package com.l2.shots.auth;

import io.quarkus.security.Authenticated;
import jakarta.annotation.security.RolesAllowed;
import jakarta.inject.Inject;
import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.Context;
import jakarta.ws.rs.core.HttpHeaders;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.NewCookie;
import jakarta.ws.rs.core.Response;
import org.eclipse.microprofile.config.inject.ConfigProperty;
import org.eclipse.microprofile.jwt.JsonWebToken;

import java.util.Optional;
import java.util.UUID;

@Path("/api/auth")
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class AuthResource {

    @Inject
    AuthService authService;

    @Inject
    JwtCookieAuth jwtCookieAuth;

    @Inject
    JsonWebToken currentJwt;

    @ConfigProperty(name = "app.auth.cookie-name")
    String cookieName;

    @ConfigProperty(name = "app.auth.cookie-max-age-seconds")
    int cookieMaxAge;

    @POST
    @Path("/register")
    public Response register(Credentials creds) {
        Optional<User> result = authService.register(creds.username(), creds.password());
        if (result.isEmpty()) {
            return Response.status(409)
                    .entity(new ErrorBody("username no disponible o datos inválidos"))
                    .build();
        }
        User user = result.get();
        String token = authService.buildToken(user.id);
        return Response.ok(AuthService.toAuthMe(user))
                .cookie(buildAuthCookie(token))
                .build();
    }

    @POST
    @Path("/login")
    public Response login(Credentials creds) {
        Optional<User> result = authService.authenticate(creds.username(), creds.password());
        if (result.isEmpty()) {
            return Response.status(401)
                    .entity(new ErrorBody("credenciales inválidas"))
                    .build();
        }
        User user = result.get();
        String token = authService.buildToken(user.id);
        return Response.ok(AuthService.toAuthMe(user))
                .cookie(buildAuthCookie(token))
                .build();
    }

    @POST
    @Path("/logout")
    public Response logout() {
        return Response.noContent()
                .cookie(clearAuthCookie())
                .build();
    }

    @POST
    @Path("/change-password")
    @Authenticated
    public Response changePassword(@Context HttpHeaders headers, ChangePasswordRequest body) {
        if (body == null || body.currentPassword() == null || body.newPassword() == null) {
            return Response.status(400).entity(new ErrorBody("Faltan campos requeridos")).build();
        }
        Optional<JsonWebToken> jwt = jwtCookieAuth.extractToken(headers);
        if (jwt.isEmpty()) return Response.status(401).build();
        Optional<User> user = authService.getEntityFromToken(jwt.get());
        if (user.isEmpty()) return Response.status(401).build();
        AuthService.ChangePasswordResult result = authService.changePassword(
                user.get().id, body.currentPassword(), body.newPassword());
        switch (result) {
            case OK:
                User refreshed = User.findById(user.get().id);
                if (refreshed == null) return Response.status(401).build();
                String newToken = authService.buildToken(refreshed.id);
                return Response.ok(AuthService.toAuthMe(refreshed))
                        .cookie(buildAuthCookie(newToken))
                        .build();
            case WRONG_CURRENT_PASSWORD:
                return Response.status(401).entity(new ErrorBody("La contraseña actual es incorrecta")).build();
            case WEAK_NEW_PASSWORD:
                return Response.status(400).entity(new ErrorBody(
                        "La nueva contraseña debe tener al menos " + AuthService.MIN_PASSWORD_LENGTH + " caracteres")).build();
            case NOT_FOUND:
                return Response.status(401).build();
            default:
                return Response.status(500).build();
        }
    }

    @POST
    @Path("/admin/reset-password")
    @RolesAllowed("admin")
    public Response adminResetPassword(AdminResetPasswordRequest body) {
        if (body == null || body.username() == null || body.newPassword() == null) {
            return Response.status(400).entity(new ErrorBody("Faltan campos requeridos")).build();
        }
        UUID requesterId;
        try {
            requesterId = UUID.fromString(currentJwt.getSubject());
        } catch (Exception e) {
            return Response.status(401).build();
        }
        boolean ok = authService.resetPasswordAsAdmin(requesterId, body.username(), body.newPassword());
        if (!ok) {
            return Response.status(400).entity(new ErrorBody("Usuario no encontrado o contraseña inválida")).build();
        }
        return Response.ok().build();
    }

    @GET
    @Path("/me")
    public Response me(@Context HttpHeaders headers) {
        Optional<JsonWebToken> jwt = jwtCookieAuth.extractToken(headers);
        if (jwt.isEmpty()) {
            return Response.status(401).build();
        }
        return authService.getUserFromToken(jwt.get())
                .map(u -> Response.ok(u).build())
                .orElse(Response.status(401).build());
    }

    @GET
    @Path("/admin/users")
    @RolesAllowed("admin")
    public Response adminListUsers() {
        return Response.ok(authService.listUsersForAdmin()).build();
    }

    @GET
    @Path("/check")
    @Authenticated
    public Response check() {
        return Response.ok().build();
    }

    private NewCookie buildAuthCookie(String token) {
        return new NewCookie.Builder(cookieName)
                .value(token)
                .path("/")
                .httpOnly(true)
                .secure(false)
                .sameSite(NewCookie.SameSite.LAX)
                .maxAge(cookieMaxAge)
                .build();
    }

    private NewCookie clearAuthCookie() {
        return new NewCookie.Builder(cookieName)
                .value("")
                .path("/")
                .httpOnly(true)
                .secure(false)
                .sameSite(NewCookie.SameSite.LAX)
                .maxAge(0)
                .build();
    }

    public record ErrorBody(String error) {
    }
}