package controller

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

	"github.com/AFASystems/presence/internal/pkg/api/response"
	"github.com/AFASystems/presence/internal/pkg/service"
	"github.com/AFASystems/presence/internal/pkg/validation"
	"github.com/gorilla/mux"
	"gorm.io/gorm"
)

func AlertsListController(db *gorm.DB, ctx context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		query := r.URL.Query()

		lStr := query.Get("limit")
		if lStr == "" {
			lStr = "100"
		}
		limit, err := strconv.Atoi(lStr)
		if err != nil {
			slog.Error("invalid limit parameter", "value", lStr)
			response.BadRequest(w, "invalid limit parameter")
			return
		}

		oStr := query.Get("offset")
		if oStr == "" {
			oStr = "0"
		}
		offset, err := strconv.Atoi(oStr)
		if err != nil {
			slog.Error("invalid offset parameter", "value", oStr)
			response.BadRequest(w, "invalid offset parameter")
			return
		}

		alerts, err := service.GetAllAlerts(db, ctx, limit, offset)
		if err != nil {
			response.InternalError(w, "failed to list alerts", err)
			return
		}
		response.JSON(w, http.StatusOK, alerts)
	}
}

func ListAlertsByTrackerIDController(db *gorm.DB, ctx context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]
		alert, err := service.GetAlertById(id, db, ctx)
		if err != nil {
			if errors.Is(err, gorm.ErrRecordNotFound) {
				response.NotFound(w, "alert not found")
				return
			}
			response.InternalError(w, "failed to get alert", err)
			return
		}
		response.JSON(w, http.StatusOK, alert)
	}
}

func AlertDeleteController(db *gorm.DB, ctx context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]
		if err := service.DeleteAlertByTrackerID(id, db, ctx); err != nil {
			response.InternalError(w, "failed to delete alert", err)
			return
		}
		response.JSON(w, http.StatusOK, map[string]string{"status": "deleted"})
	}
}

// AlertUpdateStatusController updates an alert's status by id. Body: {"status": "resolved"} (or other status string).
func AlertUpdateStatusController(db *gorm.DB, ctx context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]
		var body struct {
			Status string `json:"status"`
		}
		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
			response.BadRequest(w, "invalid request body")
			return
		}
		if err := validation.Var(body.Status, "required"); err != nil {
			response.BadRequest(w, err.Error())
			return
		}
		if err := service.UpdateAlertStatus(id, body.Status, db, ctx); err != nil {
			if errors.Is(err, gorm.ErrRecordNotFound) {
				response.NotFound(w, "alert not found")
				return
			}
			response.InternalError(w, "failed to update alert status", err)
			return
		}
		response.JSON(w, http.StatusOK, map[string]string{"status": "updated"})
	}
}