package middleware

import (
	"net/http"
	"regexp"

	"ezops/model"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// PipelineAccess 流水线权限中间件
// 路由参数 :code（流水线编码）→ 查找 pipeline → 注入 pipelineID 到 context
// 权限检查顺序：管理员 → 直接成员 → 用户组 → Item Role (regex)
func PipelineAccess(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		// 1) 解析 code → 查找流水线（所有用户都需要）
		code := c.Param("code")
		if code == "" {
			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"code": 400, "message": "缺少流水线编码"})
			return
		}

		var pipeline model.Pipeline
		if err := db.Where("code = ?", code).First(&pipeline).Error; err != nil {
			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"code": 404, "message": "流水线不存在"})
			return
		}

		// 注入 context，后续 handlers 统一从这里读
		c.Set("pipelineID", pipeline.ID)
		c.Set("pipelineCode", code)

		// 2) 管理员直接放行（跳过权限检查）
		if isAdmin, _ := c.Get("isAdmin"); isAdmin == true {
			c.Next()
			return
		}

		username, _ := c.Get("username")
		usernameStr, _ := username.(string)
		if usernameStr == "" {
			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"code": 401, "message": "未认证"})
			return
		}

		pipelineID := pipeline.ID

		// 3) 检查是否直接是流水线成员
		var directCount int64
		db.Model(&model.DeployPipelineMember{}).
			Where("pipeline_id = ? AND username = ?", pipelineID, usernameStr).
			Count(&directCount)
		if directCount > 0 {
			c.Next()
			return
		}

		// 4) 检查是否属于授权给该流水线的用户组
		var groupCount int64
		db.Table("deploy_pipeline_members").
			Joins("JOIN deploy_user_group_members ON deploy_user_group_members.group_id = deploy_pipeline_members.group_id").
			Where("deploy_pipeline_members.pipeline_id = ? AND deploy_user_group_members.username = ?", pipelineID, usernameStr).
			Count(&groupCount)
		if groupCount > 0 {
			c.Next()
			return
		}

		// 5) Jenkins-style Item Role — regex pattern matching on pipeline code
		var itemRoles []model.ItemRole
		db.Table("iam_item_roles").
			Joins("JOIN iam_user_item_roles ON iam_user_item_roles.item_role_id = iam_item_roles.id").
			Where("iam_item_roles.status = 1 AND iam_user_item_roles.user_id = ?",
				func() uint { uid, _ := c.Get("userID"); return uid.(uint) }()).
			Find(&itemRoles)
		for _, ir := range itemRoles {
			if matched, _ := regexp.MatchString(ir.Pattern, code); matched {
				c.Next()
				return
			}
		}

		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{
			"code":    403,
			"message": "无权访问此流水线，请联系流水线 Owner 添加你为成员",
		})
	}
}

// GetAccessiblePipelineIDs 获取当前用户有权访问的流水线 ID 列表
// 包括：直接成员 + 用户组 + Item Role (regex)
func GetAccessiblePipelineIDs(db *gorm.DB, username string, userID uint) ([]uint, bool) {
	var directIDs []uint
	db.Model(&model.DeployPipelineMember{}).
		Where("username = ?", username).
		Pluck("pipeline_id", &directIDs)

	var groupIDs []uint
	db.Model(&model.DeployPipelineMember{}).
		Joins("JOIN deploy_user_group_members ON deploy_user_group_members.group_id = deploy_pipeline_members.group_id").
		Where("deploy_user_group_members.username = ?", username).
		Pluck("deploy_pipeline_members.pipeline_id", &groupIDs)

	idSet := make(map[uint]bool)
	for _, id := range directIDs {
		idSet[id] = true
	}
	for _, id := range groupIDs {
		idSet[id] = true
	}

	// Item Role regex matching: get all item roles for user, match against pipeline codes
	var itemRoles []model.ItemRole
	db.Table("iam_item_roles").
		Joins("JOIN iam_user_item_roles ON iam_user_item_roles.item_role_id = iam_item_roles.id").
		Where("iam_item_roles.status = 1 AND iam_user_item_roles.user_id = ?", userID).
		Find(&itemRoles)
	if len(itemRoles) > 0 {
		var allPipelines []model.Pipeline
		db.Find(&allPipelines)
		for _, p := range allPipelines {
			for _, ir := range itemRoles {
				if matched, _ := regexp.MatchString(ir.Pattern, p.Code); matched {
					idSet[p.ID] = true
					break
				}
			}
		}
	}

	ids := make([]uint, 0, len(idSet))
	for id := range idSet {
		ids = append(ids, id)
	}

	return ids, len(ids) > 0
}