package main

import (
	_ "embed"
	"encoding/json"
	"image"
	"log/slog"
	"net/http"
	"sync"
	"time"

	"spoolweight/claude"
)

//go:embed index.html
var indexHTML []byte

// serve runs the mobile putaway web server. Requests are serialized because the
// shared spooldb browser session is single-threaded.
func serve(addr string, auth claude.Auth, sp *spoolSync, dryRun bool) error {
	var mu sync.Mutex

	mux := http.NewServeMux()

	mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/" {
			http.NotFound(w, r)
			return
		}
		w.Header().Set("Content-Type", "text/html; charset=utf-8")
		w.Write(indexHTML)
	})

	mux.HandleFunc("POST /process", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")

		if err := r.ParseMultipartForm(64 << 20); err != nil {
			writeJSON(w, result{Error: "upload too large or malformed"})
			return
		}
		file, hdr, err := r.FormFile("photo")
		if err != nil {
			writeJSON(w, result{Error: "no photo in request"})
			return
		}
		defer file.Close()

		img, _, err := image.Decode(file)
		if err != nil {
			writeJSON(w, result{Image: hdr.Filename, Error: "could not read image (try choosing from your library)"})
			return
		}

		start := time.Now()
		mu.Lock()
		res := processImg(img, hdr.Filename, auth, sp, dryRun)
		mu.Unlock()
		slog.Info("processed upload", "file", hdr.Filename, "spool", res.SpoolID, "dur", time.Since(start))

		writeJSON(w, res)
	})

	slog.Info("putaway server listening", "addr", addr, "dry_run", dryRun)
	return http.ListenAndServe(addr, mux)
}

func writeJSON(w http.ResponseWriter, v any) {
	json.NewEncoder(w).Encode(v)
}