package handlers

import (
	"net/http"
	"strconv"

	"git.eeqj.de/sneak/gohttpserver/internal/models"
	"github.com/go-chi/chi"
)

func (s *Handlers) HandleListPosts() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		posts, err := s.params.Database.ListPosts(r.Context())
		if err != nil {
			s.log.Error("failed to list posts", "error", err)
			s.respondJSON(w, r, map[string]string{"error": "internal server error"}, http.StatusInternalServerError)
			return
		}

		if posts == nil {
			posts = []*models.Post{}
		}

		s.respondJSON(w, r, posts, http.StatusOK)
	}
}

func (s *Handlers) HandleGetPost() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		idStr := chi.URLParam(r, "id")
		id, err := strconv.ParseInt(idStr, 10, 64)
		if err != nil {
			s.respondJSON(w, r, map[string]string{"error": "invalid id"}, http.StatusBadRequest)
			return
		}

		post, err := s.params.Database.GetPost(r.Context(), id)
		if err != nil {
			s.log.Error("failed to get post", "error", err, "id", id)
			s.respondJSON(w, r, map[string]string{"error": "internal server error"}, http.StatusInternalServerError)
			return
		}

		if post == nil {
			s.respondJSON(w, r, map[string]string{"error": "not found"}, http.StatusNotFound)
			return
		}

		s.respondJSON(w, r, post, http.StatusOK)
	}
}

func (s *Handlers) HandleCreatePost() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req models.CreatePostRequest
		if err := s.decodeJSON(w, r, &req); err != nil {
			s.respondJSON(w, r, map[string]string{"error": "invalid request body"}, http.StatusBadRequest)
			return
		}

		if req.Title == "" || req.Body == "" || req.Author == "" {
			s.respondJSON(w, r, map[string]string{"error": "title, body, and author are required"}, http.StatusBadRequest)
			return
		}

		post, err := s.params.Database.CreatePost(r.Context(), &req)
		if err != nil {
			s.log.Error("failed to create post", "error", err)
			s.respondJSON(w, r, map[string]string{"error": "internal server error"}, http.StatusInternalServerError)
			return
		}

		s.respondJSON(w, r, post, http.StatusCreated)
	}
}

func (s *Handlers) HandleUpdatePost() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		idStr := chi.URLParam(r, "id")
		id, err := strconv.ParseInt(idStr, 10, 64)
		if err != nil {
			s.respondJSON(w, r, map[string]string{"error": "invalid id"}, http.StatusBadRequest)
			return
		}

		var req models.UpdatePostRequest
		if err := s.decodeJSON(w, r, &req); err != nil {
			s.respondJSON(w, r, map[string]string{"error": "invalid request body"}, http.StatusBadRequest)
			return
		}

		post, err := s.params.Database.UpdatePost(r.Context(), id, &req)
		if err != nil {
			s.log.Error("failed to update post", "error", err, "id", id)
			s.respondJSON(w, r, map[string]string{"error": "internal server error"}, http.StatusInternalServerError)
			return
		}

		if post == nil {
			s.respondJSON(w, r, map[string]string{"error": "not found"}, http.StatusNotFound)
			return
		}

		s.respondJSON(w, r, post, http.StatusOK)
	}
}

func (s *Handlers) HandleDeletePost() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		idStr := chi.URLParam(r, "id")
		id, err := strconv.ParseInt(idStr, 10, 64)
		if err != nil {
			s.respondJSON(w, r, map[string]string{"error": "invalid id"}, http.StatusBadRequest)
			return
		}

		post, err := s.params.Database.GetPost(r.Context(), id)
		if err != nil {
			s.log.Error("failed to get post for delete", "error", err, "id", id)
			s.respondJSON(w, r, map[string]string{"error": "internal server error"}, http.StatusInternalServerError)
			return
		}

		if post == nil {
			s.respondJSON(w, r, map[string]string{"error": "not found"}, http.StatusNotFound)
			return
		}

		if err := s.params.Database.DeletePost(r.Context(), id); err != nil {
			s.log.Error("failed to delete post", "error", err, "id", id)
			s.respondJSON(w, r, map[string]string{"error": "internal server error"}, http.StatusInternalServerError)
			return
		}

		s.respondJSON(w, r, nil, http.StatusNoContent)
	}
}