using System.Security.Claims;
using Campaign_Tracker.Server.Audit;
using Campaign_Tracker.Server.Authorization;
using Campaign_Tracker.Server.ElectionCycles;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace Campaign_Tracker.Server.Controllers;

[ApiController]
[Authorize(Policy = ApplicationPolicy.ClientServicesAccess)]
[Route("api/election-cycles/jobs")]
public sealed class ElectionCycleJobsController : ControllerBase
{
    private readonly IElectionCycleJobRepository _jobs;
    private readonly IAuditService _audit;
    private readonly TimeProvider _timeProvider;

    public ElectionCycleJobsController(
        IElectionCycleJobRepository jobs,
        IAuditService audit,
        TimeProvider timeProvider)
    {
        _jobs = jobs;
        _audit = audit;
        _timeProvider = timeProvider;
    }

    [HttpPost]
    public async Task<ActionResult<ElectionCycleJobResponse>> Create(
        [FromBody] CreateElectionCycleJobRequest request,
        CancellationToken cancellationToken)
    {
        if (string.IsNullOrWhiteSpace(request.JCode))
            return UnprocessableEntity(new ElectionCycleJobProblem("Municipality identifier (JCode) is required."));

        if (string.IsNullOrWhiteSpace(request.CycleId) && string.IsNullOrWhiteSpace(request.CycleName))
            return UnprocessableEntity(new ElectionCycleJobProblem("Cycle selection is required — provide an existing cycle or a new cycle name."));

        var cycleId = string.IsNullOrWhiteSpace(request.CycleId)
            ? NormalizeNewCycleId(request.CycleName!)
            : request.CycleId.Trim();
        var cycleName = string.IsNullOrWhiteSpace(request.CycleName)
            ? cycleId // fallback — shouldn't happen given validation above
            : request.CycleName.Trim();

        var actor = GetActor();
        var result = await _jobs.CreateAsync(
            request.JCode,
            cycleId,
            cycleName,
            actor,
            cancellationToken);

        if (!result.Saved || result.Job is null)
            return UnprocessableEntity(new ElectionCycleJobProblem(result.Error ?? "Job creation failed."));

        _audit.Record(new AuditEvent(
            EventType: "ELECTION_CYCLE_JOB_CREATED",
            ActorIdentity: actor,
            Resource: $"election-cycles/jobs/{result.Job.JobId}",
            Outcome: $"created job for {request.JCode} in cycle {cycleName}",
            TraceIdentifier: HttpContext.TraceIdentifier,
            RecordedAt: _timeProvider.GetUtcNow()));

        return CreatedAtAction(
            nameof(GetById),
            new { jobId = result.Job.JobId },
            ElectionCycleJobResponse.From(result.Job));
    }

    [HttpGet("{jobId}")]
    public async Task<ActionResult<ElectionCycleJobResponse>> GetById(
        string jobId,
        CancellationToken cancellationToken)
    {
        var allAssignments = await _jobs.GetAllAsync(cancellationToken);
        var match = allAssignments.FirstOrDefault(a =>
            string.Equals(a.JobId, jobId, StringComparison.OrdinalIgnoreCase));

        if (match is null)
            return NotFound();

        // For dynamically created jobs we don't have full entity here from assignments;
        // the kanban read model serves as the source of truth for listing.
        // This endpoint returns the assignment data mapped to a response shape.
        return Ok(new ElectionCycleJobResponse(
            JobId: match.JobId,
            JCode: match.JCode,
            CycleId: match.CycleId,
            CycleName: match.CycleName,
            Status: match.Status,
            CreatedBy: "system",
            CreatedAt: DateTimeOffset.UtcNow.ToString("O")));
    }

    private static string NormalizeNewCycleId(string cycleName) =>
        cycleName.ToLowerInvariant()
            .Replace(" ", "-")
            .Replace("'", "")
            .Replace(",", "");

    private string GetActor() =>
        User.Identity?.Name
        ?? User.FindFirstValue(ClaimTypes.NameIdentifier)
        ?? "unknown";
}

public sealed record CreateElectionCycleJobRequest(
    string JCode,
    string? CycleId,
    string? CycleName);

public sealed record ElectionCycleJobResponse(
    string JobId,
    string JCode,
    string CycleId,
    string CycleName,
    string Status,
    string CreatedBy,
    string CreatedAt)
{
    public static ElectionCycleJobResponse From(ElectionCycleJob job) =>
        new(
            JobId: job.JobId,
            JCode: job.JCode,
            CycleId: job.CycleId,
            CycleName: job.CycleName,
            Status: job.Status,
            CreatedBy: job.CreatedBy,
            CreatedAt: job.CreatedAt.ToString("O"));
}

public sealed record ElectionCycleJobProblem(string Error);