// Package handler implements inbound HTTP contracts.
package handler

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

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

// RouterOptions contains optional handlers wired by the application layer.
type RouterOptions struct {
	Chat          http.Handler
	ChatPage      http.Handler
	DashScopeChat http.Handler
	MCP           http.Handler
}

// NewRouter returns the HTTP handler for the application.
func NewRouter(options ...RouterOptions) http.Handler {
	mux := http.NewServeMux()
	mux.HandleFunc("GET /health", health)
	if len(options) > 0 {
		if options[0].Chat != nil {
			mux.Handle("/api/chat", options[0].Chat)
		}
		if options[0].ChatPage != nil {
			mux.Handle("GET /chat", http.RedirectHandler("/chat/", http.StatusPermanentRedirect))
			mux.Handle("GET /chat/", options[0].ChatPage)
		}
		if options[0].DashScopeChat != nil {
			mux.Handle("/api/v1/apps/{app_id}/completion", options[0].DashScopeChat)
		}
		if options[0].MCP != nil {
			mux.Handle("/mcp", options[0].MCP)
		}
	}

	return mux
}

func health(w http.ResponseWriter, _ *http.Request) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	_ = json.NewEncoder(w).Encode(healthResponse{Status: "ok"})
}