package main

import (
	"database/sql"
	"encoding/json"
	"net/http"
	"strconv"

	"github.com/gorilla/mux"
)

func (a *App) getTag(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid tag ID")
		return
	}

	c := Tag{ID: id}
	if err := c.getTag(a.DB); err != nil {
		switch err {
		case sql.ErrNoRows:
			respondWithError(w, http.StatusNotFound, "Tag not found")
		default:
			respondWithError(w, http.StatusInternalServerError, err.Error())
		}
		return
	}

	respondWithJSON(w, http.StatusOK, c)
}

func (a *App) getTags(w http.ResponseWriter, r *http.Request) {
	count, _ := strconv.Atoi(r.FormValue("count"))
	start, _ := strconv.Atoi(r.FormValue("start"))

	if count > 10 || count < 1 {
		count = 10
	}
	if start < 0 {
		start = 0
	}

	tags, err := getTags(a.DB, start, count)
	if err != nil {
		respondWithError(w, http.StatusInternalServerError, err.Error())
		return
	}

	respondWithJSON(w, http.StatusOK, tags)
}

func (a *App) createTag(w http.ResponseWriter, r *http.Request) {
	var c Tag
	decoder := json.NewDecoder(r.Body)
	if err := decoder.Decode(&c); err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid request payload")
		return
	}
	defer r.Body.Close()
	if err := c.createTag(a.DB); err != nil {
		respondWithError(w, http.StatusInternalServerError, err.Error())
		return
	}

	respondWithJSON(w, http.StatusCreated, c)
}

func (a *App) updateTag(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid tag ID")
		return
	}

	var c Tag
	decoder := json.NewDecoder(r.Body)
	if err := decoder.Decode(&c); err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid request payload")
		return
	}
	defer r.Body.Close()
	c.ID = id

	if err := c.updateTag(a.DB); err != nil {
		respondWithError(w, http.StatusInternalServerError, err.Error())
		return
	}

	respondWithJSON(w, http.StatusOK, c)
}

func (a *App) deleteTag(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		respondWithError(w, http.StatusBadRequest, "Invalid Tag ID")
		return
	}

	c := Tag{ID: id}
	if err := c.deleteTag(a.DB); err != nil {
		respondWithError(w, http.StatusInternalServerError, err.Error())
		return
	}

	respondWithJSON(w, http.StatusOK, map[string]string{"result": "success"})
}