import "dotenv/config";
import express from "express";
import cors from "cors";

export function createServer() {
  const app = express();

  // Middleware
  app.use(cors());
  app.use(express.json());
  app.use(express.urlencoded({ extended: true }));

  // Example API routes
  app.get("/api/ping", (_req, res) => {
    const ping = process.env.PING_MESSAGE ?? "ping";
    res.json({ message: ping });
  });

  // Admin-backed API (service role)
  try {
    const { adminSupabase } = await import("./supabase");

    app.get("/api/health", async (_req, res) => {
      try {
        const { error } = await adminSupabase.from("user_profiles").select("count", { count: "exact", head: true });
        if (error) return res.status(500).json({ ok: false, error: error.message });
        return res.json({ ok: true });
      } catch (e: any) {
        return res.status(500).json({ ok: false, error: e?.message || String(e) });
      }
    });

    app.get("/api/posts", async (req, res) => {
      const limit = Math.max(1, Math.min(50, Number(req.query.limit) || 10));
      try {
        const { data, error } = await adminSupabase
          .from("community_posts")
          .select(`*, user_profiles ( username, full_name, avatar_url )`)
          .eq("is_published", true)
          .order("created_at", { ascending: false })
          .limit(limit);
        if (error) return res.status(500).json({ error: error.message });
        res.json(data || []);
      } catch (e: any) {
        res.status(500).json({ error: e?.message || String(e) });
      }
    });

    app.get("/api/user/:id/posts", async (req, res) => {
      const userId = req.params.id;
      try {
        const { data, error } = await adminSupabase
          .from("community_posts")
          .select("*")
          .eq("author_id", userId)
          .order("created_at", { ascending: false });
        if (error) return res.status(500).json({ error: error.message });
        res.json(data || []);
      } catch (e: any) {
        res.status(500).json({ error: e?.message || String(e) });
      }
    });

    app.post("/api/posts", async (req, res) => {
      const payload = req.body || {};
      try {
        const { data, error } = await adminSupabase
          .from("community_posts")
          .insert({
            author_id: payload.author_id,
            title: payload.title,
            content: payload.content,
            category: payload.category,
            tags: payload.tags,
            is_published: payload.is_published ?? true,
          })
          .select()
          .single();
        if (error) return res.status(500).json({ error: error.message });
        res.json(data);
      } catch (e: any) {
        res.status(500).json({ error: e?.message || String(e) });
      }
    });

    app.post("/api/profile/ensure", async (req, res) => {
      const { id, profile } = req.body || {};
      if (!id) return res.status(400).json({ error: "missing id" });
      try {
        const { data, error } = await adminSupabase
          .from("user_profiles")
          .upsert({ id, ...profile }, { onConflict: "id" })
          .select()
          .single();
        if (error) return res.status(500).json({ error: error.message });
        res.json(data);
      } catch (e: any) {
        res.status(500).json({ error: e?.message || String(e) });
      }
    });

    app.post("/api/interests", async (req, res) => {
      const { user_id, interests } = req.body || {};
      if (!user_id || !Array.isArray(interests)) return res.status(400).json({ error: "invalid payload" });
      try {
        await adminSupabase.from("user_interests").delete().eq("user_id", user_id);
        if (interests.length) {
          const rows = interests.map((interest: string) => ({ user_id, interest }));
          const { error } = await adminSupabase.from("user_interests").insert(rows);
          if (error) return res.status(500).json({ error: error.message });
        }
        res.json({ ok: true });
      } catch (e: any) {
        res.status(500).json({ error: e?.message || String(e) });
      }
    });

    app.get("/api/applications", async (req, res) => {
      const owner = String(req.query.owner || "");
      if (!owner) return res.status(400).json({ error: "owner required" });
      try {
        const { data, error } = await adminSupabase
          .from("project_applications")
          .select(`*, projects!inner(id, title, user_id)`)
          .eq("projects.user_id", owner)
          .order("created_at", { ascending: false })
          .limit(50);
        if (error) return res.status(500).json({ error: error.message });
        res.json(data || []);
      } catch (e: any) {
        res.status(500).json({ error: e?.message || String(e) });
      }
    });
  } catch (e) {
    console.warn("Admin API not initialized:", e);
  }

  return app;
}