cesnimda
436 lines
22 KiB
C#
436 lines
22 KiB
C#
using System.Text.Json;
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using System.Text.RegularExpressions;
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using JobTrackerApi.Models;
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namespace JobTrackerApi.Services;
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// Phase 2.1-a — the diff half of the review-and-merge workflow. Pure comparison of the user's current
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// Career Profile against a freshly-extracted profile; produces structured, user-facing changes. It
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// applies NOTHING — the merge engine consumes an accepted diff separately. No DB, no AI, no state.
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//
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// Conservative by design (the approved policy): items match only when they clearly refer to the same
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// thing (company+title, institution+qualification, project/certification name, language/skill text),
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// a field is only ever proposed as an *update* when the extracted value is non-empty and differs, and
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// nothing the user already has is ever marked for deletion.
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public enum CvChangeKind { Add, Update }
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public sealed record CvFieldChange(string Field, string? OldValue, string? NewValue);
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public sealed class CvItemChange
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{
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public string Id { get; init; } = "";
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public CvChangeKind Kind { get; init; }
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public string Category { get; init; } = "";
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public string Label { get; init; } = "";
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public string Confidence { get; init; } = "Medium"; // High | Medium | Low
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public List<CvFieldChange> FieldChanges { get; init; } = new();
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}
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public sealed class CvCategoryDiff
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{
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public string Category { get; init; } = "";
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public List<CvItemChange> Added { get; init; } = new();
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public List<CvItemChange> Updated { get; init; } = new();
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public int UnchangedCount { get; init; }
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public int LowConfidenceCount => Added.Concat(Updated).Count(c => c.Confidence == "Low");
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}
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public sealed class CvImportDiff
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{
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public List<CvCategoryDiff> Categories { get; init; } = new();
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public int TotalAdded => Categories.Sum(c => c.Added.Count);
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public int TotalUpdated => Categories.Sum(c => c.Updated.Count);
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public int TotalLowConfidence => Categories.Sum(c => c.LowConfidenceCount);
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public bool HasChanges => TotalAdded > 0 || TotalUpdated > 0;
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}
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public interface ICvProfileDiffService
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{
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CvImportDiff Diff(StructuredCvProfile current, StructuredCvProfile extracted);
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StructuredCvProfile Merge(StructuredCvProfile current, StructuredCvProfile extracted, IReadOnlySet<string>? acceptedLowConfidenceIds = null);
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}
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public sealed class CvProfileDiffService : ICvProfileDiffService
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{
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public CvImportDiff Diff(StructuredCvProfile current, StructuredCvProfile extracted)
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{
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current ??= new StructuredCvProfile();
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extracted ??= new StructuredCvProfile();
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return new CvImportDiff
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{
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Categories = new List<CvCategoryDiff>
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{
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DiffContact(current.Contact, extracted.Contact),
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DiffSummary(current.Summary, extracted.Summary),
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DiffList("Experience", current.Jobs, extracted.Jobs, JobKey, JobLabel, JobFields, JobConfidence),
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DiffList("Education", current.Education, extracted.Education, EduKey, EduLabel, EduFields, EduConfidence),
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DiffList("Projects", current.Projects, extracted.Projects, p => Norm(p.Name), p => p.Name ?? "Project", ProjectFields, p => Confidence(p.Name, p.Bullets.Count > 0)),
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DiffList("Certifications", current.Certifications, extracted.Certifications, c => Norm(c.Name), c => c.Name ?? "Certification", CertFields, c => Confidence(c.Name, !string.IsNullOrWhiteSpace(c.Issuer))),
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DiffLanguages(current.Languages, extracted.Languages),
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DiffScalars("Skills", current.Skills, extracted.Skills),
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DiffScalars("Interests", current.Interests, extracted.Interests),
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DiffScalars("Awards", current.Awards, extracted.Awards),
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DiffScalars("Publications", current.Publications, extracted.Publications),
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DiffScalars("Organisations", current.Organisations, extracted.Organisations),
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DiffScalars("References", current.References, extracted.References),
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}.Where(c => c is not null).Select(c => c!).ToList(),
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};
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}
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public StructuredCvProfile Merge(StructuredCvProfile current, StructuredCvProfile extracted, IReadOnlySet<string>? acceptedLowConfidenceIds = null)
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{
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var merged = StructuredCvProfileJson.Deserialize(StructuredCvProfileJson.Serialize(current ?? new StructuredCvProfile()));
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extracted = FilterLowConfidence(extracted ?? new StructuredCvProfile(), acceptedLowConfidenceIds);
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MergeContact(merged.Contact, extracted.Contact);
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if (extracted.Summary.Any(x => !string.IsNullOrWhiteSpace(x))) merged.Summary = extracted.Summary.Where(x => !string.IsNullOrWhiteSpace(x)).ToList();
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MergeList(merged.Jobs, extracted.Jobs, JobKey, MergeJob);
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MergeList(merged.Education, extracted.Education, EduKey, MergeEducation);
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MergeList(merged.Projects, extracted.Projects, p => Norm(p.Name), MergeProject);
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MergeList(merged.Certifications, extracted.Certifications, c => Norm(c.Name), MergeCertification);
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MergeLanguages(merged.Languages, extracted.Languages);
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AppendUnique(merged.Skills, extracted.Skills);
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AppendUnique(merged.Interests, extracted.Interests);
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AppendUnique(merged.Awards, extracted.Awards);
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AppendUnique(merged.Publications, extracted.Publications);
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AppendUnique(merged.Organisations, extracted.Organisations);
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AppendUnique(merged.References, extracted.References);
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MergeList(merged.OtherSections, extracted.OtherSections, x => Norm(x.Title), (a, b) => AppendUnique(a.Items, b.Items));
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if (extracted.Sections.Count > 0) merged.Sections = extracted.Sections;
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foreach (var field in extracted.Metadata.Fields) merged.Metadata.Fields[field.Key] = field.Value;
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return merged;
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}
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private static StructuredCvProfile FilterLowConfidence(StructuredCvProfile source, IReadOnlySet<string>? accepted)
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{
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var filtered = JsonSerializer.Deserialize<StructuredCvProfile>(JsonSerializer.Serialize(source)) ?? new StructuredCvProfile();
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bool Allowed(string category, string key, string confidence) => confidence != "Low" || (accepted?.Contains(ChangeId(category, key)) ?? false);
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if (!Allowed("Contact", string.Empty, Confidence(filtered.Contact.FullName, !string.IsNullOrWhiteSpace(filtered.Contact.Email)))) filtered.Contact = new StructuredCvContact();
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filtered.Jobs = filtered.Jobs.Where(x => Allowed("Experience", JobKey(x), JobConfidence(x))).ToList();
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filtered.Education = filtered.Education.Where(x => Allowed("Education", EduKey(x), EduConfidence(x))).ToList();
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filtered.Projects = filtered.Projects.Where(x => Allowed("Projects", Norm(x.Name), Confidence(x.Name, x.Bullets.Count > 0))).ToList();
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filtered.Certifications = filtered.Certifications.Where(x => Allowed("Certifications", Norm(x.Name), Confidence(x.Name, !string.IsNullOrWhiteSpace(x.Issuer)))).ToList();
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filtered.Languages = filtered.Languages.Where(x => Allowed("Languages", Norm(x.Name), string.IsNullOrWhiteSpace(x.Level) ? "Low" : "High")).ToList();
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return filtered;
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}
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private static void MergeList<T>(List<T> current, IEnumerable<T> extracted, Func<T, string> key, Action<T, T> merge)
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{
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var currentByKey = current.Where(x => key(x).Length > 0).GroupBy(key).ToDictionary(g => g.Key, g => g.First());
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foreach (var incoming in extracted)
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{
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var k = key(incoming);
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if (k.Length > 0 && currentByKey.TryGetValue(k, out var existing)) merge(existing, incoming);
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else if (k.Length > 0 && !currentByKey.ContainsKey(k))
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{
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current.Add(incoming);
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currentByKey[k] = incoming;
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}
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}
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}
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private static void MergeContact(StructuredCvContact current, StructuredCvContact incoming)
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{
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SetIfPresent(incoming.FullName, v => current.FullName = v);
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SetIfPresent(incoming.Headline, v => current.Headline = v);
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SetIfPresent(incoming.Email, v => current.Email = v);
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SetIfPresent(incoming.Phone, v => current.Phone = v);
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SetIfPresent(incoming.Location, v => current.Location = v);
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SetIfPresent(incoming.Website, v => current.Website = v);
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SetIfPresent(incoming.LinkedIn, v => current.LinkedIn = v);
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}
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private static void MergeJob(StructuredCvJob current, StructuredCvJob incoming)
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{
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SetIfPresent(incoming.Location, v => current.Location = v);
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SetIfPresent(incoming.Start, v => current.Start = v);
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SetIfPresent(incoming.End, v => current.End = v);
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current.IsCurrent = incoming.IsCurrent || current.IsCurrent;
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AppendUnique(current.Bullets, incoming.Bullets);
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AppendUnique(current.Skills, incoming.Skills);
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}
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private static void MergeEducation(StructuredCvEducation current, StructuredCvEducation incoming)
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{
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SetIfPresent(incoming.QualificationLevel, v => current.QualificationLevel = v);
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SetIfPresent(incoming.Location, v => current.Location = v);
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SetIfPresent(incoming.Start, v => current.Start = v);
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SetIfPresent(incoming.End, v => current.End = v);
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AppendUnique(current.Details, incoming.Details);
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}
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private static void MergeProject(StructuredCvProject current, StructuredCvProject incoming)
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{
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SetIfPresent(incoming.Role, v => current.Role = v);
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SetIfPresent(incoming.Location, v => current.Location = v);
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SetIfPresent(incoming.Start, v => current.Start = v);
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SetIfPresent(incoming.End, v => current.End = v);
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AppendUnique(current.Bullets, incoming.Bullets);
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AppendUnique(current.Skills, incoming.Skills);
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}
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private static void MergeCertification(StructuredCvCertification current, StructuredCvCertification incoming)
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{
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SetIfPresent(incoming.Issuer, v => current.Issuer = v);
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SetIfPresent(incoming.Location, v => current.Location = v);
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SetIfPresent(incoming.Date, v => current.Date = v);
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AppendUnique(current.Details, incoming.Details);
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}
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private static void MergeLanguages(List<StructuredCvLanguage> current, IEnumerable<StructuredCvLanguage> extracted)
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{
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var currentByName = current.Where(x => !string.IsNullOrWhiteSpace(x.Name)).GroupBy(x => Norm(x.Name)).ToDictionary(g => g.Key, g => g.First());
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foreach (var incoming in extracted.Where(x => !string.IsNullOrWhiteSpace(x.Name)))
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{
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var k = Norm(incoming.Name);
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if (currentByName.TryGetValue(k, out var existing))
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{
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SetIfPresent(incoming.Level, v => existing.Level = v);
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SetIfPresent(incoming.Notes, v => existing.Notes = v);
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}
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else
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{
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current.Add(incoming);
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currentByName[k] = incoming;
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}
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}
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}
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private static void AppendUnique(List<string> current, IEnumerable<string> incoming)
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{
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var seen = new HashSet<string>(current.Select(Norm).Where(x => x.Length > 0));
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foreach (var value in incoming.Where(x => !string.IsNullOrWhiteSpace(x)))
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if (seen.Add(Norm(value))) current.Add(value.Trim());
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}
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private static void SetIfPresent(string? value, Action<string> set)
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{
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if (!string.IsNullOrWhiteSpace(value)) set(value.Trim());
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}
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// ---- list diff (Experience / Education / Projects / Certifications) --------------------------
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private static CvCategoryDiff DiffList<T>(
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string category,
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List<T> current,
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List<T> extracted,
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Func<T, string> key,
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Func<T, string> label,
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Func<T, T, List<CvFieldChange>> fieldChanges,
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Func<T, string> confidence)
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{
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var currentByKey = new Dictionary<string, T>();
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foreach (var item in current)
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{
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var k = key(item);
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if (!string.IsNullOrEmpty(k)) currentByKey[k] = item;
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}
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var added = new List<CvItemChange>();
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var updated = new List<CvItemChange>();
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var unchanged = 0;
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foreach (var item in extracted)
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{
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var k = key(item);
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if (!string.IsNullOrEmpty(k) && currentByKey.TryGetValue(k, out var existing))
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{
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var changes = fieldChanges(existing, item);
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if (changes.Count > 0)
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updated.Add(new CvItemChange { Id = ChangeId(category, k), Kind = CvChangeKind.Update, Category = category, Label = label(item), Confidence = confidence(item), FieldChanges = changes });
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else
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unchanged++;
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}
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else
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{
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added.Add(new CvItemChange { Id = ChangeId(category, k), Kind = CvChangeKind.Add, Category = category, Label = label(item), Confidence = confidence(item) });
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}
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}
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return new CvCategoryDiff { Category = category, Added = added, Updated = updated, UnchangedCount = unchanged };
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}
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// ---- contact (field-level) ------------------------------------------------------------------
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private static CvCategoryDiff DiffContact(StructuredCvContact current, StructuredCvContact extracted)
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{
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var fields = new List<CvFieldChange>();
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void Compare(string name, string? oldV, string? newV)
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{
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if (!string.IsNullOrWhiteSpace(newV) && !ValuesEqual(oldV, newV))
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fields.Add(new CvFieldChange(name, oldV, newV));
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}
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Compare("Full name", current.FullName, extracted.FullName);
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Compare("Headline", current.Headline, extracted.Headline);
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Compare("Email", current.Email, extracted.Email);
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Compare("Phone", current.Phone, extracted.Phone);
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Compare("Location", current.Location, extracted.Location);
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Compare("Website", current.Website, extracted.Website);
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Compare("LinkedIn", current.LinkedIn, extracted.LinkedIn);
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var isNew = string.IsNullOrWhiteSpace(current.FullName) && string.IsNullOrWhiteSpace(current.Email);
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var changes = new List<CvItemChange>();
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var added = new List<CvItemChange>();
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var updated = new List<CvItemChange>();
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if (fields.Count > 0)
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{
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var change = new CvItemChange
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{
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Id = "Contact",
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Kind = isNew ? CvChangeKind.Add : CvChangeKind.Update,
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Category = "Contact",
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Label = extracted.FullName ?? "Contact details",
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Confidence = Confidence(extracted.FullName, !string.IsNullOrWhiteSpace(extracted.Email)),
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FieldChanges = fields,
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};
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(isNew ? added : updated).Add(change);
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}
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return new CvCategoryDiff { Category = "Contact", Added = added, Updated = updated };
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}
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private static CvCategoryDiff DiffSummary(List<string> current, List<string> extracted)
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{
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var cur = JoinLines(current);
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var ext = JoinLines(extracted);
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var added = new List<CvItemChange>();
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var updated = new List<CvItemChange>();
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if (!string.IsNullOrWhiteSpace(ext) && !ValuesEqual(cur, ext))
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{
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var change = new CvItemChange
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{
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Id = "Professional summary",
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Kind = string.IsNullOrWhiteSpace(cur) ? CvChangeKind.Add : CvChangeKind.Update,
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Category = "Professional summary",
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Label = "Professional summary",
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Confidence = "Medium",
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FieldChanges = new List<CvFieldChange> { new("Summary", Trunc(cur), Trunc(ext)) },
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};
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(string.IsNullOrWhiteSpace(cur) ? added : updated).Add(change);
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}
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return new CvCategoryDiff { Category = "Professional summary", Added = added, Updated = updated };
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}
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// ---- languages & skills (scalar-ish, dedup by normalized name) -------------------------------
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private static CvCategoryDiff DiffLanguages(List<StructuredCvLanguage> current, List<StructuredCvLanguage> extracted)
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{
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var currentByName = current.Where(l => !string.IsNullOrWhiteSpace(l.Name)).ToDictionary(l => Norm(l.Name), l => l);
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var added = new List<CvItemChange>();
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var updated = new List<CvItemChange>();
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var unchanged = 0;
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foreach (var lang in extracted)
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{
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if (string.IsNullOrWhiteSpace(lang.Name)) continue;
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var k = Norm(lang.Name);
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if (currentByName.TryGetValue(k, out var existing))
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{
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if (!string.IsNullOrWhiteSpace(lang.Level) && !ValuesEqual(existing.Level, lang.Level))
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updated.Add(new CvItemChange { Id = ChangeId("Languages", k), Kind = CvChangeKind.Update, Category = "Languages", Label = lang.Name!, Confidence = "Medium", FieldChanges = new List<CvFieldChange> { new("Level", existing.Level, lang.Level) } });
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else
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unchanged++;
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}
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else
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{
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added.Add(new CvItemChange { Id = ChangeId("Languages", k), Kind = CvChangeKind.Add, Category = "Languages", Label = string.IsNullOrWhiteSpace(lang.Level) ? lang.Name! : $"{lang.Name} ({lang.Level})", Confidence = string.IsNullOrWhiteSpace(lang.Level) ? "Low" : "High" });
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}
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}
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return new CvCategoryDiff { Category = "Languages", Added = added, Updated = updated, UnchangedCount = unchanged };
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}
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private static CvCategoryDiff DiffScalars(string category, List<string> current, List<string> extracted)
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{
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var currentSet = new HashSet<string>(current.Select(Norm).Where(s => s.Length > 0));
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var added = new List<CvItemChange>();
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var seen = new HashSet<string>();
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foreach (var item in extracted)
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{
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var k = Norm(item);
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if (k.Length == 0 || !seen.Add(k)) continue;
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if (!currentSet.Contains(k))
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added.Add(new CvItemChange { Id = ChangeId(category, k), Kind = CvChangeKind.Add, Category = category, Label = item.Trim(), Confidence = "High" });
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}
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return new CvCategoryDiff { Category = category, Added = added, UnchangedCount = currentSet.Count };
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}
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// ---- keys / labels / field comparisons -------------------------------------------------------
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private static string JobKey(StructuredCvJob j) => $"{Norm(j.Company)}|{Norm(j.Title)}";
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private static string JobLabel(StructuredCvJob j) => string.Join(" — ", new[] { j.Title, j.Company }.Where(v => !string.IsNullOrWhiteSpace(v)));
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private static List<CvFieldChange> JobFields(StructuredCvJob a, StructuredCvJob b)
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{
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var f = new List<CvFieldChange>();
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AddIf(f, "Dates", DateRange(a.Start, a.End), DateRange(b.Start, b.End));
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AddIf(f, "Location", a.Location, b.Location);
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if (b.Bullets.Count > 0 && !ValuesEqual(JoinLines(a.Bullets), JoinLines(b.Bullets)))
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f.Add(new CvFieldChange("Bullets", $"{a.Bullets.Count} line(s)", $"{b.Bullets.Count} line(s)"));
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return f;
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}
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private static string JobConfidence(StructuredCvJob j) => Confidence(j.Title, !string.IsNullOrWhiteSpace(j.Company) && (!string.IsNullOrWhiteSpace(j.Start) || j.Bullets.Count > 0));
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private static string EduKey(StructuredCvEducation e) => $"{Norm(e.Institution)}|{Norm(e.Qualification)}";
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private static string EduLabel(StructuredCvEducation e) => string.Join(" — ", new[] { e.Qualification, e.Institution }.Where(v => !string.IsNullOrWhiteSpace(v)));
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private static List<CvFieldChange> EduFields(StructuredCvEducation a, StructuredCvEducation b)
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{
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var f = new List<CvFieldChange>();
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AddIf(f, "Dates", DateRange(a.Start, a.End), DateRange(b.Start, b.End));
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AddIf(f, "Location", a.Location, b.Location);
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return f;
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}
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private static string EduConfidence(StructuredCvEducation e) => Confidence(e.Qualification, !string.IsNullOrWhiteSpace(e.Institution));
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private static List<CvFieldChange> ProjectFields(StructuredCvProject a, StructuredCvProject b)
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{
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var f = new List<CvFieldChange>();
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if (b.Bullets.Count > 0 && !ValuesEqual(JoinLines(a.Bullets), JoinLines(b.Bullets)))
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f.Add(new CvFieldChange("Details", $"{a.Bullets.Count} line(s)", $"{b.Bullets.Count} line(s)"));
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return f;
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}
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private static List<CvFieldChange> CertFields(StructuredCvCertification a, StructuredCvCertification b)
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{
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var f = new List<CvFieldChange>();
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AddIf(f, "Issuer", a.Issuer, b.Issuer);
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AddIf(f, "Date", a.Date, b.Date);
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return f;
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}
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// ---- helpers --------------------------------------------------------------------------------
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private static string ChangeId(string category, string key) => key.Length == 0 ? category : $"{category}|{key}";
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private static void AddIf(List<CvFieldChange> f, string name, string? oldV, string? newV)
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{
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if (!string.IsNullOrWhiteSpace(newV) && !ValuesEqual(oldV, newV))
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f.Add(new CvFieldChange(name, oldV, newV));
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}
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private static string Confidence(string? primary, bool corroborated)
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{
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if (string.IsNullOrWhiteSpace(primary)) return "Low";
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return corroborated ? "High" : "Medium";
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}
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private static string DateRange(string? start, string? end)
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{
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var s = (start ?? "").Trim();
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var e = (end ?? "").Trim();
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if (s.Length == 0 && e.Length == 0) return "";
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return $"{s} - {e}".Trim(' ', '-');
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}
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private static bool ValuesEqual(string? a, string? b) => Norm(a) == Norm(b);
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private static string Norm(string? value)
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{
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if (string.IsNullOrWhiteSpace(value)) return "";
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var lowered = value.Trim().ToLowerInvariant();
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return Regex.Replace(lowered, @"[^\p{L}\p{Nd}]+", " ").Trim();
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}
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private static string JoinLines(IEnumerable<string> lines) => string.Join("\n", lines.Where(l => !string.IsNullOrWhiteSpace(l)).Select(l => l.Trim()));
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private static string Trunc(string? s, int max = 140) => string.IsNullOrEmpty(s) ? "" : (s.Length <= max ? s : s[..max] + "…");
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}
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