package handlers

import (
	"encoding/json"
	"io"
	"net/http"
	"net/url"
	"strings"
	"time"

	"github.com/go-chi/chi/v5"
)

// LandvexRealHandler hanterar riktig integration mot Landvex API
type LandvexRealHandler struct {
	baseURL string
	client  *http.Client
}

// NewLandvexRealHandler skapar en ny handler
func NewLandvexRealHandler() *LandvexRealHandler {
	return &LandvexRealHandler{
		baseURL: getEnv("LANDVEX_API_URL", "http://172.17.0.1:8081"),
		client:  &http.Client{Timeout: 10 * time.Second},
	}
}

// LandvexObject representerar ett Landvex-objekt
type LandvexObject struct {
	LvxID       string                 `json:"lvx_id"`
	Slug        string                 `json:"slug"`
	Namn        map[string]string      `json:"namn"`
	Beskrivning map[string]string      `json:"beskrivning"`
	Kategorier  []string               `json:"kategorier"`
	Standarder  []string               `json:"standarder"`
	Metadata    map[string]interface{} `json:"metadata"`
}

// LandvexSearchResult representerar sökresultat
type LandvexSearchResult struct {
	LvxID      string            `json:"lvx_id"`
	Namn       map[string]string `json:"namn"`
	Relevans   float64           `json:"relevans"`
	Kategorier []string          `json:"kategorier"`
}

// fetchFromLandvex hämtar data från Landvex API
func (h *LandvexRealHandler) fetchFromLandvex(endpoint string) (map[string]interface{}, error) {
	resp, err := h.client.Get(h.baseURL + endpoint)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	var result map[string]interface{}
	if err := json.Unmarshal(body, &result); err != nil {
		return nil, err
	}
	return result, nil
}

// GetHealth hämtar health från Landvex
func (h *LandvexRealHandler) GetHealth(w http.ResponseWriter, r *http.Request) {
	health, err := h.fetchFromLandvex("/health")
	if err != nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":     true,
		"landvex": health,
	})
}

// GetObjects hämtar alla objekt
func (h *LandvexRealHandler) GetObjects(w http.ResponseWriter, r *http.Request) {
	// Sök efter alla objekt (tom sökning)
	results, err := h.fetchFromLandvex("/v0/search?q=")
	if err != nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":      true,
		"results": results,
	})
}

// GetObject hämtar ett specifikt objekt
func (h *LandvexRealHandler) GetObject(w http.ResponseWriter, r *http.Request) {
	lvxID := chi.URLParam(r, "id")

	obj, err := h.fetchFromLandvex("/v0/objects/" + lvxID)
	if err != nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":     true,
		"object": obj,
	})
}

// Search söker i Landvex
func (h *LandvexRealHandler) Search(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query().Get("q")
	if query == "" {
		writeJSON(w, http.StatusBadRequest, map[string]interface{}{
			"ok":    false,
			"error": "missing query parameter 'q'",
		})
		return
	}

	resp, err := h.client.Get(h.baseURL + "/v0/search?q=" + url.QueryEscape(query))
	if err != nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	// Landvex returnerar inte JSON med ok/error, utan direkt resultat
	var result map[string]interface{}
	if err := json.Unmarshal(body, &result); err != nil {
		writeJSON(w, http.StatusOK, map[string]interface{}{
			"ok":      true,
			"query":   query,
			"raw":     string(body),
			"parse_error": err.Error(),
		})
		return
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":      true,
		"query":   query,
		"results": result,
	})
}

// Identify identifierar ett objekt från bild/text
func (h *LandvexRealHandler) Identify(w http.ResponseWriter, r *http.Request) {
	var req struct {
		ImageURL    string `json:"image_url,omitempty"`
		Description string `json:"description,omitempty"`
	}

	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	// Vidarebefordra till Landvex identify
	landvexReq := map[string]interface{}{
		"image_url":    req.ImageURL,
		"description":  req.Description,
	}

	reqBody, _ := json.Marshal(landvexReq)
	resp, err := h.client.Post(h.baseURL+"/v0/identify", "application/json", strings.NewReader(string(reqBody)))
	if err != nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	var result map[string]interface{}
	if err := json.Unmarshal(body, &result); err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":     true,
		"result": result,
	})
}