using Management.Data;
using Management.Security;
using Microsoft.AspNetCore.Mvc;
using System.Text.Json;

namespace Management.Controllers.Admin;

/// <summary>
/// Admin endpoints for the recommendation engine.
///
/// ENDPOINTS:
/// GET    /api/admin/recommendations/rules            - List all rules
/// GET    /api/admin/recommendations/rules/{id}       - Get rule
/// POST   /api/admin/recommendations/rules            - Create rule
/// PUT    /api/admin/recommendations/rules/{id}       - Update rule
/// DELETE /api/admin/recommendations/rules/{id}       - Delete rule
/// POST   /api/admin/recommendations/evaluate         - Trigger evaluation
/// POST   /api/admin/recommendations/cleanup          - Cleanup old records
///
/// Client-facing endpoints (list, dismiss, resolve) remain on Gateway
/// at /api/recommendations — scoped to the authenticated CIAM session.
/// </summary>
[ApiController]
[Route("api/admin/recommendations")]
public sealed class AdminRecommendationsController : AdminControllerBase
{
    public AdminRecommendationsController(
        SqlService sql, ClientContext client, ILogger<AdminRecommendationsController> log)
        : base(sql, client, log) { }

    // ────────────────────────────────────────────────
    // Rule Management
    // ────────────────────────────────────────────────

    [HttpGet("rules")]
    public Task<IActionResult> ListRules(
        [FromQuery] string? category,
        [FromQuery] string? channel,
        CancellationToken ct)
        => CallProc("spRecommendation", "rules.list", new { category, channel }, ct);

    [HttpGet("rules/{ruleId:int}")]
    public Task<IActionResult> GetRule(int ruleId, CancellationToken ct)
        => CallProc("spRecommendation", "rules.get", new { ruleId }, ct);

    [HttpPost("rules")]
    public Task<IActionResult> CreateRule([FromBody] RuleRequest request, CancellationToken ct)
    {
        if (string.IsNullOrWhiteSpace(request?.Code))
            return Task.FromResult(ValidationError("code is required"));
        if (string.IsNullOrWhiteSpace(request.Name))
            return Task.FromResult(ValidationError("name is required"));

        Logger.LogInformation("[Admin] CreateRecommendationRule {Code} | By={User}", request.Code, Client.Email);

        return CallProc("spRecommendation", "rules.create", new
        {
            request.Code,
            request.Name,
            request.Category,
            request.Metric,
            request.Operator,
            request.Threshold,
            request.ThresholdType,
            request.Severity,
            request.Channel,
            request.Objective,
            request.Message,
            request.AdminNotes,
            request.LookbackDays,
            request.MinDataDays,
            request.CooldownHours,
            request.SortOrder
        }, ct);
    }

    [HttpPut("rules/{ruleId:int}")]
    public Task<IActionResult> UpdateRule(int ruleId, [FromBody] RuleRequest request, CancellationToken ct)
    {
        Logger.LogInformation("[Admin] UpdateRecommendationRule {Id} | By={User}", ruleId, Client.Email);

        return CallProc("spRecommendation", "rules.update", new
        {
            ruleId,
            request.Name,
            request.Category,
            request.Metric,
            request.Operator,
            request.Threshold,
            request.ThresholdType,
            request.Severity,
            request.Channel,
            request.Objective,
            request.Message,
            request.AdminNotes,
            request.LookbackDays,
            request.MinDataDays,
            request.CooldownHours,
            request.IsActive,
            request.SortOrder
        }, ct);
    }

    [HttpDelete("rules/{ruleId:int}")]
    public Task<IActionResult> DeleteRule(int ruleId, CancellationToken ct)
    {
        Logger.LogInformation("[Admin] DeleteRecommendationRule {Id} | By={User}", ruleId, Client.Email);
        return CallProc("spRecommendation", "rules.delete", new { ruleId }, ct);
    }

    // ────────────────────────────────────────────────
    // Evaluation Engine
    // ────────────────────────────────────────────────

    /// <summary>
    /// Trigger rule evaluation for a campaign, initiative, client, or all active campaigns.
    /// </summary>
    [HttpPost("evaluate")]
    public Task<IActionResult> Evaluate([FromBody] EvaluateRequest? request, CancellationToken ct)
    {
        Logger.LogInformation("[Admin] Evaluate | ClientId={Client} InitiativeId={Init} | By={User}",
            request?.ClientId, request?.InitiativeId, Client.Email);

        return CallProc("spRecommendation", "evaluate", new
        {
            channelCampaignId = request?.ChannelCampaignId,
            initiativeId      = request?.InitiativeId,
            clientId          = request?.ClientId
        }, ct);
    }

    /// <summary>
    /// Cleanup expired and old recommendations.
    /// </summary>
    [HttpPost("cleanup")]
    public Task<IActionResult> Cleanup([FromBody] CleanupRequest? request, CancellationToken ct)
    {
        Logger.LogInformation("[Admin] RecommendationCleanup daysToKeep={Days} | By={User}",
            request?.DaysToKeep ?? 90, Client.Email);

        return CallProc("spRecommendation", "cleanup",
            new { daysToKeep = request?.DaysToKeep ?? 90 }, ct);
    }
}

// ── Request DTOs ──

public sealed class RuleRequest
{
    public string? Code          { get; set; }
    public string? Name          { get; set; }
    public string? Category      { get; set; }
    public string? Metric        { get; set; }
    public string? Operator      { get; set; }
    public decimal? Threshold    { get; set; }
    public string? ThresholdType { get; set; }
    public string? Severity      { get; set; }
    public string? Channel       { get; set; }
    public string? Objective     { get; set; }
    public string? Message       { get; set; }
    public string? AdminNotes    { get; set; }
    public int? LookbackDays     { get; set; }
    public int? MinDataDays      { get; set; }
    public int? CooldownHours    { get; set; }
    public bool? IsActive        { get; set; }
    public int? SortOrder        { get; set; }
}

public sealed class EvaluateRequest
{
    public long?   ChannelCampaignId { get; set; }
    public long?   InitiativeId      { get; set; }
    public string? ClientId          { get; set; }
}

public sealed class CleanupRequest
{
    public int? DaysToKeep { get; set; }
}