using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Tiku.Application.Auth;
using Tiku.Api.Contracts;
using Tiku.Application.Security;
using Tiku.Application.Tenancy;
using Tiku.Infrastructure.Content;

namespace Tiku.Api.Controllers;

[ApiController]
[Route("api/auth")]
[Produces("application/json")]
public sealed class AuthController(
    IAuthService authService,
    ISessionService sessionService,
    ITenantContext tenantContext,
    ITenantContextInitializer tenantContextInitializer,
    ITenantDirectory tenantDirectory) : ControllerBase
{
    [AllowAnonymous]
    [HttpPost("login/password")]
    [EndpointSummary("手机号密码登录")]
    [EndpointDescription("使用本地手机号和密码登录，签发 JWT access token 与数据库 refresh/session。")]
    [ProducesResponseType<AuthenticatedUserDto>(StatusCodes.Status200OK)]
    [ProducesResponseType<ProblemDetails>(StatusCodes.Status401Unauthorized)]
    public async Task<ActionResult<AuthenticatedUserDto>> LoginWithPassword(
        [FromBody] PasswordLoginDto request,
        CancellationToken cancellationToken)
    {
        var result = await authService.LoginWithPasswordAsync(
            new PasswordLoginRequest(
                await ResolveTenantIdAsync(request.TenantCode, cancellationToken),
                request.Phone,
                request.Password,
                GetIpAddress(),
                Request.Headers.UserAgent.ToString()),
            cancellationToken);

        return Ok(AuthenticatedUserDto.FromApplication(result));
    }

    [AllowAnonymous]
    [HttpPost("login/sms")]
    [EndpointSummary("短信验证码登录")]
    [EndpointDescription("校验已发送的登录用途短信验证码，成功后签发 JWT access token 与数据库 refresh/session。")]
    [ProducesResponseType<AuthenticatedUserDto>(StatusCodes.Status200OK)]
    [ProducesResponseType<ProblemDetails>(StatusCodes.Status401Unauthorized)]
    public async Task<ActionResult<AuthenticatedUserDto>> LoginWithSms(
        [FromBody] SmsLoginDto request,
        CancellationToken cancellationToken)
    {
        var result = await authService.LoginWithSmsAsync(
            new SmsLoginRequest(
                await ResolveTenantIdAsync(request.TenantCode, cancellationToken),
                request.Phone,
                request.Code,
                GetIpAddress(),
                Request.Headers.UserAgent.ToString()),
            cancellationToken);

        return Ok(AuthenticatedUserDto.FromApplication(result));
    }

    [AllowAnonymous]
    [HttpPost("oauth/wechat")]
    [EndpointSummary("微信网页 OAuth 登录")]
    [EndpointDescription("使用微信网页授权 code 换取 openid/unionid，upsert 用户身份并创建应用会话。")]
    [ProducesResponseType<AuthenticatedUserDto>(StatusCodes.Status200OK)]
    [ProducesResponseType<ProblemDetails>(StatusCodes.Status401Unauthorized)]
    [ProducesResponseType<ProblemDetails>(StatusCodes.Status503ServiceUnavailable)]
    public async Task<ActionResult<AuthenticatedUserDto>> LoginWithWechatWeb(
        [FromBody] OAuthCodeDto request,
        CancellationToken cancellationToken)
    {
        var result = await authService.LoginWithWechatWebAsync(
            new WechatLoginRequest(
                await ResolveTenantIdAsync(request.TenantCode, cancellationToken),
                request.Code,
                GetIpAddress(),
                Request.Headers.UserAgent.ToString()),
            cancellationToken);

        return Ok(AuthenticatedUserDto.FromApplication(result));
    }

    [AllowAnonymous]
    [HttpPost("oauth/wechat-miniapp")]
    [EndpointSummary("微信小程序登录")]
    [EndpointDescription("使用小程序 wx.login 返回的 code 换取 openid/session_key，upsert 用户身份并创建应用会话。")]
    [ProducesResponseType<AuthenticatedUserDto>(StatusCodes.Status200OK)]
    [ProducesResponseType<ProblemDetails>(StatusCodes.Status401Unauthorized)]
    [ProducesResponseType<ProblemDetails>(StatusCodes.Status503ServiceUnavailable)]
    public async Task<ActionResult<AuthenticatedUserDto>> LoginWithWechatMiniApp(
        [FromBody] OAuthCodeDto request,
        CancellationToken cancellationToken)
    {
        var result = await authService.LoginWithWechatMiniAppAsync(
            new WechatLoginRequest(
                await ResolveTenantIdAsync(request.TenantCode, cancellationToken),
                request.Code,
                GetIpAddress(),
                Request.Headers.UserAgent.ToString()),
            cancellationToken);

        return Ok(AuthenticatedUserDto.FromApplication(result));
    }

    [AllowAnonymous]
    [HttpPost("refresh")]
    [EndpointSummary("刷新登录会话")]
    [EndpointDescription("使用 refresh token 轮换数据库 session，并签发新的 access/refresh token。")]
    public async Task<ActionResult<AuthTokenPair>> Refresh(
        [FromBody] RefreshSessionDto request,
        CancellationToken cancellationToken)
    {
        ResolveRefreshTokenTenant(request.RefreshToken);
        var result = await authService.RefreshAsync(
            new RefreshSessionRequest(
                request.RefreshToken,
                GetIpAddress(),
                Request.Headers.UserAgent.ToString()),
            cancellationToken);

        return Ok(result);
    }

    [AllowAnonymous]
    [HttpPost("logout")]
    [EndpointSummary("退出登录")]
    [EndpointDescription("撤销 refresh token 对应的数据库 session；session 校验开启时，旧 access token 也会被拒绝。")]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    public async Task<IActionResult> Logout(
        [FromBody] RefreshSessionDto request,
        CancellationToken cancellationToken)
    {
        ResolveRefreshTokenTenant(request.RefreshToken);
        await authService.LogoutAsync(
            new LogoutSessionRequest(request.RefreshToken),
            cancellationToken);

        return NoContent();
    }

    private void ResolveRefreshTokenTenant(string refreshToken)
    {
        if (!sessionService.TryParseRefreshToken(refreshToken, out var locator))
        {
            return;
        }

        tenantContextInitializer.Initialize(locator.TenantId, null, TenantResolutionSource.RefreshToken);
    }

    private string? GetIpAddress()
    {
        return HttpContext.Connection.RemoteIpAddress?.ToString();
    }

    private async Task<Guid> ResolveTenantIdAsync(string? tenantCode, CancellationToken cancellationToken)
    {
        if (tenantContext.TenantId.HasValue)
        {
            if (!string.IsNullOrWhiteSpace(tenantCode) &&
                !string.Equals(tenantContext.TenantCode, tenantCode.Trim(), StringComparison.OrdinalIgnoreCase))
            {
                var supplied = await tenantDirectory.FindByCodeAsync(tenantCode.Trim(), cancellationToken);
                if (supplied?.TenantId != tenantContext.TenantId.Value)
                {
                    throw new TenantContextConflictException(
                        tenantContext.TenantId.Value,
                        supplied?.TenantId ?? Guid.Empty);
                }
            }

            return tenantContext.TenantId.Value;
        }

        if (string.IsNullOrWhiteSpace(tenantCode))
        {
            throw new RequiredFieldException("tenantCode is required when the request host does not resolve a tenant.");
        }

        var tenant = await tenantDirectory.FindByCodeAsync(tenantCode.Trim(), cancellationToken)
            ?? throw new TenantNotFoundException();
        tenantContextInitializer.Initialize(
            tenant.TenantId,
            tenant.TenantCode,
            TenantResolutionSource.TenantCode);
        return tenant.TenantId;
    }
}