package controller

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"

	"github.com/fjurmanovic/sugarr/internal/service"
	"github.com/fjurmanovic/sugarr/internal/utl/configs"
	"github.com/fjurmanovic/sugarr/internal/utl/httputil"
)

type RequestController struct {
	cfg *configs.Config
	rec *service.Recommender
}

func NewRequestController(mux *http.ServeMux, cfg *configs.Config, rec *service.Recommender) *RequestController {
	c := &RequestController{cfg: cfg, rec: rec}
	mux.HandleFunc("POST /recommendations/request", c.handle)
	return c
}

// handle adds a movie to Radarr by TMDb ID.
// Body: {"tmdb_id": 12345}
func (c *RequestController) handle(w http.ResponseWriter, r *http.Request) {
	if !c.cfg.RadarrEnabled || c.rec.Radarr() == nil {
		httputil.WriteError(w, http.StatusBadRequest, "Radarr is not enabled")
		return
	}

	var body struct {
		TMDbID int `json:"tmdb_id"`
	}
	if err := decodeJSON(r, &body); err != nil || body.TMDbID == 0 {
		httputil.WriteError(w, http.StatusBadRequest, "body must be {\"tmdb_id\": 12345}")
		return
	}

	movie, err := c.rec.Radarr().Lookup(body.TMDbID)
	if err != nil {
		httputil.WriteError(w, http.StatusInternalServerError, fmt.Sprintf("radarr lookup failed: %s", err))
		return
	}
	if err := c.rec.Radarr().AddMovie(*movie); err != nil {
		httputil.WriteError(w, http.StatusInternalServerError, fmt.Sprintf("radarr add failed: %s", err))
		return
	}
	httputil.WriteJSON(w, http.StatusOK, map[string]any{"requested": true, "title": movie.Title})
}

func decodeJSON(r *http.Request, v any) error {
	body, err := io.ReadAll(io.LimitReader(r.Body, 1<<20))
	if err != nil {
		return err
	}
	return json.Unmarshal(body, v)
}