/**
 * Weekend Deep Sync — full Magic processing for large cities.
 *
 * Runs Fri/Sat/Sun nights 23:00–04:00. Processes cities in round-robin
 * (one step per city, then rotate) so progress is spread across cities.
 * State is persisted in KeyValueStore — survives restarts and continues
 * across multiple nights/weekends.
 *
 * Steps per city (each is resumable):
 *   1. sync_terenuri  — syncLayer TERENURI_ACTIVE
 *   2. sync_cladiri   — syncLayer CLADIRI_ACTIVE
 *   3. import_nogeom  — import parcels without geometry
 *   4. enrich         — enrichFeatures (slowest, naturally resumable)
 */

import { PrismaClient, Prisma } from "@prisma/client";
import { syncLayer } from "./sync-service";
import { EterraClient } from "./eterra-client";
import { isEterraAvailable } from "./eterra-health";
import { sendEmail } from "@/core/notifications/email-service";

const prisma = new PrismaClient();
const sleep = (ms: number) => new Promise((r) => setTimeout(r, ms));

/* ------------------------------------------------------------------ */
/*  Live activity tracking (globalThis — same process)                  */
/* ------------------------------------------------------------------ */

const g = globalThis as {
  __weekendSyncActivity?: {
    city: string;
    step: string;
    startedAt: string;
  } | null;
  __parcelSyncRunning?: boolean;
};

export function getWeekendSyncActivity() {
  return g.__weekendSyncActivity ?? null;
}

/* ------------------------------------------------------------------ */
/*  City queue configuration                                            */
/* ------------------------------------------------------------------ */

export type CityConfig = {
  siruta: string;
  name: string;
  county: string;
  priority: number; // lower = higher priority
};

/** Initial queue — priority 1 = first processed */
const DEFAULT_CITIES: CityConfig[] = [
  { siruta: "54975", name: "Cluj-Napoca", county: "Cluj", priority: 1 },
  { siruta: "32394", name: "Bistri\u021Ba", county: "Bistri\u021Ba-N\u0103s\u0103ud", priority: 1 },
  { siruta: "114319", name: "T\u00E2rgu Mure\u0219", county: "Mure\u0219", priority: 2 },
  { siruta: "139704", name: "Zal\u0103u", county: "S\u0103laj", priority: 2 },
  { siruta: "26564", name: "Oradea", county: "Bihor", priority: 2 },
  { siruta: "9262", name: "Arad", county: "Arad", priority: 2 },
  { siruta: "155243", name: "Timi\u0219oara", county: "Timi\u0219", priority: 2 },
  { siruta: "143450", name: "Sibiu", county: "Sibiu", priority: 2 },
  { siruta: "40198", name: "Bra\u0219ov", county: "Bra\u0219ov", priority: 2 },
];

/* ------------------------------------------------------------------ */
/*  Step definitions                                                    */
/* ------------------------------------------------------------------ */

const STEPS = [
  "sync_terenuri",
  "sync_cladiri",
  "import_nogeom",
  "enrich",
] as const;

type StepName = (typeof STEPS)[number];
type StepStatus = "pending" | "done" | "error";

/* ------------------------------------------------------------------ */
/*  Persisted state                                                     */
/* ------------------------------------------------------------------ */

type CityState = {
  siruta: string;
  name: string;
  county: string;
  priority: number;
  steps: Record<StepName, StepStatus>;
  lastActivity?: string;
  errorMessage?: string;
};

type WeekendSyncState = {
  cities: CityState[];
  lastSessionDate?: string;
  totalSessions: number;
  completedCycles: number; // how many full cycles (all cities done)
};

const KV_NAMESPACE = "parcel-sync-weekend";
const KV_KEY = "queue-state";

async function loadState(): Promise<WeekendSyncState> {
  const row = await prisma.keyValueStore.findUnique({
    where: { namespace_key: { namespace: KV_NAMESPACE, key: KV_KEY } },
  });
  if (row?.value && typeof row.value === "object") {
    return row.value as unknown as WeekendSyncState;
  }
  // Initialize with default cities
  return {
    cities: DEFAULT_CITIES.map((c) => ({
      ...c,
      steps: {
        sync_terenuri: "pending",
        sync_cladiri: "pending",
        import_nogeom: "pending",
        enrich: "pending",
      },
    })),
    totalSessions: 0,
    completedCycles: 0,
  };
}

async function saveState(state: WeekendSyncState): Promise<void> {
  // Retry once on failure — state persistence is critical for resume
  for (let attempt = 0; attempt < 2; attempt++) {
    try {
      await prisma.keyValueStore.upsert({
        where: { namespace_key: { namespace: KV_NAMESPACE, key: KV_KEY } },
        update: { value: state as unknown as Prisma.InputJsonValue },
        create: {
          namespace: KV_NAMESPACE,
          key: KV_KEY,
          value: state as unknown as Prisma.InputJsonValue,
        },
      });
      return;
    } catch (err) {
      if (attempt === 0) {
        console.warn("[weekend-sync] saveState retry...");
        await sleep(2000);
      } else {
        const msg = err instanceof Error ? err.message : String(err);
        console.error(`[weekend-sync] saveState failed: ${msg}`);
      }
    }
  }
}

/* ------------------------------------------------------------------ */
/*  Time window                                                         */
/* ------------------------------------------------------------------ */

const WEEKEND_START_HOUR = 23;
const WEEKEND_END_HOUR = 4;
const PAUSE_BETWEEN_STEPS_MS = 60_000 + Math.random() * 60_000; // 60-120s

/** Check if current time is within the weekend sync window */
export function isWeekendWindow(): boolean {
  const now = new Date();
  const day = now.getDay(); // 0=Sun, 5=Fri, 6=Sat
  const hour = now.getHours();

  // Fri 23:00+ or Sat 23:00+ or Sun 23:00+
  if ((day === 5 || day === 6 || day === 0) && hour >= WEEKEND_START_HOUR) {
    return true;
  }
  // Sat 00-04 (continuation of Friday night) or Sun 00-04 or Mon 00-04
  if ((day === 6 || day === 0 || day === 1) && hour < WEEKEND_END_HOUR) {
    return true;
  }
  return false;
}

/** Check if still within the window (called during processing) */
function stillInWindow(force?: boolean): boolean {
  if (force) {
    // Force mode: any night 22:00–05:00
    const hour = new Date().getHours();
    return hour >= 22 || hour < 5;
  }
  const hour = new Date().getHours();
  // We can be in 23,0,1,2,3 — stop at 4
  if (hour >= WEEKEND_END_HOUR && hour < WEEKEND_START_HOUR) return false;
  return isWeekendWindow();
}

/* ------------------------------------------------------------------ */
/*  Step executors                                                      */
/* ------------------------------------------------------------------ */

async function executeStep(
  city: CityState,
  step: StepName,
  client: EterraClient,
): Promise<{ success: boolean; message: string }> {
  const start = Date.now();

  switch (step) {
    case "sync_terenuri": {
      const res = await syncLayer(
        process.env.ETERRA_USERNAME!,
        process.env.ETERRA_PASSWORD!,
        city.siruta,
        "TERENURI_ACTIVE",
        { uatName: city.name, forceFullSync: true },
      );
      // Also sync admin layers (lightweight, non-fatal)
      for (const adminLayer of ["LIMITE_INTRAV_DYNAMIC", "LIMITE_UAT"]) {
        try {
          await syncLayer(
            process.env.ETERRA_USERNAME!,
            process.env.ETERRA_PASSWORD!,
            city.siruta,
            adminLayer,
            { uatName: city.name },
          );
        } catch {
          // admin layers are best-effort
        }
      }
      const dur = ((Date.now() - start) / 1000).toFixed(1);
      return {
        success: res.status === "done",
        message: `Terenuri: ${res.totalLocal} local (+${res.newFeatures}/-${res.removedFeatures}) + intravilan [${dur}s]`,
      };
    }

    case "sync_cladiri": {
      const res = await syncLayer(
        process.env.ETERRA_USERNAME!,
        process.env.ETERRA_PASSWORD!,
        city.siruta,
        "CLADIRI_ACTIVE",
        { uatName: city.name, forceFullSync: true },
      );
      const dur = ((Date.now() - start) / 1000).toFixed(1);
      return {
        success: res.status === "done",
        message: `Cl\u0103diri: ${res.totalLocal} local (+${res.newFeatures}/-${res.removedFeatures}) [${dur}s]`,
      };
    }

    case "import_nogeom": {
      const { syncNoGeometryParcels } = await import("./no-geom-sync");
      const res = await syncNoGeometryParcels(client, city.siruta);
      const dur = ((Date.now() - start) / 1000).toFixed(1);
      return {
        success: res.status !== "error",
        message: `No-geom: ${res.imported} importate, ${res.skipped} skip [${dur}s]`,
      };
    }

    case "enrich": {
      const { enrichFeatures } = await import("./enrich-service");
      const res = await enrichFeatures(client, city.siruta);
      const dur = ((Date.now() - start) / 1000).toFixed(1);
      return {
        success: res.status === "done",
        message: res.status === "done"
          ? `Enrichment: ${res.enrichedCount}/${res.totalFeatures ?? "?"} (${dur}s)`
          : `Enrichment eroare: ${res.error ?? "necunoscuta"} (${dur}s)`,
      };
    }
  }
}

/* ------------------------------------------------------------------ */
/*  Main runner                                                         */
/* ------------------------------------------------------------------ */

type SessionLog = {
  city: string;
  step: string;
  success: boolean;
  message: string;
};

export async function runWeekendDeepSync(options?: {
  force?: boolean;
}): Promise<void> {
  const force = options?.force ?? false;
  const username = process.env.ETERRA_USERNAME;
  const password = process.env.ETERRA_PASSWORD;
  if (!username || !password) return;

  if (!isEterraAvailable()) {
    console.log("[weekend-sync] eTerra indisponibil, skip.");
    return;
  }

  const state = await loadState();
  const today = new Date().toISOString().slice(0, 10);

  // Prevent running twice in the same session (force bypasses)
  if (!force && state.lastSessionDate === today) return;

  state.totalSessions++;
  state.lastSessionDate = today;

  // Ensure new default cities are added if config expanded
  for (const dc of DEFAULT_CITIES) {
    if (!state.cities.some((c) => c.siruta === dc.siruta)) {
      state.cities.push({
        ...dc,
        steps: {
          sync_terenuri: "pending",
          sync_cladiri: "pending",
          import_nogeom: "pending",
          enrich: "pending",
        },
      });
    }
  }

  const sessionStart = Date.now();
  const log: SessionLog[] = [];
  let stepsCompleted = 0;

  console.log(
    `[weekend-sync] Sesiune #${state.totalSessions} pornita. ${state.cities.length} orase in coada.`,
  );

  // Sort cities: priority first, then shuffle within same priority
  const sorted = [...state.cities].sort((a, b) => {
    if (a.priority !== b.priority) return a.priority - b.priority;
    return Math.random() - 0.5; // random within same priority
  });

  // Round-robin: iterate through steps, for each step iterate through cities
  for (const stepName of STEPS) {
    // Find cities that still need this step
    const needsStep = sorted.filter((c) => c.steps[stepName] === "pending");
    if (needsStep.length === 0) continue;

    for (const city of needsStep) {
      // Check time window
      if (!stillInWindow(force)) {
        console.log("[weekend-sync] Fereastra s-a inchis, opresc.");
        g.__weekendSyncActivity = null;
        await saveState(state);
        await sendStatusEmail(state, log, sessionStart);
        return;
      }

      // Check eTerra health
      if (!isEterraAvailable()) {
        console.log("[weekend-sync] eTerra indisponibil, opresc.");
        g.__weekendSyncActivity = null;
        await saveState(state);
        await sendStatusEmail(state, log, sessionStart);
        return;
      }

      // Pause between steps
      if (stepsCompleted > 0) {
        const pause = 60_000 + Math.random() * 60_000;
        console.log(
          `[weekend-sync] Pauza ${Math.round(pause / 1000)}s inainte de ${city.name} / ${stepName}`,
        );
        await sleep(pause);
      }

      // Execute step — fresh client per step (sessions expire after ~10 min)
      console.log(`[weekend-sync] ${city.name}: ${stepName}...`);
      g.__weekendSyncActivity = {
        city: city.name,
        step: stepName,
        startedAt: new Date().toISOString(),
      };
      try {
        const client = await EterraClient.create(username, password);
        const result = await executeStep(city, stepName, client);
        city.steps[stepName] = result.success ? "done" : "error";
        if (!result.success) {
          city.errorMessage = result.message;
          await sendStepErrorEmail(city, stepName, result.message);
        }
        city.lastActivity = new Date().toISOString();
        log.push({
          city: city.name,
          step: stepName,
          success: result.success,
          message: result.message,
        });
        console.log(
          `[weekend-sync] ${city.name}: ${stepName} → ${result.success ? "OK" : "EROARE"} — ${result.message}`,
        );
      } catch (err) {
        const msg = err instanceof Error ? err.message : String(err);
        city.steps[stepName] = "error";
        city.errorMessage = msg;
        city.lastActivity = new Date().toISOString();
        log.push({
          city: city.name,
          step: stepName,
          success: false,
          message: msg,
        });
        console.error(
          `[weekend-sync] ${city.name}: ${stepName} EROARE: ${msg}`,
        );
        await sendStepErrorEmail(city, stepName, msg);
      }
      g.__weekendSyncActivity = null;

      stepsCompleted++;
      // Save state after each step (crash safety)
      await saveState(state);
    }
  }

  // Check if all cities completed all steps → new cycle
  const allDone = state.cities.every((c) =>
    STEPS.every((s) => c.steps[s] === "done"),
  );
  if (allDone) {
    state.completedCycles++;
    // Reset for next cycle
    for (const city of state.cities) {
      for (const step of STEPS) {
        city.steps[step] = "pending";
      }
    }
    console.log(
      `[weekend-sync] Ciclu complet #${state.completedCycles}! Reset pentru urmatorul ciclu.`,
    );
    // Notify N8N to rebuild PMTiles (overview tiles for geoportal)
    await fireSyncWebhook(state.completedCycles);
  }

  await saveState(state);
  await sendStatusEmail(state, log, sessionStart);
  console.log(`[weekend-sync] Sesiune finalizata. ${stepsCompleted} pasi executati.`);
}

/* ------------------------------------------------------------------ */
/*  Immediate error email                                               */
/* ------------------------------------------------------------------ */

async function sendStepErrorEmail(
  city: CityState,
  step: StepName,
  errorMsg: string,
): Promise<void> {
  const emailTo = process.env.WEEKEND_SYNC_EMAIL;
  if (!emailTo) return;

  try {
    const now = new Date();
    const timeStr = now.toLocaleString("ro-RO", {
      day: "2-digit",
      month: "2-digit",
      year: "numeric",
      hour: "2-digit",
      minute: "2-digit",
    });
    const stepLabel: Record<StepName, string> = {
      sync_terenuri: "Sync Terenuri",
      sync_cladiri: "Sync Cladiri",
      import_nogeom: "Import No-Geom",
      enrich: "Enrichment",
    };

    const html = `
      <div style="font-family:system-ui,sans-serif;max-width:600px;margin:0 auto">
        <h2 style="color:#ef4444;margin-bottom:4px">Weekend Sync — Eroare</h2>
        <p style="color:#6b7280;margin-top:0">${timeStr}</p>
        <table style="border-collapse:collapse;width:100%;border:1px solid #fecaca;border-radius:6px;background:#fef2f2">
          <tr>
            <td style="padding:8px 12px;font-weight:600;color:#374151">Oras</td>
            <td style="padding:8px 12px">${city.name} (${city.county})</td>
          </tr>
          <tr>
            <td style="padding:8px 12px;font-weight:600;color:#374151">Pas</td>
            <td style="padding:8px 12px">${stepLabel[step]}</td>
          </tr>
          <tr>
            <td style="padding:8px 12px;font-weight:600;color:#374151">Eroare</td>
            <td style="padding:8px 12px;color:#dc2626;word-break:break-word">${errorMsg}</td>
          </tr>
        </table>
        <p style="color:#9ca3af;font-size:11px;margin-top:16px">
          Generat automat de ArchiTools Weekend Sync
        </p>
      </div>
    `;

    await sendEmail({
      to: emailTo,
      subject: `[ArchiTools] WDS Eroare: ${city.name} — ${stepLabel[step]}`,
      html,
    });
    console.log(`[weekend-sync] Email eroare trimis: ${city.name}/${step}`);
  } catch (err) {
    const msg = err instanceof Error ? err.message : String(err);
    console.warn(`[weekend-sync] Nu s-a putut trimite email eroare: ${msg}`);
  }
}

/* ------------------------------------------------------------------ */
/*  Email status report                                                 */
/* ------------------------------------------------------------------ */

async function sendStatusEmail(
  state: WeekendSyncState,
  log: SessionLog[],
  sessionStart: number,
): Promise<void> {
  const emailTo = process.env.WEEKEND_SYNC_EMAIL;
  if (!emailTo) return;

  try {
    const duration = Date.now() - sessionStart;
    const durMin = Math.round(duration / 60_000);
    const durStr =
      durMin >= 60
        ? `${Math.floor(durMin / 60)}h ${durMin % 60}m`
        : `${durMin}m`;

    const now = new Date();
    const dayNames = [
      "Duminic\u0103",
      "Luni",
      "Mar\u021Bi",
      "Miercuri",
      "Joi",
      "Vineri",
      "S\u00E2mb\u0103t\u0103",
    ];
    const dayName = dayNames[now.getDay()] ?? "";
    const dateStr = now.toLocaleDateString("ro-RO", {
      day: "2-digit",
      month: "2-digit",
      year: "numeric",
    });

    // Build city progress table
    const cityRows = state.cities
      .sort((a, b) => a.priority - b.priority)
      .map((c) => {
        const doneCount = STEPS.filter((s) => c.steps[s] === "done").length;
        const errorCount = STEPS.filter((s) => c.steps[s] === "error").length;
        const icon =
          doneCount === STEPS.length
            ? "\u2713"
            : doneCount > 0
              ? "\u25D0"
              : "\u25CB";
        const color =
          doneCount === STEPS.length
            ? "#22c55e"
            : errorCount > 0
              ? "#ef4444"
              : doneCount > 0
                ? "#f59e0b"
                : "#9ca3af";
        const stepDetail = STEPS.map(
          (s) =>
            `<span style="color:${c.steps[s] === "done" ? "#22c55e" : c.steps[s] === "error" ? "#ef4444" : "#9ca3af"}">${s.replace("_", " ")}</span>`,
        ).join(" \u2192 ");
        return `<tr>
          <td style="padding:4px 8px;color:${color};font-size:16px">${icon}</td>
          <td style="padding:4px 8px;font-weight:600">${c.name}</td>
          <td style="padding:4px 8px;color:#6b7280;font-size:12px">${c.county}</td>
          <td style="padding:4px 8px">${doneCount}/${STEPS.length}</td>
          <td style="padding:4px 8px;font-size:11px">${stepDetail}</td>
        </tr>`;
      })
      .join("\n");

    // Build session log
    const logRows =
      log.length > 0
        ? log
            .map(
              (l) =>
                `<tr>
              <td style="padding:2px 6px;font-size:12px">${l.success ? "\u2713" : "\u2717"}</td>
              <td style="padding:2px 6px;font-size:12px">${l.city}</td>
              <td style="padding:2px 6px;font-size:12px;color:#6b7280">${l.step}</td>
              <td style="padding:2px 6px;font-size:11px;color:#6b7280">${l.message}</td>
            </tr>`,
            )
            .join("\n")
        : '<tr><td colspan="4" style="padding:8px;color:#9ca3af;font-size:12px">Niciun pas executat in aceasta sesiune</td></tr>';

    const html = `
      <div style="font-family:system-ui,sans-serif;max-width:700px;margin:0 auto">
        <h2 style="color:#1f2937;margin-bottom:4px">Weekend Sync — ${dayName} ${dateStr}</h2>
        <p style="color:#6b7280;margin-top:0">Durata sesiune: ${durStr} | Sesiunea #${state.totalSessions} | Cicluri complete: ${state.completedCycles}</p>

        <h3 style="color:#374151;margin-bottom:8px">Progres per ora\u0219</h3>
        <table style="border-collapse:collapse;width:100%;border:1px solid #e5e7eb;border-radius:6px">
          <thead><tr style="background:#f9fafb">
            <th style="padding:6px 8px;text-align:left;font-size:12px"></th>
            <th style="padding:6px 8px;text-align:left;font-size:12px">Ora\u0219</th>
            <th style="padding:6px 8px;text-align:left;font-size:12px">Jude\u021B</th>
            <th style="padding:6px 8px;text-align:left;font-size:12px">Pa\u0219i</th>
            <th style="padding:6px 8px;text-align:left;font-size:12px">Detaliu</th>
          </tr></thead>
          <tbody>${cityRows}</tbody>
        </table>

        <h3 style="color:#374151;margin-top:16px;margin-bottom:8px">Activitate sesiune curent\u0103</h3>
        <table style="border-collapse:collapse;width:100%;border:1px solid #e5e7eb">
          <tbody>${logRows}</tbody>
        </table>

        <p style="color:#9ca3af;font-size:11px;margin-top:16px">
          Generat automat de ArchiTools Weekend Sync
        </p>
      </div>
    `;

    await sendEmail({
      to: emailTo,
      subject: `[ArchiTools] Weekend Sync — ${dayName} ${dateStr}`,
      html,
    });
    console.log(`[weekend-sync] Email status trimis la ${emailTo}`);
  } catch (err) {
    const msg = err instanceof Error ? err.message : String(err);
    console.warn(`[weekend-sync] Nu s-a putut trimite email: ${msg}`);
  }
}

/* ------------------------------------------------------------------ */
/*  Manual force trigger                                                */
/* ------------------------------------------------------------------ */

/**
 * Trigger a sync run outside the weekend window.
 * Resets error steps, clears lastSessionDate, and starts immediately.
 * Uses an extended night window (22:00–05:00) for the stillInWindow check.
 */
export async function triggerForceSync(): Promise<{ started: boolean; reason?: string }> {
  if (g.__parcelSyncRunning) {
    return { started: false, reason: "O sincronizare ruleaza deja" };
  }

  const username = process.env.ETERRA_USERNAME;
  const password = process.env.ETERRA_PASSWORD;
  if (!username || !password) {
    return { started: false, reason: "ETERRA credentials lipsesc" };
  }

  if (!isEterraAvailable()) {
    return { started: false, reason: "eTerra indisponibil" };
  }

  // Reset error steps + lastSessionDate in DB so the run proceeds
  const state = await loadState();
  for (const city of state.cities) {
    for (const step of STEPS) {
      if (city.steps[step] === "error") {
        city.steps[step] = "pending";
        city.errorMessage = undefined;
      }
    }
  }
  state.lastSessionDate = undefined;
  await saveState(state);

  // Start in background — don't block the API response
  g.__parcelSyncRunning = true;
  void (async () => {
    try {
      console.log("[weekend-sync] Force sync declansat manual.");
      await runWeekendDeepSync({ force: true });
    } catch (err) {
      const msg = err instanceof Error ? err.message : String(err);
      console.error(`[weekend-sync] Force sync eroare: ${msg}`);
    } finally {
      g.__parcelSyncRunning = false;
    }
  })();

  return { started: true };
}

/* ------------------------------------------------------------------ */
/*  N8N Webhook — trigger PMTiles rebuild after sync cycle             */
/* ------------------------------------------------------------------ */

async function fireSyncWebhook(cycle: number): Promise<void> {
  const url = process.env.N8N_WEBHOOK_URL;
  if (!url) return;

  try {
    await fetch(url, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        event: "weekend-sync-cycle-complete",
        cycle,
        timestamp: new Date().toISOString(),
      }),
    });
    console.log(`[weekend-sync] Webhook trimis la N8N (ciclu #${cycle})`);
  } catch (err) {
    const msg = err instanceof Error ? err.message : String(err);
    console.warn(`[weekend-sync] Webhook N8N esuat: ${msg}`);
  }
}