package com.mydreamjob.controller;

import com.mydreamjob.auth.AuthService;
import com.mydreamjob.auth.AuthSessionService;
import com.mydreamjob.auth.InvalidTokenException;
import com.mydreamjob.auth.LoginRequest;
import com.mydreamjob.auth.SmsVerificationService;
import com.mydreamjob.auth.dto.RefreshTokenRequest;
import com.mydreamjob.auth.dto.TokenPairResponse;
import com.mydreamjob.common.api.ApiResponse;
import com.mydreamjob.common.exception.BusinessException;
import com.mydreamjob.common.exception.ErrorCode;
import com.mydreamjob.security.CurrentUserAccessor;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.validation.ConstraintViolationException;
import jakarta.validation.Valid;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.Pattern;
import lombok.RequiredArgsConstructor;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

/**
 * 认证相关接口
 *
 * <p>S02：新增 {@code /auth/refresh} 与 {@code /auth/logout}。Controller 只做参数接收、
 * 身份解析和响应包装，不计算摘要、不解析 JWT、不访问 Repository，也不重复实现会话逻辑。</p>
 */
@Tag(name = "认证", description = "登录、验证码、Token 刷新与登出、用户信息")
@RestController
@RequestMapping("/auth")
@RequiredArgsConstructor
@Validated
public class AuthController {

    private final AuthService authService;
    private final SmsVerificationService smsVerificationService;
    private final CurrentUserAccessor currentUserAccessor;

    @Operation(summary = "发送短信验证码", description = "开发/测试使用 Mock 发送实现；生产环境未接入短信网关时返回服务不可用。验证码不会写入日志。")
    @PostMapping("/sms/send")
    public ResponseEntity<ApiResponse<Map<String, String>>> sendSmsCode(
            @RequestParam @NotBlank(message = "phone is required")
            @Pattern(regexp = "[0-9]{11}", message = "phone must contain exactly 11 digits") String phone,
            @RequestParam(defaultValue = "login") String purpose,
            HttpServletRequest request) {
        try {
            smsVerificationService.sendCode(phone, purpose,
                    getRequestId(request),
                    request.getRemoteAddr(),
                    request.getHeader("User-Agent"));
            return ResponseEntity.ok(ApiResponse.ok(
                    Map.of("message", "验证码已发送（Mock）"),
                    getRequestId(request)));
        } catch (ConstraintViolationException e) {
            return ResponseEntity.badRequest().body(
                    ApiResponse.badRequest(e.getMessage(), getRequestId(request)));
        } catch (Exception e) {
            return ResponseEntity.badRequest().body(
                    ApiResponse.error(400, e.getMessage(), getRequestId(request)));
        }
    }

    @Operation(summary = "Mock 登录", description = "使用手机号+验证码登录，返回 Access/Refresh Token 并创建服务端登录会话")
    @PostMapping("/login")
    public ResponseEntity<ApiResponse<Map<String, Object>>> mockLogin(
            @Valid @RequestBody LoginRequest body,
            HttpServletRequest request) {
        String phone = body.getPhone();
        String code = body.getCode();
        String purpose = body.getPurpose() == null || body.getPurpose().isBlank()
                ? "login" : body.getPurpose();
        try {
            Map<String, Object> result = authService.mockLogin(phone, code, purpose,
                    getRequestId(request),
                    request.getRemoteAddr(),
                    request.getHeader("User-Agent"));
            return ResponseEntity.ok(ApiResponse.ok(result, getRequestId(request)));
        } catch (BusinessException e) {
            // 已注销手机号：保留 HTTP 409 / 业务 code=9303，交由全局异常处理器映射。
            // 其余业务异常（如验证码错误、参数校验）维持既有 400/code=400 行为。
            if (e.getErrorCodeInt() == ErrorCode.ACCOUNT_DELETED.getCode()) {
                throw e;
            }
            return ResponseEntity.badRequest().body(
                    ApiResponse.error(400, e.getMessage(), getRequestId(request)));
        } catch (Exception e) {
            return ResponseEntity.badRequest().body(
                    ApiResponse.error(400, e.getMessage(), getRequestId(request)));
        }
    }

    @Operation(summary = "刷新 Token",
            description = "使用 Refresh Token 换取新的 Access/Refresh Token 对；旧 Refresh Token 立即失效")
    @PostMapping("/refresh")
    public ResponseEntity<ApiResponse<TokenPairResponse>> refresh(
            @Valid @RequestBody RefreshTokenRequest body,
            HttpServletRequest request) {
        try {
            AuthSessionService.SessionTokens tokens = authService.refresh(
                    body.getRefreshToken(),
                    getRequestId(request),
                    request.getRemoteAddr(),
                    request.getHeader("User-Agent"));
            return ResponseEntity.ok(ApiResponse.ok(
                    new TokenPairResponse(tokens.accessToken(), tokens.refreshToken(),
                            AuthService.EXPIRES_IN_SECONDS),
                    getRequestId(request)));
        } catch (InvalidTokenException e) {
            // 统一 401：不说明 Token 不存在、已消费、已撤销还是重放，也不回显任何 Token。
            return unauthorized(request);
        }
    }

    @Operation(summary = "登出",
            description = "撤销当前登录会话；需要 Access Token，不接受任何请求体")
    @PostMapping("/logout")
    public ResponseEntity<ApiResponse<Map<String, String>>> logout(HttpServletRequest request) {
        // 身份与会话一律来自通过校验的 Access Token，不接受客户端传入 userId/sessionId。
        Long userId = currentUserAccessor.requireUserId();
        String sessionId = currentUserAccessor.requireSessionId();
        authService.logout(userId, sessionId,
                getRequestId(request),
                request.getRemoteAddr(),
                request.getHeader("User-Agent"));
        return ResponseEntity.ok(ApiResponse.ok(
                Map.of("message", "logged out"), getRequestId(request)));
    }

    @Operation(summary = "当前用户信息", description = "需要 JWT 认证")
    @GetMapping("/me")
    public ResponseEntity<ApiResponse<Map<String, Object>>> me(HttpServletRequest request) {
        Long userId = currentUserAccessor.requireUserId();
        return ResponseEntity.ok(ApiResponse.ok(authService.getCurrentUser(userId), getRequestId(request)));
    }

    private ResponseEntity<ApiResponse<TokenPairResponse>> unauthorized(HttpServletRequest request) {
        return ResponseEntity.status(401).body(
                ApiResponse.unauthorized("invalid or expired token", getRequestId(request)));
    }

    private String getRequestId(HttpServletRequest request) {
        return request.getHeader("X-Request-Id");
    }
}