import { postgresClient } from './postgres-client';
import { ZabbixClient } from './zabbix-client';

export interface MorningSummaryProblem {
  eventid: string;
  hostid: string;
  hostName: string;
  clientName: string;
  triggerName: string;
  severity: number;
  severityLabel: string;
  startedAt: Date;
  durationLabel: string;
  acknowledged: boolean;
  needsAttention: boolean;
}

export interface MorningSummaryResolved {
  eventid: string;
  hostName: string;
  clientName: string;
  triggerName: string;
  startedAt: Date;
  resolvedAt: Date;
  durationLabel: string;
}

export interface MorningSummary {
  generatedAt: Date;
  windowFrom: Date;
  windowTo: Date;
  isWeekendWindow: boolean;
  openProblems: MorningSummaryProblem[];
  resolvedOvernight: MorningSummaryResolved[];
  openCount: number;
  resolvedCount: number;
  mttrMinutes: number | null;
  clientsAffected: string[];
}

export interface WebhookConfig {
  id: number;
  label: string;
  webhook_url: string;
  enabled: boolean;
  last_delivered_at: string | null;
  last_status: string | null;
  created_at: string;
}

export interface SummaryConfig {
  weekend_suppression: boolean;
  monday_extended_window: boolean;
  severity_filter: number;
  outages_only: boolean;
}

export interface DeliveryResult {
  webhookId: number;
  label: string;
  success: boolean;
  httpStatus?: number;
  error?: string;
}

const SEVERITY_LABELS: Record<number, string> = {
  0: 'Not classified',
  1: 'Information',
  2: 'Warning',
  3: 'Average',
  4: 'High',
  5: 'Disaster',
};

function formatDuration(ms: number): string {
  const totalMinutes = Math.floor(ms / 60000);
  if (totalMinutes < 1) return '<1m';
  if (totalMinutes < 60) return `${totalMinutes}m`;
  const hours = Math.floor(totalMinutes / 60);
  const mins = totalMinutes % 60;
  return mins > 0 ? `${hours}h ${mins}m` : `${hours}h`;
}

function makeZabbix(): ZabbixClient {
  if (!process.env.ZABBIX_API_URL || !process.env.ZABBIX_API_TOKEN) {
    throw new Error('Zabbix not configured: ZABBIX_API_URL and ZABBIX_API_TOKEN required');
  }
  return new ZabbixClient({
    apiUrl: process.env.ZABBIX_API_URL,
    apiToken: process.env.ZABBIX_API_TOKEN,
  });
}

function getWindowStart(now: Date, config: SummaryConfig): { from: Date; isWeekend: boolean } {
  const day = now.getDay(); // 0=Sun,1=Mon
  if (day === 1 && config.monday_extended_window) {
    const friday = new Date(now);
    friday.setDate(friday.getDate() - 3);
    friday.setHours(18, 0, 0, 0);
    return { from: friday, isWeekend: true };
  }
  const yesterday = new Date(now);
  yesterday.setDate(yesterday.getDate() - 1);
  yesterday.setHours(18, 0, 0, 0);
  return { from: yesterday, isWeekend: false };
}

function buildAdaptiveCard(summary: MorningSummary): object {
  const headerText = `☀️ Morning NOC Summary${summary.isWeekendWindow ? ' — Weekend Coverage' : ''}`;

  const mttrText = summary.mttrMinutes != null ? formatDuration(summary.mttrMinutes * 60000) : '—';

  const statsColumns = {
    type: 'ColumnSet',
    columns: [
      {
        type: 'Column', width: 'stretch',
        items: [{
          type: 'TextBlock',
          text: `${summary.openCount} Open`,
          weight: 'Bolder', color: summary.openCount > 0 ? 'Attention' : 'Default',
          wrap: true,
        }],
      },
      {
        type: 'Column', width: 'stretch',
        items: [{
          type: 'TextBlock',
          text: `${summary.resolvedCount} Resolved`,
          weight: 'Bolder', color: summary.resolvedCount > 0 ? 'Good' : 'Default',
          wrap: true,
        }],
      },
      {
        type: 'Column', width: 'stretch',
        items: [{
          type: 'TextBlock',
          text: `${mttrText} MTTR`,
          weight: 'Bolder', wrap: true,
        }],
      },
    ],
  };

  const bodyItems: object[] = [
    { type: 'TextBlock', text: headerText, weight: 'Bolder', size: 'Large', wrap: true },
    statsColumns,
    { type: 'TextBlock', text: ' ', spacing: 'None' },
  ];

  // Open issues section
  if (summary.openProblems.length > 0) {
    const facts = summary.openProblems.map(p => ({
      title: `${p.clientName} / ${p.hostName}`,
      value: `${p.triggerName} — ${p.durationLabel}`,
    }));

    bodyItems.push({
      type: 'Container',
      style: 'attention',
      items: [
        { type: 'TextBlock', text: 'Open Issues', weight: 'Bolder', color: 'Attention', wrap: true },
        { type: 'FactSet', facts },
      ],
    });
  } else {
    bodyItems.push({
      type: 'Container',
      style: 'good',
      items: [{ type: 'TextBlock', text: 'All Clear — No open issues', weight: 'Bolder', color: 'Good', wrap: true }],
    });
  }

  // Resolved overnight section
  if (summary.resolvedOvernight.length > 0) {
    const shown = summary.resolvedOvernight.slice(0, 5);
    const extra = summary.resolvedOvernight.length - 5;
    const facts = shown.map(r => ({
      title: `${r.clientName} / ${r.hostName}`,
      value: `${r.triggerName} — ${r.durationLabel}`,
    }));
    if (extra > 0) {
      facts.push({ title: '', value: `+${extra} more — all resolved` });
    }

    bodyItems.push({
      type: 'Container',
      style: 'good',
      items: [
        { type: 'TextBlock', text: 'Resolved', weight: 'Bolder', color: 'Good', wrap: true },
        { type: 'FactSet', facts },
      ],
    });
  }

  // Window info footer
  const windowFrom = summary.windowFrom.toLocaleString('en-US', { month: 'short', day: 'numeric', hour: 'numeric', minute: '2-digit', hour12: true });
  const windowTo = summary.windowTo.toLocaleString('en-US', { hour: 'numeric', minute: '2-digit', hour12: true });
  bodyItems.push({
    type: 'TextBlock',
    text: `Window: ${windowFrom} → ${windowTo}`,
    size: 'Small', color: 'Default', isSubtle: true, wrap: true, spacing: 'Small',
  });

  return {
    $schema: 'http://adaptivecards.io/schemas/adaptive-card.json',
    type: 'AdaptiveCard',
    version: '1.4',
    body: bodyItems,
    actions: [
      { type: 'Action.OpenUrl', title: 'Open Pulse', url: 'https://pulse.wulfconsulting.cloud' },
      { type: 'Action.OpenUrl', title: 'View Problems', url: 'https://zabbix.wulfconsulting.cloud/zabbix.php?action=problem.view' },
    ],
  };
}

export class MorningSummaryService {
  async getConfig(): Promise<SummaryConfig> {
    const result = await postgresClient.query('SELECT * FROM morning_summary_config WHERE id = 1');
    if (result.rows.length === 0) {
      return { weekend_suppression: true, monday_extended_window: true, severity_filter: 2, outages_only: false };
    }
    return result.rows[0] as SummaryConfig;
  }

  async updateConfig(updates: Partial<SummaryConfig>): Promise<SummaryConfig> {
    const fields: string[] = [];
    const values: unknown[] = [];
    let idx = 1;

    if (updates.weekend_suppression !== undefined) { fields.push(`weekend_suppression = $${idx++}`); values.push(updates.weekend_suppression); }
    if (updates.monday_extended_window !== undefined) { fields.push(`monday_extended_window = $${idx++}`); values.push(updates.monday_extended_window); }
    if (updates.severity_filter !== undefined) { fields.push(`severity_filter = $${idx++}`); values.push(updates.severity_filter); }
    if (updates.outages_only !== undefined) { fields.push(`outages_only = $${idx++}`); values.push(updates.outages_only); }

    if (fields.length === 0) return this.getConfig();
    fields.push('updated_at = NOW()');
    values.push(1);

    const result = await postgresClient.query(
      `UPDATE morning_summary_config SET ${fields.join(', ')} WHERE id = $${idx} RETURNING *`,
      values
    );
    return result.rows[0] as SummaryConfig;
  }

  async getWebhooks(): Promise<WebhookConfig[]> {
    const result = await postgresClient.query('SELECT * FROM morning_summary_webhooks ORDER BY id');
    return result.rows as WebhookConfig[];
  }

  async createWebhook(label: string, webhookUrl: string): Promise<WebhookConfig> {
    const result = await postgresClient.query(
      'INSERT INTO morning_summary_webhooks (label, webhook_url, enabled) VALUES ($1, $2, true) RETURNING *',
      [label, webhookUrl]
    );
    return result.rows[0] as WebhookConfig;
  }

  async updateWebhook(id: number, updates: { label?: string; webhook_url?: string; enabled?: boolean }): Promise<WebhookConfig> {
    const fields: string[] = [];
    const values: unknown[] = [];
    let idx = 1;

    if (updates.label !== undefined) { fields.push(`label = $${idx++}`); values.push(updates.label); }
    if (updates.webhook_url !== undefined) { fields.push(`webhook_url = $${idx++}`); values.push(updates.webhook_url); }
    if (updates.enabled !== undefined) { fields.push(`enabled = $${idx++}`); values.push(updates.enabled); }

    if (fields.length === 0) throw new Error('No fields to update');
    values.push(id);

    const result = await postgresClient.query(
      `UPDATE morning_summary_webhooks SET ${fields.join(', ')} WHERE id = $${idx} RETURNING *`,
      values
    );
    return result.rows[0] as WebhookConfig;
  }

  async deleteWebhook(id: number): Promise<void> {
    await postgresClient.query('DELETE FROM morning_summary_webhooks WHERE id = $1', [id]);
  }

  async getLatestSummaryRow(): Promise<{
    id: number;
    generated_at: string;
    window_from: string;
    window_to: string;
    open_count: number;
    resolved_count: number;
    mttr_minutes: number | null;
    clients_affected: string[];
    is_weekend_window: boolean;
    card_payload: object | null;
    delivery_status: object;
  } | null> {
    const result = await postgresClient.query('SELECT * FROM morning_summaries ORDER BY generated_at DESC LIMIT 1');
    return result.rows.length > 0 ? result.rows[0] : null;
  }

  async getSummaryHistory(limit = 10): Promise<Array<{
    id: number;
    generated_at: string;
    open_count: number;
    resolved_count: number;
    mttr_minutes: number | null;
    is_weekend_window: boolean;
    delivery_status: object;
  }>> {
    const result = await postgresClient.query(
      'SELECT id, generated_at, open_count, resolved_count, mttr_minutes, is_weekend_window, delivery_status FROM morning_summaries ORDER BY generated_at DESC LIMIT $1',
      [limit]
    );
    return result.rows;
  }

  /**
   * Pull data from Zabbix and build the MorningSummary + Adaptive Card.
   */
  async aggregate(overrideWindowFrom?: Date): Promise<{ summary: MorningSummary; card: object }> {
    const now = new Date();
    const config = await this.getConfig();
    const { from: windowFrom, isWeekend } = overrideWindowFrom
      ? { from: overrideWindowFrom, isWeekend: false }
      : getWindowStart(now, config);

    const zabbix = makeZabbix();

    // Fetch open problems and resolved events in parallel
    const [rawProblems, rawResolved] = await Promise.all([
      zabbix.getOpenProblems(config.severity_filter),
      zabbix.getResolvedEvents(windowFrom, now),
    ]);

    // Build the set of unique triggerids from both result sets
    const allTriggerIds = [
      ...new Set([
        ...rawProblems.map(p => p.objectid),
        ...rawResolved.map(e => e.objectid),
      ]),
    ];

    // Resolve triggerid → { hostid, hostName } for ENABLED hosts only.
    // Triggerids tied solely to disabled hosts will be absent from this map.
    const triggerHostMap = await zabbix.getTriggerEnabledHosts(allTriggerIds);

    // Fetch groups for every enabled hostid so we can derive clientName
    const enabledHostIds = [...new Set([...triggerHostMap.values()].map(h => h.hostid))];
    const groupMap = await zabbix.getHostGroupMap(enabledHostIds);

    function resolveClient(triggerid: string): { hostid: string; hostName: string; clientName: string } {
      const host = triggerHostMap.get(triggerid);
      if (!host) return { hostid: '', hostName: 'Unknown', clientName: 'Unknown' };
      const groups = groupMap.get(host.hostid) ?? [];
      const clientGroup = groups.find((g: string) => g.startsWith('Clients/'));
      const clientName = clientGroup ? clientGroup.replace('Clients/', '').trim() : host.hostName;
      return { hostid: host.hostid, hostName: host.hostName, clientName };
    }

    // Only include problems whose trigger maps to an enabled host; optionally filter to outages only
    const openProblems: MorningSummaryProblem[] = rawProblems
      .filter(p => triggerHostMap.has(p.objectid))
      .filter(p => !config.outages_only || p.name.toLowerCase().includes('unavailable'))
      .map(p => {
        const { hostid, hostName, clientName } = resolveClient(p.objectid);
        const severity = parseInt(p.severity, 10);
        const startedAt = new Date(parseInt(p.clock, 10) * 1000);
        const durationMs = now.getTime() - startedAt.getTime();
        const ackArray = Array.isArray(p.acknowledges) ? p.acknowledges : [];
        const acknowledged = ackArray.length > 0;
        const needsAttention = !acknowledged && durationMs > 4 * 60 * 60 * 1000;

        return {
          eventid: p.eventid,
          hostid,
          hostName,
          clientName,
          triggerName: p.name,
          severity,
          severityLabel: SEVERITY_LABELS[severity] ?? 'Unknown',
          startedAt,
          durationLabel: formatDuration(durationMs),
          acknowledged,
          needsAttention,
        };
      });

    // Sort: needs attention first, then by severity desc, then by duration desc
    openProblems.sort((a, b) => {
      if (a.needsAttention !== b.needsAttention) return a.needsAttention ? -1 : 1;
      if (b.severity !== a.severity) return b.severity - a.severity;
      return b.startedAt.getTime() - a.startedAt.getTime();
    });

    // Only include resolved events whose trigger maps to an enabled host; optionally filter to outages only
    const resolvedOvernight: MorningSummaryResolved[] = rawResolved
      .filter(ev => triggerHostMap.has(ev.objectid))
      .filter(ev => !config.outages_only || ev.name.toLowerCase().includes('unavailable'))
      .map(ev => {
        const { hostName, clientName } = resolveClient(ev.objectid);
        const startedAt = new Date(parseInt(ev.clock, 10) * 1000);
        const resolvedAt = ev.r_clock ? new Date(parseInt(ev.r_clock, 10) * 1000) : now;
        const durationMs = resolvedAt.getTime() - startedAt.getTime();

        return {
          eventid: ev.eventid,
          hostName,
          clientName,
          triggerName: ev.name,
          startedAt,
          resolvedAt,
          durationLabel: formatDuration(durationMs),
        };
      });

    // Stats
    const mttrMinutes = resolvedOvernight.length > 0
      ? Math.round(resolvedOvernight.reduce((sum, r) => {
          return sum + (r.resolvedAt.getTime() - r.startedAt.getTime()) / 60000;
        }, 0) / resolvedOvernight.length)
      : null;

    const clientsAffected = [...new Set(openProblems.map(p => p.clientName))].sort();

    const summary: MorningSummary = {
      generatedAt: now,
      windowFrom,
      windowTo: now,
      isWeekendWindow: isWeekend,
      openProblems,
      resolvedOvernight,
      openCount: openProblems.length,
      resolvedCount: resolvedOvernight.length,
      mttrMinutes,
      clientsAffected,
    };

    const card = buildAdaptiveCard(summary);

    // Persist
    await postgresClient.query(
      `INSERT INTO morning_summaries
         (generated_at, window_from, window_to, open_count, resolved_count, mttr_minutes,
          clients_affected, is_weekend_window, card_payload, delivery_status)
       VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)`,
      [
        now, windowFrom, now,
        summary.openCount, summary.resolvedCount, summary.mttrMinutes,
        summary.clientsAffected, summary.isWeekendWindow,
        JSON.stringify(card), JSON.stringify({}),
      ]
    );

    return { summary, card };
  }

  /**
   * Post an Adaptive Card to one or more webhook URLs.
   * Returns per-webhook results and updates DB delivery_status.
   */
  async deliver(card: object, webhookIds?: number[]): Promise<DeliveryResult[]> {
    const all = await this.getWebhooks();
    const targets = webhookIds
      ? all.filter(w => webhookIds.includes(w.id))
      : all.filter(w => w.enabled);

    const envelope = {
      type: 'message',
      attachments: [{
        contentType: 'application/vnd.microsoft.card.adaptive',
        contentUrl: null,
        content: card,
      }],
    };

    const results: DeliveryResult[] = await Promise.all(
      targets.map(async (webhook): Promise<DeliveryResult> => {
        try {
          const res = await fetch(webhook.webhook_url, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(envelope),
          });

          const success = res.ok;
          const httpStatus = res.status;

          await postgresClient.query(
            `UPDATE morning_summary_webhooks
             SET last_delivered_at = NOW(), last_status = $1 WHERE id = $2`,
            [success ? 'success' : 'failed', webhook.id]
          );

          return { webhookId: webhook.id, label: webhook.label, success, httpStatus };
        } catch (err) {
          const error = err instanceof Error ? err.message : String(err);
          await postgresClient.query(
            `UPDATE morning_summary_webhooks SET last_delivered_at = NOW(), last_status = 'failed' WHERE id = $1`,
            [webhook.id]
          );
          return { webhookId: webhook.id, label: webhook.label, success: false, error };
        }
      })
    );

    // Update delivery_status on the latest summary row
    const statusMap: Record<number, object> = {};
    for (const r of results) {
      statusMap[r.webhookId] = { success: r.success, httpStatus: r.httpStatus, error: r.error };
    }
    await postgresClient.query(
      `UPDATE morning_summaries SET delivery_status = $1
       WHERE id = (SELECT id FROM morning_summaries ORDER BY generated_at DESC LIMIT 1)`,
      [JSON.stringify(statusMap)]
    );

    return results;
  }

  /**
   * Full run: aggregate + deliver. Used by scheduler and /send endpoint.
   */
  async run(webhookIds?: number[]): Promise<{ summary: MorningSummary; results: DeliveryResult[] }> {
    const { summary, card } = await this.aggregate();
    const results = await this.deliver(card, webhookIds);
    console.log(`[MORNING-SUMMARY] Open: ${summary.openCount}, Resolved: ${summary.resolvedCount}, Webhooks: ${results.length}`);
    return { summary, results };
  }

  /**
   * Test send: aggregate current data and send to a single webhook only.
   */
  async testSend(webhookId: number): Promise<DeliveryResult> {
    const { card } = await this.aggregate();
    const results = await this.deliver(card, [webhookId]);
    return results[0] ?? { webhookId, label: '', success: false, error: 'Webhook not found' };
  }
}

let _instance: MorningSummaryService | null = null;
export function getMorningSummaryService(): MorningSummaryService {
  if (!_instance) _instance = new MorningSummaryService();
  return _instance;
}