// Command webapp is the PilotVault control-panel BFF. It serves the embedded
// Vue single-page app and proxies /bff/* to the API Server, so the browser only
// ever talks to this server (same-origin). The API Server is the gateway to
// PocketBase and to the live Fly App data; the browser never contacts either
// directly.
package main

import (
	"embed"
	"io/fs"
	"log"
	"net/http"
	"os"
	"strings"
	"time"
)

//go:embed all:dist
var distFS embed.FS

// App is the control-panel BFF. It talks ONLY to the API Server; the API Server
// is the gateway to PocketBase and to the live Fly App data. The browser never
// contacts PocketBase or the API Server directly.
type App struct {
	apiBase string // e.g. http://localhost:8080
}

func main() {
	log.SetFlags(log.LstdFlags | log.Lmsgprefix)
	log.SetPrefix("[web] ")

	loadDotEnv(".env")
	addr := envOr("ADDR", ":8090")
	app := &App{apiBase: strings.TrimRight(envOr("API_BASE", "http://localhost:8080"), "/")}

	mux := http.NewServeMux()
	// Auth (proxied to API Server → PocketBase)
	mux.HandleFunc("POST /bff/login", app.handleLogin)
	mux.HandleFunc("POST /bff/logout", app.handleLogout)
	mux.HandleFunc("GET /bff/me", app.handleMe)
	mux.HandleFunc("GET /bff/config", app.handleConfig)
	// Data (proxied to the API Server; gated by session cookie)
	mux.HandleFunc("GET /bff/devices", app.requireAuth(app.handleDevices))
	mux.HandleFunc("GET /bff/devices/{id}/track", app.requireAuth(app.handleTrack))
	mux.HandleFunc("POST /bff/devices/{id}/command", app.requireAuth(app.handleCommand))
	// User preferences (persisted in PocketBase via the API Server; needs the token)
	mux.HandleFunc("GET /bff/preferences", app.requireAuth(app.handleGetPrefs))
	mux.HandleFunc("PUT /bff/preferences", app.requireAuth(app.handlePutPrefs))
	// Plugin integrations (OpenSky) — per-user/per-org settings via the API Server
	mux.HandleFunc("GET /bff/integrations/opensky", app.requireAuth(app.handleGetOpenSky))
	mux.HandleFunc("PUT /bff/integrations/opensky", app.requireAuth(app.handlePutOpenSky))
	mux.HandleFunc("POST /bff/integrations/opensky/health", app.requireAuth(app.handleOpenSkyHealth))
	mux.HandleFunc("GET /bff/integrations/opensky/states", app.requireAuth(app.handleOpenSkyStates))
	// Plugin integrations (File transfer: FTP/SFTP) — per-user/per-org settings
	mux.HandleFunc("GET /bff/integrations/filetransfer", app.requireAuth(app.handleGetFileTransfer))
	mux.HandleFunc("PUT /bff/integrations/filetransfer", app.requireAuth(app.handlePutFileTransfer))
	mux.HandleFunc("POST /bff/integrations/filetransfer/health", app.requireAuth(app.handleFileTransferHealth))
	// Plugin integrations (Local storage: host filesystem) — per-user/per-org isolated folders
	mux.HandleFunc("GET /bff/integrations/localstorage", app.requireAuth(app.handleGetLocalStorage))
	mux.HandleFunc("PUT /bff/integrations/localstorage", app.requireAuth(app.handlePutLocalStorage))
	mux.HandleFunc("POST /bff/integrations/localstorage/health", app.requireAuth(app.handleLocalStorageHealth))
	// Plugin integrations (WebDAV) — per-user/per-org settings
	mux.HandleFunc("GET /bff/integrations/webdav", app.requireAuth(app.handleGetWebDav))
	mux.HandleFunc("PUT /bff/integrations/webdav", app.requireAuth(app.handlePutWebDav))
	mux.HandleFunc("POST /bff/integrations/webdav/health", app.requireAuth(app.handleWebDavHealth))
	// User-management (role + org scoping enforced by the API Server)
	mux.HandleFunc("GET /bff/users", app.requireAuth(app.handleListUsers))
	mux.HandleFunc("POST /bff/users", app.requireAuth(app.handleCreateUser))
	mux.HandleFunc("PATCH /bff/users/{id}", app.requireAuth(app.handleUpdateUser))
	mux.HandleFunc("DELETE /bff/users/{id}", app.requireAuth(app.handleDeleteUser))
	// Organizations (create/edit/delete are superadmin-only upstream)
	mux.HandleFunc("GET /bff/orgs", app.requireAuth(app.handleListOrgs))
	mux.HandleFunc("POST /bff/orgs", app.requireAuth(app.handleCreateOrg))
	mux.HandleFunc("PATCH /bff/orgs/{id}", app.requireAuth(app.handleUpdateOrg))
	mux.HandleFunc("DELETE /bff/orgs/{id}", app.requireAuth(app.handleDeleteOrg))
	// Logbook — drones, flights, and the compliance CSV export (scoping upstream)
	mux.HandleFunc("GET /bff/drones", app.requireAuth(app.handleListDrones))
	mux.HandleFunc("POST /bff/drones", app.requireAuth(app.handleCreateDrone))
	mux.HandleFunc("PATCH /bff/drones/{id}", app.requireAuth(app.handleUpdateDrone))
	mux.HandleFunc("DELETE /bff/drones/{id}", app.requireAuth(app.handleDeleteDrone))
	mux.HandleFunc("GET /bff/flights", app.requireAuth(app.handleListFlights))
	mux.HandleFunc("POST /bff/flights", app.requireAuth(app.handleCreateFlight))
	mux.HandleFunc("PATCH /bff/flights/{id}", app.requireAuth(app.handleUpdateFlight))
	mux.HandleFunc("DELETE /bff/flights/{id}", app.requireAuth(app.handleDeleteFlight))
	mux.HandleFunc("GET /bff/logbook/export", app.requireAuth(app.handleExportLogbook))
	// Documents — the compliance + operational document store (scoping upstream)
	mux.HandleFunc("GET /bff/documents", app.requireAuth(app.handleListDocuments))
	mux.HandleFunc("POST /bff/documents", app.requireAuth(app.handleCreateDocument))
	mux.HandleFunc("PATCH /bff/documents/{id}", app.requireAuth(app.handleUpdateDocument))
	mux.HandleFunc("DELETE /bff/documents/{id}", app.requireAuth(app.handleDeleteDocument))
	mux.HandleFunc("GET /bff/documents/{id}/file", app.requireAuth(app.handleDownloadDocument))
	mux.HandleFunc("GET /bff/ws", app.handleWS)
	mux.HandleFunc("GET /healthz", func(w http.ResponseWriter, r *http.Request) {
		writeJSON(w, http.StatusOK, map[string]any{"status": "ok", "api": app.apiBase})
	})

	dist, err := fs.Sub(distFS, "dist")
	if err != nil {
		log.Fatalf("embed dist: %v", err)
	}
	mux.Handle("/", noCache(http.FileServer(http.FS(dist))))

	srv := &http.Server{
		Addr:              addr,
		Handler:           logRequests(mux),
		ReadHeaderTimeout: 10 * time.Second,
	}
	log.Printf("Web App (control panel) on http://localhost%s  →  API Server %s", addr, app.apiBase)
	log.Fatal(srv.ListenAndServe())
}

func envOr(k, d string) string {
	if v := os.Getenv(k); v != "" {
		return v
	}
	return d
}

// loadDotEnv loads KEY=VALUE pairs from a .env file into the process env if they
// are not already set. It is intentionally minimal (no quoting rules beyond
// trimming surrounding quotes).
func loadDotEnv(path string) {
	data, err := os.ReadFile(path)
	if err != nil {
		return
	}
	for _, line := range strings.Split(string(data), "\n") {
		line = strings.TrimSpace(line)
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}
		key, val, ok := strings.Cut(line, "=")
		if !ok {
			continue
		}
		key = strings.TrimSpace(key)
		val = strings.Trim(strings.TrimSpace(val), `"'`)
		if _, exists := os.LookupEnv(key); !exists {
			_ = os.Setenv(key, val)
		}
	}
}

func noCache(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Cache-Control", "no-store, must-revalidate")
		next.ServeHTTP(w, r)
	})
}

func logRequests(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		next.ServeHTTP(w, r)
		log.Printf("%s %s %s", r.Method, r.URL.Path, time.Since(start).Round(time.Millisecond))
	})
}