package web

import (
	"context"
	"fmt"
	"fuj-management/go/internal/config"
	"fuj-management/go/internal/services/membership"
	"fuj-management/go/internal/web/api"
	"fuj-management/go/internal/web/middleware"
	"io"
	"io/fs"
	"log/slog"
	"net/http"
)

// BuildInfo carries the linker-injected build metadata.
type BuildInfo struct {
	Version   string
	Commit    string
	BuildDate string
}

// ActionHandlers holds function closures for side-effectful operations that
// require dependencies (fio, sheets) not present on the core API handler.
type ActionHandlers struct {
	// BankSync runs sync+infer and writes a human-readable log to out.
	// nil disables the /sync-bank action (renders an error instead).
	BankSync func(ctx context.Context, out io.Writer) error
}

// Run registers routes and starts the HTTP server on addr.
func Run(logger *slog.Logger, addr string, build BuildInfo, sources membership.Sources, cfg config.Config, actions ActionHandlers) error {
	renderer, err := NewRenderer()
	if err != nil {
		return fmt.Errorf("init templates: %w", err)
	}

	ah := &api.Handler{
		BuildVersion: build.Version,
		BuildCommit:  build.Commit,
		BuildDate:    build.BuildDate,
		Sources:      sources,
		Config:       cfg,
		Logger:       logger,
	}
	hh := NewHTMLHandler(renderer, build, ah, actions)

	staticSubFS, err := fs.Sub(staticFS, "static")
	if err != nil {
		return fmt.Errorf("static subfs: %w", err)
	}

	mux := http.NewServeMux()

	// HTML routes
	mux.HandleFunc("GET /{$}", func(w http.ResponseWriter, r *http.Request) {
		http.Redirect(w, r, "/adults", http.StatusFound)
	})
	mux.HandleFunc("GET /adults", hh.ServeAdults)
	mux.HandleFunc("GET /juniors", hh.ServeJuniors)
	mux.HandleFunc("GET /payments", hh.ServePayments)
	mux.HandleFunc("GET /sync-bank", hh.ServeSync)
	mux.HandleFunc("GET /flush-cache", hh.ServeFlushCacheGET)
	mux.HandleFunc("POST /flush-cache", hh.ServeFlushCachePOST)
	mux.HandleFunc("GET /qr", hh.ServeQR)

	// Static files
	mux.Handle("/static/", http.StripPrefix("/static/", http.FileServerFS(staticSubFS)))

	// JSON API routes
	mux.HandleFunc("GET /api/version", ah.ServeVersion)
	mux.HandleFunc("GET /version", ah.ServeVersion)
	mux.HandleFunc("GET /api/adults", ah.ServeAdults)
	mux.HandleFunc("GET /api/juniors", ah.ServeJuniors)
	mux.HandleFunc("GET /api/payments", ah.ServePayments)

	logger.Info("starting server", "addr", addr)
	return http.ListenAndServe(addr, middleware.RequestTimer(logger, mux))
}