package httpapi

import (
	"net/http"
	"strings"
	"time"

	"scout/internal/access"
	"scout/internal/users"
)

func (s *Server) requireProjectAccess(writer http.ResponseWriter, request *http.Request, projectID, required string) bool {
	if s.Access == nil || !s.Access.HasAccessControl(projectID) {
		if required == access.RoleViewer {
			return true
		}
		if _, ok := s.uploadUser(request); ok {
			return true
		}
		if _, loggedIn := s.authenticatedUser(request); loggedIn {
			writeError(writer, http.StatusForbidden, "需要项目开发者或管理员权限")
		} else {
			writeError(writer, http.StatusUnauthorized, "请先登录项目开发者账户")
		}
		return false
	}
	if user, ok := s.authenticatedUser(request); ok && user.Role == users.RoleAdmin {
		return true
	}
	if tokenValue := projectTokenValue(request); tokenValue != "" {
		if token, ok := s.Access.AuthenticateToken(projectID, tokenValue); ok {
			if access.Allows(token.Role, required) {
				return true
			}
			writeError(writer, http.StatusForbidden, "项目令牌权限不足")
			return false
		}
	}
	if user, ok := s.authenticatedUser(request); ok {
		member, memberOK := s.Access.GetMember(projectID, user.ID)
		if memberOK && access.Allows(member.Role, required) {
			return true
		}
		writeError(writer, http.StatusForbidden, "没有执行此项目操作的权限")
		return false
	}
	writeError(writer, http.StatusUnauthorized, "请先登录或提供项目令牌")
	return false
}

func (s *Server) projectUploadUser(request *http.Request, projectID string) (users.User, bool) {
	if s.Access != nil {
		if tokenValue := projectTokenValue(request); tokenValue != "" {
			if token, ok := s.Access.AuthenticateToken(projectID, tokenValue); ok && access.Allows(token.Role, access.RoleDeveloper) {
				return users.User{
					ID:     "project-token:" + token.ID,
					Name:   "项目令牌",
					Role:   users.RoleDeveloper,
					Active: true,
				}, true
			}
		}
	}
	if user, ok := s.authenticatedUser(request); ok {
		if user.Role == users.RoleAdmin {
			return user, true
		}
		if s.Access != nil {
			if member, memberOK := s.Access.GetMember(projectID, user.ID); memberOK && access.Allows(member.Role, access.RoleDeveloper) {
				return user, true
			}
		}
	}
	return s.uploadUser(request)
}

func projectTokenValue(request *http.Request) string {
	if value := strings.TrimSpace(request.Header.Get("X-Project-Token")); value != "" {
		return value
	}
	value := strings.TrimSpace(request.Header.Get("Authorization"))
	if strings.HasPrefix(value, "Bearer ") {
		return strings.TrimSpace(strings.TrimPrefix(value, "Bearer "))
	}
	return ""
}

func (s *Server) requireProjectAdmin(writer http.ResponseWriter, request *http.Request, projectID string) bool {
	if s.Access == nil || !s.Access.HasAccessControl(projectID) {
		return s.requireRole(writer, request, users.RoleAdmin)
	}
	if user, ok := s.authenticatedUser(request); ok && user.Role == users.RoleAdmin {
		return true
	}
	if user, ok := s.authenticatedUser(request); ok {
		member, memberOK := s.Access.GetMember(projectID, user.ID)
		if memberOK && member.Role == access.RoleAdmin {
			return true
		}
		writeError(writer, http.StatusForbidden, "没有管理此项目的权限")
		return false
	}
	writeError(writer, http.StatusUnauthorized, "请先登录项目管理员账户")
	return false
}

func (s *Server) projectMembersRoute(writer http.ResponseWriter, request *http.Request, projectID string, rest []string) {
	if s.Access == nil {
		writeError(writer, http.StatusServiceUnavailable, "项目权限管理尚未启用")
		return
	}
	if !s.requireProjectAdmin(writer, request, projectID) {
		return
	}
	if len(rest) == 0 && request.Method == http.MethodGet {
		writeJSON(writer, http.StatusOK, map[string]any{"members": s.Access.ListMembers(projectID)})
		return
	}
	if len(rest) == 0 && request.Method == http.MethodPost {
		var input struct {
			UserID string `json:"user_id"`
			Role   string `json:"role"`
		}
		if err := decodeJSON(request, &input); err != nil {
			writeError(writer, http.StatusBadRequest, err.Error())
			return
		}
		if s.Users == nil {
			writeError(writer, http.StatusServiceUnavailable, "用户管理尚未启用")
			return
		}
		if _, ok := s.Users.Get(strings.TrimSpace(input.UserID)); !ok {
			writeError(writer, http.StatusNotFound, "用户不存在")
			return
		}
		member, err := s.Access.AddMember(projectID, input.UserID, input.Role)
		if err != nil {
			status := http.StatusBadRequest
			if strings.Contains(err.Error(), "已经存在") {
				status = http.StatusConflict
			}
			writeError(writer, status, err.Error())
			return
		}
		writeJSON(writer, http.StatusCreated, member)
		return
	}
	if len(rest) == 1 && request.Method == http.MethodPatch {
		var input struct {
			Role string `json:"role"`
		}
		if err := decodeJSON(request, &input); err != nil {
			writeError(writer, http.StatusBadRequest, err.Error())
			return
		}
		member, err := s.Access.UpdateMember(projectID, rest[0], input.Role)
		if err != nil {
			writeError(writer, http.StatusBadRequest, err.Error())
			return
		}
		writeJSON(writer, http.StatusOK, member)
		return
	}
	if len(rest) == 1 && request.Method == http.MethodDelete {
		if err := s.Access.DeleteMember(projectID, rest[0]); err != nil {
			writeError(writer, http.StatusNotFound, err.Error())
			return
		}
		writer.WriteHeader(http.StatusNoContent)
		return
	}
	writeError(writer, http.StatusNotFound, "接口不存在")
}

func (s *Server) projectTokensRoute(writer http.ResponseWriter, request *http.Request, projectID string, rest []string) {
	if s.Access == nil {
		writeError(writer, http.StatusServiceUnavailable, "项目权限管理尚未启用")
		return
	}
	if !s.requireProjectAdmin(writer, request, projectID) {
		return
	}
	if len(rest) == 0 && request.Method == http.MethodGet {
		writeJSON(writer, http.StatusOK, map[string]any{"tokens": s.Access.ListTokens(projectID)})
		return
	}
	if len(rest) == 0 && request.Method == http.MethodPost {
		var input struct {
			Name      string `json:"name"`
			Role      string `json:"role"`
			ExpiresAt string `json:"expires_at"`
		}
		if err := decodeJSON(request, &input); err != nil {
			writeError(writer, http.StatusBadRequest, err.Error())
			return
		}
		role := strings.TrimSpace(input.Role)
		if role == "" {
			role = access.RoleViewer
		}
		var expiresAt *time.Time
		if strings.TrimSpace(input.ExpiresAt) != "" {
			parsed, err := time.Parse(time.RFC3339, strings.TrimSpace(input.ExpiresAt))
			if err != nil || !parsed.After(time.Now().UTC()) {
				writeError(writer, http.StatusBadRequest, "令牌过期时间必须是未来的 RFC3339 时间")
				return
			}
			expiresAt = &parsed
		}
		token, secret, err := s.Access.CreateToken(projectID, input.Name, role, expiresAt)
		if err != nil {
			writeError(writer, http.StatusBadRequest, err.Error())
			return
		}
		writeJSON(writer, http.StatusCreated, map[string]any{"token": token, "secret": secret})
		return
	}
	if len(rest) == 2 && rest[1] == "revoke" && request.Method == http.MethodPost {
		token, err := s.Access.RevokeToken(projectID, rest[0])
		if err != nil {
			writeError(writer, http.StatusNotFound, err.Error())
			return
		}
		writeJSON(writer, http.StatusOK, token)
		return
	}
	writeError(writer, http.StatusNotFound, "接口不存在")
}