using System;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;
using Gott.Extensions;
using Gott.Models;
using Gott.Services;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;

namespace Gott.Endpoints;

public static class ApiKeysEndpoint
{
    public static void MapApiKeysEndpoints(this WebApplication app)
    {
        app.MapGet("/api/admin/api-keys", HandleGetAll);
        app.MapPost("/api/admin/api-keys", HandleCreate);
        app.MapPut("/api/admin/api-keys/{keyId}", HandleUpdate);
        app.MapPut("/api/admin/api-keys/{keyId}/activate", HandleActivate);
        app.MapPut("/api/admin/api-keys/{keyId}/deactivate", HandleDeactivate);
        app.MapDelete("/api/admin/api-keys/{keyId}", HandleDelete);
    }

    private static async Task HandleGetAll(HttpContext ctx, DatabaseService db)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        var keys = await db.GetApiKeys();
        var result = keys.Select(k => new
        {
            k.KeyId,
            k.Provider,
            k.Name,
            k.ApiKey,
            k.IsActive,
            k.CreatedAt,
            k.UpdatedAt
        });
        await ctx.Response.WriteAsJsonAsync(result);
    }

    private static async Task HandleCreate(HttpContext ctx, DatabaseService db)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        var body = await JsonSerializer.DeserializeAsync<JsonElement>(ctx.Request.Body);
        var provider = body.GetProperty("provider").GetString()?.Trim().ToLower() ?? "";
        var name = body.GetProperty("name").GetString()?.Trim() ?? "";
        var apiKey = body.GetProperty("apiKey").GetString()?.Trim() ?? "";

        if (string.IsNullOrWhiteSpace(provider) || string.IsNullOrWhiteSpace(name) || string.IsNullOrWhiteSpace(apiKey))
        {
            ctx.Response.StatusCode = 400;
            await ctx.Response.WriteAsJsonAsync(new { error = "Provider, Name und API-Key sind erforderlich" });
            return;
        }

        var now = DateTime.UtcNow.ToString("o");
        var record = new ApiKeyRecord
        {
            KeyId = Guid.NewGuid().ToString("N"),
            Provider = provider,
            Name = name,
            ApiKey = apiKey,
            IsActive = false,
            CreatedAt = now,
            UpdatedAt = now
        };

        await db.CreateApiKey(record);
        await ctx.Response.WriteAsJsonAsync(new
        {
            record.KeyId,
            record.Provider,
            record.Name,
            record.ApiKey,
            record.IsActive,
            record.CreatedAt
        });
    }

    private static async Task HandleUpdate(HttpContext ctx, DatabaseService db, AnthropicService anthropic, string keyId)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        var existing = await db.GetApiKey(keyId);
        if (existing == null)
        {
            ctx.Response.StatusCode = 404;
            await ctx.Response.WriteAsJsonAsync(new { error = "Key nicht gefunden" });
            return;
        }

        var body = await JsonSerializer.DeserializeAsync<JsonElement>(ctx.Request.Body);
        var name = body.TryGetProperty("name", out var n) ? n.GetString()?.Trim() : null;
        var apiKey = body.TryGetProperty("apiKey", out var k) ? k.GetString()?.Trim() : null;

        if (string.IsNullOrWhiteSpace(name))
            name = existing.Name;

        await db.UpdateApiKey(keyId, name, apiKey);

        // Wenn aktiver Key geändert wird → Token im Service aktualisieren
        if (existing.IsActive && existing.Provider == "anthropic" && !string.IsNullOrWhiteSpace(apiKey))
            anthropic.UpdateToken(apiKey);

        await ctx.Response.WriteAsJsonAsync(new { ok = true });
    }

    private static async Task HandleActivate(HttpContext ctx, DatabaseService db, AnthropicService anthropic, string keyId)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        var existing = await db.GetApiKey(keyId);
        if (existing == null)
        {
            ctx.Response.StatusCode = 404;
            await ctx.Response.WriteAsJsonAsync(new { error = "Key nicht gefunden" });
            return;
        }

        await db.SetActiveApiKey(keyId, existing.Provider);

        // Token im laufenden Service aktualisieren
        if (existing.Provider == "anthropic")
            anthropic.UpdateToken(existing.ApiKey);

        await ctx.Response.WriteAsJsonAsync(new { ok = true });
    }

    private static async Task HandleDeactivate(HttpContext ctx, DatabaseService db, AnthropicService anthropic, string keyId)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        var existing = await db.GetApiKey(keyId);
        if (existing == null)
        {
            ctx.Response.StatusCode = 404;
            await ctx.Response.WriteAsJsonAsync(new { error = "Key nicht gefunden" });
            return;
        }

        await db.DeactivateApiKey(keyId);

        // Token im laufenden Service leeren
        if (existing.Provider == "anthropic")
            anthropic.UpdateToken("");

        await ctx.Response.WriteAsJsonAsync(new { ok = true });
    }

    private static async Task HandleDelete(HttpContext ctx, DatabaseService db, AnthropicService anthropic, string keyId)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        var existing = await db.GetApiKey(keyId);
        if (existing == null)
        {
            ctx.Response.StatusCode = 404;
            await ctx.Response.WriteAsJsonAsync(new { error = "Key nicht gefunden" });
            return;
        }

        // Wenn aktiver Key gelöscht wird → Token leeren
        if (existing.IsActive && existing.Provider == "anthropic")
            anthropic.UpdateToken("");

        await db.DeleteApiKey(keyId);
        await ctx.Response.WriteAsJsonAsync(new { ok = true });
    }


}