package handlers

import (
	"encoding/json"
	"log"
	"net/http"
)

type healthResponse struct {
	Status string `json:"status" example:"ok"`
}

// Health is the liveness probe the ALB target group polls.
//
//	@Summary		Health check
//	@Description	Reports that the service is up and serving. Used as the ALB target group health check; it does not verify the database or S3 connections.
//	@Tags			system
//	@Produce		json
//	@Success		200	{object}	healthResponse
//	@Router			/health [get]
func Health(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, healthResponse{Status: "ok"})
}

// problemDetails is an error body in the RFC 9457 "Problem Details for HTTP
// APIs" format. Type stays "about:blank" — the value RFC 9457 defines for
// problems with no dedicated documentation URI. Title is a short summary that
// stays identical for every occurrence of the same problem, so clients can
// branch on it; Detail explains this particular occurrence and is the only
// member that varies with request data.
type problemDetails struct {
	Type   string `json:"type" example:"about:blank"`
	Title  string `json:"title" example:"Title is required."`
	Status int    `json:"status" example:"422"`
	Detail string `json:"detail,omitempty" example:"The 'title' field was absent or contained only whitespace. Every video needs a non-empty title."`
}

func writeJSON(w http.ResponseWriter, status int, body any) {
	writeJSONContent(w, "application/json", status, body)
}

func writeProblem(w http.ResponseWriter, status int, title, detail string) {
	writeJSONContent(w, "application/problem+json", status, problemDetails{
		Type:   "about:blank",
		Title:  title,
		Status: status,
		Detail: detail,
	})
}

func writeJSONContent(w http.ResponseWriter, contentType string, status int, body any) {
	w.Header().Set("Content-Type", contentType)
	w.WriteHeader(status)
	if err := json.NewEncoder(w).Encode(body); err != nil {
		log.Printf("Something Went Wrong Writing The Response: %s", err)
	}
}