package stacks

import (
	"database/sql"
	"net/http"
	"os"
	"screenmark/screenmark/.gen/haystack/haystack/model"
	"screenmark/screenmark/limits"
	"screenmark/screenmark/middleware"
	"screenmark/screenmark/models"

	"github.com/charmbracelet/log"
	"github.com/go-chi/chi/v5"
	"github.com/google/uuid"
)

type StackHandler struct {
	logger *log.Logger

	imageModel models.ImageModel
	stackModel models.StackModel

	limitsManager limits.LimitsManagerMethods

	jwtManager *middleware.JwtManager
}

func (h *StackHandler) getAllStacks(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	userID, err := middleware.GetUserID(ctx, h.logger, w)
	if err != nil {
		return
	}

	stacks, err := h.stackModel.List(ctx, userID)
	if err != nil {
		h.logger.Warn("could not get stacks", "err", err)
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	middleware.WriteJsonOrError(h.logger, stacks, w)
}

func (h *StackHandler) getStackItems(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	_, err := middleware.GetUserID(ctx, h.logger, w)
	if err != nil {
		return
	}

	stackID, err := middleware.GetPathParamID(h.logger, "listID", w, r)
	if err != nil {
		return
	}

	// TODO: must check for permission here.

	lists, err := h.stackModel.ListItems(ctx, stackID)
	if err != nil {
		h.logger.Warn("could not get list items", "err", err)
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	middleware.WriteJsonOrError(h.logger, lists, w)
}

type EditStack struct {
	Hello string `json:"hello"`
}

func (h *StackHandler) editStack(req EditStack, w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(http.StatusNotImplemented)
}

func (h *StackHandler) deleteStack(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	userID, err := middleware.GetUserID(ctx, h.logger, w)
	if err != nil {
		return
	}

	stackID, err := middleware.GetPathParamID(h.logger, "listID", w, r)
	if err != nil {
		return
	}

	err = h.stackModel.Delete(ctx, stackID, userID)
	if err != nil {
		h.logger.Warn("could not delete stack", "err", err)
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	w.WriteHeader(http.StatusOK)
}

func (h *StackHandler) deleteImageFromStack(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	stringListID := chi.URLParam(r, "stackID")
	stringImageID := chi.URLParam(r, "imageID")

	imageID, err := uuid.Parse(stringImageID)
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	stackID, err := uuid.Parse(stringListID)
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	// TODO: this should be extracted into a middleware of sorts
	userID, err := middleware.GetUserID(ctx, h.logger, w)
	if err != nil {
		w.WriteHeader(http.StatusUnauthorized)
		return
	}

	stack, err := h.stackModel.Get(ctx, stackID)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	if stack.UserID != userID {
		w.WriteHeader(http.StatusUnauthorized)
		return
	}

	err = h.stackModel.DeleteImage(ctx, stackID, imageID)
	if err != nil {
		h.logger.Warn("failed to delete image from list", "error", err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
}

func (h *StackHandler) deleteImageStackSchemaItem(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	stringStackID := chi.URLParam(r, "stackID")
	stringSchemaItemID := chi.URLParam(r, "schemaItemID")

	stackID, err := uuid.Parse(stringStackID)
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	schemaItemID, err := uuid.Parse(stringSchemaItemID)
	if err != nil {
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	// TODO: this should be extracted into a middleware of sorts
	userID, err := middleware.GetUserID(ctx, h.logger, w)
	if err != nil {
		w.WriteHeader(http.StatusUnauthorized)
		return
	}

	stack, err := h.stackModel.Get(ctx, stackID)
	if err != nil {
		h.logger.Error("could not get stack model", "err", err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	if stack.UserID != userID {
		w.WriteHeader(http.StatusUnauthorized)
		return
	}

	// TODO:
	// The code above is repeated, because it contains stack & image
	// manipulations. So we could create a middleware.
	// If you repeat this 3 times, then organise it :)

	err = h.stackModel.DeleteSchemaItem(ctx, stackID, schemaItemID)
	if err != nil {
		h.logger.Warn("failed to delete image from list", "error", err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusOK)
}

type CreateStackBody struct {
	Title       string `json:"title"`
	Description string `json:"description"`
}

func (h *StackHandler) createStack(body CreateStackBody, w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	userID, err := middleware.GetUserID(ctx, h.logger, w)
	if err != nil {
		return
	}

	// TODO: Add the stack processor here
	stack, err := h.stackModel.Save(ctx, userID, body.Title, body.Description, model.Progress_NotStarted)
	if err != nil {
		h.logger.Warn("could not save stack", "err", err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	middleware.WriteJsonOrError(h.logger, stack, w)
}

func (h *StackHandler) CreateRoutes(r chi.Router) {
	h.logger.Info("Mounting stack router")

	r.Group(func(r chi.Router) {
		r.Use(middleware.ProtectedRoute(h.jwtManager))
		r.Use(middleware.SetJson)

		r.Get("/", h.getAllStacks)
		r.Get("/{stackID}", h.getStackItems)

		r.Post("/", middleware.WithLimit(h.logger, h.limitsManager.HasReachedStackLimit, middleware.WithValidatedPost(h.createStack)))
		r.Patch("/{stackID}", middleware.WithValidatedPost(h.editStack))
		r.Delete("/{stackID}", h.deleteStack)
		r.Delete("/{stackID}/{imageID}", h.deleteImageFromStack)
		r.Delete("/{stackID}/{schemaItemID}", h.deleteImageStackSchemaItem)
	})
}

func CreateStackHandler(db *sql.DB, limitsManager limits.LimitsManagerMethods, jwtManager *middleware.JwtManager) StackHandler {
	stackModel := models.NewStackModel(db)
	imageModel := models.NewImageModel(db)
	logger := log.New(os.Stdout).WithPrefix("Stacks")

	return StackHandler{
		logger:        logger,
		imageModel:    imageModel,
		stackModel:    stackModel,
		limitsManager: limitsManager,
		jwtManager:    jwtManager,
	}
}