// ===========================================
// 多班级版班级管理系统 - Go 后端
//
// 开发者: Canglan
// 联系方式: admin@sea-studio.top
// 版权归属: Sea Network Technology Studio
// 许可证: Apache License 2.0
//
// 版权所有 © Sea Network Technology Studio
// ===========================================

package handler

import (
	"strconv"

	"github.com/gin-gonic/gin"

	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/middleware"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/repository"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/schema"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/internal/service"
	"hz-gitea.sea-studio.top/canglan/SharedClassManager/pkg/response"
)

// StudentHandler 学生端处理器
type StudentHandler struct {
	studentService *service.StudentService
	classRepo      *repository.ClassRepo
}

// NewStudentHandler 创建学生端处理器
func NewStudentHandler(studentService *service.StudentService, classRepo *repository.ClassRepo) *StudentHandler {
	return &StudentHandler{studentService: studentService, classRepo: classRepo}
}

// Dashboard 学生个人信息（仪表盘）
func (h *StudentHandler) Dashboard(c *gin.Context) {
	studentID := middleware.GetStudentID(c)
	if studentID == 0 {
		response.BadRequest(c, "非学生用户")
		return
	}

	result, err := h.studentService.GetStudentInfo(studentID)
	if err != nil {
		response.InternalError(c, err.Error())
		return
	}
	response.Success(c, result, "操作成功")
}

// resolveStudentID 校验学生归属：学生只能查看自己的数据，家长只能查看关联子女，管理员可查看指定学生
func (h *StudentHandler) resolveStudentID(c *gin.Context) (int, bool) {
	userType := middleware.GetUserType(c)
	if userType == "student" {
		// 学生只能查看自己的数据，忽略 URL 参数中的 student_id
		studentID := middleware.GetStudentID(c)
		if studentID == 0 {
			response.BadRequest(c, "非学生用户")
			return 0, false
		}
		return studentID, true
	}

	requestedID, ok := parseID(c, "student_id")
	if !ok {
		return 0, false
	}

	// 家长只能查看自己关联的子女数据
	if userType == "parent" {
		parentStudentID := middleware.GetStudentID(c)
		if parentStudentID == 0 || parentStudentID != requestedID {
			response.Forbidden(c, "无权访问该学生数据")
			return 0, false
		}
		return requestedID, true
	}

	// 管理员/超级管理员允许查看（角色权限由路由中间件 RequireRole 控制）
	return requestedID, true
}

// ConductHistory 学生操行分历史
func (h *StudentHandler) ConductHistory(c *gin.Context) {
	studentID, ok := h.resolveStudentID(c)
	if !ok {
		return
	}

	var query schema.StudentConductQuery
	if err := c.ShouldBindQuery(&query); err != nil {
		response.BadRequest(c, "参数错误")
		return
	}

	result, err := h.studentService.GetConductHistory(studentID, query.Limit, query.Offset)
	if err != nil {
		response.InternalError(c, err.Error())
		return
	}
	response.Success(c, result, "操作成功")
}

// Homework 学生作业情况
func (h *StudentHandler) Homework(c *gin.Context) {
	studentID, ok := h.resolveStudentID(c)
	if !ok {
		return
	}

	result, err := h.studentService.GetHomeworkStatus(studentID)
	if err != nil {
		response.InternalError(c, err.Error())
		return
	}
	response.Success(c, result, "操作成功")
}

// Attendance 学生考勤记录
func (h *StudentHandler) Attendance(c *gin.Context) {
	studentID, ok := h.resolveStudentID(c)
	if !ok {
		return
	}

	month := c.Query("month")
	result, err := h.studentService.GetAttendanceRecords(studentID, month)
	if err != nil {
		response.InternalError(c, err.Error())
		return
	}
	response.Success(c, result, "操作成功")
}

// Ranking 操行分排行
func (h *StudentHandler) Ranking(c *gin.Context) {
	classID := middleware.GetClassID(c)

	// 检查班级功能开关：学生查看排行榜
	feature, err := h.classRepo.GetFeature(classID, "student_view_ranking")
	if err == nil && feature != nil && feature.Enabled == 0 {
		response.Forbidden(c, "该功能暂未开放")
		return
	}
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "50"))
	if limit <= 0 {
		limit = 50
	}
	if limit > 500 {
		limit = 500
	}

	result, err := h.studentService.GetRanking(classID, limit)
	if err != nil {
		response.InternalError(c, err.Error())
		return
	}
	response.Success(c, result, "操作成功")
}

// MyInfo 学生个人信息
func (h *StudentHandler) MyInfo(c *gin.Context) {
	studentID := middleware.GetStudentID(c)
	if studentID == 0 {
		response.BadRequest(c, "非学生用户")
		return
	}

	result, err := h.studentService.GetStudentInfo(studentID)
	if err != nil {
		response.InternalError(c, err.Error())
		return
	}
	response.Success(c, result, "操作成功")
}

// SemesterRecords 学期归档记录
func (h *StudentHandler) SemesterRecords(c *gin.Context) {
	studentID := middleware.GetStudentID(c)
	if studentID <= 0 {
		response.BadRequest(c, "非学生用户")
		return
	}
	result, err := h.studentService.GetSemesterRecords(studentID)
	if err != nil {
		response.InternalError(c, err.Error())
		return
	}
	response.Success(c, result, "操作成功")
}