package handlers

import (
	"encoding/json"
	"net/http"
	"strconv"

	"github.com/rede5/gohorsejobs/backend/internal/dto"
	"github.com/rede5/gohorsejobs/backend/internal/services"
)

type ApplicationHandler struct {
	Service *services.ApplicationService
}

func NewApplicationHandler(service *services.ApplicationService) *ApplicationHandler {
	return &ApplicationHandler{Service: service}
}

func (h *ApplicationHandler) CreateApplication(w http.ResponseWriter, r *http.Request) {
	var req dto.CreateApplicationRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	app, err := h.Service.CreateApplication(req)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(app)
}

func (h *ApplicationHandler) GetApplications(w http.ResponseWriter, r *http.Request) {
	// For now, simple get by Job ID query param
	jobIDStr := r.URL.Query().Get("jobId")
	if jobIDStr == "" {
		http.Error(w, "jobId is required", http.StatusBadRequest)
		return
	}
	jobID, err := strconv.Atoi(jobIDStr)
	if err != nil {
		http.Error(w, "Invalid jobId", http.StatusBadRequest)
		return
	}

	apps, err := h.Service.GetApplications(jobID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(apps)
}

func (h *ApplicationHandler) GetApplicationByID(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	id, err := strconv.Atoi(idStr)
	if err != nil {
		http.Error(w, "Invalid application ID", http.StatusBadRequest)
		return
	}

	app, err := h.Service.GetApplicationByID(id)
	if err != nil {
		http.Error(w, err.Error(), http.StatusNotFound)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(app)
}

func (h *ApplicationHandler) UpdateApplicationStatus(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	id, err := strconv.Atoi(idStr)
	if err != nil {
		http.Error(w, "Invalid application ID", http.StatusBadRequest)
		return
	}

	var req dto.UpdateApplicationStatusRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	app, err := h.Service.UpdateApplicationStatus(id, req)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(app)
}