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.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);

        // 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;
        }

        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
        });
    }

    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 anthropicKeys = allKeys.Where(k => k.Provider == "anthropic").ToList();

        var results = new List<object>();
        foreach (var key in anthropicKeys)
        {
            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 });
        }

        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; }

        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,
            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;
        }

        await db.SetUserSelectedApiKey(userId, keyId);
        await ctx.Response.WriteAsJsonAsync(new { ok = true, keyId, 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 key = await db.GetUserSelectedApiKey(userId);
        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
        });
    }

}