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

namespace Campaign_Tracker.Server.Controllers;

[ApiController]
[Authorize(Policy = ApplicationPolicy.ClientServicesAccess)]
[Route("api/municipalities/{profileId}/contacts")]
public sealed class MunicipalityContactsController : ControllerBase
{
    private readonly IMunicipalityProfileRepository _profiles;
    private readonly IMunicipalityContactRepository _contacts;
    private readonly IAuditService _audit;
    private readonly TimeProvider _timeProvider;

    public MunicipalityContactsController(
        IMunicipalityProfileRepository profiles,
        IMunicipalityContactRepository contacts,
        IAuditService audit,
        TimeProvider timeProvider)
    {
        _profiles = profiles;
        _contacts = contacts;
        _audit = audit;
        _timeProvider = timeProvider;
    }

    [HttpGet]
    public async Task<ActionResult<IReadOnlyList<MunicipalityContactResponse>>> GetAll(
        string profileId,
        CancellationToken cancellationToken)
    {
        if (!await ProfileExists(profileId, cancellationToken))
            return NotFound();

        var contacts = await _contacts.GetByProfileIdAsync(profileId, cancellationToken);
        return Ok(contacts.Select(MunicipalityContactResponse.From).ToArray());
    }

    [HttpGet("{contactId}")]
    public async Task<ActionResult<MunicipalityContactResponse>> GetById(
        string profileId,
        string contactId,
        CancellationToken cancellationToken)
    {
        var contact = await _contacts.GetByIdAsync(contactId, cancellationToken);
        return IsContactInProfile(contact, profileId)
            ? Ok(MunicipalityContactResponse.From(contact!))
            : NotFound();
    }

    [HttpPost]
    public async Task<ActionResult<MunicipalityContactResponse>> Add(
        string profileId,
        [FromBody] AddMunicipalityContactRequest request,
        CancellationToken cancellationToken)
    {
        if (!await ProfileExists(profileId, cancellationToken))
            return NotFound();

        var actor = GetActor();
        var result = await _contacts.AddAsync(
            profileId,
            request.ContactType,
            request.Name,
            request.RoleTitle,
            request.Phone,
            request.Email,
            actor,
            cancellationToken);

        if (!result.Saved || result.Contact is null)
            return UnprocessableEntity(new MunicipalityContactProblem(result.Error ?? "Save failed."));

        _audit.Record(new AuditEvent(
            EventType: "MUNICIPALITY_CONTACT_ADDED",
            ActorIdentity: actor,
            Resource: $"municipalities/{profileId}/contacts/{result.Contact.ContactId}",
            Outcome: $"added {result.Contact.ContactType} contact",
            TraceIdentifier: HttpContext.TraceIdentifier,
            RecordedAt: _timeProvider.GetUtcNow()));

        return CreatedAtAction(nameof(GetById),
            new { profileId, contactId = result.Contact.ContactId },
            MunicipalityContactResponse.From(result.Contact));
    }

    [HttpPut("{contactId}")]
    public async Task<ActionResult<MunicipalityContactResponse>> Update(
        string profileId,
        string contactId,
        [FromBody] UpdateMunicipalityContactRequest request,
        CancellationToken cancellationToken)
    {
        var existing = await _contacts.GetByIdAsync(contactId, cancellationToken);
        if (!IsContactInProfile(existing, profileId))
            return NotFound(new MunicipalityContactProblem("Contact not found."));

        var actor = GetActor();
        var result = await _contacts.UpdateAsync(
            contactId,
            request.ContactType,
            request.Name,
            request.RoleTitle,
            request.Phone,
            request.Email,
            actor,
            cancellationToken);

        if (!result.Saved || result.Contact is null)
        {
            if (result.IsNotFound)
                return NotFound(new MunicipalityContactProblem(result.Error ?? "Contact not found."));
            return UnprocessableEntity(new MunicipalityContactProblem(result.Error ?? "Update failed."));
        }

        _audit.Record(new AuditEvent(
            EventType: "MUNICIPALITY_CONTACT_UPDATED",
            ActorIdentity: actor,
            Resource: $"municipalities/{profileId}/contacts/{contactId}",
            Outcome: $"updated {result.Contact.ContactType} contact",
            TraceIdentifier: HttpContext.TraceIdentifier,
            RecordedAt: _timeProvider.GetUtcNow()));

        return Ok(MunicipalityContactResponse.From(result.Contact));
    }

    [HttpDelete("{contactId}")]
    public async Task<IActionResult> Delete(
        string profileId,
        string contactId,
        CancellationToken cancellationToken)
    {
        var existing = await _contacts.GetByIdAsync(contactId, cancellationToken);
        if (!IsContactInProfile(existing, profileId))
            return NotFound();

        var actor = GetActor();
        var result = await _contacts.SoftDeleteAsync(contactId, actor, cancellationToken);

        if (!result.Saved)
            return result.IsNotFound ? NotFound() : UnprocessableEntity();

        _audit.Record(new AuditEvent(
            EventType: "MUNICIPALITY_CONTACT_DELETED",
            ActorIdentity: actor,
            Resource: $"municipalities/{profileId}/contacts/{contactId}",
            Outcome: "soft-deleted",
            TraceIdentifier: HttpContext.TraceIdentifier,
            RecordedAt: _timeProvider.GetUtcNow()));

        return NoContent();
    }

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

    private async Task<bool> ProfileExists(
        string profileId,
        CancellationToken cancellationToken) =>
        await _profiles.GetByIdAsync(profileId, cancellationToken) is not null;

    private static bool IsContactInProfile(
        MunicipalityContact? contact,
        string profileId) =>
        contact is not null &&
        string.Equals(contact.ProfileId, profileId, StringComparison.OrdinalIgnoreCase);
}

public sealed record AddMunicipalityContactRequest(
    string ContactType,
    string Name,
    string? RoleTitle,
    string? Phone,
    string? Email);

public sealed record UpdateMunicipalityContactRequest(
    string ContactType,
    string Name,
    string? RoleTitle,
    string? Phone,
    string? Email);

public sealed record MunicipalityContactResponse(
    string ContactId,
    string ProfileId,
    string ContactType,
    string Name,
    string? RoleTitle,
    string? Phone,
    string? Email,
    string CreatedAt,
    string CreatedBy,
    string UpdatedAt,
    string UpdatedBy)
{
    public static MunicipalityContactResponse From(MunicipalityContact c) =>
        new(c.ContactId, c.ProfileId, c.ContactType, c.Name, c.RoleTitle, c.Phone, c.Email,
            c.CreatedAt.ToString("O"), c.CreatedBy, c.UpdatedAt.ToString("O"), c.UpdatedBy);
}

public sealed record MunicipalityContactProblem(string Error);