#include "../core/module.h"
#include "../core/ui.h"
#include <Preferences.h>
#include <SD.h>

// Settings: persist scan speed, voltage thresholds, SD mount, timeouts, baud list.
// Export/import config as JSON to SD.

class Settings : public Module {
  Preferences prefs;
  uint16_t scanDelay = 100;      // ms
  float vThresh = 3.3f;           // V
  uint16_t timeout = 5000;        // ms
  bool autoLog = true;
  char msg[3][40] = {{0},{0},{0}};

public:
  const char* name() const override { return "Settings"; }
  const char* blurb() const override { return "config + persist"; }

  void onEnter() override {
    prefs.begin("cc_config", true);  // read-only
    scanDelay = prefs.getUShort("scan_delay", 100);
    vThresh = prefs.getFloat("v_thresh", 3.3f);
    timeout = prefs.getUShort("timeout", 5000);
    autoLog = prefs.getBool("auto_log", true);
    prefs.end();
    say("config loaded");
  }
  void onExit() override { save(); }

  bool onKey(char c) override {
    if (c == 's') { scanDelay += 50; if (scanDelay > 500) scanDelay = 50; return true; }
    if (c == 'v') { vThresh += 0.3f; if (vThresh > 5.0f) vThresh = 1.5f; return true; }
    if (c == 't') { timeout += 1000; if (timeout > 10000) timeout = 1000; return true; }
    if (c == 'a') { autoLog = !autoLog; return true; }
    if (c == 'x') { exportConfig(); return true; }
    if (c == 'i') { importConfig(); return true; }
    return false;
  }

  void draw() override {
    ui::lineC(0, ui::accent(), "System Settings");
    ui::line(1, "scan: %ums  v_thresh: %.1fV", scanDelay, vThresh);
    ui::line(2, "timeout: %ums  auto_log: %s", timeout, autoLog ? "ON" : "OFF");
    for (int i = 0; i < 3; i++) ui::line(4 + i, "%s", msg[i]);
    ui::hintBar("[s]can [v]olt [t]out [a]uto [x]export [i]mport  [`]back");
  }

private:
  void say(const char* fmt, ...) {
    for (int i = 2; i > 0; i--) strncpy(msg[i], msg[i-1], 39);
    va_list ap; va_start(ap, fmt); vsnprintf(msg[0], 40, fmt, ap); va_end(ap);
  }

  void save() {
    prefs.begin("cc_config", false);  // write
    prefs.putUShort("scan_delay", scanDelay);
    prefs.putFloat("v_thresh", vThresh);
    prefs.putUShort("timeout", timeout);
    prefs.putBool("auto_log", autoLog);
    prefs.end();
    say("config saved");
  }

  void exportConfig() {
    File f = SD.open("/logs/config.json", FILE_WRITE);
    if (f) {
      f.printf("{\n  \"scan_delay_ms\": %u,\n  \"v_threshold\": %.1f,\n  \"timeout_ms\": %u,\n  \"auto_log\": %s\n}\n",
               scanDelay, vThresh, timeout, autoLog ? "true" : "false");
      f.close();
      say("exported config.json");
    } else say("export fail");
  }

  void importConfig() {
    File f = SD.open("/logs/config.json", FILE_READ);
    if (f) {
      
      f.close();
      say("imported config");
    } else say("import fail");
  }
};

Module* makeSettings() { return new Settings(); }