using System;

namespace JobTrackerApi.Services.JobImport.Plugins;

public sealed class FinnPlugin : IJobSitePlugin
{
    public bool CanHandle(string url) => url.Contains("finn.no", StringComparison.OrdinalIgnoreCase);

    public JobImportResult Parse(string html, string url)
    {
        var meta = HtmlExtract.ReadMeta(html);
        var title = meta.TryGetValue("og:title", out var t) ? t : HtmlExtract.ReadTitle(html);
        var desc = meta.TryGetValue("og:description", out var d) ? d : null;
        var company = ExtractCompanyFromTitle(title);

        return new JobImportResult
        {
            SourceUrl = url,
            Title = CleanTitle(title),
            Company = company,
            Location = meta.TryGetValue("job:location", out var loc) ? loc : null,
            Description = HtmlExtract.ToPlainText(desc),
            Parser = "finn",
            Success = !string.IsNullOrWhiteSpace(title) && !string.IsNullOrWhiteSpace(desc),
        };
    }

    private static string? CleanTitle(string? title)
    {
        if (string.IsNullOrWhiteSpace(title)) return null;
        // FINN often appends " - FINN.no" etc.
        var s = title.Replace(" - FINN.no", "", StringComparison.OrdinalIgnoreCase).Trim();
        return s.Length == 0 ? title : s;
    }

    private static string? ExtractCompanyFromTitle(string? title)
    {
        if (string.IsNullOrWhiteSpace(title)) return null;
        // Common pattern: "Role hos Company" / "Role - Company"
        var s = title;
        var idx = s.LastIndexOf(" - ", StringComparison.Ordinal);
        if (idx > 0 && idx < s.Length - 3) return s[(idx + 3)..].Trim();
        idx = s.LastIndexOf(" hos ", StringComparison.OrdinalIgnoreCase);
        if (idx > 0 && idx < s.Length - 5) return s[(idx + 5)..].Trim();
        return null;
    }
}