package middleware

import (
	"net/http"
	"regexp"
	"strconv"

	"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
		}

		if authorizePipelineAccess(c, db, &pipeline) {
			c.Next()
		}
	}
}

// PipelineRunAccess 通过运行记录反查流水线并校验访问权限，防止按 runId 越权读取日志或工作区。 // Logan.Li
func PipelineRunAccess(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		runID, err := strconv.ParseUint(c.Param("runId"), 10, 32)
		if err != nil {
			c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"code": 400, "message": "无效的运行记录 ID"})
			return
		}

		var run model.PipelineRun
		if err := db.Select("id", "pipeline_id").Take(&run, uint(runID)).Error; err != nil {
			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"code": 404, "message": "流水线运行记录不存在"})
			return
		}
		var pipeline model.Pipeline
		if err := db.Take(&pipeline, run.PipelineID).Error; err != nil {
			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"code": 404, "message": "关联流水线不存在"})
			return
		}
		if authorizePipelineAccess(c, db, &pipeline) {
			c.Next()
		}
	}
}

// authorizePipelineAccess 集中复用流水线成员、用户组与 Item Role 授权规则。 // Logan.Li
func authorizePipelineAccess(c *gin.Context, db *gorm.DB, pipeline *model.Pipeline) bool {
	c.Set("pipelineID", pipeline.ID)
	c.Set("pipelineCode", pipeline.Code)
	if isAdmin, _ := c.Get("isAdmin"); isAdmin == true {
		return true
	}
	username, _ := c.Get("username")
	usernameStr, _ := username.(string)
	userID, _ := c.Get("userID")
	userIDUint, ok := userID.(uint)
	if usernameStr == "" || !ok {
		c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"code": 401, "message": "未认证"})
		return false
	}

	var directCount int64
	db.Model(&model.DeployPipelineMember{}).Where("pipeline_id = ? AND username = ?", pipeline.ID, usernameStr).Count(&directCount)
	if directCount > 0 {
		return true
	}
	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 = ?", pipeline.ID, usernameStr).Count(&groupCount)
	if groupCount > 0 {
		return true
	}

	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 = ?", userIDUint).Find(&itemRoles)
	for _, ir := range itemRoles {
		if pipelineMatchesItemRole(*pipeline, ir.Pattern) {
			return true
		}
	}
	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"})
	return false
}

// 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 pipelineMatchesItemRole(p, ir.Pattern) {
					idSet[p.ID] = true
					break
				}
			}
		}
	}

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

	return ids, len(ids) > 0
}

// pipelineMatchesItemRole 正则匹配流水线 code 或 Job 名称（Webhook Job） // Logan.Li
func pipelineMatchesItemRole(p model.Pipeline, pattern string) bool {
	if pattern == "" {
		return false
	}
	if matched, err := regexp.MatchString(pattern, p.Code); err == nil && matched {
		return true
	}
	if p.JobName != "" {
		if matched, err := regexp.MatchString(pattern, p.JobName); err == nil && matched {
			return true
		}
	}
	return false
}