using JobsMedical.Web.Data;
using JobsMedical.Web.Models;
using JobsMedical.Web.Services.Scraping;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;

namespace JobsMedical.Web.Pages.Admin;

[Authorize(Roles = "Admin")]
public class IndexModel : PageModel
{
    private readonly AppDbContext _db;
    private readonly IngestionService _ingest;
    private readonly IServiceScopeFactory _scopes;
    private readonly ILogger<IndexModel> _log;

    public IndexModel(AppDbContext db, IngestionService ingest, IServiceScopeFactory scopes, ILogger<IndexModel> log)
    {
        _db = db;
        _ingest = ingest;
        _scopes = scopes;
        _log = log;
    }

    public List<RawListing> Queue { get; private set; } = new();
    public List<RawListing> Flagged { get; private set; } = new();
    public IReadOnlyList<string> SourceNames { get; private set; } = new List<string>();
    public int PublishedShifts { get; private set; }
    public int PublishedJobs { get; private set; }
    public List<IngestionRun> Runs { get; private set; } = new();

    [BindProperty] public string? SourceChannel { get; set; }
    [BindProperty] public string? RawText { get; set; }

    [TempData] public string? IngestMessage { get; set; }

    public async Task OnGetAsync() => await LoadAsync();

    public async Task<IActionResult> OnPostAddAsync()
    {
        if (!string.IsNullOrWhiteSpace(RawText))
        {
            _db.RawListings.Add(new RawListing
            {
                SourceChannel = string.IsNullOrWhiteSpace(SourceChannel) ? "ورود دستی" : SourceChannel.Trim(),
                RawText = RawText.Trim(),
                Status = RawListingStatus.New,
            });
            await _db.SaveChangesAsync();
        }
        return RedirectToPage();
    }

    /// <summary>Fast triage — reject (discard) a queued/flagged item without opening the review page.</summary>
    public async Task<IActionResult> OnPostQuickDiscardAsync(int id)
    {
        var raw = await _db.RawListings.FirstOrDefaultAsync(r => r.Id == id);
        if (raw is not null) { raw.Status = RawListingStatus.Discarded; await _db.SaveChangesAsync(); }
        return RedirectToPage();
    }

    public async Task<IActionResult> OnPostRunIngestionAsync()
    {
        var s = await _ingest.RunAsync();
        IngestMessage = $"جمع‌آوری انجام شد — {s.TotalQueued} در صف، {s.TotalFlagged} پرچم‌خورده، " +
                        $"{s.TotalSpam} اسپم، {s.TotalDuplicates} تکراری.";
        return RedirectToPage();
    }

    /// <summary>
    /// DESTRUCTIVE rebuild, in two distinct deletes:
    ///   1. The DEDUPE CACHE — ALL RawListings, including any added via «افزودن دستی». These are not
    ///      published content; they're the crawl/staging rows whose ContentHash blocks re-ingesting
    ///      the same ad. Wiping them lets everything be re-fetched and re-judged by the AI.
    ///   2. AGGREGATED listings only — Shifts/JobOpenings/TalentListings with Source==Aggregated, i.e.
    ///      produced by ingestion. Employer/admin-posted listings (Source==Direct) are left untouched.
    /// Then re-fetch everything and re-run it through the (now AI-enabled) pipeline.
    /// RawListings are deleted first so their LinkedShift/LinkedTalent FKs (SetNull) don't dangle;
    /// DB cascade clears ContactMethods / Applications / InterestEvents when the posts are deleted.
    /// </summary>
    public async Task<IActionResult> OnPostPurgeAndReingestAsync()
    {
        int rawCount, shifts, jobs, talent;
        await using (var tx = await _db.Database.BeginTransactionAsync())
        {
            rawCount = await _db.RawListings.ExecuteDeleteAsync();                                   // clear dedupe cache
            shifts = await _db.Shifts.Where(s => s.Source == ShiftSource.Aggregated).ExecuteDeleteAsync();
            jobs = await _db.JobOpenings.Where(j => j.Source == ShiftSource.Aggregated).ExecuteDeleteAsync();
            talent = await _db.TalentListings.Where(t => t.Source == ShiftSource.Aggregated).ExecuteDeleteAsync();
            await tx.CommitAsync();
        }

        var s = await _ingest.RunAsync();   // fresh fetch → AI audit → publish/queue
        IngestMessage = $"پاک‌سازی شد (حذف: {rawCount} آیتم کش، {shifts} شیفت، {jobs} استخدام، {talent} آماده‌به‌کارِ جمع‌آوری‌شده). " +
                        $"جمع‌آوری مجدد: {s.TotalPublished} منتشر، {s.TotalQueued} در صف، {s.TotalFlagged} پرچم، {s.TotalSpam} اسپم، {s.TotalDuplicates} تکراری.";
        return RedirectToPage();
    }

    /// <summary>
    /// Clean up EXISTING aggregated content by re-running the current pipeline over the stored raw
    /// text — no re-fetch, so nothing is lost to sources only exposing recent posts. Long-running
    /// (one AI call per item), so it runs on a background scope and returns immediately; the result
    /// shows up as a new row in the «تاریخچهٔ اجرا» log when it finishes.
    /// </summary>
    public IActionResult OnPostReprocessStored()
    {
        _ = Task.Run(async () =>
        {
            using var scope = _scopes.CreateScope();
            var svc = scope.ServiceProvider.GetRequiredService<IngestionService>();
            var log = scope.ServiceProvider.GetRequiredService<ILogger<IndexModel>>();
            try { await svc.ReprocessAsync(); }
            catch (Exception ex) { log.LogError(ex, "Background reprocess failed"); }
        });
        IngestMessage = "پردازش مجدد آیتم‌های ذخیره‌شده در پس‌زمینه آغاز شد. نتیجه پس از اتمام در «تاریخچهٔ اجرا» نمایش داده می‌شود (بسته به تعداد آیتم‌ها و سرعت هوش مصنوعی، چند دقیقه طول می‌کشد).";
        return RedirectToPage();
    }

    private async Task LoadAsync()
    {
        Queue = await _db.RawListings
            .Where(r => r.Status == RawListingStatus.New)
            .OrderByDescending(r => r.Confidence).ThenByDescending(r => r.FetchedAt).ToListAsync();
        Flagged = await _db.RawListings
            .Where(r => r.Status == RawListingStatus.Flagged)
            .OrderByDescending(r => r.FetchedAt).ToListAsync();
        SourceNames = _ingest.SourceNames;
        PublishedShifts = await _db.Shifts.CountAsync(s => s.Source != ShiftSource.Direct);
        PublishedJobs = await _db.JobOpenings.CountAsync();
        Runs = await _db.IngestionRuns.OrderByDescending(r => r.RunAt).Take(15).ToListAsync();
    }
}
