using System.Text.Json.Nodes;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using SoroushAsadi.Services;

namespace SoroushAsadi.Pages.Admin.Posts;

[Authorize]
public class PostEditModel(ContentService content) : PageModel
{
    [BindProperty(SupportsGet = true)]
    public string Slug { get; set; } = "";

    public string CurrentBody { get; private set; } = "";
    public string Message     { get; private set; } = "";
    public bool   HasOverride { get; private set; }

    // Known default bodies live in Blog/Post.cshtml.cs (DefaultBodies)
    private static readonly Dictionary<string, string> _defaults = new()
    {
        ["rag-eval-framework"]    = SoroushAsadi.Pages.Blog.DefaultBodies.RagEval,
        ["agentic-n8n-patterns"]  = SoroushAsadi.Pages.Blog.DefaultBodies.N8nPatterns,
        ["vertex-cost-control"]   = SoroushAsadi.Pages.Blog.DefaultBodies.VertexCost,
        ["k8s-llm-inference"]     = SoroushAsadi.Pages.Blog.DefaultBodies.K8sInference,
        ["flutter-on-device-ai"]  = SoroushAsadi.Pages.Blog.DefaultBodies.FlutterAI,
        ["enterprise-ai-roadmap"] = SoroushAsadi.Pages.Blog.DefaultBodies.EnterpriseRoadmap,
    };

    public void OnGet()
    {
        var overrides = content.GetPostOverrides();
        if (overrides.TryGetValue(Slug, out var node) && node["body"]?.GetValue<string>() is { } body)
        {
            CurrentBody = body;
            HasOverride = true;
        }
        else
        {
            CurrentBody = _defaults.GetValueOrDefault(Slug, "");
        }
    }

    public IActionResult OnPost(string body, string? reset)
    {
        if (reset == "1")
        {
            // Remove override — default body shows through
            var existing = content.GetPostOverrides();
            existing.Remove(Slug);
            // Rebuild the posts JSON without this slug
            var obj = new JsonObject();
            foreach (var kv in existing) obj[kv.Key] = kv.Value.DeepClone();
            content.SaveSection(ContentService.PostsKey, obj.ToJsonString());

            Message = "Reset to default.";
            HasOverride = false;
            CurrentBody = _defaults.GetValueOrDefault(Slug, "");
            return Page();
        }

        content.SavePost(Slug, new JsonObject { ["body"] = body });
        HasOverride = true;
        CurrentBody = body;
        Message = "Saved.";
        return Page();
    }
}

// Re-export DefaultBodies from the Blog page so this page can use them