/**
 * save-testcases.js
 *
 * Writes an array of legacy-shaped testcases back to the individual YAML files.
 * Tries to preserve existing per-step automation flags and custom data.
 *
 * This is part of the transition so that the editor can save directly to YAML.
 */

const fs = require('fs');
const path = require('path');
const yaml = require('js-yaml');

const TESTCASES_ROOT = path.join(__dirname, '..', '..', 'testcases');

function getYamlPath(legacyTest) {
  const project = 'pbx'; // transition: all current data lives under pbx project
  const module = legacyTest.module || 'unknown';
  const rawGroup = legacyTest.group || 'unknown';
  const group = rawGroup.replace(/^core-|^pbx-/, '');
  return path.join(TESTCASES_ROOT, project, module, group, `${legacyTest.id}.yaml`);
}

function buildCanonicalDoc(legacy, existing = {}) {
  const cf = legacy.custom_fields || existing.custom_fields || {};

  // Support rich steps from new per-step editor (Fase B+)
  let steps = [];
  const incomingSteps = legacy.steps || [];

  if (incomingSteps.length > 0 && typeof incomingSteps[0] === 'object' && incomingSteps[0] !== null) {
    // Rich steps sent from frontend
    steps = incomingSteps.map(s => ({
      action: s.action || '',
      expected: s.expected || '',
      automatable: s.automatable !== undefined ? !!s.automatable : (legacy.status !== 'manual'),
      ...(s.reason_not_automatable ? { reason_not_automatable: s.reason_not_automatable } : {})
    }));
  } else {
    // Legacy flat strings
    steps = incomingSteps.map((action, i) => {
      const prev = (existing.steps && existing.steps[i]) || {};
      return {
        action: action,
        expected: prev.expected || '',
        automatable: prev.automatable !== undefined ? prev.automatable : (legacy.status !== 'manual'),
        ...(prev.reason_not_automatable ? { reason_not_automatable: prev.reason_not_automatable } : {})
      };
    });
  }

  // If existing had more detailed steps, prefer their automatable flags
  if (existing.steps && existing.steps.length === steps.length) {
    steps = existing.steps.map((prev, i) => ({
      ...prev,
      action: steps[i].action
    }));
  }

  const doc = {
    id: legacy.id,
    project: 'pbx',
    module: legacy.module,
    group: legacy.group,
    title: legacy.description || legacy.title,
    description: legacy.description || legacy.title,
    priority: existing.priority || 'Medium',
    tags: existing.tags || [],
    references: existing.references || [],
    dependencies: legacy.dependencies || existing.dependencies || [],
    preconditions: existing.preconditions || [],
    postconditions: existing.postconditions || [],
    steps,
    automation_status: legacy.status,
    file: legacy.file || existing.file || null,
    custom_fields: {
      ...cf,
      original_action: legacy.action,
    }
  };

  // Carry over extra legacy fields the UI might send
  if (legacy.manualReason) doc.custom_fields.manualReason = legacy.manualReason;
  if (legacy.partialNotes) doc.custom_fields.partialNotes = legacy.partialNotes;

  return doc;
}

function saveTestcases(legacyArray) {
  for (const test of legacyArray) {
    if (!test || !test.id) continue;

    const filePath = getYamlPath(test);
    const dir = path.dirname(filePath);

    if (!fs.existsSync(dir)) {
      fs.mkdirSync(dir, { recursive: true });
    }

    let existing = {};
    if (fs.existsSync(filePath)) {
      try {
        const raw = fs.readFileSync(filePath, 'utf8');
        existing = yaml.load(raw) || {};
      } catch (e) {
        // ignore, we'll overwrite
      }
    }

    const doc = buildCanonicalDoc(test, existing);
    const header = `# Updated via Autotest Editor - ${new Date().toISOString()}\n# Source of truth: this YAML file\n\n`;
    const content = header + yaml.dump(doc, { lineWidth: 100, noRefs: true });

    fs.writeFileSync(filePath, content, 'utf8');
  }
}

module.exports = { saveTestcases, getYamlPath };