using System;
using System.Collections.Generic;
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)
    {
        // Admin-Endpoints
        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}/public", HandleTogglePublic);
        app.MapDelete("/api/admin/api-keys/{keyId}", HandleDelete);
        app.MapPost("/api/admin/api-keys/{keyId}/check", HandleCheck);
        app.MapPost("/api/admin/api-keys/check-all", HandleCheckAll);

        // 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.MapGet("/api/admin/api-keys/scanned/summary", HandleGetScannedSummary);
        app.MapPost("/api/admin/api-keys/scanned/recheck-all", HandleRecheckAll);
        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);

        // Event Scanner Status & Log
        app.MapGet("/api/admin/api-keys/event-scanner/status", HandleEventScannerStatus);
        app.MapGet("/api/admin/api-keys/event-scanner/log", HandleEventScannerLog);

        // Scanner Logs (persistiert)
        app.MapGet("/api/admin/scanner/logs", HandleGetScannerLogs);

        // User-Endpoints (für alle authentifizierten User)
        app.MapGet("/api/api-keys/available", HandleGetAvailable);
        app.MapPut("/api/api-keys/select/{keyId}", HandleSelectKey);
        app.MapGet("/api/api-keys/selected", HandleGetSelected);
    }

    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.IsPublic,
            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 isPublic = body.TryGetProperty("isPublic", out var pub) && pub.GetBoolean();

        var record = new ApiKeyRecord
        {
            KeyId = Guid.NewGuid().ToString("N"),
            Provider = provider,
            Name = name,
            ApiKey = apiKey,
            IsPublic = isPublic,
            CreatedAt = now,
            UpdatedAt = now
        };

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

    private static async Task HandleUpdate(HttpContext ctx, 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;
        }

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

    private static async Task HandleTogglePublic(HttpContext ctx, 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;
        }

        var newPublic = !existing.IsPublic;
        await db.SetApiKeyPublic(keyId, newPublic);
        await ctx.Response.WriteAsJsonAsync(new { ok = true, isPublic = newPublic });
    }

    private static async Task HandleDelete(HttpContext ctx, 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;
        }

        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;
        }

        switch (existing.Provider)
        {
            case "anthropic":
            {
                var result = await AnthropicKeyChecker.CheckKeyAsync(httpFactory, existing.ApiKey);
                var dbStatus = (result.Status == "ok" || result.Status == "usage_limited") ? "valid" : result.Status;
                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
                });
                break;
            }
            case "openai":
            {
                var result = await OpenAiKeyChecker.CheckKeyAsync(httpFactory, existing.ApiKey);
                var dbStatus = result.Status == "ok" ? "valid" : result.Status;
                await db.UpdateApiKeyMeta(keyId, dbStatus, result.Message, null, null);
                await ctx.Response.WriteAsJsonAsync(new { status = dbStatus, message = result.Message, plan = result.Message });
                break;
            }
            case "google":
            {
                var result = await GoogleKeyChecker.CheckKeyAsync(httpFactory, existing.ApiKey);
                var dbStatus = result.Status == "ok" ? "valid" : result.Status;
                await db.UpdateApiKeyMeta(keyId, dbStatus, result.Message, null, null);
                await ctx.Response.WriteAsJsonAsync(new { status = dbStatus, message = result.Message, plan = result.Message });
                break;
            }
            case "stripe":
            {
                var result = await StripeKeyChecker.CheckKeyAsync(httpFactory, existing.ApiKey);
                var dbStatus = result.Status == "ok" ? "valid" : result.Status;
                await db.UpdateApiKeyMeta(keyId, dbStatus, result.Message, null, null);
                await ctx.Response.WriteAsJsonAsync(new {
                    status = dbStatus,
                    message = result.Message,
                    plan = result.IsLiveKey ? "Live" : "Test",
                    result.AccountId,
                    result.AccountName,
                    result.AccountEmail,
                    result.AccountCountry,
                    result.Currency,
                    result.BalanceAvailable,
                    result.BalancePending,
                    result.ChargesEnabled,
                    result.PayoutsEnabled
                });
                break;
            }
            default:
            {
                ctx.Response.StatusCode = 400;
                await ctx.Response.WriteAsJsonAsync(new { error = $"Check für Provider '{existing.Provider}' nicht unterstützt" });
                break;
            }
        }
    }

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

        var allKeys = await db.GetApiKeys();
        var results = new List<object>();

        foreach (var key in allKeys)
        {
            switch (key.Provider)
            {
                case "anthropic":
                {
                    var result = await AnthropicKeyChecker.CheckKeyAsync(httpFactory, key.ApiKey);
                    var dbStatus = (result.Status == "ok" || result.Status == "usage_limited") ? "valid" : result.Status;
                    await db.UpdateApiKeyMeta(key.KeyId, dbStatus, result.Plan, result.Usage7d, result.Usage5h);
                    results.Add(new { key.KeyId, key.Name, status = dbStatus, result.Plan, result.Usage5h, result.Usage7d });
                    break;
                }
                case "openai":
                {
                    var result = await OpenAiKeyChecker.CheckKeyAsync(httpFactory, key.ApiKey);
                    var dbStatus = result.Status == "ok" ? "valid" : result.Status;
                    await db.UpdateApiKeyMeta(key.KeyId, dbStatus, result.Message, null, null);
                    results.Add(new { key.KeyId, key.Name, status = dbStatus, Plan = result.Message, Usage5h = (double?)null, Usage7d = (double?)null });
                    break;
                }
                case "google":
                {
                    var result = await GoogleKeyChecker.CheckKeyAsync(httpFactory, key.ApiKey);
                    var dbStatus = result.Status == "ok" ? "valid" : result.Status;
                    await db.UpdateApiKeyMeta(key.KeyId, dbStatus, result.Message, null, null);
                    results.Add(new { key.KeyId, key.Name, status = dbStatus, Plan = result.Message, Usage5h = (double?)null, Usage7d = (double?)null });
                    break;
                }
                case "stripe":
                {
                    var result = await StripeKeyChecker.CheckKeyAsync(httpFactory, key.ApiKey);
                    var dbStatus = result.Status == "ok" ? "valid" : result.Status;
                    await db.UpdateApiKeyMeta(key.KeyId, dbStatus, result.Message, null, null);
                    results.Add(new { key.KeyId, key.Name, status = dbStatus, Plan = result.IsLiveKey ? "Live" : "Test", Usage5h = (double?)null, Usage7d = (double?)null });
                    break;
                }
            }
        }

        await ctx.Response.WriteAsJsonAsync(new { checked_ = results.Count, results });
    }

    // ── 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" });
        }

        var mode = ctx.Request.Query["mode"].FirstOrDefault() ?? "full";
        var validModes = new[] { "quick", "web", "full" };
        if (!validModes.Contains(mode)) mode = "full";

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

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

        var progress = scanner.Progress;
        return ctx.Response.WriteAsJsonAsync(new
        {
            running = scanner.IsRunning,
            lastRun = scanner.LastRun,
            lastResult = scanner.LastResult,
            phase = progress.Phase,
            detail = progress.Detail,
            current = progress.Current,
            total = progress.Total,
            keysFound = progress.KeysFound
        });
    }

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

        var type = ctx.Request.Query["type"].FirstOrDefault();
        var keys = string.IsNullOrEmpty(type)
            ? await db.GetScannedKeys()
            : await db.GetScannedKeysByType(type);

        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 HandleGetScannedSummary(HttpContext ctx, DatabaseService db)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        var summary = await db.GetScannedKeysSummary();
        await ctx.Response.WriteAsJsonAsync(summary);
    }

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

        var keys = await db.GetScannedKeys();
        var notAdopted = keys.Where(k => k.AdoptedApiKeyId == null).ToList();

        int success = 0, errors = 0;
        foreach (var sk in notAdopted)
        {
            try
            {
                await scanner.CheckAndUpdateKey(sk);
                success++;
            }
            catch { errors++; }
        }

        await ctx.Response.WriteAsJsonAsync(new { ok = true, total = notAdopted.Count, success, errors });
    }

    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");
        // Provider anhand des Key-Typs bestimmen
        var keyType = KeyPatterns.DetectType(sk.ApiKey);
        string provider;
        if (keyType.StartsWith("openai")) provider = "openai";
        else if (keyType == "google_api") provider = "google";
        else if (keyType.StartsWith("stripe")) provider = "stripe";
        else provider = "anthropic";

        var record = new ApiKeyRecord
        {
            KeyId = Guid.NewGuid().ToString("N"),
            Provider = provider,
            Name = title,
            ApiKey = sk.ApiKey,
            IsPublic = 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 });
    }

    // ── User-Endpoints ──

    private static async Task HandleGetAvailable(HttpContext ctx, DatabaseService db)
    {
        var userId = ctx.GetUserId();
        if (userId == null) { ctx.Response.StatusCode = 401; return; }

        var isAdmin = ctx.IsAdmin();
        var keys = isAdmin ? await db.GetApiKeys() : await db.GetPublicApiKeys();

        var result = keys.Select(k => new
        {
            k.KeyId,
            k.Provider,
            k.Name,
            k.IsPublic,
            k.Status,
            k.Plan,
            k.Usage7d,
            k.Usage5h,
            k.CheckedAt
        });
        await ctx.Response.WriteAsJsonAsync(result);
    }

    private static async Task HandleSelectKey(HttpContext ctx, DatabaseService db, string keyId)
    {
        var userId = ctx.GetUserId();
        if (userId == null) { ctx.Response.StatusCode = 401; return; }

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

        // Nicht-Admins dürfen nur public Keys auswählen
        if (!ctx.IsAdmin() && !key.IsPublic)
        {
            ctx.Response.StatusCode = 403;
            await ctx.Response.WriteAsJsonAsync(new { error = "Key ist nicht öffentlich" });
            return;
        }

        var agentId = ctx.Request.Query["agentId"].FirstOrDefault();
        if (string.IsNullOrEmpty(agentId))
        {
            ctx.Response.StatusCode = 400;
            await ctx.Response.WriteAsJsonAsync(new { error = "agentId required" });
            return;
        }

        await db.SetAgentApiKey(userId, agentId, keyId);
        await ctx.Response.WriteAsJsonAsync(new { ok = true, keyId, agentId, name = key.Name });
    }

    private static async Task HandleGetSelected(HttpContext ctx, DatabaseService db)
    {
        var userId = ctx.GetUserId();
        if (userId == null) { ctx.Response.StatusCode = 401; return; }

        var agentId = ctx.Request.Query["agentId"].FirstOrDefault();
        if (string.IsNullOrEmpty(agentId))
        {
            await ctx.Response.WriteAsJsonAsync(new { selected = false });
            return;
        }

        var key = await db.GetAgentApiKeyRecord(userId, agentId);
        if (key == null)
        {
            await ctx.Response.WriteAsJsonAsync(new { selected = false });
            return;
        }

        await ctx.Response.WriteAsJsonAsync(new
        {
            selected = true,
            keyId = key.KeyId,
            provider = key.Provider,
            name = key.Name,
            isPublic = key.IsPublic,
            status = key.Status,
            plan = key.Plan,
            usage5h = key.Usage5h,
            usage7d = key.Usage7d
        });
    }

    private static async Task HandleEventScannerStatus(HttpContext ctx, GitHubEventScannerService scanner)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        await ctx.Response.WriteAsJsonAsync(new
        {
            enabled = scanner.Enabled,
            running = scanner.IsRunning,
            lastPoll = scanner.LastPoll,
            eventsPerHour = scanner.EventsPerHour,
            keysFoundTotal = scanner.KeysFoundTotal,
            pollCount = scanner.PollCount,
            lastError = scanner.LastError
        });
    }

    private static async Task HandleEventScannerLog(HttpContext ctx, GitHubEventScannerService scanner)
    {
        if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return; }

        var log = scanner.GetLog();
        await ctx.Response.WriteAsJsonAsync(new { entries = log.Select(e => new { e.Time, e.Type, e.Message }) });
    }

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

        var limit = int.TryParse(ctx.Request.Query["limit"], out var l) ? Math.Min(l, 1000) : 200;
        var offset = int.TryParse(ctx.Request.Query["offset"], out var o) ? o : 0;
        var type = ctx.Request.Query["type"].FirstOrDefault();
        var scanner = ctx.Request.Query["scanner"].FirstOrDefault();

        var logs = await db.GetScannerLogs(limit, offset, type, scanner);
        var total = await db.GetScannerLogCount(type, scanner);

        await ctx.Response.WriteAsJsonAsync(new { logs, total });
    }

}