using CalendarReminder.Api.Data;
using CalendarReminder.Api.Services;
using CalendarReminder.Domain.Entities;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace CalendarReminder.Api.Controllers;

[Authorize]
[ApiController]
[Route("api/admin")]
public class AdminController : ControllerBase
{
    private readonly AppDbContext _db;
    private readonly EmailService _email;

    public AdminController(AppDbContext db, EmailService email)
    {
        _db = db;
        _email = email;
    }

    private bool IsAdmin => User.FindFirst("isAdmin")?.Value == "true";

    // ══════════════════════════════
    //  RODINY
    // ══════════════════════════════

    [HttpGet("families")]
    public async Task<IActionResult> GetFamilies()
    {
        if (!IsAdmin) return Forbid();
        var families = await _db.Families
            .Include(f => f.Users)
            .Select(f => new { f.Id, f.Name, MemberCount = f.Users.Count })
            .ToListAsync();
        return Ok(families);
    }

    [HttpPost("families")]
    public async Task<IActionResult> CreateFamily([FromBody] FamilyRequest req)
    {
        if (!IsAdmin) return Forbid();
        if (await _db.Families.AnyAsync(f => f.Name == req.Name))
            return BadRequest("Rodina s týmto názvom už existuje.");
        var family = new Family { Name = req.Name };
        _db.Families.Add(family);
        await _db.SaveChangesAsync();
        return Ok(new { family.Id, family.Name, MemberCount = 0 });
    }

    [HttpPut("families/{id}")]
    public async Task<IActionResult> UpdateFamily(int id, [FromBody] FamilyRequest req)
    {
        if (!IsAdmin) return Forbid();
        var family = await _db.Families.FindAsync(id);
        if (family is null) return NotFound();
        if (await _db.Families.AnyAsync(f => f.Name == req.Name && f.Id != id))
            return BadRequest("Názov je obsadený.");
        family.Name = req.Name;
        await _db.SaveChangesAsync();
        return Ok(family);
    }

    [HttpDelete("families/{id}")]
    public async Task<IActionResult> DeleteFamily(int id)
    {
        if (!IsAdmin) return Forbid();
        var family = await _db.Families.Include(f => f.Users).FirstOrDefaultAsync(f => f.Id == id);
        if (family is null) return NotFound();
        if (family.Users.Any()) return BadRequest("Rodina má členov. Najprv presun alebo odstraň používateľov.");
        _db.Families.Remove(family);
        await _db.SaveChangesAsync();
        return NoContent();
    }

    // ══════════════════════════════
    //  POUŽÍVATELIA
    // ══════════════════════════════

    [HttpGet("users")]
    public async Task<IActionResult> GetUsers()
    {
        if (!IsAdmin) return Forbid();
        var users = await _db.Users
            .Include(u => u.Family)
            .Select(u => new {
                u.Id, u.Username, u.Email, u.IsAdmin,
                u.MustChangePassword, u.CreatedAt,
                FamilyId   = u.FamilyId,
                FamilyName = u.Family != null ? u.Family.Name : null
            })
            .ToListAsync();
        return Ok(users);
    }

    [HttpPost("users")]
    public async Task<IActionResult> CreateUser([FromBody] CreateUserRequest req)
    {
        if (!IsAdmin) return Forbid();
        if (await _db.Users.AnyAsync(u => u.Email == req.Email))
            return BadRequest("Email je už registrovaný.");
        if (await _db.Users.AnyAsync(u => u.Username == req.Username))
            return BadRequest("Meno je obsadené.");

        var user = new User
        {
            Username = req.Username,
            Email    = req.Email,
            FamilyId = req.FamilyId,
            PasswordHash = BCrypt.Net.BCrypt.HashPassword("user"),
            MustChangePassword = true
        };
        _db.Users.Add(user);
        await _db.SaveChangesAsync();

        // Email notifikácia
        await _email.SendAsync(req.Email, req.Username,
            "👋 Vítaj v Calendar Reminder — bol ti vytvorený účet",
            $"""
            <div style="font-family:Segoe UI,sans-serif;max-width:520px;margin:auto;background:#161b22;color:#e1e4e8;border-radius:10px;overflow:hidden">
              <div style="background:#238636;padding:1.2rem 1.5rem">
                <h2 style="margin:0;color:#fff;font-size:1.1rem">👋 Bol ti vytvorený účet</h2>
              </div>
              <div style="padding:1.5rem">
                <p style="margin:0 0 1rem">Ahoj <strong>{req.Username}</strong>, bol ti vytvorený účet v aplikácii <strong>Calendar Reminder</strong>.</p>
                <table style="width:100%;border-collapse:collapse">
                  <tr><td style="padding:0.4rem 0;color:#8b949e;width:80px">Meno</td><td style="padding:0.4rem 0;font-weight:600">{req.Username}</td></tr>
                  <tr><td style="padding:0.4rem 0;color:#8b949e">Email</td><td style="padding:0.4rem 0;font-weight:600">{req.Email}</td></tr>
                  <tr><td style="padding:0.4rem 0;color:#8b949e">Heslo</td><td style="padding:0.4rem 0;font-weight:600">user</td></tr>
                </table>
                <p style="margin:1.25rem 0 0;color:#f85149;font-size:0.88rem">⚠️ Po prvom prihlásení si zmeň heslo cez „Zabudol som heslo".</p>
              </div>
              <div style="padding:0.75rem 1.5rem;border-top:1px solid #30363d;font-size:0.78rem;color:#6e7681">Calendar Reminder</div>
            </div>
            """);

        return Ok(new { user.Id, user.Username, user.Email, user.FamilyId, user.MustChangePassword });
    }

    [HttpPut("users/{id}")]
    public async Task<IActionResult> UpdateUser(int id, [FromBody] UpdateUserRequest req)
    {
        if (!IsAdmin) return Forbid();
        var user = await _db.Users.FindAsync(id);
        if (user is null) return NotFound();
        if (await _db.Users.AnyAsync(u => u.Email == req.Email && u.Id != id))
            return BadRequest("Email je obsadený.");
        if (await _db.Users.AnyAsync(u => u.Username == req.Username && u.Id != id))
            return BadRequest("Meno je obsadené.");

        user.Username = req.Username;
        user.Email    = req.Email;
        user.FamilyId = req.FamilyId;
        await _db.SaveChangesAsync();
        return Ok(new { user.Id, user.Username, user.Email, user.FamilyId });
    }

    [HttpDelete("users/{id}")]
    public async Task<IActionResult> DeleteUser(int id)
    {
        if (!IsAdmin) return Forbid();
        var myId = int.Parse(User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)!.Value);
        if (id == myId) return BadRequest("Nemôžeš zmazať sám seba.");
        var user = await _db.Users.FindAsync(id);
        if (user is null) return NotFound();
        _db.Users.Remove(user);
        await _db.SaveChangesAsync();
        return NoContent();
    }
}

public record FamilyRequest(string Name);
public record CreateUserRequest(string Username, string Email, int? FamilyId);
public record UpdateUserRequest(string Username, string Email, int? FamilyId);