using System;
using System.Linq;
using System.Net.Http;
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);
        app.MapPost("/api/admin/api-keys/{keyId}/check", HandleCheck);

        // Scan-Endpoints
        app.MapPost("/api/admin/api-keys/scan", HandleScanTrigger);
        app.MapGet("/api/admin/api-keys/scan/status", HandleScanStatus);
        app.MapGet("/api/admin/api-keys/scanned", HandleGetScanned);
        app.MapPost("/api/admin/api-keys/scanned/{id}/recheck", HandleRecheck);
        app.MapPost("/api/admin/api-keys/scanned/{id}/adopt", HandleAdopt);
        app.MapDelete("/api/admin/api-keys/scanned/{id}", HandleDeleteScanned);
    }

    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.Status,
            k.Plan,
            k.Usage7d,
            k.Usage5h,
            k.CheckedAt,
            k.SourceUrl,
            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 });
    }

    private static async Task HandleCheck(HttpContext ctx, IHttpClientFactory httpFactory, DatabaseService db, 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;
        }

        if (existing.Provider != "anthropic")
        {
            ctx.Response.StatusCode = 400;
            await ctx.Response.WriteAsJsonAsync(new { error = "Check nur für Anthropic-Keys verfügbar" });
            return;
        }

        var result = await AnthropicKeyChecker.CheckKeyAsync(httpFactory, existing.ApiKey);
        var dbStatus = (result.Status == "ok" || result.Status == "usage_limited") ? "valid" : result.Status;

        // Metadaten in DB speichern
        await db.UpdateApiKeyMeta(keyId, dbStatus, result.Plan, result.Usage7d, result.Usage5h);

        await ctx.Response.WriteAsJsonAsync(new
        {
            status = dbStatus,
            message = result.Message,
            plan = result.Plan,
            result.IsSubscription,
            result.Usage7d,
            result.Usage5h,
            result.Overage,
            status7d = result.Status7d,
            status5h = result.Status5h,
            statusOverage = result.StatusOverage
        });
    }

    // ── Scan-Endpoints ──

    private static Task HandleScanTrigger(HttpContext ctx, KeyScannerService scanner)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return Task.CompletedTask; }

        if (scanner.IsRunning)
        {
            ctx.Response.StatusCode = 409;
            return ctx.Response.WriteAsJsonAsync(new { error = "Scan läuft bereits" });
        }

        scanner.TriggerScan();
        return ctx.Response.WriteAsJsonAsync(new { ok = true, message = "Scan gestartet" });
    }

    private static Task HandleScanStatus(HttpContext ctx, KeyScannerService scanner)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return Task.CompletedTask; }

        return ctx.Response.WriteAsJsonAsync(new
        {
            running = scanner.IsRunning,
            lastRun = scanner.LastRun,
            lastResult = scanner.LastResult
        });
    }

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

        var keys = await db.GetScannedKeys();
        var result = keys.Select(k => new
        {
            k.ScannedKeyId,
            k.Source,
            k.Type,
            k.SourceUrl,
            k.Status,
            k.Plan,
            k.Usage7d,
            k.Usage5h,
            k.ScannedAt,
            k.CheckedAt,
            k.AdoptedApiKeyId
        });
        await ctx.Response.WriteAsJsonAsync(result);
    }

    private static async Task HandleRecheck(HttpContext ctx, DatabaseService db, KeyScannerService scanner, string id)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

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

        await scanner.CheckAndUpdateKey(sk);
        var updated = await db.GetScannedKey(id);
        await ctx.Response.WriteAsJsonAsync(new
        {
            ok = true,
            updated.Status,
            updated.Plan,
            updated.Usage7d,
            updated.Usage5h,
            updated.CheckedAt
        });
    }

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

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

        if (sk.AdoptedApiKeyId != null)
        {
            ctx.Response.StatusCode = 409;
            await ctx.Response.WriteAsJsonAsync(new { error = "Key wurde bereits übernommen" });
            return;
        }

        // Prüfen ob Key schon als API-Key existiert
        if (await db.ApiKeyExistsInKeys(sk.ApiKey))
        {
            ctx.Response.StatusCode = 409;
            await ctx.Response.WriteAsJsonAsync(new { error = "Key existiert bereits als API-Key" });
            return;
        }

        // Name: user/repo aus URL extrahieren, SourceUrl: vollständige URL
        var sourceUrl = !string.IsNullOrWhiteSpace(sk.SourceUrl) ? sk.SourceUrl : null;
        var title = $"Scan: {sk.Plan ?? "Unknown"}";
        if (sourceUrl != null)
        {
            var path = sourceUrl.Replace("https://github.com/", "");
            var parts = path.Split('/');
            if (parts.Length >= 2)
                title = parts[0] + "/" + parts[1];
        }

        var now = DateTime.UtcNow.ToString("o");
        var record = new ApiKeyRecord
        {
            KeyId = Guid.NewGuid().ToString("N"),
            Provider = "anthropic",
            Name = title,
            ApiKey = sk.ApiKey,
            IsActive = false,
            Status = sk.Status,
            Plan = sk.Plan,
            Usage7d = sk.Usage7d,
            Usage5h = sk.Usage5h,
            CheckedAt = sk.CheckedAt,
            SourceUrl = sourceUrl,
            CreatedAt = now,
            UpdatedAt = now
        };

        var apiKeyId = await db.CreateApiKey(record);
        await db.SetScannedKeyAdopted(id, apiKeyId);

        await ctx.Response.WriteAsJsonAsync(new { ok = true, record.KeyId, record.Name });
    }

    private static async Task HandleDeleteScanned(HttpContext ctx, DatabaseService db, string id)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }
        await db.DeleteScannedKey(id);
        await ctx.Response.WriteAsJsonAsync(new { ok = true });
    }

}