'use strict';
const { Router }    = require('express');
const { getAllTests, getConfig } = require('../db');

const router = Router();

router.get('/', (req, res) => {
  const tests = getAllTests();

  // ── Overall ───────────────────────────────────────────────────────────────
  const totalCompleted = tests.filter(t => t.completed).length;
  const overall = {
    total:          tests.length,
    completed:      totalCompleted,
    completionRate: tests.length > 0 ? totalCompleted / tests.length : 0,
  };

  // ── Per device ────────────────────────────────────────────────────────────
  const deviceMap = new Map();
  for (const t of tests) {
    if (!t.device) continue;
    if (!deviceMap.has(t.device)) deviceMap.set(t.device, { total: 0, completed: 0 });
    const d = deviceMap.get(t.device);
    d.total++;
    if (t.completed) d.completed++;
  }
  const devices = Array.from(deviceMap.entries())
    .sort(([a], [b]) => a.localeCompare(b))
    .map(([name, d]) => ({
      name,
      total:          d.total,
      completed:      d.completed,
      completionRate: d.total > 0 ? d.completed / d.total : 0,
    }));

  // ── Elapsed = sum of individual test durations ────────────────────────────
  const elapsedSeconds = tests.reduce((sum, t) => {
    return t.completed && t.duration_seconds != null ? sum + t.duration_seconds : sum;
  }, 0);

  // ── Per-type averages and remaining counts ────────────────────────────────
  const TYPES = ['COE', 'P2P', 'P3P'];
  const byType = {};
  let estimatedRemainingSeconds = 0;
  let estimatePossible = true;

  for (const type of TYPES) {
    const typeTests    = tests.filter(t => t.interference === type);
    const completed    = typeTests.filter(t => t.completed);
    const withDuration = completed.filter(t => t.duration_seconds != null);
    const remaining    = typeTests.length - completed.length;

    const calcAvg = withDuration.length > 0
      ? withDuration.reduce((s, t) => s + t.duration_seconds, 0) / withDuration.length
      : null;

    const manualValue = getConfig(`avg_time_${type.toLowerCase()}`);

    let avgSeconds = null;
    let avgSource  = null;

    if (manualValue !== null) {
      avgSeconds = parseFloat(manualValue);
      avgSource  = calcAvg !== null ? 'manual_override' : 'manual';
    } else if (calcAvg !== null) {
      avgSeconds = calcAvg;
      avgSource  = 'calculated';
    }

    byType[type] = {
      total:     typeTests.length,
      completed: completed.length,
      remaining,
      avgSeconds,
      avgSource,
    };

    if (remaining > 0) {
      if (avgSeconds !== null) {
        estimatedRemainingSeconds += avgSeconds * remaining;
      } else {
        estimatePossible = false;
      }
    }
  }

  res.json({
    overall,
    devices,
    timing: {
      elapsedSeconds,
      estimatedRemainingSeconds: estimatePossible ? estimatedRemainingSeconds : null,
      byType,
    },
  });
});

module.exports = router;