const itemMap = new Map<
    string,
    {
      id: string
      label: string
      href: string
      parentId: string | null
      children: PublicNavigationItem[]
    }
  >()

  for (const item of menu.items) {
    const href = resolveNavigationHref(item)

    if (!href) {
      continue
    }

    itemMap.set(item.id, {
      id: item.id,
      label: item.translations?.[0]?.label ?? item.label,
      href,
      parentId: item.parentId,
      children: [],
    })
  }

  const roots: PublicNavigationItem[] = []

  for (const entry of itemMap.values()) {
    if (entry.parentId) {
      const parent = itemMap.get(entry.parentId)

      if (parent) {
        parent.children.push({
          id: entry.id,
          label: entry.label,
          href: entry.href,
          children: entry.children,
        })
        continue
      }
    }

    roots.push({
      id: entry.id,
      label: entry.label,
      href: entry.href,
      children: entry.children,
    })
  }

  return roots
}

export async function createNavigationMenu(input: unknown) {
  const payload = createNavigationMenuInputSchema.parse(input)

  return db.navigationMenu.create({
    data: payload,
  })
}

export async function updateNavigationMenu(input: unknown) {
  const payload = updateNavigationMenuInputSchema.parse(input)
  const { id, ...data } = payload

  return db.navigationMenu.update({
    where: { id },
    data,
  })
}

export async function deleteNavigationMenu(id: string) {
  return db.navigationMenu.delete({
    where: { id },
  })
}

export async function createNavigationItem(input: unknown) {
  const payload = createNavigationItemInputSchema.parse(input)

  return db.navigationItem.create({
    data: payload,
  })
}

export async function updateNavigationItem(input: unknown) {
  const payload = updateNavigationItemInputSchema.parse(input)
  const { id, ...data } = payload

  return db.navigationItem.update({
    where: { id },
    data,
  })
}

export async function deleteNavigationItem(id: string) {
  return db.navigationItem.delete({
    where: { id },
  })
}

export async function upsertNavigationItemTranslation(input: unknown) {
  const payload = upsertNavigationItemTranslationInputSchema.parse(input)

  return db.navigationItemTranslation.upsert({
    where: {
      navigationItemId_locale: {
        navigationItemId: payload.navigationItemId,
        locale: payload.locale,
      },
    },
    create: payload,
    update: {
      label: payload.label,
    },
  })
}