#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ST7789.h>
#include <Adafruit_NeoPixel.h>
#include <Preferences.h>
#include <WebServer.h>
#include <DNSServer.h>

// ── Cấu hình chân TFT (ESP32-S3-N16R8) ───────────
// SCL = SCLK, SDA = MOSI (theo cách gọi của user)
#define TFT_CS    16
#define TFT_DC    15
#define TFT_RST    7
#define TFT_MOSI   6   // SDA
#define TFT_SCLK   5   // SCL

// Màn hình nằm NGANG 320x240
#define SCREEN_WIDTH  320
#define SCREEN_HEIGHT 240
#define TFT_ROTATION  3   // đổi thành 3 nếu hình bị lộn ngược

#define COLOR_BG     ST77XX_BLACK
#define COLOR_TEXT   ST77XX_WHITE
#define COLOR_CYAN   ST77XX_CYAN
#define COLOR_GREEN  ST77XX_GREEN
#define COLOR_YELLOW ST77XX_YELLOW
#define COLOR_ORANGE 0xFD20
#define COLOR_RED    ST77XX_RED
#define COLOR_HEADER 0x1082

#define AP_SSID  "ESP32-S3-Setup"
#define DNS_PORT 53

// ── LED onboard (RGB) ──────────────────────────
#define LED_PIN 48
#define NUMPIXELS 1

// Khởi tạo đối tượng NeoPixel
Adafruit_NeoPixel pixels(NUMPIXELS, LED_PIN, NEO_GRB + NEO_KHZ800);

Adafruit_ST7789 tft = Adafruit_ST7789(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);
Preferences     prefs;
WebServer       server(80);
DNSServer       dnsServer;

// ── Cấu hình ─────────────────────────────────────
char g_ssid[64]     = "Tenda_FF1220";
char g_password[64] = "1234567890";
char g_api_url[160] = "http://192.168.1.3:8320/api/summary?range=today";

// ── Dữ liệu ──────────────────────────────────────
struct AccountStat { char name[40]; int requests; long total_tokens; int failed; };
struct ModelStat   { char name[24]; int requests; long total_tokens; int failed; };
struct HourStat    { char hour[20]; int requests; long total_tokens; };

long g_requests        = 0;
long g_total_tokens    = 0;
long g_input_tokens    = 0;
long g_output_tokens   = 0;
long g_reasoning_tokens= 0;
long g_cached_tokens   = 0;
long g_failed          = 0;

AccountStat g_accounts[8];
int         g_accountCount = 0;
ModelStat   g_models[6];
int         g_modelCount   = 0;
HourStat    g_hours[8];
int         g_hourCount    = 0;

// ── State flags ───────────────────────────────────
volatile bool g_dataReady   = false;
volatile bool g_apMode      = false;
int           g_page        = 0;
#define TOTAL_PAGES 4

SemaphoreHandle_t g_tftMutex;

// ═════════════════════════════════════════════════
//  Preferences
// ═════════════════════════════════════════════════
void loadPrefs() {
    prefs.begin("cfg", true);
    prefs.getString("ssid",    g_ssid,    sizeof(g_ssid));
    prefs.getString("pass",    g_password,sizeof(g_password));
    prefs.getString("api_url", g_api_url, sizeof(g_api_url));
    prefs.end();
    Serial.printf("[PREFS] ssid=%s api=%s\n", g_ssid, g_api_url);
}

void savePrefs() {
    prefs.begin("cfg", false);
    prefs.putString("ssid",    g_ssid);
    prefs.putString("pass",    g_password);
    prefs.putString("api_url", g_api_url);
    prefs.end();
    Serial.println("[PREFS] saved");
}

// ═════════════════════════════════════════════════
//  TFT helpers — tất cả dùng mutex
// ═════════════════════════════════════════════════
void tftLock()   { xSemaphoreTake(g_tftMutex, portMAX_DELAY); }
void tftUnlock() { xSemaphoreGive(g_tftMutex); }


void drawHeader(const char* subtitle, int page, int total) {
    tft.fillRect(0, 0, SCREEN_WIDTH, 40, COLOR_HEADER);
    tft.setTextColor(COLOR_CYAN);
    tft.setTextSize(2);
    tft.setCursor(8, 4);
    tft.print("CLIProxyAPI");
    tft.setTextColor(COLOR_ORANGE);
    tft.setTextSize(1);
    tft.setCursor(8, 24);
    tft.print("Dashboard");

    tft.setTextColor(COLOR_YELLOW);
    tft.setCursor(190, 8);
    tft.print(subtitle);

    if (total > 0) {
        char buf[8];
        snprintf(buf, sizeof(buf), "%d/%d", page+1, total);
        tft.setTextColor(COLOR_GREEN);
        tft.setCursor(SCREEN_WIDTH - (int)strlen(buf)*6 - 6, 24);
        tft.print(buf);
    }
    tft.drawFastHLine(0, 40, SCREEN_WIDTH, COLOR_ORANGE);
}

void tft_showAPMode() {
    tftLock();
    tft.fillScreen(COLOR_BG);
    drawHeader("SETUP MODE", 0, 0);
    tft.setTextColor(COLOR_YELLOW); tft.setTextSize(1);
    tft.setCursor(8,50);  tft.println("Ket noi WiFi:");
    tft.setTextColor(COLOR_GREEN);  tft.setTextSize(2);
    tft.setCursor(8,64);  tft.println(AP_SSID);
    tft.setTextColor(COLOR_TEXT);   tft.setTextSize(1);
    tft.setCursor(8,88);  tft.println("(Khong can mat khau)");
    tft.drawFastHLine(0, 102, SCREEN_WIDTH, COLOR_HEADER);
    tft.setTextColor(COLOR_CYAN);
    tft.setCursor(8,112); tft.println("Mo trinh duyet:");
    tft.setTextColor(COLOR_ORANGE); tft.setTextSize(2);
    tft.setCursor(8,128); tft.println("192.168.4.1");
    tft.setTextColor(COLOR_TEXT);   tft.setTextSize(1);
    tft.setCursor(8,154); tft.println("de cau hinh WiFi & API");
    tftUnlock();
}

void tft_showConnecting(const char* ssid) {
    tftLock();
    tft.fillScreen(COLOR_BG);
    drawHeader("CONNECTING...", 0, 0);
    tft.setTextColor(COLOR_YELLOW); tft.setTextSize(1);
    tft.setCursor(8,50); tft.print("SSID: "); tft.println(ssid);
    tft.setTextColor(COLOR_TEXT);
    tft.setCursor(8,66); tft.println("Vui long cho...");
    tftUnlock();
}

void tft_showConnected() {
    tftLock();
    tft.fillScreen(COLOR_BG);
    tft.fillRect(0, 0, SCREEN_WIDTH, 50, ST77XX_GREEN);
    tft.setTextColor(ST77XX_WHITE); tft.setTextSize(2);
    tft.setCursor(15,8);  tft.println("Network");
    tft.setCursor(15,28); tft.println("Connected!");
    tft.drawFastHLine(0, 52, SCREEN_WIDTH, COLOR_GREEN);
    tft.setTextSize(1);
    tft.setTextColor(COLOR_CYAN);   tft.setCursor(8,66);
    tft.print("IP  : "); tft.setTextColor(COLOR_GREEN);
    tft.println(WiFi.localIP().toString());
    tft.setTextColor(COLOR_CYAN);   tft.setCursor(8,82);
    tft.print("Cfg : http://");
    tft.setTextColor(COLOR_ORANGE);
    tft.println(WiFi.localIP().toString());
    tft.setTextColor(COLOR_YELLOW); tft.setCursor(8,100);
    tft.println("Dang lay du lieu...");
    tftUnlock();
}

void tft_showWiFiFailed() {
    tftLock();
    tft.fillScreen(COLOR_BG);
    tft.fillRect(0, 0, SCREEN_WIDTH, 50, ST77XX_RED);
    tft.setTextColor(ST77XX_WHITE); tft.setTextSize(2);
    tft.setCursor(10,8);  tft.println("WiFi");
    tft.setCursor(10,28); tft.println("FAILED!");
    tft.setTextSize(1); tft.setTextColor(COLOR_YELLOW);
    tft.setCursor(8,64); tft.println("Ket noi WiFi: " AP_SSID);
    tft.setCursor(8,80); tft.println("Truy cap 192.168.4.1");
    tft.setCursor(8,96); tft.println("de cau hinh lai");
    tftUnlock();
}

void tft_showFetchError() {
    tftLock();
    tft.fillRect(0, SCREEN_HEIGHT-16, SCREEN_WIDTH, 16, COLOR_BG);
    tft.setTextSize(1); tft.setTextColor(COLOR_RED);
    tft.setCursor(6, SCREEN_HEIGHT-12);
    tft.print("Fetch loi! Kiem tra API URL");
    tftUnlock();
}

// ── Vẽ 4 trang dữ liệu ───────────────────────────
void drawPage0() {
    // Tổng quan
    tft.fillScreen(COLOR_BG);
    drawHeader("Total", 0, TOTAL_PAGES);
    char buf[40];

    // Cột trái: Requests lớn
    tft.setTextSize(1); tft.setTextColor(COLOR_CYAN);
    tft.setCursor(8,48); tft.print("Requests");
    tft.setTextSize(4); tft.setTextColor(COLOR_GREEN);
    snprintf(buf,sizeof(buf),"%ld",g_requests);
    tft.setCursor(8,62); tft.print(buf);

    tft.setTextSize(1); tft.setTextColor(COLOR_CYAN);
    tft.setCursor(8,108); tft.print("Failed");
    tft.setTextSize(2); tft.setTextColor(g_failed > 0 ? COLOR_RED : COLOR_TEXT);
    snprintf(buf,sizeof(buf),"%ld",g_failed);
    tft.setCursor(8,120); tft.print(buf);

    // Cột phải: token breakdown
    int x = 165, y = 48;
    tft.drawFastVLine(x-12, 46, SCREEN_HEIGHT-46-10, COLOR_HEADER);

    tft.setTextSize(1); tft.setTextColor(COLOR_YELLOW);
    tft.setCursor(x,y); tft.print("Total Tokens:"); y+=14;
    tft.setTextSize(2); tft.setTextColor(COLOR_ORANGE);
    snprintf(buf,sizeof(buf),"%ld",g_total_tokens);
    tft.setCursor(x,y); tft.print(buf); y+=24;

    tft.setTextSize(1);
    tft.setTextColor(COLOR_CYAN);  tft.setCursor(x,y); tft.print("Input    : ");
    tft.setTextColor(COLOR_TEXT);  snprintf(buf,sizeof(buf),"%ld",g_input_tokens); tft.println(buf); y+=14;
    tft.setTextColor(COLOR_CYAN);  tft.setCursor(x,y); tft.print("Output   : ");
    tft.setTextColor(COLOR_TEXT);  snprintf(buf,sizeof(buf),"%ld",g_output_tokens); tft.println(buf); y+=14;
    tft.setTextColor(COLOR_CYAN);  tft.setCursor(x,y); tft.print("Reasoning: ");
    tft.setTextColor(COLOR_TEXT);  snprintf(buf,sizeof(buf),"%ld",g_reasoning_tokens); tft.println(buf); y+=14;
    tft.setTextColor(COLOR_CYAN);  tft.setCursor(x,y); tft.print("Cached   : ");
    tft.setTextColor(COLOR_TEXT);  snprintf(buf,sizeof(buf),"%ld",g_cached_tokens); tft.println(buf);
}

void drawPage1() {
    // Accounts
    tft.fillScreen(COLOR_BG);
    drawHeader("Account", 1, TOTAL_PAGES);
    int y=48; char buf[48];
    for (int i=0; i<g_accountCount && i<5; i++) {
        char sn[36]; strncpy(sn,g_accounts[i].name,35); sn[35]='\0';
        tft.setTextSize(1); tft.setTextColor(COLOR_YELLOW);
        tft.setCursor(6,y); tft.print(sn);
        tft.setTextColor(COLOR_TEXT); tft.setCursor(6,y+12);
        snprintf(buf,sizeof(buf),"  %d reqs   %ld tokens   fail:%d",
                 g_accounts[i].requests, g_accounts[i].total_tokens, g_accounts[i].failed);
        tft.print(buf);
        tft.drawFastHLine(0,y+26,SCREEN_WIDTH,COLOR_HEADER);
        y+=30;
    }
    if (g_accountCount == 0) {
        tft.setTextColor(COLOR_TEXT); tft.setCursor(6,y); tft.print("(khong co du lieu)");
    }
}

void drawPage2() {
    // Models
    tft.fillScreen(COLOR_BG);
    drawHeader("Model", 2, TOTAL_PAGES);
    int y=48; char buf[48];
    for (int i=0; i<g_modelCount && i<6; i++) {
        tft.setTextSize(1); tft.setTextColor(COLOR_GREEN);
        tft.setCursor(6,y); tft.print(g_models[i].name);
        tft.setTextColor(COLOR_TEXT); tft.setCursor(6,y+12);
        snprintf(buf,sizeof(buf),"  %d reqs   %ld tokens   fail:%d",
                 g_models[i].requests, g_models[i].total_tokens, g_models[i].failed);
        tft.print(buf);
        tft.drawFastHLine(0,y+26,SCREEN_WIDTH,COLOR_HEADER);
        y+=30;
    }
    if (g_modelCount == 0) {
        tft.setTextColor(COLOR_TEXT); tft.setCursor(6,y); tft.print("(khong co du lieu)");
    }
}

void drawPage3() {
    // Hours (hoạt động theo giờ gần nhất)
    tft.fillScreen(COLOR_BG);
    drawHeader("Hourly", 3, TOTAL_PAGES);
    int y=48; char buf[48];
    int start = g_hourCount > 6 ? g_hourCount - 6 : 0; // 6 giờ gần nhất
    for (int i=start; i<g_hourCount; i++) {
        tft.setTextSize(1); tft.setTextColor(COLOR_CYAN);
        tft.setCursor(6,y); tft.print(g_hours[i].hour);
        tft.setTextColor(COLOR_TEXT);
        snprintf(buf,sizeof(buf),"  %d reqs  %ld tok", g_hours[i].requests, g_hours[i].total_tokens);
        tft.setCursor(6,y+12); tft.print(buf);
        tft.drawFastHLine(0,y+26,SCREEN_WIDTH,COLOR_HEADER);
        y+=30;
        if (y > SCREEN_HEIGHT - 28) break;
    }
    if (g_hourCount == 0) {
        tft.setTextColor(COLOR_TEXT); tft.setCursor(6,y); tft.print("(khong co du lieu)");
    }
}

void drawCurrentPage() {
    tftLock();
    switch (g_page) {
        case 0: drawPage0(); break;
        case 1: drawPage1(); break;
        case 2: drawPage2(); break;
        case 3: drawPage3(); break;
    }
    tftUnlock();
}

// ═════════════════════════════════════════════════
//  Fetch API
// ═════════════════════════════════════════════════
bool fetchAndParseData() {
    Serial.printf("[FETCH] GET %s\n", g_api_url);
    HTTPClient http;
    http.begin(g_api_url);
    http.setTimeout(10000);
    int code = http.GET();
    Serial.printf("[FETCH] HTTP code: %d\n", code);
    if (code != 200) { http.end(); return false; }

    String payload = http.getString();
    http.end();

    Serial.printf("[FETCH] Payload size: %d bytes\n", payload.length());

    // Buffer 24KB đủ cho summary + accounts + models + hours
    DynamicJsonDocument doc(24576);
    DeserializationError err = deserializeJson(doc, payload);

    if (err) {
        Serial.printf("[FETCH] JSON error: %s\n", err.c_str());
        Serial.printf("[FETCH] Payload preview: %s\n", payload.substring(0, 200).c_str());
        return false;
    }

    JsonObject summary = doc["summary"];
    g_requests         = summary["requests"]         | 0L;
    g_total_tokens      = summary["total_tokens"]     | 0L;
    g_input_tokens       = summary["input_tokens"]     | 0L;
    g_output_tokens      = summary["output_tokens"]    | 0L;
    g_reasoning_tokens   = summary["reasoning_tokens"] | 0L;
    g_cached_tokens      = summary["cached_tokens"]    | 0L;
    g_failed             = summary["failed"]           | 0L;

    // Parse accounts[]
    g_accountCount = 0;
    if (doc.containsKey("accounts")) {
        for (JsonObject acc : doc["accounts"].as<JsonArray>()) {
            if (g_accountCount >= 8) break;
            const char* name = acc["account"] | "?";
            strncpy(g_accounts[g_accountCount].name, name, 39);
            g_accounts[g_accountCount].name[39] = '\0';
            g_accounts[g_accountCount].requests     = acc["requests"]      | 0;
            g_accounts[g_accountCount].total_tokens = acc["total_tokens"]  | 0L;
            g_accounts[g_accountCount].failed       = acc["failed"]        | 0;
            g_accountCount++;
        }
    }

    // Parse models[]
    g_modelCount = 0;
    if (doc.containsKey("models")) {
        for (JsonObject m : doc["models"].as<JsonArray>()) {
            if (g_modelCount >= 6) break;
            const char* name = m["model"] | "?";
            strncpy(g_models[g_modelCount].name, name, 23);
            g_models[g_modelCount].name[23] = '\0';
            g_models[g_modelCount].requests     = m["requests"]     | 0;
            g_models[g_modelCount].total_tokens = m["total_tokens"] | 0L;
            g_models[g_modelCount].failed       = m["failed"]       | 0;
            g_modelCount++;
        }
    }

    // Parse hours[]
    g_hourCount = 0;
    if (doc.containsKey("hours")) {
        for (JsonObject h : doc["hours"].as<JsonArray>()) {
            if (g_hourCount >= 8) break;
            const char* hr = h["hour"] | "?";
            // Chỉ lấy phần giờ "HH:00" để gọn (bỏ ngày)
            const char* sp = strchr(hr, ' ');
            const char* shown = sp ? sp+1 : hr;
            strncpy(g_hours[g_hourCount].hour, shown, 19);
            g_hours[g_hourCount].hour[19] = '\0';
            g_hours[g_hourCount].requests     = h["requests"]     | 0;
            g_hours[g_hourCount].total_tokens = h["total_tokens"] | 0L;
            g_hourCount++;
        }
    }

    Serial.printf("[FETCH] OK — reqs=%ld tokens=%ld accounts=%d models=%d hours=%d\n",
                  g_requests, g_total_tokens, g_accountCount, g_modelCount, g_hourCount);
    return true;
}

// ═════════════════════════════════════════════════
//  HTML
// ═════════════════════════════════════════════════
const char HTML_SETUP[] PROGMEM = R"rawliteral(
<!DOCTYPE html><html><head>
<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
<title>ESP32 Setup</title>
<style>
body{font-family:sans-serif;background:#111;color:#eee;max-width:420px;margin:auto;padding:16px}
h2{color:#0cf} input,select{width:100%;padding:10px;margin:8px 0;background:#222;color:#eee;border:1px solid #444;border-radius:6px;box-sizing:border-box;font-size:15px}
button{width:100%;padding:12px;background:#0a0;color:#fff;border:none;border-radius:6px;font-size:16px;cursor:pointer;margin-top:8px}
button.scan{background:#005f8f} .msg{padding:10px;border-radius:6px;margin-top:12px}
.ok{background:#0a0} .err{background:#900} label{color:#aaa;font-size:13px}
</style></head><body>
<h2>&#9881; ESP32-S3 Setup</h2>
<button class="scan" onclick="scanWifi()">&#128246; Quet WiFi</button><br><br>
<label>Chon mang WiFi</label>
<select id="ssid_sel" onchange="document.getElementById('ssid').value=this.value">
  <option value="">-- Quet truoc --</option></select>
<label>Hoac nhap thu cong</label>
<input id="ssid" type="text" placeholder="Ten WiFi">
<label>Mat khau</label>
<input id="pass" type="password" placeholder="Mat khau WiFi">
<label>API URL</label>
<input id="api" type="text" value="%API_URL%">
<button onclick="save()">&#128190; Luu va Ket noi</button>
<div id="msg"></div>
<script>
function scanWifi(){
  document.getElementById('msg').innerHTML='<div class="msg">Dang quet...</div>';
  fetch('/scan').then(r=>r.json()).then(nets=>{
    let sel=document.getElementById('ssid_sel');
    sel.innerHTML='<option value="">-- Chon mang --</option>';
    nets.forEach(n=>{let o=document.createElement('option');o.value=n.ssid;
      o.text=n.ssid+' ('+n.rssi+'dBm'+(n.open?', Open':'')+')';sel.appendChild(o);});
    document.getElementById('msg').innerHTML='';
  }).catch(()=>{document.getElementById('msg').innerHTML='<div class="msg err">Loi quet</div>';});
}
function save(){
  let ssid=document.getElementById('ssid').value||document.getElementById('ssid_sel').value;
  let pass=document.getElementById('pass').value;
  let api=document.getElementById('api').value;
  if(!ssid){document.getElementById('msg').innerHTML='<div class="msg err">Nhap SSID</div>';return;}
  document.getElementById('msg').innerHTML='<div class="msg">Dang luu va khoi dong lai...</div>';
  fetch('/save',{method:'POST',headers:{'Content-Type':'application/x-www-form-urlencoded'},
    body:'ssid='+encodeURIComponent(ssid)+'&pass='+encodeURIComponent(pass)+'&api='+encodeURIComponent(api)})
  .then(r=>r.text()).then(t=>{document.getElementById('msg').innerHTML='<div class="msg ok">'+t+'</div>';})
  .catch(()=>{document.getElementById('msg').innerHTML='<div class="msg err">Loi</div>';});
}
</script></body></html>)rawliteral";

const char HTML_CONFIG[] PROGMEM = R"rawliteral(
<!DOCTYPE html><html><head>
<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
<title>ESP32 Config</title>
<style>
body{font-family:sans-serif;background:#111;color:#eee;max-width:420px;margin:auto;padding:16px}
h2{color:#0cf} h3{color:#fa0;margin-top:20px}
input{width:100%;padding:10px;margin:8px 0;background:#222;color:#eee;border:1px solid #444;border-radius:6px;box-sizing:border-box;font-size:15px}
button{width:100%;padding:12px;background:#0a0;color:#fff;border:none;border-radius:6px;font-size:16px;cursor:pointer;margin-top:8px}
button.danger{background:#900} .msg{padding:10px;border-radius:6px;margin-top:12px}
.ok{background:#0a0} .err{background:#900}
.info{background:#005f8f;padding:10px;border-radius:6px;margin-bottom:12px;font-size:13px}
label{color:#aaa;font-size:13px}
</style></head><body>
<h2>&#9881; ESP32-S3 Config</h2>
<div class="info">IP: %LOCAL_IP% &nbsp;|&nbsp; SSID: %CURRENT_SSID%</div>
<h3>Doi API URL</h3>
<label>API URL hien tai</label>
<input id="api" type="text" value="%API_URL%">
<button onclick="saveApi()">&#128190; Cap nhat API URL</button>
<h3>Doi WiFi</h3>
<label>SSID moi</label><input id="ssid" type="text" placeholder="Ten WiFi moi">
<label>Mat khau moi</label><input id="pass" type="password" placeholder="Mat khau">
<button onclick="saveWifi()">&#128246; Doi WiFi va Khoi dong lai</button>
<h3>Reset</h3>
<button class="danger" onclick="if(confirm('Reset?'))reset()">&#128683; Reset ve AP Mode</button>
<div id="msg"></div>
<script>
function saveApi(){
  fetch('/update',{method:'POST',headers:{'Content-Type':'application/x-www-form-urlencoded'},
    body:'api='+encodeURIComponent(document.getElementById('api').value)})
  .then(r=>r.text()).then(t=>{document.getElementById('msg').innerHTML='<div class="msg ok">'+t+'</div>';})
  .catch(()=>{document.getElementById('msg').innerHTML='<div class="msg err">Loi</div>';});
}
function saveWifi(){
  let ssid=document.getElementById('ssid').value;
  if(!ssid){document.getElementById('msg').innerHTML='<div class="msg err">Nhap SSID</div>';return;}
  fetch('/save',{method:'POST',headers:{'Content-Type':'application/x-www-form-urlencoded'},
    body:'ssid='+encodeURIComponent(ssid)+'&pass='+encodeURIComponent(document.getElementById('pass').value)+'&api='+encodeURIComponent(document.getElementById('api').value)})
  .then(r=>r.text()).then(t=>{document.getElementById('msg').innerHTML='<div class="msg ok">'+t+'</div>';})
  .catch(()=>{document.getElementById('msg').innerHTML='<div class="msg err">Loi</div>';});
}
function reset(){fetch('/reset').then(()=>{document.getElementById('msg').innerHTML='<div class="msg ok">Dang reset...</div>';});}
</script></body></html>)rawliteral";

// ── Web handlers ──────────────────────────────────
void handleRoot() {
    if (g_apMode) {
        String p = String(HTML_SETUP); p.replace("%API_URL%", g_api_url);
        server.send(200, "text/html", p);
    } else {
        String p = String(HTML_CONFIG);
        p.replace("%LOCAL_IP%",     WiFi.localIP().toString());
        p.replace("%CURRENT_SSID%", g_ssid);
        p.replace("%API_URL%",      g_api_url);
        server.send(200, "text/html", p);
    }
}

void handleScan() {
    int n = WiFi.scanNetworks();
    String json = "[";
    for (int i=0; i<n; i++) {
        if (i>0) json += ",";
        json += "{\"ssid\":\"" + WiFi.SSID(i) + "\",\"rssi\":" + WiFi.RSSI(i)
              + ",\"open\":" + (WiFi.encryptionType(i)==WIFI_AUTH_OPEN?"true":"false") + "}";
    }
    json += "]";
    server.send(200, "application/json", json);
}

void handleSave() {
    if (server.hasArg("ssid")) strncpy(g_ssid,     server.arg("ssid").c_str(), sizeof(g_ssid)-1);
    if (server.hasArg("pass")) strncpy(g_password, server.arg("pass").c_str(), sizeof(g_password)-1);
    if (server.hasArg("api"))  strncpy(g_api_url,  server.arg("api").c_str(),  sizeof(g_api_url)-1);
    savePrefs();
    server.send(200, "text/plain", "Da luu! Dang khoi dong lai...");
    delay(800);
    ESP.restart();
}

void handleUpdate() {
    if (server.hasArg("api")) strncpy(g_api_url, server.arg("api").c_str(), sizeof(g_api_url)-1);
    savePrefs();
    server.send(200, "text/plain", "API URL da cap nhat!");
}

void handleReset() {
    prefs.begin("cfg", false); prefs.clear(); prefs.end();
    server.send(200, "text/plain", "Dang reset...");
    delay(800);
    ESP.restart();
}

void startWebServer() {
    server.on("/",       HTTP_GET,  handleRoot);
    server.on("/scan",   HTTP_GET,  handleScan);
    server.on("/save",   HTTP_POST, handleSave);
    server.on("/update", HTTP_POST, handleUpdate);
    server.on("/reset",  HTTP_GET,  handleReset);
    server.begin();
    Serial.println("[WEB] Server started");
}

// ═════════════════════════════════════════════════
//  Task: Web server
// ═════════════════════════════════════════════════
void web_task(void* pv) {
    while (1) {
        if (g_apMode) dnsServer.processNextRequest();
        server.handleClient();
        vTaskDelay(5 / portTICK_PERIOD_MS);
    }
}

// ═════════════════════════════════════════════════
//  Task: Fetch dữ liệu - mỗi 60s
// ═════════════════════════════════════════════════
void fetch_task(void* pv) {
    vTaskDelay(1000 / portTICK_PERIOD_MS);

    while (1) {
        if (WiFi.status() == WL_CONNECTED) {
            bool ok = fetchAndParseData();
            if (ok) {
                g_dataReady = true;
                g_page = 0;
                drawCurrentPage();
                Serial.println("Đèn Blue");
                pixels.setPixelColor(0, pixels.Color(0, 0, 255)); // (Chỉ số LED, R, G, B)
                pixels.show(); // Cập nhật hiển thị lên đèn                
            } else {
                tft_showFetchError();
            }
        }
        vTaskDelay(60000 / portTICK_PERIOD_MS);
    }
}

// ═════════════════════════════════════════════════
//  Task: Chuyển trang - mỗi 10s
// ═════════════════════════════════════════════════
void display_task(void* pv) {
    while (!g_dataReady) vTaskDelay(500 / portTICK_PERIOD_MS);

    vTaskDelay(10000 / portTICK_PERIOD_MS);

    while (1) {
        if (g_dataReady) {
            g_page = (g_page + 1) % TOTAL_PAGES;
            drawCurrentPage();
            Serial.println("Đèn Xanh");
            pixels.setPixelColor(0, pixels.Color(0, 255, 0)); // (Chỉ số LED, R, G, B)
            pixels.show(); // Cập nhật hiển thị lên đèn
        }
        vTaskDelay(10000 / portTICK_PERIOD_MS);
    }
}

// ═════════════════════════════════════════════════
//  Setup
// ═════════════════════════════════════════════════
void setup() {
    Serial.begin(115200);
    delay(500);

    g_tftMutex = xSemaphoreCreateMutex();

    pixels.begin(); // Khởi động thư viện NeoPixel
    pixels.setBrightness(50); // Đặt độ sáng vừa phải (0-255) để tránh chói mắt và tiết kiệm điện
    Serial.println("Tắt đèn");
    pixels.clear(); // Xóa toàn bộ màu (đưa về 0, 0, 0)
    pixels.show();
    delay(1000);

    tft.init(SCREEN_HEIGHT, SCREEN_WIDTH); // init theo kích thước "dọc gốc" của panel ST7789
    tft.setRotation(TFT_ROTATION);         // xoay sang ngang 320x240
    tft.fillScreen(COLOR_BG);
    tft.fillRect(0, 0, SCREEN_WIDTH, 44, COLOR_HEADER);
    tft.setTextColor(COLOR_CYAN); tft.setTextSize(2);
    tft.setCursor(20,12); tft.println("ESP32-S3");
    tft.setTextColor(COLOR_TEXT); tft.setTextSize(1);
    tft.setCursor(6,56); tft.println("Dang khoi dong...");

    loadPrefs();

    if (strlen(g_ssid) == 0) {
        Serial.println("[MAIN] No config -> AP mode");
        g_apMode = true;
        WiFi.mode(WIFI_AP);
        WiFi.softAP(AP_SSID);
        delay(500);
        dnsServer.start(DNS_PORT, "*", WiFi.softAPIP());
        startWebServer();
        tft_showAPMode();

        xTaskCreatePinnedToCore(web_task, "Web", 4096, NULL, 5, NULL, 0);

    } else {
        Serial.printf("[MAIN] Connecting to %s\n", g_ssid);
        g_apMode = false;
        WiFi.mode(WIFI_STA);
        WiFi.begin(g_ssid, g_password);
        tft_showConnecting(g_ssid);

        int attempts = 0;
        while (WiFi.status() != WL_CONNECTED && attempts < 24) {
            delay(500); attempts++;
            Serial.print(".");
        }
        Serial.println();

        if (WiFi.status() != WL_CONNECTED) {
            Serial.println("[MAIN] WiFi FAILED -> AP fallback");
            tft_showWiFiFailed();
            g_apMode = true;
            WiFi.mode(WIFI_AP);
            WiFi.softAP(AP_SSID);
            delay(500);
            dnsServer.start(DNS_PORT, "*", WiFi.softAPIP());
            startWebServer();
            xTaskCreatePinnedToCore(web_task, "Web", 4096, NULL, 5, NULL, 0);
        } else {
            Serial.printf("[MAIN] WiFi OK - IP: %s\n", WiFi.localIP().toString().c_str());
            tft_showConnected();
            startWebServer();

            // ESP32-S3 có 2 core thật (dual-core), tận dụng pin task
            xTaskCreatePinnedToCore(web_task,     "Web",     4096, NULL, 5, NULL, 0);
            xTaskCreatePinnedToCore(fetch_task,   "Fetch",   8192, NULL, 4, NULL, 1);
            xTaskCreatePinnedToCore(display_task, "Display", 4096, NULL, 3, NULL, 1);
        }
    }
}

void loop() {
    vTaskDelay(1000 / portTICK_PERIOD_MS);
}