package com.mydreamjob.job;

import com.mydreamjob.common.api.ApiResponse;
import com.mydreamjob.common.exception.BusinessException;
import com.mydreamjob.common.exception.ErrorCode;
import com.mydreamjob.company.Company;
import com.mydreamjob.company.CompanyService;
import com.mydreamjob.job.dto.JobCreateRequest;
import com.mydreamjob.job.dto.JobSearchItem;
import com.mydreamjob.job.dto.JobStatusRequest;
import com.mydreamjob.job.dto.JobUpdateRequest;
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.Valid;
import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.Page;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;

/**
 * 岗位管理接口
 * 企业端：创建、编辑、状态流转（需 JWT + 企业归属校验）
 * 公开端：岗位列表、详情（无需认证）
 */
@Tag(name = "岗位", description = "岗位创建、管理、查询")
@RestController
@RequestMapping("/jobs")
@RequiredArgsConstructor
public class JobController {
    /** R01-A6：requestId 只来自过滤器规范化后的唯一产出点。 */
    private final com.mydreamjob.common.logging.RequestIdAccessor requestIdAccessor;

    private final JobService jobService;
    private final CompanyService companyService;
    private final CurrentUserAccessor currentUserAccessor;

    // ── 企业端：创建岗位 ────────────────────────────────────────

    @Operation(summary = "创建岗位", description = "仅企业账号可调用，新岗位默认 DRAFT 状态")
    @PostMapping
    public ResponseEntity<ApiResponse<Map<String, Object>>> createJob(
            @Valid @RequestBody JobCreateRequest req,
            HttpServletRequest request) {
        Long companyId = resolveCompanyId();
        Map<String, Object> view = jobService.toView(jobService.createJob(companyId, req));
        return ResponseEntity.ok(ApiResponse.ok(view, requestIdAccessor.get(request)));
    }

    // ── 企业端：编辑岗位 ────────────────────────────────────────

    @Operation(summary = "更新岗位", description = "仅岗位所属企业可修改")
    @PutMapping("/{jobId}")
    public ResponseEntity<ApiResponse<Map<String, Object>>> updateJob(
            @PathVariable Long jobId,
            @Valid @RequestBody JobUpdateRequest req,
            HttpServletRequest request) {
        Long companyId = resolveCompanyId();
        Map<String, Object> view = jobService.toView(jobService.updateJob(companyId, jobId, req));
        return ResponseEntity.ok(ApiResponse.ok(view, requestIdAccessor.get(request)));
    }

    // ── 企业端：状态流转 ────────────────────────────────────────

    @Operation(summary = "发布/关闭岗位", description = "DRAFT→PUBLISHED，PUBLISHED→CLOSED；禁止非法回退")
    @PatchMapping("/{jobId}/status")
    public ResponseEntity<ApiResponse<Map<String, Object>>> updateStatus(
            @PathVariable Long jobId,
            @Valid @RequestBody JobStatusRequest req,
            HttpServletRequest request) {
        Long companyId = resolveCompanyId();
        Map<String, Object> view = jobService.toView(jobService.transitionStatus(companyId, jobId, req));
        return ResponseEntity.ok(ApiResponse.ok(view, requestIdAccessor.get(request)));
    }

    // ── 企业端：查询岗位详情 ────────────────────────────────────

    @Operation(summary = "查询岗位详情", description = "企业可查看自己管理的岗位详情")
    @GetMapping("/{jobId}")
    public ResponseEntity<ApiResponse<Map<String, Object>>> getJob(
            @PathVariable Long jobId,
            HttpServletRequest request) {
        Long companyId = resolveCompanyId();
        Map<String, Object> view = jobService.toView(jobService.getCompanyJob(companyId, jobId));
        return ResponseEntity.ok(ApiResponse.ok(view, requestIdAccessor.get(request)));
    }

    // ── 公开端：岗位列表 ────────────────────────────────────────

    @Operation(summary = "查询已发布岗位列表", description = "仅返回 PUBLISHED 岗位，支持关键词、城市、用工类型、薪资筛选和分页")
    @GetMapping
    public ResponseEntity<ApiResponse<Map<String, Object>>> listJobs(
            @RequestParam(required = false) String keyword,
            @RequestParam(required = false) String city,
            @RequestParam(required = false) String employmentType,
            @RequestParam(required = false) Integer salaryMin,
            @RequestParam(required = false) Integer salaryMax,
            @RequestParam(defaultValue = "0") int page,
            @RequestParam(defaultValue = "20") int size,
            HttpServletRequest request) {
        if (size > 50) size = 50;
        Page<Map<String, Object>> result =
                jobService.listPublishedJobs(keyword, city, employmentType,
                        salaryMin, salaryMax, page, size);
        Map<String, Object> data = new HashMap<>();
        data.put("items", result.getContent());
        data.put("total", result.getTotalElements());
        data.put("page", result.getNumber());
        data.put("size", result.getSize());
        data.put("totalPages", result.getTotalPages());
        return ResponseEntity.ok(ApiResponse.ok(data, requestIdAccessor.get(request)));
    }

    // ── 公开端：岗位详情 ────────────────────────────────────────

    @Operation(summary = "查询岗位详情（公开）", description = "仅返回 PUBLISHED 岗位详情；CLOSED 也可查看详情")
    @GetMapping("/public/{jobId}")
    public ResponseEntity<ApiResponse<Map<String, Object>>> getPublicJob(
            @PathVariable Long jobId,
            HttpServletRequest request) {
        Map<String, Object> view = jobService.getPublicJob(jobId);
        return ResponseEntity.ok(ApiResponse.ok(view, requestIdAccessor.get(request)));
    }

    // ── 公开端：高级搜索 ────────────────────────────────────────

    @Operation(summary = "岗位高级搜索", description = "仅返回 PUBLISHED 岗位，支持关键词、城市、用工类型、薪资、公司筛选、排序和分页")
    @GetMapping("/search")
    public ResponseEntity<ApiResponse<Map<String, Object>>> searchJobs(
            @RequestParam(required = false) String keyword,
            @RequestParam(required = false) String city,
            @RequestParam(required = false) String employmentType,
            @RequestParam(required = false) Integer salaryMin,
            @RequestParam(required = false) Integer salaryMax,
            @RequestParam(required = false) Long companyId,
            @RequestParam(required = false) String sort,
            @RequestParam(defaultValue = "0") int page,
            @RequestParam(defaultValue = "20") int size,
            HttpServletRequest request) {
        Page<JobSearchItem> result = jobService.searchJobs(
                keyword, city, employmentType, salaryMin, salaryMax, companyId,
                sort, page, size);
        Map<String, Object> data = new HashMap<>();
        data.put("items", result.getContent());
        data.put("total", result.getTotalElements());
        data.put("page", result.getNumber());
        data.put("size", result.getSize());
        data.put("totalPages", result.getTotalPages());
        return ResponseEntity.ok(ApiResponse.ok(data, requestIdAccessor.get(request)));
    }

    // ── 公开端：筛选选项 ────────────────────────────────────────

    @Operation(summary = "岗位筛选选项", description = "返回当前 PUBLISHED 岗位可用的城市、用工类型和薪资范围")
    @GetMapping("/filters")
    public ResponseEntity<ApiResponse<Map<String, Object>>> getFilters(
            HttpServletRequest request) {
        Map<String, Object> options = jobService.getFilterOptions();
        return ResponseEntity.ok(ApiResponse.ok(options, requestIdAccessor.get(request)));
    }

    // ── 辅助方法 ────────────────────────────────────────────────

    private Long resolveCompanyId() {
        // 身份只来自 JWT/SecurityContext；非法主体统一为未登录语义（401），不抛 NumberFormatException
        Long userId = currentUserAccessor.requireUserId();
        Company company = companyService.findCompanyByOwnerUserId(userId);
        if (company == null) {
            throw new BusinessException(ErrorCode.COMPANY_NOT_FOUND);
        }
        return company.getId();
    }

}