using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing;
using Microsoft.EntityFrameworkCore;
using TeamUp.Modules.Integrations.Domain;
using TeamUp.Modules.Integrations.Persistence;
using TeamUp.Modules.Integrations.Security;
using TeamUp.SharedKernel.Access;
using TeamUp.SharedKernel.Ai;
using TeamUp.SharedKernel.Modularity;

namespace TeamUp.Modules.Integrations.Endpoints;

internal static class IntegrationsEndpoints
{
    public static void Map(IEndpointRouteBuilder endpoints)
    {
        var group = endpoints.MapGroup("/api/integrations").WithTags("Integrations");

        group.MapGet("/ping", () => TypedResults.Ok(new ModulePing("integrations")));
        group.MapPost("/api-configs", CreateApiConfig).RequireAuthorization();
        group.MapGet("/api-configs", ListApiConfigs).RequireAuthorization();
        group.MapPost("/api-configs/{id:guid}/test", TestApiConfig).RequireAuthorization();
        group.MapDelete("/api-configs/{id:guid}", DeleteApiConfig).RequireAuthorization();
    }

    // Owner-only. Encrypts the key; the response never includes it.
    private static async Task<IResult> CreateApiConfig(
        CreateApiConfigRequest request, ICurrentUser user, IPermissionService permissions,
        IntegrationsDbContext db, ISecretProtector protector, TimeProvider clock, CancellationToken ct)
    {
        if (!permissions.Has(Capability.ManageApiKeys, ScopeRef.Org(request.OrganizationId)))
        {
            return Results.Forbid();
        }

        if (string.IsNullOrWhiteSpace(request.Name) || string.IsNullOrWhiteSpace(request.Provider)
            || string.IsNullOrWhiteSpace(request.Model) || string.IsNullOrWhiteSpace(request.ApiKey))
        {
            return Results.BadRequest("Name, provider, model and apiKey are required.");
        }

        var config = new ApiConfig(
            request.OrganizationId, request.Name.Trim(), request.Provider.Trim(), request.Model.Trim(),
            request.Endpoint, protector.Protect(request.ApiKey), user.MemberId, clock.GetUtcNow());

        db.ApiConfigs.Add(config);
        await db.SaveChangesAsync(ct);
        return Results.Ok(ToDto(config));
    }

    // Team owners may list (to assign) — without ever seeing the key.
    private static async Task<IResult> ListApiConfigs(
        Guid organizationId, IPermissionService permissions, IntegrationsDbContext db, CancellationToken ct)
    {
        if (!permissions.Has(Capability.ConfigureAgents, ScopeRef.Org(organizationId)))
        {
            return Results.Forbid();
        }

        var configs = await db.ApiConfigs
            .Where(c => c.OrganizationId == organizationId)
            .OrderBy(c => c.Name)
            .Select(c => new ApiConfigDto(c.Id, c.Name, c.Provider, c.Model, c.Endpoint))
            .ToListAsync(ct);

        return Results.Ok(configs);
    }

    // Owner-only. Resolves + decrypts server-side, makes a tiny model call, returns the outcome.
    private static async Task<IResult> TestApiConfig(
        Guid id, IPermissionService permissions, IntegrationsDbContext db,
        IApiConfigResolver resolver, IModelClient model, CancellationToken ct)
    {
        var config = await db.ApiConfigs.FirstOrDefaultAsync(c => c.Id == id, ct);
        if (config is null)
        {
            return Results.NotFound();
        }

        if (!permissions.Has(Capability.ManageApiKeys, ScopeRef.Org(config.OrganizationId)))
        {
            return Results.Forbid();
        }

        var resolved = await resolver.ResolveAsync(id, ct);
        if (resolved is null)
        {
            return Results.NotFound();
        }

        var completion = await model.CompleteAsync(
            new ModelRequest(resolved.Provider, resolved.Model, resolved.ApiKey, resolved.Endpoint, "ping", MaxTokens: 16), ct);

        var sample = completion.Text is { Length: > 0 } text ? text[..Math.Min(text.Length, 80)] : null;
        return Results.Ok(new TestResultDto(completion.Success, completion.Error, completion.LatencyMs, sample));
    }

    private static async Task<IResult> DeleteApiConfig(
        Guid id, IPermissionService permissions, IntegrationsDbContext db, CancellationToken ct)
    {
        var config = await db.ApiConfigs.FirstOrDefaultAsync(c => c.Id == id, ct);
        if (config is null)
        {
            return Results.NotFound();
        }

        if (!permissions.Has(Capability.ManageApiKeys, ScopeRef.Org(config.OrganizationId)))
        {
            return Results.Forbid();
        }

        db.ApiConfigs.Remove(config);
        await db.SaveChangesAsync(ct);
        return Results.NoContent();
    }

    private static ApiConfigDto ToDto(ApiConfig config) =>
        new(config.Id, config.Name, config.Provider, config.Model, config.Endpoint);
}