// Package handlers
package handlers

import (
	"encoding/json"
	"errors"
	"fmt"
	"log/slog"
	"net/http"
	"strconv"
	"strings"

	"github.com/go-chi/chi/v5"
	"gogs.fxtmmsk.ru/foxtime/photoplaces/backend/internal/middleware"
	"gogs.fxtmmsk.ru/foxtime/photoplaces/backend/internal/models"
	"gogs.fxtmmsk.ru/foxtime/photoplaces/backend/internal/services"
	"gogs.fxtmmsk.ru/foxtime/photoplaces/backend/internal/validator"
)

type PlaceHandler struct {
	placeSvc PlaceService
	authSvc  AuthService
}

func NewPlaceHandler(placeSvc PlaceService, authSvc AuthService) *PlaceHandler {
	return &PlaceHandler{placeSvc: placeSvc, authSvc: authSvc}
}

func (h *PlaceHandler) List(w http.ResponseWriter, r *http.Request) {
	q := r.URL.Query()

	status := q.Get("status")
	if status == "" {
		status = "published"
	}
	if status != "published" {
		role := middleware.GetUserRole(r.Context())
		if role == "" {
			if parts := strings.SplitN(r.Header.Get("Authorization"), " ", 2); len(parts) == 2 && parts[0] == "Bearer" {
				if claims, err := h.authSvc.ValidateAccessToken(parts[1]); err == nil {
					role = claims.Role
				}
			}
		}
		if role != "moderator" && role != "superadmin" {
			writeError(w, http.StatusForbidden, "access denied", nil)
			return
		}
	}

	filter := models.PlaceFilter{
		Type:   q.Get("type"),
		Status: status,
	}

	if tags := q["tags"]; len(tags) > 0 {
		filter.TagIDs = tags
	}
	if features := q["features"]; len(features) > 0 {
		filter.FeatureIDs = features
	}
	if mr := q.Get("min_rating"); mr != "" {
		if v, err := strconv.ParseFloat(mr, 64); err == nil {
			filter.MinRating = v
		}
	}
	if pmin := q.Get("price_min"); pmin != "" {
		if v, err := strconv.Atoi(pmin); err == nil {
			filter.PriceMin = &v
		}
	}
	if pmax := q.Get("price_max"); pmax != "" {
		if v, err := strconv.Atoi(pmax); err == nil {
			filter.PriceMax = &v
		}
	}
	if bounds := q.Get("bounds"); bounds != "" {
		var b models.Bounds
		if _, err := fmt.Sscanf(bounds, "%f,%f,%f,%f", &b.SWLat, &b.SWLng, &b.NELat, &b.NELng); err == nil {
			filter.Bounds = &b
		} else {
			slog.Warn("invalid bounds format", "bounds", bounds, "error", err)
		}
	}
	if limit := q.Get("limit"); limit != "" {
		if v, err := strconv.Atoi(limit); err == nil {
			filter.Limit_ = v
		}
	}
	filter.Sort = q.Get("sort")
	if q.Get("user_lat") != "" && q.Get("user_lng") != "" {
		if lat, err := strconv.ParseFloat(q.Get("user_lat"), 64); err == nil {
			filter.UserLat = &lat
		}
		if lng, err := strconv.ParseFloat(q.Get("user_lng"), 64); err == nil {
			filter.UserLng = &lng
		}
	}

	// Include tags and features if requested (e.g., ?include=tags,features)
	if include := q.Get("include"); include != "" {
		for _, v := range strings.Split(include, ",") {
			if v == "tags" || v == "features" {
				filter.IncludeTagsFeatures = true
				break
			}
		}
	}

	if cursor := q.Get("cursor"); cursor != "" {
		id, createdAt, rating, err := services.DecodeCursor(cursor)
		if err != nil {
			writeError(w, http.StatusBadRequest, "invalid cursor", err)
			return
		}
		filter.Cursor = id
		filter.CursorCreatedAt = &createdAt
		if q.Get("sort") == "rating" {
			filter.CursorRating = &rating
		}
	}

	result, err := h.placeSvc.List(r.Context(), filter)
	if err != nil {
		writeError(w, http.StatusInternalServerError, "failed to list places", err)
		return
	}

	if result.Data == nil {
		result.Data = []*models.Place{}
	}

	writeJSON(w, http.StatusOK, result)
}

func (h *PlaceHandler) GetByID(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")

	place, err := h.placeSvc.GetByID(r.Context(), id, true)
	if err != nil {
		writeError(w, http.StatusInternalServerError, "failed to get place", err)
		return
	}
	if place == nil {
		writeError(w, http.StatusNotFound, "place not found", nil)
		return
	}

	writeJSON(w, http.StatusOK, place)
}

func (h *PlaceHandler) ListMy(w http.ResponseWriter, r *http.Request) {
	userID := middleware.GetUserID(r.Context())

	places, err := h.placeSvc.List(r.Context(), models.PlaceFilter{
		OwnerID:             userID,
		IncludeTagsFeatures: true,
	})
	if err != nil {
		writeError(w, http.StatusInternalServerError, "failed to list places", err)
		return
	}

	if places.Data == nil {
		places.Data = []*models.Place{}
	}

	writeJSON(w, http.StatusOK, places)
}

type createPlaceRequest struct {
	Title       string   `json:"title" validate:"required,min=1,max=255"`
	Description *string  `json:"description" validate:"omitempty,max=5000"`
	Address     *string  `json:"address" validate:"omitempty,max=500"`
	Lat         float64  `json:"lat" validate:"required,latitude"`
	Lng         float64  `json:"lng" validate:"required,longitude"`
	Type        string   `json:"type" validate:"required,place_type"`
	AccessInfo  *string  `json:"access_info" validate:"omitempty,max=2000"`
	CoverImage  *string  `json:"cover_image" validate:"omitempty,url,max=500"`
	Tags        []string `json:"tags" validate:"dive,slug,max=50"`
	Features    []string `json:"features" validate:"dive,slug,max=50"`
	HourlyRate  *int     `json:"hourly_rate" validate:"omitempty,min=0"`
	Currency    string   `json:"currency" validate:"omitempty,currency,len=3"`
	MinHours    int      `json:"min_hours" validate:"min=0,max=100"`
	Status      string   `json:"status" validate:"omitempty,place_status"`
}

type updatePlaceRequest struct {
	Title       *string  `json:"title" validate:"omitempty,min=1,max=255"`
	Description *string  `json:"description" validate:"omitempty,max=5000"`
	Address     *string  `json:"address" validate:"omitempty,max=500"`
	Lat         *float64 `json:"lat" validate:"omitempty,latitude"`
	Lng         *float64 `json:"lng" validate:"omitempty,longitude"`
	AccessInfo  *string  `json:"access_info" validate:"omitempty,max=2000"`
	CoverImage  *string  `json:"cover_image" validate:"omitempty,url,max=500"`
	Tags        []string `json:"tags" validate:"dive,slug,max=50"`
	Features    []string `json:"features" validate:"dive,slug,max=50"`
	HourlyRate  *int     `json:"hourly_rate" validate:"omitempty,min=0"`
	Currency    *string  `json:"currency" validate:"omitempty,currency,len=3"`
	MinHours    *int     `json:"min_hours" validate:"omitempty,min=0,max=100"`
}

type moderatePlaceRequest struct {
	Action  string  `json:"action" validate:"required,oneof=approve reject rework revoke"`
	Comment *string `json:"comment" validate:"omitempty,max=1000"`
}

func (h *PlaceHandler) Create(w http.ResponseWriter, r *http.Request) {
	userID := middleware.GetUserID(r.Context())
	role := middleware.GetUserRole(r.Context())

	r.Body = http.MaxBytesReader(w, r.Body, maxRequestBodySize)
	var req createPlaceRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body", err)
		return
	}

	if err := validator.Validate(req); err != nil {
		writeValidationError(w, err)
		return
	}

	if req.Type == "studio" && role != "landlord" && role != "moderator" && role != "superadmin" {
		writeError(w, http.StatusForbidden, "only landlords can create studios", nil)
		return
	}
	if req.Type == "place" && role != "customer" && role != "moderator" && role != "superadmin" {
		writeError(w, http.StatusForbidden, "only customers can create places", nil)
		return
	}

	tags := make([]models.Tag, len(req.Tags))
	for i, t := range req.Tags {
		tags[i] = models.Tag{ID: t}
	}
	features := make([]models.Feature, len(req.Features))
	for i, f := range req.Features {
		features[i] = models.Feature{ID: f}
	}

	place, err := h.placeSvc.Create(r.Context(), services.CreatePlaceInput{
		OwnerID:     userID,
		Type:        req.Type,
		Title:       req.Title,
		Description: req.Description,
		Address:     req.Address,
		Lat:         req.Lat,
		Lng:         req.Lng,
		CoverImage:  req.CoverImage,
		AccessInfo:  req.AccessInfo,
		Tags:        tags,
		Features:    features,
		HourlyRate:  req.HourlyRate,
		Currency:    req.Currency,
		MinHours:    req.MinHours,
		Status:      req.Status,
	})
	if err != nil {
		writeError(w, http.StatusInternalServerError, "failed to create place", err)
		return
	}

	writeJSON(w, http.StatusCreated, place)
}

func (h *PlaceHandler) Update(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	userID := middleware.GetUserID(r.Context())
	role := middleware.GetUserRole(r.Context())

	r.Body = http.MaxBytesReader(w, r.Body, maxRequestBodySize)
	var req updatePlaceRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body", err)
		return
	}

	if err := validator.Validate(req); err != nil {
		writeValidationError(w, err)
		return
	}

	isModerator := role == "moderator" || role == "superadmin"

	input := services.UpdatePlaceInput{
		ID:      id,
		OwnerID: userID,
	}

	if req.Title != nil { input.Title = req.Title }
	input.Description = req.Description
	input.Address = req.Address
	input.Lat = req.Lat
	input.Lng = req.Lng
	if req.CoverImage != nil { input.CoverImage = req.CoverImage }
	input.AccessInfo = req.AccessInfo
	input.HourlyRate = req.HourlyRate
	input.Currency = req.Currency
	input.MinHours = req.MinHours

	if req.Tags != nil {
		tags := make([]models.Tag, len(req.Tags))
		for i, t := range req.Tags {
			tags[i] = models.Tag{ID: t}
		}
		input.Tags = tags
	}
	if req.Features != nil {
		features := make([]models.Feature, len(req.Features))
		for i, f := range req.Features {
			features[i] = models.Feature{ID: f}
		}
		input.Features = features
	}

	place, err := h.placeSvc.Update(r.Context(), input, isModerator)
	if err != nil {
		if errors.Is(err, services.ErrNotYourPlace) {
			writeError(w, http.StatusForbidden, "not your place", nil)
			return
		}
		writeError(w, http.StatusInternalServerError, "failed to update place", err)
		return
	}
	if place == nil {
		writeError(w, http.StatusNotFound, "place not found", nil)
		return
	}

	writeJSON(w, http.StatusOK, place)
}

func (h *PlaceHandler) Moderate(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	userID := middleware.GetUserID(r.Context())

	r.Body = http.MaxBytesReader(w, r.Body, maxRequestBodySize)
	var req moderatePlaceRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body", err)
		return
	}

	if err := validator.Validate(req); err != nil {
		writeValidationError(w, err)
		return
	}

	comment := ""
	if req.Comment != nil {
		comment = *req.Comment
	}
	if err := h.placeSvc.Moderate(r.Context(), id, req.Action, comment, userID); err != nil {
		writeError(w, http.StatusInternalServerError, "failed to moderate place", err)
		return
	}

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

func (h *PlaceHandler) Delete(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	userID := middleware.GetUserID(r.Context())
	role := middleware.GetUserRole(r.Context())

	place, err := h.placeSvc.GetByID(r.Context(), id, false)
	if err != nil {
		writeError(w, http.StatusInternalServerError, "failed to get place", err)
		return
	}
	if place == nil {
		writeError(w, http.StatusNotFound, "place not found", nil)
		return
	}
	if place.OwnerID != userID && role != "moderator" && role != "superadmin" {
		writeError(w, http.StatusForbidden, "not your place", nil)
		return
	}

	if err := h.placeSvc.Delete(r.Context(), id, userID); err != nil {
		writeError(w, http.StatusInternalServerError, "failed to delete place", err)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

func (h *PlaceHandler) HardDelete(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	userID := middleware.GetUserID(r.Context())

	if err := h.placeSvc.HardDelete(r.Context(), id, userID); err != nil {
		writeError(w, http.StatusInternalServerError, "failed to hard-delete place", err)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

func (h *PlaceHandler) Restore(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	userID := middleware.GetUserID(r.Context())

	if err := h.placeSvc.Restore(r.Context(), id, userID); err != nil {
		writeError(w, http.StatusInternalServerError, "failed to restore place", err)
		return
	}

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