"use server";

import { prisma } from "@/lib/prisma";
import { revalidatePath } from "next/cache";
import { verifyPassword, signToken, verifyToken } from "@/lib/auth";
import { cookies } from "next/headers";

// ── PROJECTS ACTIONS ──

export async function getProjects() {
  try {
    return await prisma.project.findMany({
      orderBy: { num: "asc" },
    });
  } catch (error) {
    console.error("Error fetching projects:", error);
    return [];
  }
}

export async function saveProject(data: any) {
  try {
    const { id, num, slug, title, tag, desc, spec, year, client, duration, tech, challenge, solution, results, image, gallery, website } = data;

    let project;
    if (id) {
      // Update
      project = await prisma.project.update({
        where: { id: Number(id) },
        data: {
          num,
          slug,
          title,
          tag,
          desc,
          spec,
          year,
          client,
          duration,
          tech,
          challenge,
          solution,
          results,
          image: image || "",
          gallery: gallery || [],
          website: website || "",
        },
      });
    } else {
      // Create
      // Ensure slug is unique
      const existing = await prisma.project.findFirst({ where: { slug } });
      if (existing) {
        throw new Error("A project with this slug already exists.");
      }

      project = await prisma.project.create({
        data: {
          num,
          slug,
          title,
          tag,
          desc,
          spec,
          year,
          client,
          duration,
          tech,
          challenge,
          solution,
          results,
          image: image || "",
          gallery: gallery || [],
          website: website || "",
        },
      });
    }
    
    revalidatePath("/[lang]/work", "layout");
    revalidatePath("/[lang]/admin", "page");
    return { success: true, project };
  } catch (error: any) {
    console.error("Error saving project:", error);
    return { success: false, error: error.message };
  }
}

export async function deleteProject(id: number) {
  try {
    await prisma.project.delete({
      where: { id },
    });
    revalidatePath("/[lang]/work", "layout");
    revalidatePath("/[lang]/admin", "page");
    return { success: true };
  } catch (error: any) {
    console.error("Error deleting project:", error);
    return { success: false, error: error.message };
  }
}

// ── BLOG POSTS ACTIONS ──

export async function getBlogPosts() {
  try {
    const posts = await prisma.blogPost.findMany({
      orderBy: { date: "desc" },
    });
    return posts;
  } catch (error) {
    console.error("Error fetching blog posts:", error);
    return [];
  }
}

export async function saveBlogPost(data: any) {
  try {
    const {
      id,
      slug,
      date,
      author,
      authorRole,
      image,
      trTitle,
      trExcerpt,
      trReadingTime,
      trCategory,
      trTags,
      trContent,
      enTitle,
      enExcerpt,
      enReadingTime,
      enCategory,
      enTags,
      enContent,
    } = data;

    let post;
    if (id) {
      // Update
      post = await prisma.blogPost.update({
        where: { id: Number(id) },
        data: {
          slug,
          date,
          author,
          authorRole,
          image,
          trTitle,
          trExcerpt,
          trReadingTime,
          trCategory,
          trTags,
          trContent,
          enTitle,
          enExcerpt,
          enReadingTime,
          enCategory,
          enTags,
          enContent,
        },
      });
    } else {
      // Create
      const existing = await prisma.blogPost.findFirst({ where: { slug } });
      if (existing) {
        throw new Error("A blog post with this slug already exists.");
      }

      post = await prisma.blogPost.create({
        data: {
          slug,
          date,
          author,
          authorRole,
          image,
          trTitle,
          trExcerpt,
          trReadingTime,
          trCategory,
          trTags,
          trContent,
          enTitle,
          enExcerpt,
          enReadingTime,
          enCategory,
          enTags,
          enContent,
        },
      });
    }

    revalidatePath("/[lang]/blog", "layout");
    revalidatePath("/[lang]/admin", "page");
    return { success: true, post };
  } catch (error: any) {
    console.error("Error saving blog post:", error);
    return { success: false, error: error.message };
  }
}

export async function deleteBlogPost(id: number) {
  try {
    await prisma.blogPost.delete({
      where: { id },
    });
    revalidatePath("/[lang]/blog", "layout");
    revalidatePath("/[lang]/admin", "page");
    return { success: true };
  } catch (error: any) {
    console.error("Error deleting blog post:", error);
    return { success: false, error: error.message };
  }
}

// ── PARTNERS ACTIONS ──

export async function getPartners() {
  try {
    return await prisma.partner.findMany({
      orderBy: { id: "asc" },
    });
  } catch (error) {
    console.error("Error fetching partners:", error);
    return [];
  }
}

export async function savePartner(data: any) {
  try {
    const { id, name, tag, mono, year, desc } = data;
    
    let partner;
    if (id) {
      // Update
      partner = await prisma.partner.update({
        where: { id: Number(id) },
        data: {
          name,
          tag,
          mono,
          year,
          desc,
        },
      });
    } else {
      // Create
      // Ensure name is unique
      const existing = await prisma.partner.findFirst({ where: { name } });
      if (existing) {
        throw new Error("Bu isimde bir partner zaten mevcut.");
      }
      
      partner = await prisma.partner.create({
        data: {
          name,
          tag,
          mono,
          year,
          desc,
        },
      });
    }
    
    revalidatePath("/[lang]/partners", "layout");
    revalidatePath("/[lang]/admin", "page");
    return { success: true, partner };
  } catch (error: any) {
    console.error("Error saving partner:", error);
    return { success: false, error: error.message };
  }
}

export async function deletePartner(id: number) {
  try {
    await prisma.partner.delete({
      where: { id },
    });
    revalidatePath("/[lang]/partners", "layout");
    revalidatePath("/[lang]/admin", "page");
    return { success: true };
  } catch (error: any) {
    console.error("Error deleting partner:", error);
    return { success: false, error: error.message };
  }
}

// ── AUTHENTICATION ACTIONS ──

const COOKIE_NAME = "ayris_session";

export async function getAdminSession() {
  try {
    const cookieStore = await cookies();
    const token = cookieStore.get(COOKIE_NAME)?.value;
    if (!token) return null;
    return verifyToken(token);
  } catch (error: any) {
    if (error?.digest === 'DYNAMIC_SERVER_USAGE' || error?.message?.includes('Dynamic server usage')) {
      throw error;
    }
    console.error("Error reading admin session:", error);
    return null;
  }
}

export async function adminLoginAction(data: any) {
  try {
    const { username, password } = data;
    if (!username || !password) {
      return { success: false, error: "Kullanıcı adı ve şifre zorunludur!" };
    }

    const user = await prisma.user.findUnique({
      where: { username },
    });

    if (!user) {
      return { success: false, error: "Geçersiz kullanıcı adı veya şifre!" };
    }

    const isValid = verifyPassword(password, user.password);
    if (!isValid) {
      return { success: false, error: "Geçersiz kullanıcı adı veya şifre!" };
    }

    const token = signToken({ userId: user.id, username: user.username });
    
    const cookieStore = await cookies();
    cookieStore.set(COOKIE_NAME, token, {
      httpOnly: true,
      secure: process.env.NODE_ENV === "production",
      sameSite: "strict",
      maxAge: 24 * 60 * 60, // 24 hours
      path: "/",
    });

    return { success: true };
  } catch (error: any) {
    console.error("Login action error:", error);
    return { success: false, error: "Giriş yapılırken beklenmedik bir hata oluştu!" };
  }
}

export async function adminLogoutAction() {
  try {
    const cookieStore = await cookies();
    cookieStore.delete(COOKIE_NAME);
    return { success: true };
  } catch (error: any) {
    console.error("Logout action error:", error);
    return { success: false, error: "Çıkış yapılırken bir hata oluştu!" };
  }
}